KR100861950B1 - Apparatus for distinguishing the kind of optical disc and method thereof - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc discrimination apparatus and a method thereof, and more particularly, to an optical disc discrimination apparatus and method for greatly shortening the DVD lead-in time in an optical disc reproducing and recording apparatus.

According to an aspect of the present invention, in the optical disc discrimination apparatus, an optical disc type is determined. The optical disc type is determined according to a track error signal of an RF unit, and when the optical disc is any one series, after setting the coefficient of a specific optical disc, the optical pickup is performed. And driving the spindle motor, and comparing the track error signal with a preset reference value and recovering a specific optical disc track error signal coefficient when the optical disc is determined to be a specific optical disc.

Description

Apparatus for distinguishing the kind of optical disc and method approximately}

1 is a flowchart of an optical disc determination method according to the prior art,

2A is a block diagram of an optical disc discrimination apparatus according to an embodiment of the present invention;

2B is a detailed configuration diagram of an optical disc discrimination apparatus according to an embodiment of the present invention;

3 is a flowchart of an optical disc determination method according to an embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

1: optical disc 10: optical pickup

11: LD for DVD / CD 12: LD for BD

13: 1st PD 14: 2nd PD

15: Actuator 16: Objective Lens for DVD / CD

17: objective lens for BD 20: RF

30: servo unit 40: signal processing unit

50: microcomputer 60: spindle motor

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc discrimination apparatus and a method thereof, and more particularly, to an optical disc discrimination apparatus and method for greatly shortening the DVD lead-in time in an optical disc reproducing and recording apparatus.

In general, an optical disc is a storage medium in which data can be recorded and reproduced by laser light. In the past, a low density optical disc such as a compact disc (CD) or a digital versatile disc (DVD) has been mainly used. As storage capacities gradually reach their limits, new high-density optical discs, such as BD (Blu-Ray Disc Recordable / Rewritable) or HD-DVD (High Density DVD), can be used to store large amounts of data over tens of Gbytes. Its use is expanding.

These various high density / low density optical discs have different wavelengths, storage capacities, track pitches, and substrate thicknesses of laser light used for recording and playback. It is configured to support an optical disc, and for this purpose, the type of the optical disc mounted on the optical disc drive is determined before data recording and reproduction.

Conventional Optical Disc Discrimination Method As shown in Fig. 1, in an optical disc reproducing apparatus for reproducing a plurality of types of optical discs having different thicknesses, the optical discs that generate optical signals differ from each other by a disc thickness difference. The sensor unit includes a plurality of light receiving elements for receiving the light signals that are quickly reflected, and the optical signals reflected from the light receiving elements of the sensor unit are measured (S1) to determine the type of the optical disk.

Discs such as BD, HD DVD, DVD, and CD are discriminated, and signal processing and controller discrimination coefficients corresponding to the DVD series discs are set (tracking error signal, focusing error signal, and spindle error signal as coefficients). Then, through signal adjustment and controller driving, operations necessary for recording and reproduction are performed. In this case, as the type of the optical disc increases, the time required for disc determination increases, and accordingly, the lead-in time of the recorder and the player increases.

Further, when the disc of the DVD system is discriminated (S2), the controller is stopped (S8, S11) and the signal processing circuit and controller coefficients suitable for the discrimination result are reset (S9, S12) (tracking error signal, focusing error signal, Set the spindle error signal to the coefficient). Drive the controller again (S10, S13).

At this time, the coefficient setting (S4) for discriminating the HD DVD at the time of discrimination in the HD DVD recorder and player, compared to the DVD recorder and player until the DVD disc is determined by the reflectivity of the disc and the focus and spindle controllers are driven. Focus and spindle controller driving and stabilization (S5), DPD track error signal size measurement (S6), PP track error signal change and size measurement (S7) and controller stop process is added to increase the lead-in time . In addition, most of the lead-in time increase is the time taken to drive, stabilize and stop the focus and spindle controllers that require mechanical motion.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems of the prior art, and an object of the present invention is to add a disc disc discrimination process in an apparatus for recording and reproducing an optical disc, thereby reducing the DVD lead-in time. The present invention provides a discriminating apparatus and method.

Another object of the present invention is to provide an optical disk discriminating apparatus and method which can more accurately and quickly discriminate an optical disk based on data measured from its reflection using a laser diode having a 650 nm wavelength used in a DVD.

