JPS5911546A - Device for detecting and controlling track jump - Google Patents

Abstract

PURPOSE:To prevent completely mis-recording and double recording caused by an unexpected track jump, by detecting a track jump from a guide track recording information to other guide track out of a track crossing signal, and changing the optical power of a laser light source from the recording state into the non-recording state. CONSTITUTION:When jumping operation is executed, a crossing signal 51 is detected in a tracking error signal similarly the same as a track jump, because an optical spot crosses between pits from a pit of the guide track in the jumping. The cross signal 51 should not be discriminated as track jump. A jumping section pulse 52 and an output of positive/negative comparators 32, 33 are ANDed at an AND gate 56 so as not to discriminate jumping pulses 53, 54 of the jumping section formed with the crossing signal 51 as a track jump signal. The track jump only is detected accurately by using the first leading edge of the pulse of a track jump detecting signal 56 obtained in this way, allowing to reduce the optical power from the recording state into the reproducing state.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a track ejection control device for an optical disc having a guide track for an optical recording recording device.

Description of conventional examples and their problems One example of an optical information recording/reproducing device is to coat or deposit a photosensitive material and rotate an optical tinook.
The optical disc is exposed to light from a laser light source, etc. with a diameter of 1 μm.
The focus is as follows: Irradiating one tiny spot with Y light and modulating its optical output intensity with a recording signal. This results in phase changes and refractive index changes due to irregularities on the optical base, as well as IJ reflectance and transmittance. It is possible to record information such as video (No. 8) or digital (No. 8) in real time as changes in optical properties such as changes in
Ji) A device has been proposed that can record and record information.

In such a device, the cylindrical density of the recording track is increased to 1M, and the partial writing or erasing is carried out in a 1M manner (i.e., a guide track for guiding the track to be recorded is provided in advance in a concentric circle or a spiral shape = 1G guide track). An optical information recording and reproducing device that records information on one track and reproduces information from that track is designed to follow the track (tracking control is not applied). .

For example, the guide track formed on the optical disk may have a concave and convex structure. Information is deposited on the optical disc provided with the guide track and recorded on a recording medium such as an amorphous gold ingot.

Information is stored in the form of holes or local blackening caused by evaporation of the recording medium.

The guide track is identified by the far-field pattern of the laser beam reflected by the guides 1-7 or by the deviation of the light intensity distribution on both sides of the guide 1 book's force direction. This deviation is photoelectrically converted by a photodetector having one or two light receiving sections arranged so that the division boundary is parallel to the direction of the tangential force of the guide track, and is applied to the tracking control means.

An example of an optical disc having a guide track is the one shown in Fig. 1.
I can think of it as a drawing. Figure 1 shows optical tinuku (1)
A small diagram showing part of the circular root of the optical disc (plane RI of υ).
JI! The groove-shaped guide tracks (10a) to (10e) of 41 width W, hitch P, and door length δ are centripetal, or 7, hyral-shaped flea digging. (11a)～(lie
) is applied between the grooves from the -4° light-responsive recording material ζ4 side 1< side to form a record 11I]04. The light beam is focused on the surface R'''C of the light switch.When recording is not possible, tracking control is applied so that the light beam is projected onto the light guide track OO.Recording When the 1i light edge J light output is increased, the light energy of the light spot projected on the Qingqiu guide track address on Dinuk (1) is increased and applied onto the guide track QQ!
The recorded recording material is exposed to light. As a result, the reflectance of the gap on the grooved guide track changes. By detecting this change in reflectance using an optical photoprint with a smaller optical output than during recording, it is possible to reproduce the recorded signal. 04 shows how the recording material in the groove-shaped guide track is exposed to light during H copy recording. This shows 75 cases where the IJ recording material blackened and the reflectance increased by 1. The specific values of the width W, bisona P, and depth d of the guide tracks (10a) to (10e) are IA, for example, width W = 0.6 μm,
Pitch f' = 1.6 μm1, depth δ - 1000 people (H
The optical path length is 1/8 of the optical wavelength of p (3).

FIG. 2 is a diagram illustrating the optical tinook and the scanning locus of the optical beam when track forging occurs.

Optical disc (January ζ is 5t in advance on the track address area (2A) and (2B) as shown in Figure 2 on the unevenness of the groove.
The address signal is cut in advance and used for searching and identifying the required track. There are 12 loading trucks and 1 truck in each area. When making one revolution around the track of sr (ie 1-), IJ [- in one revolution] can only im ts it at the current 1 rack address twice. Ru.

