KR20060099117A - Tilt controlling device in optical recorder or player, and controlling method - Google Patents

Abstract

A tilt error generator for generating a tilt error signal from a signal received from the optical pickup; A tilt controller which receives the tilt error signal, the focus actuator driving signal and the position information of the disk and generates a control signal for compensating the tilt according to a type; And a tilt control device according to the position of the disc in the optical recorder and player including a tilt driver for driving the pickup according to the control signal to perform tilt control.

Categorizing the type of disk according to the type of bending of the optical disk; Determining the type of optical disc to measure; And performing tilt compensation according to the determined type of the optical disk, and a tilt compensation method for each disc position of the optical recorder and player.

Tilt compensation

Description

Tilt Controlling Device in Optical Recorder or Player, and Controlling Method

Figure 1 is presented as a preferred embodiment according to the present invention, a device configuration for tilt compensation for each disc position of the optical recorder and player

2 is a flowchart illustrating the entire process of the tilt compensation method for each optical disk position according to the present invention.

FIG. 3 is a relation diagram of a disc bending type, a tilt compensation amount and a DC level value of a focus actuator driving signal.

3a is a type in which the tilt compensation amount and the focus actuator DC level change linearly with moving from the inner circumference to the outer circumference,

3b is a type in which the tilt compensation amount and the focus actuator DC level change linearly as it moves from the inner circumference to the middle quartet, but is maintained at a constant value from the middle circumference to the outer circumference,

3c shows a type in which the tilt compensation amount and the focus actuator DC level are maintained at a constant value from the inner circumference to the middle quartet, but are linearly changed from the middle circumference to the outer circumference.

<Code Description of Main Parts of Drawing>

12: tilt error generating unit 13: tilt controller

14: tilt drive

The present invention relates to a tilt control apparatus and a control method in an optical recorder or player, and more particularly, to accurately compensate the tilt of the disk over the entire area of the disk in a short time to compensate for the tilt according to the position of the disk. It relates to a control device and a control method thereof.

Conventional optical disc systems generally perform recording / reproduction of data without performing tilt control in controlling the system. However, as optical disk systems have become more dense, the need for tilt control has emerged. As a result, pick-up has been proposed to control tilt through a three-axis actuator.

In addition to the above methods, a tilt detector, RF signal change, tilt error (TE) signal change, and the like, which are separately configured in the conventional signal detection for tilt control, have been proposed to control the tilt.

Based on this control method, it is a method to perform proper tilt compensation over the entire disk area. The tilt compensation value is fixed and maintained at a specific position of the disk, or the compensation value is measured in the inner and outer circumferences. There have been methods of linearly compensating by the difference of the teeth, and determining a plurality of tilt compensation positions to measure the compensation value, and compensating by linearizing the compensation value difference measured for each compensation position.

However, the two methods mentioned above can determine the compensation value within a relatively fast time, but there is a possibility that the compensation error due to the simple linearization is large, and the last method is capable of relatively accurate tilt compensation, but it takes a long time to determine the compensation value. This has been.

The present invention has been presented to solve the problems of the prior art,

It is an object of the present invention to provide a method for compensating tilt over the entire area of an optical disc in a relatively fast time.

Another object of the present invention is to ensure high quality reproduction performance through accurate tilt compensation.

Another object of the present invention is to ensure high quality recording performance through accurate tilt compensation.

The present invention for achieving the above object is a tilt error generation unit for generating a tilt error signal from the signal received from the optical pickup; A tilt controller configured to receive the tilt error signal, a focus actuator driving signal, and position information of the disk to generate a control signal for compensating the tilt; And a tilt driver for driving the pickup in accordance with the control signal to perform tilt control.

According to the present invention, there is provided a tilt control apparatus according to a disc position in an optical recorder and player, characterized in that it comprises means for determining the disc type typed according to the type of warp of the optical disc.

The present invention also includes the steps of tying the type of disk according to the type of bending of the optical disk; Determining the type of optical disc to measure; And performing tilt compensation according to the determined type of the optical disk, and a tilt compensation method for each disc position of the optical recorder and player.

According to the present invention, it is preferable to provide a tilt compensation method for each disc position of the optical recorder and player, characterized in that the bending type of the optical disk is determined by comparing the focus actuator drive signal DC level.

According to the present invention, there is provided a tilt compensation method for each disc position of an optical recorder and player, characterized in that the bending type of the optical disk is determined by comparing the DC level of the focus actuator driving signals measured at the inner circumference, the middle circumference, and the outer circumference.