Still another object of the present invention is to set a tracking error signal, a focusing error signal, and a spindle error signal suitable for a DVD disc after the determination of an optical disc of a DVD system as a DVD coefficient, and to set a DVD track error coefficient (a determined tracking error signal and a focusing error). Signal and spindle error signal set to the DVD coefficient) to provide an optical disc discrimination apparatus and method which can shorten the DVD lead-in time.

Technical means according to the present invention for achieving the above object is a spindle motor for rotating the optical disk,
An optical pickup for irradiating laser light to the optical disc, detecting light reflected from the optical disc, and controlling focus;
An RF unit generating a track error signal from a signal input from the optical pickup;
The optical disc is a DVD-based optical disc according to the track error signal, and when the optical disc is a DVD-based optical disc, a tracking error signal, a focusing error signal, and a spindle error signal are set as DVD coefficients to determine the optical pickup and spindle motor. Control the driving,
When the optical disc of the DVD series is determined to be an HD DVD disc by comparing the track error signal with a preset reference value, the optical pickup and the spindle motor are stopped and controlled, and the DVD coefficient set as the tracking error signal and focusing error of the HD DVD is set. And a microcomputer for controlling the optical pickup and the spindle motor to be restarted after setting the signal and the spindle error signal.

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According to the present invention, the time required for mechanical operation such as the control drive time, stabilization time, and stop time of the optical pickup and spindle motor for controlling the focus and the spindle is eliminated, which can drastically shorten the lead-in time of the DVD disc. There is an advantage.

In addition, the present invention can discriminate DVD discs and HD-DVD discs using an optical system used for general DVD recording / playback, thereby reducing the disc discrimination accuracy and the time required for disc discrimination, and discrimining optical discs in DVD systems. By setting the tracking error signal, focusing error signal, and spindle error signal suitable for the DVD disc to the DVD coefficient, and setting the DVD track error coefficient (the determined tracking error signal, focusing error signal, and spindle error signal to the DVD coefficient). DVD lead-in time can be shortened.

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

2A is a block diagram of an optical disc discrimination apparatus according to an exemplary embodiment of the present invention, which includes an optical disc 1, an optical pickup 10, an RF unit 20, a servo unit 30, a signal processing unit 40, and a microcomputer 50. ) And the spindle motor 60.

The optical disc 1 is a storage medium in which data can be recorded and reproduced by laser light, and a low density optical disc such as a compact disc (CD) or a digital versatile disc (DVD), and a Blu-ray Disc Recordable / Rewritable (BD) It includes high density optical discs such as HD-DVD (High Density DVD), and low density optical discs include play-only types such as CD, CD-ROM, DVD-ROM, and MD, CD-R, CD-RW, DVD-R, DVD. There are recordable types such as -RW, DVD + RW and DVD Random Access Memory (DVD-RAM).

In addition, the optical disc 1 is driven to rotate by the spindle motor 60, the spindle motor 60 is rotated by the motor drive (not shown) is controlled by a drive signal generated from the microcomputer 50.

The optical pickup 10 records data by irradiating laser light onto the surface of the optical disc 1, or outputs an RF signal by receiving reflected light reflected from the surface of the optical disc 1, and irradiates laser light having a wavelength of 650 nm. DVD / CD laser diode (LD) 11, BD (Blu-Ray Disc) laser diode (LD) 12 for irradiating laser light of 405 nm wavelength, and DVD / CD among optical discs 1 A first photo diode (PD 13) for receiving the reflected light reflected from the CD disk and converting it into an electrical signal, and a second for receiving the reflected light reflected from the BD disk among the optical disks 1 and converting it into an electrical signal, respectively. DVD / CD objective lens having a low aperture ratio (NA) 0.65 that focuses the photodiode (PD) 14 and the laser light radiated from the DVD / CD laser diode 11 to form spots on the DVD / CD disc. ) And the laser beam irradiated from the BD laser diode 12 And for a high aperture ratio of 0.85 BD to form a spot on a disk objective lens 17, it includes an actuator 15 for moving the vertical position of each objective lens (16,17). In addition, it further includes a spindle motor 60 for rotating the optical disk.

The optical pickup 10 also records data on the optical disc 10 by irradiating a recording surface of the optical disc 1 with a laser having a power comparable to the recording power through laser diodes 11 and 13. By irradiating the optical disk 1 with a laser of equivalent power, the data recorded on the optical disk 10 is reproduced (read).

