CN1295695C - A slide rail protection device and method for DVD-RAM optical drive track jump control - Google Patents

Abstract

The invention discloses a slide rail protection device and method for DVD-RAM CD driver track jump control, the device includes slide rail end speed controller, heavy track jump controller and slide rail detector; the sliding rail final speed controller is used for providing a first control signal to the driver so as to control the sliding rail final speed when the optical read-write head jumps; the re-track-jump controller is used for providing a second control signal to the track-jump controller so that the track-jump controller controls the driver to drive the optical read-write head to re-jump tracks; the track detector receives the tracking error signal from the preamplifier to detect whether the track is skipped and the signal input of the switching driver.

Description

A slide rail protection device and method for DVD-RAM optical drive track jump control

technical field

The invention relates to a slide rail protection device and method for DVD-RAM optical drive track jump control, in particular to a slide rail protection device and method for DVD-RAM optical drive track jump control using tracking error signals.

Background technique

When the optical drive reads the data on the optical disc, it must move its optical read-write head to different positions to read the data in different tracks on the optical disc. The laser light spot of the reading head can move on different tracks on the optical disc, so as to smoothly read the data on different tracks on the optical disc. General optical discs, such as CDs, DVD-ROMs, etc., all write data on groove (Groove) tracks, while DVD-RAM optical discs can write data on grooves and land (Land) tracks.

Since DVD-RAM discs can write data on grooves and ground tracks, the frequency of the mirror signal (MIRR) used by DVD-RAM disc drives to map disc tracks will be the mirror signal of CD or DVD-ROM discs. twice as much. Therefore, when the DVD-RAM drive is performing a track jump action, the frequency of its mirror signal will be twice the frequency of its tracking error zero-crossing signal (TEZC), so that the DVD-RAM drive cannot perform a track jump like a CD or DVD- The ROM drive uses the mirror signal and the track control signal at the same time as the direction judgment when the track jumps and the hysteresis protection when the track is slid.

Please refer to FIG. 1 . FIG. 1 is a schematic diagram of a conventional DVD-RAM disc drive track jump control architecture. The track jumping architecture 100 mainly receives some signals from the track jumping controller 110 and the tracking controller 120 to control the driver 130 , and then control the action of the optical read-write head 140 . These signals include a speed error signal 151 , a tracking error zero crossing (TEZC) signal 153 , a mirror signal (MIRR) 157 and a tracking error signal 159 . Among them, the track jump controller 110 controls the optical read-write head 140 to track according to the speed error signal 151, the tracking error zero crossing (TEZC) signal 153 and the mirror signal 157, and the tracking controller 120 controls the optical head 140 according to the tracking error signal 159. The read/write head 140 tracks.

However, although the track jump controller 110 can control the optical read-write head 140 to track jump according to the speed error signal 151, the tracking error zero crossing signal 153 and the mirror signal 157, the frequency of the mirror signal 157 is the tracking error zero crossing ( TEZC) signal 153 frequency twice, therefore, the track jump controller 110 cannot simultaneously use the mirror signal 157 and the tracking error zero crossing signal 153 for direction judgment during track jumping and hysteresis protection during track sliding.

In view of this, a sliding rail protection device and method for DVD-RAM optical drive track jump control can effectively control the sliding rail movement and stop the sliding rail movement when the sliding rail movement occurs.

Contents of the invention

The main purpose of the present invention is to provide a slide rail protection device for DVD-RAM optical drive track jump control, which includes a slide rail final speed controller, a heavy jump track controller and a slide rail detector. Wherein, the final speed controller of the slide rail is used for providing the first control signal to the driver to control the final speed of the slide rail when the optical head jumps. The re-jump controller is used to provide a second control signal to the re-jump controller, so that the re-jump controller controls the driver to drive the optical read-write head to re-jump. As for the slide rail detector, it receives the tracking error signal output by the pre-amplifier to detect whether the optical read-write head slides when the track jumps and switches the signal input of the driver.

Another main purpose of the present invention is to provide a sliding track protection method for DVD-RAM optical drive track jumping control, the steps of which include detecting whether an optical read/write head is sliding track when the track jumping ends. If there is a slide rail, then control the optical read-write head to re-jump the rail, and if there is no slide rail, then end.

In a preferred embodiment of the present invention, if the slide rail is used, it is judged whether the final speed of the optical read-write head slide rail is less than a minimum speed limit of the slide rail, and if the terminal speed of the optical read-write head slide rail is less than the minimum speed limit of the slide rail, Then control the optical read-write head to jump the track again, if the final speed of the optical read-write head slide rail is greater than the minimum speed limit of the slide rail, then control the optical read-write head to make it slow down. And after controlling the deceleration of the optical read-write head, it is judged whether the final speed of the optical read-write head is lower than the minimum speed limit of the slide rail. After controlling the optical read-write head to re-jump the track, it is detected whether the optical read-write head is sliding.

Wherein, by detecting the oscillation frequency of the tracking error signal per unit time, it is judged whether the optical pick-up head slides. If the oscillation frequency is too high, the slide is made; In a preferred embodiment of the present invention, a counter is used to count the number of upper and lower half cycles of the tracking error signal per unit time to determine whether the optical head is sliding. As for the control of the final speed of the slide rail of the optical read-write head, it is carried out by using the full-strength control method.

