KR19990059566A - Focus search method of optical disc player - Google Patents

Abstract

The disclosed focus search method is to perform the focus search in the DVD mode in addition to the CD mode during the focus search of the optical disk mounted on the deck of the DVDP to accurately perform the presence or absence of the optical disk and focus adjustment.

In the focus search method according to the present invention, when the optical disc is mounted on the deck, the first process of outputting the focus search signal in the CD mode state and performing the focus search according to the focus search signal, and after the focus search according to the first process is performed, A second process of determining whether focus is adjusted; a third process of focus search is terminated and an operation according to a key input by a user; If it is not adjusted, the fourth step of performing the focus search once again by outputting the focus search signal after changing from the CD mode to the DVD mode, and determining whether the focus is adjusted after the focus search according to the fourth process is performed. If the focus is adjusted as a result of the fifth process and the fifth process, the third process is performed and the focus is not adjusted. It consists of a sixth step of outputting a "No Disc" message at the beginning and ending the focus search, so that the focus search can be performed in the CD mode and the DVD mode, so that a special optical disk having a dual-layer structure or an error-prone optical disk is installed or not. Provides the effect of preventing errors caused during determination and focus adjustment.

Description

Focus search method of optical disc player

The present invention relates to a focus search method of an optical disk player, and more particularly, to perform a focus search in a DVD mode in addition to a CD mode during focus search of an optical disk mounted on a deck of a digital versatile disk player (DVDP). The present invention relates to a focus search method of an optical disc reproducing apparatus for accurately determining whether an optical disc is mounted and adjusting focus.

In general, optical discs such as compact discs (CDs), laser discs (LD), video compact discs (VCDs), and DVDs are storage media manufactured so that data such as audio and video can be recorded in a predetermined effective area and reproduced therefrom. In addition to being robust, the recorded data is not easily damaged, and the utilization thereof is gradually increased because of the advantage of being able to reproduce cleanly without noise using a light beam.

FIG. 1 is a schematic block diagram illustrating a focus search of an optical disc player according to the prior art, and the configuration thereof is as follows.

The disc motor 1 rotates the optical disc 2 mounted on the deck (not shown) to be reproduced.

The optical disc 2 is largely divided into three area signal areas, that is, a lead-in area, a program area, and a lead-out area, each signal area being the center of the optical disc. It has data in the form of a projection called a pit along a track that is spirally wound from the outside to the outside.

The lead-in area is commonly referred to as a table of contents (TOC), such as the type of optical disc, the number and size of programs stored on the optical disc, the address of each program, i.e. the position on the optical disc, the start time of each track, the total playback time of the optical disc, and the like. It has data called

The program area has substantial program data, and the lead-out area has data indicating the end of the program.

The objective lens 3 focuses the light beam on one surface of the optical disc 2 and receives the reflected light beam.

The optical pickup 4 converts and outputs a light beam incident by the objective lens 3 into an RF signal, and performs a focus search under the control of the controller 6 to be described later when the optical disc 2 is mounted on the deck.

The RF amplifier 5 amplifies the RF signal input from the optical pickup 4 to a predetermined level, shapes the waveform, and outputs the waveform.

The control unit 6 converts the RF signal input from the RF amplifying unit 5 into a digital signal and outputs a video signal and an audio signal. When the optical disc 2 is mounted on the deck, it is determined whether or not the optical disc 2 is mounted. Outputs a focus search signal for performing focus adjustment.

The motor driver 7 outputs a control signal so that the motor 8 is driven by the focusing search signal input from the controller 6.

The motor 8 is driven according to the control signal output from the motor driver 7 so that the optical pickup 4 performs the focus search.

The flow of the focus search of the optical disc player according to the related art configured as described above will be described in detail with reference to FIG. 2.

First, when the optical disc 2 is mounted on the deck (S1), the focus search signal is output in the CD mode state (S2).

The above-described focus search signal is output to the motor driver 7, and the motor driver 7 drives the motor 8 according to the focus search signal to perform the focus search by the optical pickup 4 (S3). .

Now, the focus search is performed to determine whether the focus is adjusted (S4).

If it is determined that the focus is adjusted, the focus search is terminated and the operation of the device is performed according to the key input by the user (S5).

However, if the focus is not adjusted as a result of the determination, a message "No Disc" is output to the display unit (not shown) of the device (S6).

However, the conventional optical disc player as described above performs the focus search in the CD mode, so there is no problem in focus search of a normal CD. When mounted on the deck, there was a problem that it is not possible to accurately determine whether the optical disk is mounted or to adjust the focus.

Accordingly, an object of the present invention is to provide a focus search method for an optical disk player that can perform focus search in a DVD mode in addition to a CD mode when performing a focus search of an optical disk mounted on a deck of a DVDP to accurately determine whether an optical disk is mounted and to adjust a focus. To provide.