The optical system (formerly 1'IiI axis 14) is shown in Figure 2 as shown in 1, searching for the LC current optical system (3), and setting the track address (2 people) to the IJ student (14). 2. it! IIJ rAJ Starting point (7) Enter the recording mortar from the 2, -] Mari (7J, 1 light iJ+;H
11 laser beams are required to expose the recording medium
ξ is turned on, and the optical beam is tuned in response to the information recording signal phase -1. During track recording, it is contradictory to cause a 1-rack jump from the current track (3) to the current track (3). Possible causes include 1. scratches on the surface.
It is possible that recording is performed by dividing the optical head into sectors 17 and 17.
Even if the blade or stand is subjected to impact, it may fly off. In this way, even if one track jump occurs during recording, the data cannot be output until the address signal (2B) is re-inputted. In other words, in section (6), it is detected that the track is skipped by l/rack.
Information will be recorded in l. What's more inconvenient is that if the track skips (8), it will be recorded from 7.
) has already been recorded on the 1h axis, then the 2ni book Qk row a, l
□ 2 tsuku (i (7) 'jl'Qreportnaichi') will be defeated. Considering that a large number of trucks are to be purchased as a single item when the truck is skipped, all the information on the truck will be written in 2M if the fl is cut off, resulting in the loss of information θ. Even if it is an unrecorded track, it becomes impossible to record on any crossed track (4). The damage caused by the truck being blown away is huge, like this Q).
When the track jumps (! Stop the recording mode instantly and it will not turn off.

Purpose of the present invention +4 In this way, track skipping occurs during recording,
Mistake -) Preventing the information on the recorded track from being destroyed by falsifying one track and recording the track from scratch. It is.

Structure of the Invention The present invention is capable of skipping tracks, reproducing, etc.
4 Loko and 7r (,) Use Hakucho to cross the rack (Light beam or jump out from the recording track at 7 1 shout direction 0) Timing - C
(5 I! issued, recording power at low line 1 error when recording,
It is designed to stop the Nini 111 record from 0j,
Improved reliability of theta OJ on optical discs-V! 7.
t′? /Very important to &,ru.

Embodiment ψ" The track jump detection 11 control system r/f of the present invention is described above (<
An embodiment of the optical recording/reproducing apparatus according to the present invention will be described with reference to FIG. It is rotated by an optical disk (IJ 1.t disk).The light emitted from the semiconductor laser beam is transmitted through a condensing lens.
).

Optical disc (1111 for 11 people)
The light spot is focused on the order of μm. Optical disc (])
Reflected light from 1. The beam is separated by an A/4 plate and a polarizing beam splitter and guided to a two-split photodetector (c).

This optical output path (E) is arranged so that its dividing line is parallel to the track on the optical disk (1).

The tracking error of this two-split photodetector (2) is multiplied by 133
n fl ) Shoe King Shang Hing Control Circuit (c)
to the aperture lens) in a direction perpendicular to the track.

Tracking fII control is being applied. The output 4 is used for reproducing recorded signals and reproducing track addresses.

The light aUU of a semiconductor laser or the like is set to a reproduction power or a recording power by a drive circuit. A recording signal such as a digital signal or bidet No. 48 is generated by the recording signal generation circuit 6.
It is generated by υ and modulates the power of the half-four-body laser when recording 1 g.

FIG. 4 is a diagram showing signal waveforms at various parts when track skipping occurs. (b) to (e) in FIG. 8 are i11! of the signal waveforms (b) to (e) in FIG. 4! It is a measurement point. (a
) is a cross-sectional view along the scanning direction of the light beam, as seen from the light beam. The bell represents the groove track, and i4υ1 represents the flat area between the grooves, each indicating its level.