In this case, an optical path for recording and reproducing data on a DVD / CD disc and an optical path for recording and reproducing data on a BD disc are formed separately, and although not shown in the drawing, divergent light is converted into parallel light in each optical path. A collimator lens, a beam splitter for splitting incident light, and the like. In this way, the optical pickup 10 can record data on the DVD / CD / BD disc or reproduce data recorded on the DVD / CD / BD disc by using the separated optical path.

The RF unit 20 generates a laser from a laser diode in the optical pickup 10 so as to receive the laser beam irradiated onto the recording surface of the optical disc 1 and reflected from the data recording surface of the optical disc 1. An electric signal transmitted from the photodiodes 13 and 14 generates an RF signal, which is reproduction data, a focus error signal (FE) that detects out of focus, and a track error signal that detects out of track. Error, TE) signal is generated.

In this case, the track error signal TE is a track error signal of a differential phase detection (DPD) method using a phase difference between electrical signals output from the first and second photodiodes 13 and 14 and the first and second photodiodes ( The track error signal of the PP (Push Pull) method using the difference between the electrical signals output from 13 and 14) is obtained.

The servo unit 30 refers to a focus error signal FE transmitted from the RF unit 20, a track error signal TE, and a spindle error signal transmitted from the microcomputer 50, and the like. A drive signal for the spindle is generated and the tracking and focus of the optical pickup 10 is controlled by referring to the tracking error signal and the focus error signal.

The signal processor (DSP) 40 restores the binary signal converted by the R / F unit 20 to digital data and transmits it to the microcomputer 50.

The microcomputer 50 controls the optical pickup 10, the RF unit 20, the servo unit 30, and the signal processor 40 according to a user's input command.

That is, the microcomputer 50 measures the reflectance of the disk and the distance between the surface layer and the recording layer according to the focus error signal generated by moving the 650 nm laser diode and the aperture ratio 0.65 objective lens 16 used for DVD recording and playback up and down. Determine whether it is an HD DVD disk or a DVD disk.

In addition, the microcomputer 50 performs signal processing suitable for a DVD disc, sets controller coefficients such as an optical pickup and a spindle motor (sets a tracking error signal, a focusing error signal, and a spindle error signal as coefficients), and provides optical signals for focus control. Drives the pickup and spindle motors.

In addition, after the optical pickup and the spindle motor are stabilized, the microcomputer 50 compares the size of the track error signal of the DPD method with a preset DPD reference value C1 and determines that the DVD ROM is greater than the reference value, and determines that the DVD ROM is smaller than the DPD reference value C1. If the track error is changed to the PP method, the track error signal is measured. If the track error signal is larger than the preset PP reference value (C2), it is judged as DVD-R. If the track error signal is smaller than the PP reference value (C2), it is judged as HD DVD. If it is determined that the DVD is determined, the track error coefficient is restored to the DVD with the determined tracking error signal, focusing error signal, and spindle error signal.

3 is a flowchart of an optical disc discrimination method according to an exemplary embodiment of the present invention, with reference to FIGS. 2A and 2B.

First, when the user inserts the optical disc 1 into the optical disc recording and reproducing apparatus, the optical disc recording and reproducing apparatus automatically performs an operation of determining the type of the optical disc 1.

In this case, the optical disc system first drives the laser diode 11 for DVD / CD in the optical pickup 10 to determine the type of the optical disc 1 so that the laser light of 650 nm wavelength is irradiated, and the laser of 650 nm wavelength. When light is irradiated, the actuator 15 is driven to perform a focus search for moving the DVD / CD objective lens 16 up and down to move the DVD / CD objective lens 16 closer to the optical disc 1, and then again. Away from the optical disc 1.

Next, the focus of the laser light passes through the recording layer of the optical disc 1 through the focus search for moving the objective lens 16 for DVD / CD up and down, and accordingly to the focus error signal FE generated by the RF unit 20. The disk reflectance and the distance between the surface layer and the recording layer are measured (S101) to determine the type of disk.

 Since the distance from the surface layer of the optical disc 1 to the recording layer is different for each optical disc 1 (reference is given to 0.1 mm for BD, 0.6 mm for DVD and HD-DVD, and 1.2 mm for CD), the reflectance of the optical disc will also vary.

Therefore, the microcomputer 50 determines the type of the optical disc 1 by measuring the reflectance of the disc and the distance between the recording layer and the surface layer with the focus error signal FE generated by the RF unit 20, and the determined optical disc 1 Determines whether the DVD series is a DVD series (S102). If it is not a DVD disk, it is determined as a DB or a CD (S103).

