KR20050110524A - Method for controlling tilt in optical disc device - Google Patents

Abstract

The present invention relates to a tilt control method in an optical disk device, wherein an optimal disk offset value for each disk is detected in advance by using a standard disk without a skew component, and then an optical disk device such as a DVD recorder or the like. When the optical disc is inserted and seated in the apparatus, the tilt control value can be quickly selected and applied to the memory within the memory, and the tilt control is performed. It is a very useful invention that can efficiently shorten the time required for the circuit, and can also compensate mechanically the deviation caused by the skew correction of the optical pickup.

Description

Tilt control method in optical disc device {Method for controlling tilt in optical disc device}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tilt control method in an optical disc apparatus. For example, in an optical disc apparatus such as a DVD-Recorder, a tilt offset that is optimal for a disc type that is inserted and seated in the apparatus. Offset) relates to a tilt control method in the optical disk device to be able to apply the value.

Generally, optical discs that are widely used and commercialized include CD series and DVD series. In the future, Blu-ray Disc series is expected to be developed and commercialized. For example, the CD series includes a CD-ROM for exclusive use of reproduction, a CD-R that can be recorded once, a CD-RW that can be rewritten, and the like. The DVD series includes a DVD-ROM for exclusive use of reproduction. Recordable DVD-R, rewritable DVD-RW, and the like.

On the other hand, in the case of the DVD, since the interval of the track pitch is smaller than that of the CD and the margin for the optical refractive index is not sufficient, the focus lens included in the optical pickup is included. Tilt control operation to adjust the inclination of both sides of the is required.

Accordingly, in an optical disk device such as a DVD-Recorder, when the optical disk is inserted and seated in the device, the focus and tracking servo operations are performed, and the tilt tilt value is optimally adjusted while varying the inclination of both sides of the focus lens. Will be detected.

Then, by applying the tilt offset value detected as described above, by adjusting the inclination of both sides of the focus lens, the recording surface of the optical disk and the focus lens can be in parallel to read or record data accurately. In this case, there is a problem that the tilt control takes a long time because the tilt offset value has to be detected every time the optical disk is inserted and seated in the apparatus.

Further, in the manufacturing process for manufacturing the optical disk device, one side of the base on which the optical pickup is bound is finely adjusted in the up / down direction to correct the physical skew of the optical pickup. In this case, There is a problem that a mechanical deviation exists.

Therefore, the present invention was created to solve the above problems, and in an optical disc device such as a DVD recorder, it is possible to store and manage the tilt offset value that is optimal for the type of optical disc, and is also optimal for the type of optical disc inserted and seated in the device. It is an object of the present invention to provide a tilt control apparatus and method in an optical disc apparatus for enabling a quick selection of a tilt offset value.

Tilt control method in the optical disk device according to the present invention for achieving the above object, the first step of identifying the type of optical disk is inserted into the device; Selecting and reading a tilt offset value stored in association with the identified type of optical disk in a memory; And applying the read tilt offset value to the tilt control.

Hereinafter, a preferred embodiment of the tilt control method in the optical disk device according to the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 shows a configuration of an optical disk apparatus to which the present invention is applied. The optical disk apparatus includes, for example, a focus lens 20, a laser diode 21 for CD, a laser diode 22 for CD, and a beam. Optical pickup including splitter 23, photo detector 24, LD driver 25, RF detector 26, MPP detector 27, microcomputer 29, servo 28, and memory 30 ) Is configured to include.

In the RF detector 26, for example, signals Sa, Sb, Sc, and Sd output from the photo detector 24 divided into four regions A, B, C, and D are respectively. The sum is detected as an RF signal (RF = Sa + Sb + Sc + Sd), and the MPP detection unit 27 partially sums signals output from the four divided photo detectors 24, respectively. And subtract the MPP (Main beam Push Pull) signal MPP = (Sa + Sb) − (Sc + Sd).

The memory 30 stores and manages the tilt offset values that are optimal for the type of optical disk. For example, as shown in FIG. 2, one tilt of each disk for the static tilt control is performed. The offset values may be stored in association with the disc type information.

In addition, as shown in FIG. 3, for example, as shown in FIG. 3, a plurality of tilt offset values for each disk for dynamic tilt control are associated with a disk type and corresponding recording position information. The tilt offset value of each disc may be stored by detecting an optimal tilt offset value in a state where a standard disc having no skew component is inserted into the device. It can be stored and managed in advance by a manufacturing process for storing in a memory.

On the other hand, in the microcomputer 29, in the state where the tilt offset value detection mode for each disc is set, when the standard disc 10 inserted into the apparatus is a reproduction-only optical disc, as shown in FIG. The tilt control value at the time when the level of the RF signal detected by the RF detection unit 26 becomes the highest level while varying the inclination of both sides of 20) is detected and stored as a tilt offset value that is optimal for the type of the optical disk. Done.

On the other hand, when the standard disc 10 is an optical disc capable of being written once or an optical disc capable of being rewritable, the MPP signal level detected by the MPP detection unit 27 is the highest while varying the inclination of both sides of the focus lens 20. The tilt control value at the time of reaching the level is detected and stored as a tilt offset value optimal for the type of the optical disc.

When a new optical disc is inserted and seated while the tilt offset value detection mode is released, after checking the type of the optical disc, the tilt offset value stored in association with the type of the optical disc is read out from the memory 30. By applying, the tilt control operation is performed, which will be described in detail as follows.