It corresponds to two figures and one track each. (3) represents the track currently being recorded, and the blackened portion represents the photosensitive state. Track skipping (8) occurs. and (4A)(
4B), and the tracking servo is applied to the destination track (5). FIG. 4(b) shows the output waveform of the tracking error signal, which becomes the transverse signal. In this way, when the light spot leaves the groove track (27A), it is always in the negative direction.When the light spot enters the groove track from the flat δ0υ of the 1C groove, it is always in the positive direction (27B). A tracking error signal is output.This indicates when the light beam cuts from the inside of the Dinuk to the outside.If the light beam crosses from the outside to the inside of the Dinuk, the sign of the error signal is reversed.In the groove track OU. When the tracking servo is applied, the level of the error signal will naturally be around 0, as shown in Figure 4(b).In this way, the level of the l rack (3) currently being recorded will be around 0.
By detecting the rising edge of the waveform (27A) at the moment when the tracking goes off track, it is possible to detect the dropout (8) without causing the recording beam to scan other tracks. The error signal @0) waveform in Figure 4(b) is
The positive comparator 嬬 (Fig. 8) has a zero value (first Q), and the negative comparator Z (Fig. 8) has a negative threshold value. A jump detection signal (■) is obtained. C04 Figure 4 (cJmafkoj,
Since the timing is such that the beam has not entered the first pulse rise of t (d) (j, track jump (8) has occurred and is still in the flat part between the grooves), the power of the semiconductor laser is re-powered at this rise timing (0). If the optical power is reduced,
Erroneous recording can also be prevented in the flat portion between the grooves. @When the pulse in Figure 4 (d) or the pulse in Figure 4 (C) occurs, it means that the track flight υζ has occurred in the inner direction of the light tinuk (1), and the reverse is true. If the pulse in Fig. 4 (C) occurs first, then the first one occurs.

Detect if the track jumps outward.

In Figure 8, the truck fly pal No. 746 in fi54 diagrams (c) and (d) is taken at 01 Kugate ■.

And flip-flop fort with its output? , surround analog gate 01, and record (b generation circuit Ov
The semiconductor laser drive circuit (7) is shut off, and the drive circuit 11f is turned off! The optical power of copper is reduced from recording power to carrier power by a. FIG. 4(e) shows the optical output waveform of the half-body sensor. At the time of recording, the recording signal is adjusted by the PR bias power, and the adjustment is stopped at the rise of the first pulse shown in FIG. 4(d), and the reproduction power is reduced. The CPU (b) confirms the address of the destination track based on the input from the track address Niu circuit.

(to the flip-flop) and wait for detection of the first double jump.

FIG. 5 is a diagram illustrating the occurrence of one rank skip (8) during recording on an optical disc (1) having a spiral guide track. Optical Tinuku (υ Il!I
In order to increase the density, the track spacing must be narrowed. For such a narrow track pitch (0) guide track, it is necessary to reduce pitch feeding unevenness, so spiral/I-' fall cup ink may be applied. When recording data on such a spiral internal hook, it is necessary to record data on the guide track at a specific address from 1' to the end of the hook. In other words, it is necessary to perform a jumping operation in which the light beam is skipped over 1-11 shields for 1 shield can and the light beam is moved to 01 at the beginning of the guide track. The phrase indicates a champagne section where the rope goes around one lap.

ffc the data for this kind of Spira/L/Autumn guide track! Even during recording, unavoidable track skipping as described above may occur. (8) in Fig. 5 shows a track jump, and similarly to Fig. 2, it shows a state where the current track (3) crosses the phase re-druck (4) and the track jump occurs to the destination track < 5J. It shows.

FIG. 6 is a diagram showing the signal waveforms of various parts when track skipping occurs (7T) in the same way as FIG. 4.
e) is a drum shape of the same component as in FIGS. 4(a) to (cl). FIG. 7 is an optical recorder equipped with a track jump detection fiIII control device of an optical dinuque having a full-type internal track. The depiction of Gososan is 1. In Figure 7 (
Lara~(g) is the observation point of the signal waveform <i>-i> in FIG. As described above, ■1 in Figure @6 indicates the first jumping section in which tracking control is continued to be applied to a specific track. (a) is a cross-sectional view of the track in the scanning direction of the light beam. In this way, when a jumping operation is performed, the optical spot crosses from the groove of the guide track to the groove, so it crosses the tracking error large signal (t) (PI No. It is necessary to judge this ``disconnection +-561'' as a track jump and to rub ``f'' (Iyo 1).

