KR100626962B1 - Method for detecting type of optical disk in a dvd-compatible holographic rom system - Google Patents

Abstract

The present invention relates to a method for determining the type of a disc in a DVD compatible holographic ROM system. That is, in the present invention, in determining a disc type in a DVD-compatible holographic ROM system, a discretion of the disc mounted by a user can be quickly and accurately recognized through sequential inspection of a focusing error signal and a tracking error signal for the disc. By discriminating, the system can be prevented from malfunctioning, and the data desired by the user can be reproduced quickly and reliably.

Description

How to determine the disc type in a DVD compatible holographic ROM system {METHOD FOR DETECTING TYPE OF OPTICAL DISK IN A DVD-COMPATIBLE HOLOGRAPHIC ROM SYSTEM}

1 is a schematic block diagram of a DVD compatible holographic ROM system to which an embodiment of the present invention is applied;

2 is a process flow chart for determining a disc type in a DVD compatible holographic ROM system according to an embodiment of the present invention.

<Brief description of the major symbols in the drawings>

10: first light source 30: second light source

32: flat plate 34: lens

36: reflection mirror 16: beam splitter

18: flat plate 26, 44: light detection unit

28: control unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a holographic rom system, and more particularly to a method of determining the type of disc in a DVD compatible holographic rom system.

In general, an optical recording medium such as a CD or DVD is a storage medium having hundreds of megabytes of data capacity of several hundred times that of a floppy disk which is a magnetic recording medium having a capacity of 2 megabytes. As it is possible, it is currently used as a multimedia storage medium in various fields.

In recent years, by recording the intensity and direction of the object light by changing the angle of the reference light, such as angle superposition, wavelength superposition, and phase code superposition, the three-dimensional image of the object can be displayed, and also in units of pages of binary data. Development of holographic discs capable of playing CDs and DVD discs and holographic discs far exceeding the storage capacity of CDs and DVDs by storing data in the form of thousands of holograms is also underway.

Accordingly, a user using a DVD-compatible holographic ROM can selectively mount a DVD disc or a holographic disc in the system to play the desired data. For this purpose, a DVD disc or holographic mounted by a user in a DVD-compatible holographic ROM system is used. The disc must be accurately determined, and when the system cannot accurately determine the type of disc, there is a problem in that it is difficult to reproduce data smoothly.

Accordingly, an object of the present invention is to provide a method for determining the type of a disc in a DVD compatible holographic ROM system.                         

In order to achieve the above object, the present invention provides a method for determining a disc type in a DVD-compatible holographic ROM system, the method comprising: (a) performing a focusing servo operation while driving a disc at a DVD disc speed when a disc is loaded in a loader; (B) checking whether a focusing error signal is normally output according to the focusing servo operation; and (c) DVD tracking after focusing using the focusing error signal when the focusing error signal is normally output. Performing a servo operation; (d) checking whether a tracking error signal according to the DVD tracking servo operation is normally output; and (e) determining the disc as a DVD disk when the tracking error signal is normally output. And reproducing the data of the DVD disc through the tracking servo. It features.

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

FIG. 1 is a block diagram illustrating a servo device of a DVD holographic ROM player to which an embodiment of the present invention is applied, and includes a first optical path through which first light from the first light source 10 is incident on the surface of the disk 2. (S1), the second light path S2 for causing the second light from the second light source 30 to enter the surface of the disk 2, and the first light for detecting the first light reflected from the disk 2; Data detected by the first light detector (PDIC2) 44, the second light detector (PDIC1) 26 for detecting the second light diffracted by the disk 2, and the second light detector (PDIC1) 26. To perform tracking control of the holographic ROM disk and to perform tracking and focus control of the digital data disk or focus control of the holographic ROM disk according to the data detected by the first light detector PDIC1 44. The control unit 28 is included.

The first light path S1 includes a first light source 10 that emits first light, a collimating lens 12 that converts the first light of the first light source 10 into parallel light, and a lens 12. A laser beam that passes through the first light of the first light source 10 and reflects the second light, and the first light emitted from the first light source 10 (S polarization). And a beam splitter (PBS: Polarizer Beam Splitter) 16 that transmits and reflects the first light (P polarization) coming out from the disk 2 and diffracted in the light or disk 2 of the beam splitter 16. And a lens wave plate 18 for transforming the light into the disk 2.

로 변형하는 변형판(32)과, 변형판(32)의 광을 렌즈(34)를 평행광으로 바꾼 후에 디스크(2)에 소정의 각도로 입사하도록 하는 반사 미러(36)를 포함한다.The second light path S2 includes a second light source 30 that emits second light and a second light of the second light source 30.

The deformable plate 32 which deform | transforms into the lens, and the reflecting mirror 36 which injects the light of the deformable plate 32 into the disk 2 after changing the lens 34 into parallel light are included.

Here, the first light source 10 is a red laser light source having a predetermined wavelength, for example, a wavelength of 650 nm, and generates laser light required for a digital data disk such as a DVD. The second light source 30 is a green laser light source having a predetermined wavelength, for example, a wavelength of 532 nm, and generates laser light required for a holographic ROM disk.

The first light detector PDIC2 44 detects the first light that has passed through the lens 20, the deformation plate 18, and the beam splitter PBS 16 of the first light path S1, and controls the detected data. 28). At this time, a collimating lens 22 and an astigmatism lens 24 are formed between the beam splitter PBS 16 and the first light detector PDIC2 26.

