JPH03228231A - Tracking offset correction device, tracking error detection device, and tracking controller using said correction/detection devices - Google Patents

Abstract

PURPOSE:To reduce the offset correction value compared with that set at reproduction in order to eliminate the excessive offset correction and to record exactly the informa tion on a center live of a track by providing a correction signal arithmetic means which applies a proper correction coefficient to a tilt detecting signal at recording. CONSTITUTION:In an offset correction signal arithmetic means 50, a sample and hold means 50a samples and holds the output TE of a tracking error computing element 12 in the timing of a flag detecting signal D and obtains the tilt value. A correction signal switch means 50d applies the output of a coefficient unit 50b to an offset elimi nating means 15 in a reproduction state of a control signal R/W and the output of a coefficient unit 50c to the means 15 in a recording state of the signal R/W respective ly. The coefficient multipliers 50b and 50c multiply the sampled and held tilt value by the coefficients Kr and Kw to operate the offset values suited to the recording/ reproducing operations respectively. Thus it is possible to record the information on a center line of a track in a recording state and to reproduce the signals in a large amplitude respectively despite the tilt value of a disk.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an offset correction device, a tracking error detection device, and a tracking control device using the same in tracking control of an optical disk.Tracking offset correction related to conventional technology Although this technology is attracting attention as an essential technology for optical disk devices, the optical pickup is a device that applies track following control to the optical disk.The tracking error signal that serves as the reference is preformatted on the optical disk. However, in general, optical discs are not completely flat and have warps and sagging, so tracking error signals may not be detected correctly. If the track groove and the riding direction are similar to some extent (tilting), the optical axis of the disc reflected light will shift or the light intensity distribution of the disc reflected light will change asymmetrically due to coma aberration. Even though the tracker is scanning the center of the track, an incorrect amount of tracking error may be detected. This is called a tracking offset. Common phenomenon Tracking control is a force that controls the laser beam irradiation position so that the tracking error signal becomes zero (this tracking offset may cause the laser beam to be controlled to a position slightly deviated from the track center line, but in order to avoid this) Although technology for correcting tracking offsets has recently been developed, the following description will not refer to any drawings.An example of the conventional tracking offset correction device described above will be explained below.FIG. 17 shows a block diagram of a conventional tracking offset correction device. In Figure 17, 10
is an optical disk in which a tracking groove 10a and a mirror-like tilt detection flag 10b are formed, and L 1
Reference numeral 1 denotes an optical pickup, which is equipped with a laser light source 11a and a tracking error detection element 11b. Reference numeral 12, which acts as a photoelectric converter, is a tracking error signal calculator, which calculates the difference between the two outputs of the tracking error detection element 11b to obtain a tracking error signal TE. Reference numeral 13 denotes a tilt detection flag identification means, which identifies the tilt detection flag 1.
0b is scanned by the laser beam emitted from the optical pickup 11. The identification signal is also set. 14 is an offset correction signal calculation means, which consists of a sample/hold means 14a and a coefficient unit 14b. The detection flag D is set. The output TE of the tracking error signal calculator when The tracking offset correction device configured as described above operates to remove the offset included in the tracking error signal TE based on the tracking error signal TE. The far-field image when there is no disk tilt can be obtained by taking the difference in the light intensity distribution on the left and right sides of the far-field image of the tracking groove 10a projected onto each of the equally divided elements of the detection element 11b. The situation is shown below. (A), (B), (
C) are -Tp/4, 0, respectively with respect to the track center.
This indicates a state where the track is shifted by 10 Tp/4. "Track center" refers to the center of the tracking groove.

Further, Tp represents the track pitch (distance between adjacent track center lines). As is clear from Fig. 3, the light intensity distribution on the left and right sides of the far-field image changes depending on the displacement of the laser beam from the track center, but the tracking error detection element 11b is installed so that the optical axis of this reflected light comes to the center of division. (L) It is possible to obtain a tracking error signal from the difference between the two. Figure 4 shows the tracking error detection element 11.
The far-field image of the tracking groove projected on b and the laser beam detect a plurality of tracks and the tilt detection flag 10b.
This figure depicts the tracking error signal when the laser beam crosses the tracking groove (arrow in the figure). In Figure 4, the horizontal dashed line represents the zero level, and the vertical dashed line represents the track center line. In the same figure, the tracking error signal always appears on the horizontal wavy line or the vertical wavy line. This is clear from the fact that the tracking error signal becomes zero on the track center line. Therefore, if control is applied so that the tracking error signal becomes zero here, the laser beam will scan the track center line. However, as shown in FIG. 8, when the optical disc 10 is tilted with respect to the optical pickup 11 in a direction perpendicular to the tracking groove 10a, the optical axis will also shift in that direction. As shown in FIG. 5, the far-field image deviates in the direction perpendicular to the detector dividing line, and furthermore, a part of the far-field image goes outside the frame of the objective lens of the optical pickup 11 (so-called vignetting). Therefore, any deviation of the far-field image projected onto the tracking error detection element with respect to the detector dividing line is an offset corresponding to this deviation.As shown in the figure, the tracking error signal at this time is the same as when there is no offset. Tracking error signal (fourth
If we can detect this deviation, we can detect the tilt angle, and by calculating the amount of correction from this, we can cancel the tracking offset.