In this way, in order to determine the type of the optical disc 1 by the focus error signal FE, the microcomputer 50 has reflectance and distance data of the recording layer and the surface layer corresponding to the type of each optical disc 1 such as CD / DVD / BD. Is pre-stored.

Next, if the inserted optical disc 1 is a DVD series, the microcomputer 50 must accurately distinguish whether the inserted optical disc 1 is a DVD disc or an HD-DVD disc. This is because, in the case of HD-DVD discs, the distance between the disc surface layer and the recording layer is the same as that of the DVD disc, and the reflectance is similar.

Accordingly, the microcomputer 50 sets discrimination signal processing and DVD coefficients for discriminating HD DVD discs and DVD discs when the inserted optical disc 1 is a DVD series (tracking error signal, focusing error signal, spindle error signal). Is set to the DVD coefficient) (S104), and then the spindle motor 60 and the actuator 15 are driven (S105) to focus servo operation to control the DVD / CD objective lens 16 in the vertical direction. The recording layer of the optical disc 1 is accurately followed, and then the focus error is measured when the optical pickup and the spindle motor are stabilized.

At this time, the RF unit 20 is a track error signal obtained by the DPD (Differential Phase Detection) method using the phase difference between the electrical signals output from the photodiodes (13, 14), and the electrical signal output from the photodiodes (13, 14) The track error signal obtained by the PP (Push Pull) method using the difference between the signals is generated and transmitted to the microcomputer 50.

Accordingly, the microcomputer 50 determines whether the track error signal size of the DPD method transmitted from the RF unit 20 is greater than or equal to the preset DPD reference value C1 (S106), and as a result, the track error signal size of the DPD method is determined. If it is equal to or greater than the DPD reference value C1, it is determined as a recorded DVD disk (DVD ROM or DVD R).

If the track error signal size of the DPD method is not equal to or larger than the DPD reference value C1, the microcomputer 50 may determine whether the inserted optical disc 1 is an HD-DVD disc or an unrecorded area of a DVD R disc. It is determined whether the track error signal size of the PP method transmitted in step 20 is equal to or greater than the preset PP reference value C2 (S107), and if the track error signal size of the PP method is not equal to or greater than the PP reference value C2, the microcomputer ( 50 determines that the inserted optical disc 1 is an HD-DVD disc.

On the other hand, if the track error signal size of the PP system is equal to or larger than the PP reference value C2, the microcomputer 50 determines that the inserted optical disc 1 is a DVD disc (unrecorded area of the DVD R disc).

In addition, if the track error signal size of the DPD method is equal to or larger than the DPD reference value C1, the microcomputer 50 may determine whether the inserted optical disc 1 is a DVD ROM disc or a recording area of a DVD R disc. It is determined whether or not the magnitude of the track error signal of the PP scheme transmitted from the PMI is greater than or equal to the PP reference value C2.

At this time, if the track error signal size of the PP method is not equal to or greater than the PP reference value C2, the microcomputer 50 determines that the inserted optical disc 1 is a DVD ROM disc, and the track error signal size of the PP method is the PP reference value C2. If it is, the microcomputer 50 judges the inserted optical disc 1 as the recording area of the DVD R disc.

Next, when it is determined that the DVD disc (DVD ROM or DVD R) is determined, the track error coefficient is set to the coefficient of the tracking error signal, the focusing error signal, and the spindle error signal of the determined DVD (S108).

If it is determined that the HD DVD, the controller such as the optical pickup and the spindle motor is stopped (S109), the HD DVD coefficient is set (S110), and then the controller such as the optical pickup and the spindle motor is restarted (S111).

As described above, the size of the DPD track error signal is measured and compared with the DPD reference value C1 to determine the HD DVD in the HD DVD recorder and player. Compared with the conventional HD DVD discrimination method by comparing the reference error value C2 and setting the track error coefficient suitable for the DVD to the coefficient of the tracking error signal, the focusing error signal, and the spindle error signal of the determined DVD. It is not necessary to restart controllers such as optical pickup and spindle motor for control, which shortens the driving time and stabilization time, and eliminates the time required for mechanical operation such as controller stop time of optical pickup and spindle motor. Lead-in time is greatly shortened.

The present invention is not limited to the above-described embodiments, and various changes can be made by those skilled in the art without departing from the gist of the present invention as claimed in the following claims.