4 is a flowchart illustrating a tilt control method in the optical disk apparatus according to the present invention. In the microcomputer 29, as described above, the optimum tilt offset value detection mode for each disk is set ( S10), when a standard disc having no skew component is inserted and seated (S11), while adjusting the inclination of both sides of the focus lens while detecting the level of the RF signal or the MPP signal, the optimum tilt offset value is detected. (S12).

For example, in the microcomputer 29, when a reproduction-only standard disc such as a CD-ROM or a DVD-ROM is inserted into the device, the level of the RF signal detected by the RF detector 26 is the highest level. After the tilt control value is detected as the optimal tilt offset value, the tilt control value is stored and managed in the memory together with the disc type information for identifying the type of the optical disc (S13).

On the other hand, in the microcomputer 29, when a recordable standard disk such as CD-R / RW or DVD-R / RW is inserted into the apparatus, the level of the MPP signal detected by the MPP detector 27 is the highest level. After the tilt control value is detected as the optimal tilt offset value, the tilt control value is stored and managed in the memory together with the disc type information for identifying the type of the optical disc.

On the other hand, since there may be a section in which the data is not recorded in the recordable optical disc, the MPP signal level is detected instead of the RF signal. In the microcomputer 29, static tilt control is performed on the optical disc apparatus. If applicable, as described above with reference to FIG. 2, one tilt offset value for each disc is detected and stored in the memory 30 together with the disc type information.

In the case where dynamic tilt control is applied to the optical disk device, as described above with reference to FIG. 3, after detecting a plurality of tilt offset values for each disk, together with the disk type information and the corresponding recording position information. The memory 30 is stored in the memory 30.

In addition, the microcomputer 29 releases the optimal tilt offset value detection mode as described above at the user's request (S14), and when a new optical disk is inserted and seated in the device (S15). The reflection amount, navigation information, or the like is searched for, and the type of the optical disc is discriminated and confirmed (S16).

After retrieving disc type information corresponding to the identified type of optical disc from the memory, a tilt offset value stored in association with the disc type information is read (S17). For example, as shown in FIG. As described above, when only one tilt offset value is stored in association with the disc type information, the tilt offset value is applied to the tilt control operation (S18).

For example, as shown in FIG. 5, when the optical disc inserted in the apparatus is a DVD-ROM and performs a static tilt control operation, only one tilt offset value is applied to the entire optical disc. 6, when the optical disc inserted in the apparatus is a DVD-RW and performs a dynamic tilt control operation, it is possible to selectively apply different tilt offset values according to the recording position of the optical disc. do.

Subsequently, in the state where the optimum tilt offset value for each disc is applied as described above, the user can perform a desired data reproduction or recording operation (S19) to quickly select and apply the optimum tilt offset value for the type of optical disc. Will be.

Or more, preferred embodiments of the present invention described above, for the purpose of illustration, those skilled in the art, within the technical spirit and the technical scope of the present invention disclosed in the appended claims below, to further improve various other embodiments Changes, substitutions or additions will be possible.

In the tilt control method of the composite optical disk apparatus according to the present invention, which is constructed and configured as described above, after detecting optimal tilt offset values of each disk in advance, using a standard disk having no skew component, In the memory in the optical disk device such as a recorder, the storage and management together with the disk type information, and when the optical disk is inserted and seated in the device, the tilt offset value optimal for the type of the optical disk can be quickly selected and applied in the memory. By doing so, it is possible to efficiently shorten the time required for tilt control, and it is a very useful invention that can mechanically compensate for mechanical deviation caused by skew correction of the optical pickup.

1 illustrates a configuration of an optical disk device to which the present invention is applied.

2 illustrates an embodiment of tilt offset values for static tilt control stored and managed in accordance with the present invention;

3 illustrates an embodiment of tilt offset values for dynamic tilt control stored and managed according to the present invention;

4 is a flowchart illustrating a tilt control method in the optical disk device according to the present invention;

5 illustrates an embodiment in which one tilt offset value for each disc type is selectively applied according to the present invention.

FIG. 6 illustrates an embodiment in which a plurality of tilt offset values are selectively applied for each disc type according to the present invention.

※ Explanation of code for main part of drawing

10 optical disc 20 focus lens

21,22: laser diode 23: beam splitter

24: photo detector 25: LD driver

26: RF detector 27: MPP detector

28: servo unit 29: microcomputer

30: memory

Claims (5)

Identifying a type of optical disc inserted and seated in the device; Selecting and reading a tilt offset value stored in association with the identified type of optical disk in a memory; And And applying the read tilt offset value to the tilt control. 3. The method of claim 1, And detecting the tilt offset value that is optimal for the standard disc, and storing the tilt offset value in association with the type of the standard disc. The method of claim 2, When the standard disc is a reproduction-only optical disc, the optimum tilt offset value is detected based on the RF signal level. When the standard disc is the recordable optical disc, the optimum tilt offset value is detected based on the MPP signal level. Tilt control method for an optical disk device, characterized in that. The method of claim 2, After detecting one tilt offset value that is optimal for the standard disk, the tilt offset value is stored as information for the static tilt control in association with the type of the standard disk. Tilt control method. The method of claim 2, After detecting a plurality of tilt offset values that are optimal for different recording positions in the standard disk, the plurality of tilt offset values are associated with the type of the standard disk and the corresponding recording positions, thereby providing dynamic tilt control. Tilt control method for an optical disk device, characterized in that for storing as information for.