The tilt detection flag 10b is an area for obtaining this correction signal, and is usually a mirror surface (the tracking error signal obtained from the light reflected by this mirror surface is generated by the beam shift as shown in FIG. 5). Since the tilt detection flag 10b exists alternately with the tracking groove 10a and only exists intermittently, it is necessary to distinguish between the signal strength that detected the tilt and the signal that detected the tracking error. The am-tilt detection flag identification means 13 fulfills this function,
The tilt detection flag 10b is identified by utilizing the fact that the reflectance of the tilt detection flag 10b is higher than that of the part where the tracking groove 10a is formed. anda
Furthermore, after detecting the tilt at the timing of the signal,
The value is held until the next tilt is detected, and the previously detected tilt detection signal continues to be output while the laser beam scans the section where the track groove exists. The sample/hold means 14a samples and holds the tracking error No. 48 TE when the identification signal is on, and further multiplies the sampled and held value by a coefficient, and outputs the correction signal C. If this is subtracted from the tracking error signal TE, the offset will be removed (
For example, C'L (Japanese Patent Application Laid-Open No. 57-199903) Problems to be Solved by the Invention However, there is no time to apply this technology to optical disk drives for recording and playback. Due to the different tracking offsets, the configuration described above has problems such as not being able to sufficiently correct the offset, or causing excessive correction.The above will be explained from a physical perspective.

Conventional offset correction devices (originally designed to cancel DC offset caused by optical axis misalignment, but do not consider offset caused by coma aberration caused by tilt) - The information recording surface of a common optical disc is covered with a thick transparent protective layer. The focused laser beam passes through the protective layer and reaches the information recording surface.
In an ideal state with no tilt, the equiphase wavefront of a focused laser beam is a spherical surface centered on the convergence point. It is well known that the beam is asymmetrically distorted, resulting in coma aberration. When there is coma, the shape of the convergent beam is biased (in the direction of tilt), and therefore its reflected far-field image is also biased in the tilt direction. Figure 6 shows the far-field image of the disk reflected light and the tracking error signal when there is coma aberration.At this time, the optical axis of the laser beam irradiated to the disk is aligned with the center of the track. Comatic aberration causes an asymmetrical distortion of the incident wavefront in the track direction.As a result, the far-field image created by the mutual interference of the diffracted and scattered light also has an asymmetrical light intensity distribution as shown in the figure. Therefore, an offset occurs in this case as well. However, unlike the case due to beam shift, the tracking error signal in this case is not the result of adding a DC offset, but is the result of adding a phase offset as shown in the figure. In other words, the apparent tracking error signal of the plate is symmetrical with respect to the zero level.
Although the zero-crossing point of the tracking error signal is shifted from the track center line, FIG. 7 shows a far-field image and the tracking error signal when both the beam shift and coma aberration caused by tilt are taken into account. The tracking error signal has an overall upward drift.As a result, it can be seen that the track offsets caused by both are canceled out on the track center line (the tracking error signal crosses zero at the intersection of the vertical broken line and the horizontal broken line). ). Therefore, if tracking control (control such that the tracking error signal becomes zero) is applied here, the optical axis will be located almost on the track center line despite the disc tilt. However, this is not necessarily the case with conventional methods. This does not mean that the tracking offset correction described in the example is not necessary. Discussion from the shape of the convergent beam 7110 Figure 9 shows the image when there is no coma aberration. Figure 10 shows the optical profile formed on the disk when there is coma aberration. In both figures (
Although A) represents the electric field intensity distribution profile and (B) represents the power intensity distribution profile, Figure 9 (A)
), the asymmetry of the base of the profile is noticeable due to coma aberration.In the power distribution of Figure 10(B), the difference between the two (with coma and without coma) is Almost nothing 1. % This is because the power distribution (B) has a square relationship with the electric field distribution (A), so the distortion at the base of the profile becomes almost inconspicuous.Here: Electric field intensity distribution and power of laser beam imaging light The reason why both intensity distributions are illustrated is as follows: When reading information recorded on a disk, the electric field intensity distribution of the laser beam imaging light greatly affects the reproduction characteristics.Far field This is because the image is given by a two-dimensional Fourier transform of the recording surface information pattern (including track pattern) on the electric field intensity distribution of the laser beam imaging light. Therefore, due to the influence of coma, the convergent laser beam If the shape of is asymmetrical, this effect will occur.