The tilt compensation method according to the present invention comprises the steps of measuring the respective compensation amount and the focus actuator drive signal DC level from the inner circumference, the outer circumference of the optical disk, and measuring the focus actuator drive signal DC level in the quartet; Comparing the respective focus actuator drive signals to determine a disc bending type; And performing tilt compensation according to the type of the disc determined according to the warping type.

According to the present invention, when the focus actuator driving signal DC level in the mid-range falls within the middle range of the values of the inner circumference and the outer circumference, the linear compensation is performed by using the difference between the tilt compensation amounts measured at the inner circumference and the outer circumference of the disk. Disclosed is a disc position tilt compensation method of an optical recorder and player.

According to the present invention, when the focus actuator driving signal DC level in the mid-period is substantially the same as the DC level in the outer periphery, the section from the inner circumference to the middle circumference is linearly compensated using the difference in the tilt compensation measured in the inner circumference and the outer circumference. In addition, in the section from the center to the outer periphery, there is provided a tilt compensation method for each disc position of the optical recorder and player, characterized in that the amount of compensation on the outer periphery is maintained.

According to the present invention, when the focus actuator driving signal DC level in the middle is substantially the same as the DC level in the inner circumference, the interval from the inner circumference to the middle circumference maintains the compensation amount in the inner circumference, and the inner circumference and the outer circumference in the middle circumference. The present invention provides a tilt compensation method for each disc position of an optical recorder and player, characterized in that linear compensation is performed by using a difference between tilt compensation amounts measured at an outer circumference.

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

1 shows a tilt control device in a humble recorder or player according to the present invention, wherein the control device includes an optical pickup unit 10, a tilt driving unit 11, a tilt error generating unit 12, and a tilt controller 13. , The tilt driving unit 14 and the filter unit 15 are configured.

The tilt error generator 12 generates a tilt error signal from the signal received from the optical pickup 10, and the tilt controller 13, together with the tilt error signal, passes the focus actuator drive signal DC level through the filter 15. And receiving position information of the disk to generate a control signal for compensating the tilt.

The tilt driver 14 drives the filter driving device 11 constituting the optical pickup 10 according to the control signal to perform tilt control.

The tilt control apparatus according to the present invention includes a means for determining the disc type according to the type of bending of the optical disc. Accordingly, by comparing the DC level values of the focus actuator driving signals for each position, it is determined which type of the optical disk corresponds, and a tilt compensation method determined according to the determined type is applied.

2 is a flowchart illustrating the entire process of the tilt compensation method for each optical disk position according to the present invention.

First, when the optical disc is inserted into the apparatus, the pickup moves to the inner circumference of the optical disc (step 101).

The tilt compensation amount at the inner circumference of the optical disc is determined, and the focus actuator drive signal DC level value at the inner circumference is recorded from the tilt error generator (step 102).

After recording the focus actuator drive signal DC level value at the inner circumference, the pickup moves to the outer circumference of the optical disc again (step 103).

After moving to the outer periphery of the optical disc, the tilt compensation amount at the outer periphery of the optical disc is determined, and the focus actuator drive signal DC level value at the outer periphery is recorded from the tilt error generator (step 104).

After recording the focus actuator drive signal DC level value at the outer circumference, the pickup moves back to the circumference of the optical disc (step 105).

After moving to the quintet of the optical disc, the focus actuator drive signal DC level value at the quintet of the optical disc is recorded (step 106).

After recording the focus actuator drive signal DC level value at the center of the optical disk, the tilt correction type for each position of the optical disk is determined (step 107).

After determining the tilt correction type for each position of the optical disk, tilt correction is performed according to the method determined for each type (step 108).

Hereinafter, the tilt correction type and the correction method according to the position of the optical disc will be described in more detail.

The optical disc can be determined from the relationship between the disc deflection type, the tilt compensation amount and the DC level value of the focus actuator drive signal.

FIG. 2A shows the first type (called type 1), in which the tilt compensation amount and the focus actuator DC level value change linearly with the movement from the inner circumference to the outer circumference, and FIG. 2B shows the second type (type 2). As the moving from the inner circumference to the quartet, the tilt compensation amount and the focus actuator DC level change linearly, but the type is maintained at a constant value from the quartet to the outer circumference, and FIG. 2C shows a third type (type 3). Although the tilt compensation amount and the focus actuator DC level value are maintained at a constant value from the inner circumference to the middle circumference, a linearly changing type is shown from the mid circumference to the outer circumference.

According to the present invention, an appropriate tilt compensation measure can be made over the entire area of the optical disc by using the proportional relationship between the tilt compensation amount and the focus actuator DC level value. More specific examples of this are given in the following examples.