Based on the above, the present invention provides a slide rail protection device and method for DVD-RAM disc drive track jump control, which can effectively control the slide rail movement and stop the slide rail movement when the slide rail movement occurs.

In order to facilitate a further understanding of the features, purposes and functions of the present invention, the utility model will be described in detail below with specific examples in conjunction with the accompanying drawings.

Description of drawings

FIG. 1 is a schematic diagram of a conventional DVD-RAM optical drive track jump control architecture;

Fig. 2 is the schematic diagram of the slide rail protection device of the DVD-RAM optical drive track skip control of the preferred embodiment of the present invention;

Fig. 3 is a schematic diagram of the waveform of the optical read/write head judged by the track detector using the tracking error signal in a preferred embodiment of the present invention;

Fig. 4 is a schematic diagram of the waveform of the slide rail final speed controller controlling the optical read-write head; and

FIG. 5 is a flow chart of the operation of the slide rail protection device for DVD-RAM optical drive track jump control according to a preferred embodiment of the present invention.

Explanation of reference signs: 100 track jumping structure; 110 track jumping controller; 120 tracking controller; 130 driver; 140 optical read-write head; 150 speed curve generator; 151, 251 speed error signal; 153 tracking error zero cross 157 mirror signal; 159 tracking error signal; 210 slide rail detector; 220 rejump rail controller; 230 slide rail final speed controller; 507 steps.

Detailed ways

FIG. 2 is a schematic diagram of a slide rail protection device for track jump control of a DVD-RAM optical drive according to a preferred embodiment of the present invention. As shown in FIG. 2 , the slide rail protection device includes a slide rail detector 210 , a rejump rail controller 220 and a slide rail final speed controller 230 .

In order to detect whether the optical head 240 in the DVD-RAM drive is sliding when the track jump ends, the sliding track detector 210 will use the tracking error signal 251 output by the pre-amplifier 250 as a detection method for detecting whether the optical head 240 is sliding. track. Please refer to FIG. 3 at the same time. FIG. 3 is a schematic diagram of the waveform of the slide rail detector using the tracking error signal to judge the optical pick-up head in a preferred embodiment of the present invention. Because the DVD-RAM disc used by the DVD-RAM optical drive will pre-record the data called embossed data in each sector (sector) header field (Header field) on the track, when it is pre-written, the amount of reflection and the available The writing area is different, and the track and the writable area are just staggered. Therefore, the tracking error signal waveform generated by the optical read/write head 240 when reading and writing DVD-RAM discs will have a high-frequency signal corresponding to the header. . Therefore, when the optical read-write head 240 performs track jumping on the DVD-RAM disc, it will be affected by noise on the waveform of the tracking error signal and produce a track jump when the track jump ends. The sliding track detector 210 of the present invention judges whether the optical read-write head 240 is sliding or not according to the oscillation frequency of the tracking error signal in the detection window per unit time. In a preferred embodiment of the present invention, the detection flags corresponding to the upper and lower half periods of the tracking error signal are counted under a detection window to determine whether the optical read-write head 240 is sliding. If there are too many upper and lower half cycle times of the error signal, it means the sliding rail, otherwise, there is no.

After the slide rail detector 210 detects whether the optical read/write head 240 slides at the end of the track jump, the re-track jump controller 220 can provide new track jump parameters and switch signals to activate the track jump controller 270 to provide control. The signal or the end speed controller 230 of the slide rail provides control signals to control the action of the optical read-write head 240 through the driver 260, so that the optical read-write head can smoothly stop at low speed and Locked.

The final speed controller 230 of the slide rail controls the optical read-write head 240 in a full-strength manner. Please refer to FIG. 4 . FIG. 4 is a schematic waveform diagram of the final speed controller of the slide rail controlling the optical read-write head. When the slide rail detector 210 detects that the optical pick-up head 240 has a slide rail situation at the end of the track jump, the slide rail final speed controller 230 first controls the full force of the driver 260 to hit the optical pick-up head 240 in one direction, which is bang-bang control. If the final speed of the slide rail of the optical read-write head 240 increases without decreasing after hitting with full force in one direction, it means that the direction of the drive is wrong, so that the final speed of the slide rail of the optical read-write head 240 does not decrease, but the opposite direction is changed. , and so on.

Therefore, when the final speed of the slide rail of the optical pick-up head 240 is controlled at a low speed limit, the driver 260 can be controlled by the re-jump track controller 220 to drive the optical read-write head 240 to re-jump the track, so that the optical pick-up head 240 can be re-jumped. When the rail jump ends and the slide rail occurs, it can smoothly stop at low speed and be locked.

As for the operation flow of the slide rail protection device for DVD-RAM optical drive track jump control of the present invention, please refer to Fig. 2 and Fig. 5 at the same time, Fig. 5 is the slide rail protection device for DVD-RAM optical drive track jump control of a preferred embodiment of the present invention operation flow chart. When the optical pick-up head 240 finishes the track jump, it is the beginning of the process, step 501 . Next, the track detector 210 detects the tracking error 251 signal output by the pre-amplifier 250 , which is step 502 . After the track error signal 251 is detected by the track detector 210 , it is possible to determine whether the optical pick-up head 240 has a track track according to the number of upper and lower half cycles of the track error signal 251 under the detection window. This is step 503 .