In A), the base of the convergent laser beam is biased in the tracking direction (perpendicular to the track tangent), so the influence of the tracking direction becomes a problem. Figure 11 shows the displacement of the optical axis center from the track center line. The amplitude of the reproduced signal is plotted with and without coma aberration.The beam is deformed asymmetrically with respect to the track center line due to coma aberration.The optical axis is not always on the track center line. The reproduced signal does not have the maximum amplitude, and the reproduced signal tends to be better if it is slightly off-track (the optical axis deviates from the track center line).The recording characteristics when recording information on a disk are power This is natural due to the nature of optical discs in which information is recorded using heat from a laser. However, in this case, as is clear from Figure 10 (B), the shape of the power distribution of the convergent laser beam is Since there is almost no change, the information will be recorded almost on the center line of the track regardless of some coma aberration.To summarize, the following can be said, but if there is a disc tilt in the tracking direction, beam shift and coma aberration will occur. occurs, and each of them causes a tracking offset.As a result, the two cancel each other out.

At this time, the optical axis is naturally located at the center of the track, and the information is recorded on the track center line.When reproducing information recorded on the track center line, the optical axis does not necessarily scan the track center line. This is not a condition for maximum amplitude playback, and it may be better to add offset compensation so that the optical axis is outside the track center line. In this way, tracking offset due to disk tilt can be When discussing, it cannot be explained simply by the effect of beam shift, but we must consider all aspects of beam shift, coma, and convergent beam shape.1. % At this time, the beam shift and coma aberration tend to cancel each other out.In this case, the tracking offset is influenced by the shape of the converging beam. The electric field distribution shape is important during playback, and the power distribution shape is determined because the electric field distribution shape does not change due to coma aberration.
Tracking offset may not occur during recording. Therefore, if the conventional configuration performs the same offset correction as during playback, an excessive correction offset will be added during recording, resulting in information being misaligned along the center line of the track. The present invention takes into consideration the above-mentioned problem, in which correct recording may not be possible, and provides a tracking offset correction device that performs appropriate correction in each case of recording and reproduction.Means for solving the problem. In order to solve the above problems, the tracking offset correction device of the present invention is provided with a correction signal calculation means for applying an appropriate correction coefficient to the tilt detection signal during recording in addition to the configuration of the conventional example.

Effect of the Invention With the above-described configuration, the present invention can make the offset correction amount during recording smaller than that during playback, and as a result, it is possible to avoid excessive offset correction during recording and to correctly record on the track center line. Hereinafter, a tracking offset correction device according to an embodiment of the present invention will be explained with reference to the drawings. Fig. 2 is a configuration diagram of a tracking offset correction device according to a first embodiment of the present invention. In FIG. 2, 10 is an optical recording medium composed of a tracking groove 10a and a tilt detection flag 10b, and 11 is an optical pickup equipped with a laser light source 11a and a tracking error detection element 11b. 71a 12 is a tracking error signal calculator, and 13 is a tilt detection flag identification means, which are equivalent to those shown in the example. The difference from the example is that in order to obtain the offset correction signal C, an offset correction signal calculation means 50 whose function is switched by the control signal R/W is used. As shown in the figure. In FIG. 1, 50a is a sample and hold means, and 50b and 50c are different coefficients Kr.
, Kw. 50d is a correction signal switching means for selecting one of the outputs of the coefficient multiplier 50b and the coefficient multiplier 50c according to the control signal R/W and outputting it as the offset correction signal C.a Control signal R/W is a flag indicating whether the drive is currently in a recording state or a reproducing state. 15 is an offset removal means, which is similar to the conventional example shown in FIG. 17. From the tracking error signal TE to the offset correction signal C The operation of the tracking offset correction device configured as above will be explained below.
Optical pickup 11, tracking error signal calculator 1
2. The tilt detection flag identification means 13 operates in the same manner as the conventional one. Also, the offset correction signal calculation means 5
0, the sample/hold means 50a samples and holds the output TE of the tracking error calculator 12 at the timing of the flag detection signal, and calculates the tilt amount.
When W is in the reproduction state, the output of the coefficient multiplier 50b is applied to the offset removing means 15, and when the control signal R/W indicates the recording state, the output of the coefficient multiplier 50c is applied to the offset removing means 15.
, 50c calculates the offset amount suitable for playback and recording by multiplying the above sampled and held tilt amount by the coefficients Kr and Kw.a As discussed earlier, if offset correction is not required during recording, i & Kw. = 0 (- The first example is a special case, and it does not mean that offset correction is not necessary during recording in all cases.) There may be some offset depending on the depth and width of the tracking groove. However, considering the mechanism of tracking offset generation,
It is true that the optimal correction offset amount differs between playback and recording, and whether Kw < Kr or not, there is no change in the fact that operational amplifiers with different gains are required for each. In the above example, the force (
As is clear from Figure 7, depending on the tracking polarity, the offset due to coma aberration and the offset due to beam shift are added, and the offset may become larger. The tracking polarity is also related to whether the tracking groove is concave or convex with respect to the direction of laser incidence.