First, (1) After measuring the tilt compensation amount on the inner circumference of the optical disk, the optimum tilt bias value (denoted as TiltInnerBias) is stored, and the focus actuator DC level value (indicated as FDrvInner) on the inner circumference is stored.

(2) After measuring the tilt compensation amount on the outer periphery of the optical disc, the optimum tilt bias value (indicated as TiltOuterBias) is stored, and the focus actuator DC level value (indicated as FDrvOuter) in the outer periphery.

(3) The focus actuator drive signal DC level value (indicated as FDrvMiddle) is stored in the quintet.

(4) The stored FDrvInner, FDrvMiddle, and FDrvOuter are compared to determine whether they correspond to Types 1, 2, and 3.

(5) If it is determined as Type 1, the linear compensation is performed using the difference between TiltInnerBias and TiltOuterBias from the inner circumference to the outer circumference.

(6) When the result is judged as type 2, linear compensation is performed using the difference between TiltInnerBias and TiltOuterBias from the inner circumference to the middle quartet, and the TiltOuterBias value is maintained from the middle circumference to the outer circumference.

(7) If it is determined as Type 3, the TiltInnerBias value is maintained from the inner circumference to the middle circumference, and linear compensation is performed using the difference between the TiltInnerBias and the TiltOuterBias from the middle circumference to the outer circumference.

As described through the above-described preferred embodiment of the present invention, the focus actuator driving signal DC level value in the mid-range is measured and compared with the values in the inner and outer circumferences to determine the type of the disk, and the compensation method according to the determined type. This determination makes it possible to perform a simple and accurate tilt control.

According to the present invention, it is possible to determine an appropriate tilt compensation value according to the position of the disc by relatively accurately reflecting the degree of warpage of the disc over the entire area of the disc within a relatively quick time. This properly reflected tilt compensation provides the effect of ensuring high quality reproduction performance and recording performance over the entire position of the optical disc.

As described above, although described with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and modified within the scope of the present invention without departing from the spirit and scope of the invention described in the claims below. It will be appreciated that it can be changed.

Claims (9)

A tilt error generator for generating a tilt error signal from a signal received from the optical pickup; A tilt controller configured to receive the tilt error signal, a focus actuator driving signal, and position information of the disk to generate a control signal for compensating the tilt; And a tilt driving unit configured to drive the pickup according to the control signal to perform tilt control. The tilt control apparatus according to the position of the disc in the optical recorder and player according to claim 1, characterized by comprising means for determining the type of disc typed according to the type of bending of the optical disc. Categorizing the type of disk according to the type of bending of the optical disk; Determining the type of optical disc to measure; And performing tilt compensation according to the type of the determined optical disc. 4. The tilt compensation method of claim 3, wherein the bending type of the optical disk is determined by comparing the focus actuator driving signal DC level. 5. The tilt compensation method of claim 4, wherein the bending type of the optical disk is determined by comparing the DC level of the focus actuator driving signals measured at the inner circumference, the middle circumference, and the outer circumference. The method of claim 5, wherein the tilt compensation method Measuring the respective compensation amounts and the focus actuator driving signal DC level from the inner and outer circumferences of the optical disk, and measuring the focus actuator driving signal DC level in the mid-range; Comparing the respective focus actuator drive signals to determine a disc bending type; And performing tilt compensation according to the type of the disc determined according to the type of warpage. 10. The linear compensation according to claim 6, wherein when the focus actuator driving signal DC level in the mid-range is in the middle range between the values of the inner circumference and the outer circumference, the linear compensation is performed by using the difference between the tilt compensation measured at the inner circumference and the outer circumference of the disk. Tilt compensation method for each disc position of an optical recorder and player characterized in that 7. The method of claim 6, wherein if the focus actuator driving signal DC level in the middle is substantially the same as the DC level in the outer circumference, the interval from the inner circumference to the middle circumference is linearly compensated using the difference in the tilt compensation measured at the inner circumference and the outer circumference. And a tilt compensation method for each disc position of the optical recorder and player, characterized in that for maintaining the compensation amount in the outer circumference in the section from the middle to the outer circumference. 7. The method of claim 6, wherein when the focus actuator driving signal DC level in the middle is substantially the same as the DC level in the inner circumference, the section from the inner circumference to the middle circumference maintains the compensation amount in the inner circumference, and in the section from the middle to the outer circumference. Tilt compensation method for each disc position of the optical recorder and player characterized in that the linear compensation is performed using the difference of the tilt compensation amount measured in the inner and outer circumference.

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