As described in detail above, the present invention eliminates the controller driving time of the optical pickup and spindle motor for controlling the focus and the spindle, and the time required for mechanical operation such as stabilization time and stop time, thereby eliminating the lead-in of the DVD disc. This has the advantage of significantly reducing the time.

In addition, the optical disk system capable of recording and / or reproducing all the optical disks of high density and low density has an effect of accurately determining the type of all optical disks.

In addition, the present invention can discriminate DVD discs and HD-DVD discs using an optical system used for general DVD recording / playback, thereby reducing the disc discrimination accuracy and the time required for disc discrimination, and discrimining optical discs in DVD systems. After that, the DVD lead-in time can be shortened by setting a DVD coefficient suitable for a DVD disc and setting a DVD track error coefficient.

Claims (11)

A spindle motor for rotating the optical disc, An optical pickup for irradiating laser light to the optical disc, detecting light reflected from the optical disc, and controlling focus; An RF unit generating a track error signal from a signal input from the optical pickup; The optical disc is a DVD-based optical disc according to the track error signal, and when the optical disc is a DVD-based optical disc, a tracking error signal, a focusing error signal, and a spindle error signal are set as DVD coefficients to determine the optical pickup and spindle motor. Control the driving, When the optical error of the DVD series is determined to be an HD DVD disk by comparing the tracking error signal with a preset reference value, the optical pickup and the spindle motor are stopped and controlled, and the DVD coefficient set above is used as a tracking error signal and a focusing error of the HD DVD. A signal and a microcomputer for controlling driving of the optical pickup and the spindle motor after setting the spindle error signal, When determining whether the optical disc is a DVD-based optical disc, DPD (Differential Phase Detection) track error signal The optical disc is a DVD disc when it exceeds the DPD (Differential Phase Detection) reference value.  DPD (Differential Phase Detection) track error signal And an optical disc is a DVD disc when the track error signal of a push pull (PP) method is equal to or more than a PP (push pull) reference value while being less than a DPD (Differential Phase Detection) reference value. The method of claim 1, And the determined sequence is a DVD sequence including a DVD-R, a DVD-RW, a DVD-ROM, a DVD-RAM, and an HD DVD, and the optical disc coefficient is a DVD coefficient. delete The method of claim 1, And the track error signal is a track error signal of a differential phase detection (DPD) method and a track error signal of a push pull (PP) method. The method of claim 1, The micom has a DPD (Differential Phase Detection) reference value and a PP (Push Pull) reference value set in advance, so that a track error signal of a DPD (Differential Phase Detection) method and a track pull signal of a PP (Push Pull) method are received from the RF unit. And an input unit for comparing the reference value with each reference value. The spindle motor rotates the optical disc, An optical pickup irradiates the optical disk with laser light, detects the light reflected from the optical disk, controls the focus, and an RF unit generates a track error signal with a signal input from the optical pickup, The microcomputer determines whether the optical disc is a DVD-based optical disc according to the track error signal, and when the optical disc is a DVD-based optical disc, sets a tracking error signal, a focusing error signal, and a spindle error signal as a DVD coefficient so that the optical pickup and spindle To control the driving of the motor, When the optical disc of the DVD series is determined to be an HD DVD by comparing the track error signal with a preset reference value, the set DVD coefficient is set as a tracking error signal, a focusing error signal, and a spindle error signal of the HD DVD. Includes a microcomputer to control the re-drive of the spindle motor, When determining whether the optical disc is a DVD-based optical disc, DPD (Differential Phase Detection) track error signal The optical disc is a DVD disc when the DPD (Differential Phase Detection) reference value is higher than  DPD (Differential Phase Detection) track error signal And the optical disc is a DVD disc when the track error signal of a push pull (PP) method is less than a DPD (Differential Phase Detection) reference value or more than a PP (push pull) reference value. delete delete The method of claim 6, And the DVD series optical disc is a DVD series including DVD-R, DVD-RW, DVD-ROM, DVD-RAM, and HD DVD. The method of claim 6, And the track error signal is a track error signal of a differential phase detection (DPD) method and a track error signal of a push pull (PP) method. The method of claim 6, The micom has a DPD (Differential Phase Detection) reference value and a PP (Push Pull) reference value set in advance, so that a track error signal of a DPD (Differential Phase Detection) method and a track pull signal of a PP (Push Pull) method are inputted from the RF. And comparing the respective reference values with each other.

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