(f') in FIG. 6 is synthesized from the driving pulse for champagne and the jumping area 1jii! <Rusui 4
I am writing. This champagne section pano nu iA and 0
0 statement 1. , the output of the 1 stop comparator □□□Q (Fig. 6 (24 (cl')) is used to calculate the jump section formed by the persimmon cutting signal group using AND game it. It is possible to judge the pulse as a track jump signal and make it fL.In this way, the rising edge of the first pulse of the track jump signal can be obtained as shown in Figure 6. Using
Reducing the optical power from the recording state to the raw power
It can be done. The high vanu filter shown in the m7 diagram is used to remove the error voltage that has a period of one revolution during tonking control, and is used as a comparator) (
It is important to ensure that the operations in (c) are carried out reliably.

Even in the case where intermittent recording of a specific track of an optical tinook having a bifulle-shaped guide track is continued, it is possible to detect one gun and one ζ track jump regardless of the jumping operation.

More than the effects of the invention The truck jump detection control device 1 of the present invention is as follows:
If a hook jump occurs unexpectedly during recording, it can be detected instantly with the hook crossing multiplier l, and the recording power can be lowered by 1.
It is possible to prevent erroneous recording. Furthermore, by distinguishing between the l-hook cross-color sequence that is produced during a di-henving operation that has a spifle-like torque and jumps over a track each time the disk rotates, and the cross-traverse line that is caused by the track jump described above, it is possible to create a new full-fledged work. Even for Dinuku, ζ can be used to prevent erroneous recording.

Without the track jump detection control device of the present invention.

1: After the track jump occurs, the tracking jump cannot be detected because the track address is played back.

During recording, the track jumps and gets stuck across the track, thereby destroying important information on the recorded track.
Furthermore, if the destination track is also recorded, it will cause great damage to the information on the disk, but with the present invention, 1. Utilizing the characteristics of the t-tracking transverse light moon, it is possible to detect the timing at which the light beam jumps from the track being recorded by l-hook, and the recording light power can be instantly reduced to the reproduction power. In this way, the present invention can completely prevent erroneous recording and double recording caused by unexpected track jumps, and dramatically improve the reliability of recorded data on optical discs. Can be put down.

[Brief explanation of the drawing]

Figure 1 shows the configuration of an optical disc equipped with a guide track, and Figure 2N shows the trajectory of the light beam when it jumps one rack from the optical disc. ! )+8 is a block diagram of an optical recording and reproducing apparatus equipped with a track skipping control device according to an embodiment of the present invention, FIG. 4 is a diagram showing signal waveforms of various parts when track skipping occurs, and FIG. Figure 5 is a diagram explaining that track skipping occurred during recording on an optical disc that has a spiffle-shaped guide track, jl! , Fig. 6 shows an optical disk having a Nuvairano L[ guide track, and shows the signal waveforms of various parts such as track skipping. r disk 0) f
1 is a configuration diagram of an optical recording/reproducing apparatus equipped with a track jump detection control device; FIG. (1)...Optical disc, (a+ (41(51Q)
S...Guidance track. (No. 8... Track jump section, ?υ... Light source such as semiconductor laser, etc.)... Photodetector 1@... Tracking error signal. (c)...Tracking/jumping control circuit, (
To) competition...positive/negative comparator, θ4) flash...truck jump detection me, f4...Shanghing section, Buddha field -...Shanbing agent Masahiro Morimoto Figure 1, Figure 2] 1" q Figure 5 F A B 9 Mi --”0-Q-M “Q,”) ,,
b.

Claims (1)

[Claims] 1. In an optical recording/reproducing device that focuses a laser light source onto an optical diode having an internal track to record and reproduce information, the guide track on which information is being recorded is used to record information. 1. A track jump detection control device, which detects a track jump to a circular track from a track crossing signal, and changes the optical power of a laser beam from a recording state to a non-recording state. 2. The reflected light beam from the optical disk is arranged parallel to the dividing boundary or the tangential direction of the guide track to split the transmitted light.
The track jumping detection control device according to claim 1, wherein light is received by a split photodetector and a track cutting signal is detected from the output signal thereof. 8. The track jump detection and control device according to claim 1, wherein the optical power of the laser light source in the non-recording state is the same as the power in the reproducing state. 4. The guide track is a spiked track. During a jumping operation in which the optical disk jumps over a track every 1IIliJ rotation, the dividing boundary is arranged parallel to the connecting direction of the guide track. 2. The track jump detection control device according to claim 1, wherein the crossing signal detected from the four output paths of the two divided beams is distinguished from the crossing signal through a shunting interval pulse.