The second light detector PDIC1 26 is reflected by the reflection mirror 14 through the beam splitter PBS 16 through the lens 20 and the deformation plate 18 of the first light path S1. Light is detected and the detection data is transmitted to the control unit 28. In this case, a lens 38, an SLI 40, and a lens 42 are formed between the reflective mirror 14 and the second light detector PDIC1 44.

The controller 28 horizontally shifts the position of the lens 20 located above the disk 2 of the first optical path S1 according to the data detected by the first optical detector PDIC2 44 to determine the holographic ROM disk. Perform tracking control. In accordance with the data detected by the second light detector (PDIC1) 26, the position of the lens 20 on the disc 2 is moved horizontally or vertically to perform tracking and focus control of a digital data disc such as a DVD or holographically. Performs focus control of the ROM disk.

2 illustrates an operation control flow for determining the type of a disc in a DVD compatible holographic ROM system according to an embodiment of the present invention. Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2.

First, when an optical disc for playback is mounted on the loader of the DVD-compatible holographic ROM system by the user, the controller 28 recognizes the disc mounting in step S200, and proceeds to step S202 to proceed to step S202. Drive at a predetermined speed for playing the DVD disc.

Subsequently, the control unit 28 injects a red laser to the disc to reproduce the DVD disc in step S204, and operates a focusing servo using astigmatism provided in the system in step S206. Do this.

Thereafter, the controller 28 checks whether a focusing error occurs due to the focusing servo operation in step S208. At this time, if a focusing error signal is not output even after performing a few focusing servo operations, the controller 28 recognizes that the disk is not mounted, and in step S210, “No disk ( no disk) "to inform the user.

On the contrary, when the focusing error signal is normally output according to the focusing servo operation, the controller 28 focuses using the focusing error signal, and then proceeds to step S212 to track the tracking servo of the DVD disc. Perform the action.

In step S214, the controller 28 checks whether a tracking error signal according to the DVD disc tracking servo operation is normally output. At this time, if the tracking error signal is normally output, the control unit 28 proceeds to step S216 to determine the mounted disk as a DVD disk, and in step S218 RF of the DVD disk through a tracking servo. Stabilize the signal and play back the data.

On the contrary, if the tracking error signal according to the DVD tracking servo operation is not normally output in step S214, the controller 28 proceeds to step S220 in step S214 and continues with a red laser. While taking a focusing servo operation, a green laser is incident on the disc at a predetermined angle, and the disc drive speed is driven at the holographic ROM disc drive speed in step S222.

Subsequently, the controller 28 performs a tracking servo operation of a three-hole focus inspection method (3 hole method), which is a tracking technique of the holographic ROM disk, in step S224, and determines whether a tracking servo error is output in step S226. Check it.

At this time, if a tracking servo error is output, the controller 28 proceeds to step S228 to determine the mounted disk as a DVD disk, and in step S230, RF of the DVD disk through the tracking servo. Stabilize the signal and play back the data.

As described above, in the present invention, in determining a disc type in a DVD-compatible holographic ROM system, the disc type mounted by a user can be quickly and accurately determined through sequential inspection of a focusing error signal and a tracking error signal. Recognition / discrimination prevents malfunction of the system and enables the user to quickly and reliably reproduce the desired data.

 Meanwhile, in the above description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the invention should be determined by the claims rather than by the described embodiments.

As described above, in the present invention, in determining the disc type in the DVD-compatible holographic ROM system, the disc type mounted by the user is sequentially determined by sequentially checking the focusing error signal and the tracking error signal for the loaded disc. By quickly and accurately recognizing / identifying, there is an advantage of preventing malfunction of the system and enabling the user to quickly and reliably reproduce desired data.

Claims (5)

A method for determining the disc type in a DVD compatible holographic ROM system, (a) performing a focusing servo operation while driving the disc at the DVD disc speed when the disc is loaded in the loader; (b) checking whether a focusing error signal according to the focusing servo operation is normally output; (c) performing a DVD tracking servo operation after focusing using the focusing error signal when the focusing error signal is normally output; (d) checking whether a tracking error signal according to the DVD tracking servo operation is normally output; (e) determining that the disc is a DVD disc when the tracking error signal is normally output, and reproducing data of the DVD disc through a tracking servo; (f) when the tracking error signal is not normally output, injecting a green laser into the disc at a predetermined angle and driving the holographic disc at a speed; (g) performing tracking servo on the disc driven at the holographic disc speed and checking whether the tracking servo error signal is normally output; (h) identifying the disc as a holographic disc when the tracking servo error signal is normally output, and reproducing data of the holographic disc through the tracking servo; Disc type determination method in a DVD-compatible holographic ROM system comprising a. The method of claim 1, In the step (b), if the focusing error signal is not outputted normally, (i) further comprising the step of recognizing that the disc in the loader is not mounted, the DVD compatible holographic ROM system characterized in that it further comprises How to determine the disk type on your computer. The method of claim 1, In the step (a), the disc type discrimination method in the DVD compatible holographic ROM system, characterized in that the red laser is incident on the disk surface during the focusing servo operation of the mounted disk. delete The method of claim 1, In the step (g), the tracking servo control of the holographic disc is performed through a three-hole focus check method, the disc type discrimination method in a DVD-compatible holographic ROM system.

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