If no slide rail occurs, then jump from step 503 to step 504, and stop the whole process. If there is a slide rail, then jump from step 503 to step 505 to compare whether the final speed of the slide rail of the optical read-write head 240 is lower than a low speed limit (this is set by the user). If the end speed of the slide rail of the optical read-write head 240 is less than the low speed limit, then jump from step 505 to step 506, and the re-track jump controller 220 provides new track jump parameters and switching signals to reactivate the track jump controller 270, The track jump controller 270 controls the driver 260 to provide a control force to drive the optical read-write head 240 to track jump again. And after the optical pick-up head 240 re-jumps, the slide track of the optical pick-up head 240 is re-detected, this is step 506 and then jumps to step 502 . If the final speed of the slide rail of the optical read-write head 240 is greater than the low speed limit, skip from step 505 to step 507, and use the final speed controller 230 of the slide rail to control the driver 240 to reduce the final speed of the slide rail of the optical read-write head 240. After the end speed controller 230 of the slide rail lowers the end speed of the slide rail of the optical pick-up head 240 by the driver 260, it judges again whether the end speed of the slide rail of the optical pick-up head 240 is less than the above-mentioned low speed limit, and this is step 505. Go to step 507.

Therefore, in the present invention, the slide rail protection for DVD-RAM optical drive track jump control can be accomplished through the above-mentioned device and operation process.

To sum up the above, the present invention proposes a slide rail protection device and method for track jump control of DVD-RAM optical drives. The slide rail detector detects the tracking error signal to determine whether the optical read/write head slides when the track jump ends. Instead of using the mirror signal, the end speed controller of the slide rail can also be used to control the end speed of the optical read-write head when the slide rail occurs, and the optical read-write head slide rail can be controlled by the re-jump controller. When the final speed is lower than the first speed limit, the track jumps again, so that the optical read-write head can stop smoothly and be locked. Therefore, the optical read/write head can effectively control the movement of the slide rail and stop the slide rail motion smoothly when the track jump ends and the slide rail occurs.

The above descriptions are only preferred embodiments of the present invention, but should not limit the scope of the present invention. All equivalent changes and modifications made according to the claims of the present invention will still not lose the gist of the present invention, nor depart from the spirit and scope of the present invention, and all should be regarded as further implementations of the present invention.

Claims (8)

1. A slide rail protection device for DVD-RAM optical drive track jump control, comprising: A slide rail final speed controller, used to provide a first control signal to a driver to control the slide rail final speed when the optical read-write head jumps; A track jump controller, used to provide a second control signal to a track jump controller, so that the track jump controller controls the driver to drive the optical read-write head to jump track again; and A track detector, receiving a tracking error signal output by a pre-amplifier, and according to the oscillation frequency of the tracking error signal in a unit time, to detect whether an optical read-write head is sliding or not when the track jumps Switch the signal input of this driver. 2. The slide rail protection method of a DVD-RAM optical drive track jump control, comprising the following steps: At the end of the track jump, it is detected whether an optical read-write head is sliding according to the oscillation frequency of a tracking error signal in a unit time; and If there is a slide rail, then control the optical read-write head to jump again, and if there is no slide rail, then end. 3. the slide rail protection method of DVD-RAM optical drive track jumping control as claimed in claim 2, wherein also comprises: If the slide rail, judge whether the final speed of the optical read-write head slide rail is less than a minimum speed limit of the slide rail, if the final speed of the optical read-write head slide rail is less than the minimum speed limit of the slide rail, then control the optical read-write head Jump again, if the final speed of the optical read-write head slide rail is greater than the minimum speed limit of the slide rail, then control the final speed of the optical read-write head slide rail. 4. the slide rail protection method of DVD-RAM optical drive track jumping control as claimed in claim 3, wherein also comprises: After controlling the final speed of the slide rail of the optical read-write head, it is judged whether the final speed of the slide rail of the optical read-write head is less than the minimum speed limit of the slide rail. 5. the slide rail protection method of DVD-RAM optical drive track jumping control as claimed in claim 4, wherein also comprises: After the optical read-write head is controlled to re-jump the track, it is detected whether the optical read-write head slides. 6. The sliding track protection method of DVD-RAM optical drive track jumping control as claimed in claim 2, wherein by detecting the oscillation frequency of a tracking error signal within a unit time to determine whether the optical read-write head is sliding, if If the oscillation frequency is too high, the rail will slide, otherwise, the rail will not slide. 7. The sliding track protection method of DVD-RAM optical drive track jump control as claimed in claim 6, wherein a counter is used to count the number of upper and lower half cycles of the tracking error signal in the unit time to judge whether the optical read-write head is rails. 8. The slide rail protection method for DVD-RAM optical drive track jump control as claimed in claim 3, wherein the final speed of the slide rail of the optical read-write head is controlled in a full-strength control mode.

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