1 is a schematic block diagram illustrating a focus search performed by an optical disc player according to the prior art;

2 is a flow chart showing in detail the flow of the focus search of the optical disc player according to the prior art;

3 is a schematic block diagram illustrating a focus search performed by an optical disc player according to the present invention;

4 is a flow chart showing in detail the flow of the focus search of the optical disc player according to the present invention.

* Explanation of symbols for main parts of the drawings

10: disc motor 20: optical disc

30: objective lens 40: optical pickup

50: RF amplification unit 60: control unit

70: motor driving unit 80: motor

According to an aspect of the present invention, a focus search method of an optical disk player according to the present invention includes a first process of outputting a focus search signal in a CD mode and performing a focus search according to the focus search signal when an optical disk is mounted on the deck; A second step of determining whether the focus is adjusted after the focus search is performed according to the first step; and if the focus is adjusted as a result of the determination of the second step, the third step of performing the operation according to a key input by the user if the focus search is terminated If the focus is not adjusted as a result of the second step and the second step, the fourth step of performing the focus search again by outputting the focus search signal after changing from the CD mode to the DVD mode, and the focus search according to the fourth step After the fifth step of determining whether the focus is adjusted, and if the focus is adjusted as a result of the fifth step Performing a third process, if it is not the focus control is characterized in that configured in the sixth step of outputting a "No Disc" message on the display and ends the focus search.

Hereinafter, a focus search method of an optical disc player of the present invention will be described in detail with reference to the accompanying drawings.

3 is a schematic block diagram illustrating a focus search performed by an optical disc player according to the present invention.

The disc motor 10, the optical disc 20, the objective lens 30, the optical pickup 40, the RF amplifier 50, the motor driver 70, the motor 80 are the same as those described in the configuration of the prior art The detailed description is omitted.

The controller 60 converts the RF signal input from the RF amplifier 50 into a digital signal and outputs a video signal and an audio signal. When the optical disk 20 is mounted on the deck, the control unit 60 determines whether the optical disk 20 is mounted. The focus search signal for performing the focus adjustment is output to the motor driver 70.

In addition, if the focus search of the optical disc 20 mounted on the deck is not performed by the focus search signal initially output, the control unit 60 changes the focus mode from the CD mode set in the control unit 60 to the DVD mode and then focus search. The signal is output again to the motor driver 70 to perform the focus search.

Next, the operation of the focus search method of the optical disk player according to the present invention configured as described above will be described in detail with reference to FIG.

4 is a flow chart showing in detail the flow of the focus search of the optical disc player according to the present invention.

First, when the optical disc 20 is mounted on the deck (S10), the focus search signal is output in the CD mode state (S20).

The above-described focus search signal is output to the motor driver 70, and the motor driver 70 drives the motor 80 according to the focus search signal to perform the focus search by the optical pickup 40 (S30). .

After the focus search is performed as described above, it is determined whether the focus is adjusted (S40).

If the focus is adjusted as a result of the above-described determination (S40), the focus search is terminated and the operation of the device is performed according to the key input by the user (S50).

However, if the focus is not adjusted as a result of the above-described determination (S40), the focus search signal is output again by changing from the CD mode to the DVD mode (S60).

The focus search signal output in the above-described step S60 is output to the motor driver 70, and the motor driver 70 drives the motor 80 according to the focus search signal to focus search by the optical pickup 40. Is performed once again (S70).

After the focus search is performed as described above, it is determined whether the focus is adjusted as in the above-described step S40 (S80).

If the focus is adjusted as a result of the determination of step S80 described above, the focus search is terminated as described above, and the operation of the device is performed according to a key input by the user.

However, if the focus is not adjusted as a result of the above-described determination (S80), the message "No Disc" is output to the display unit of the device and the focus search is terminated (S90).

As described above, according to the focus search method of the optical disk player according to the present invention, when performing the focus search of the optical disk mounted on the deck, if it is determined whether or not the optical disk is mounted and the focus is not adjusted, the mode is changed to the DVD mode. By performing the focus search once again, there is an effect of preventing an error occurring when determining whether or not to mount a special optical disk or an error-providing optical disk having a dual layer structure and focusing.

Claims (1)

A first step of outputting a focus search signal in a CD mode state when the optical disc is mounted on the deck, and performing a focus search according to the focus search signal; A second step of determining whether focus is adjusted after the focus search according to the first step is performed; A third step of performing focus operation and performing an operation according to a key input by a user if focus is adjusted as a result of the determination of the second step; A fourth step of performing a focus search once again by outputting a focus search signal after changing from the CD mode to the DVD mode as a result of the determination of the second step; A fifth step of determining whether focus is adjusted after the focus search according to the fourth step is performed; And As a result of the determination of the fifth process, if the focus is adjusted, the third process is performed, and if the focus is not adjusted, a sixth process of outputting a "No Disc" message to the display unit and ending the focus search is performed. Focus search method of optical disc player.