However, in either case, it is possible to deal with this embodiment by setting the gains of the coefficient multipliers 50b and 50c so that Kw>Kr. I haven't discussed signal gain fluctuations (t Buried board) This is because the laser power is higher during recording than during playback.The tracking error signal obtained by the reflected light of this laser beam is also larger during recording than during playback. Although the tracking error signal is made constant by lowering the detection gain during recording, this tracking gain correction is completely different from the gist of the present invention. Even if the amplitude of the tracking error signal is always constant at the stage 12 or at the stage before it, the correction coefficient KrS
Kw does not include this gain correction.As described above, according to this embodiment, by performing appropriate tracking offset compensation during recording and playback, the center of the track is maintained during recording regardless of the tilt of the disk. Information can be recorded on the line, and the signal can be reproduced with maximum amplitude during reproduction. Next, a second embodiment of the present invention will be described. The difference in the configuration from the one shown in FIG. 2 is that a wobbled mark 10c is formed on the optical disk 100 instead of the tracking groove 10a, and furthermore, the tracking detection element 11c provided in the optical pickup 110 is actually a single element. It is a detector, and furthermore, the tracking error signal calculation means 120
The function is to detect the tracking error signal from the wobble mark mentioned above.The other elements are the second one.
The fact that the tracking error signal can be detected from the wobble mark even though it is the same as that shown in the figure is disclosed in US Pat.
Since it is already known from the specification of No. 566.092, the specific method will not be described here. Although it is generally recognized that the feature is that it is not easily affected, this is because in the wobble mark method, the tracking error signal is always zero at the tracking position where the reproduced signal amplitude is maximum.However, coma aberration Tracking control is performed so that the reproduction amplitude is maximized using a laser beam that is asymmetrically distorted in the tracking direction (in other words, ζL). % This is already clear from the explanation so far. Therefore, if tracking control is performed in this manner during recording, information will be recorded at a location deviating from the track center line. (In order to solve this problem, tracking offset correction is performed using the offset correction signal obtained from the tilt detection flag 10b during recording, so that information can be recorded correctly along the track center line.) The configuration of the correction signal calculation means 50 is the same as that shown in FIG. 1, including a sample/hold means 50a and a coefficient unit 50b.
, 50c In this embodiment, correction is unnecessary or LKr=O during playback, and conversely, Kw≠0 to correct offset due to wobbled bits during recording. In the first and second embodiments, the tilt of the disc is detected from the tracking error signal when the convergent laser beam is positioned at the tilt detection flag 10b provided on the recording surface of the optical disc IO. There is no need to provide a tilt detection flag if the force to be detected (if it can be detected by other means).For example, if the optical pickup is equipped with a light source and light receiving element dedicated to tilt detection, it is not necessary to provide a tilt detection flag. In the first embodiment, tracking detection using tracking grooves is not easily affected by tilt during recording, and in the second embodiment (y) Tracking using wobble marks is not affected by tilt during playback. Therefore, by combining the two, it is possible to detect tracking errors that are less affected by tilt during recording and playback.Next, a third embodiment of the present invention will be described. FIG. 13 is a configuration diagram of a third embodiment of the present invention.a In FIG. 13, 101 is an optical disk, and tracking groove 10e
, a wobble mark 10f is formed. Reference numeral 11 is an optical pickup, which is equipped with a laser light source 11a1 and a tracking error detection element 11b, similar to that of the first embodiment. 10e detects the tracking error signal TE; 30 is a tracking error signal calculation means;
This is for identifying the wobble mark 10f, outputting an identification signal, and further collecting a tracking error signal W. 40 is a sample and hold means, which is a tracking error signal W obtained by the tracking error calculation means 30. 61 is a bypass filter, which samples and holds the output at the timing of the identification signal.
62 is a low-pass filter that divides the output signal TE of the tracking error signal calculator 12 into bands, respectively. 70 is an adder, and the signal T is selected.
In this embodiment, both EH and position are added and the output is supplied to the tracking control circuit at the subsequent stage (the low-frequency components including the DC components of the tracking error signal are collected in the tracking groove 10e during recording, and are collected in the tracking groove 10e during playback. Wobble mark lof
In other words, during recording, the switching means 16 connects the output of the low-pass filter 62 and the input of the adder 70. At this time, both the low and high frequencies of the tracking error signal are obtained from the tracking groove 10e. During playback, the c & switching means 16 connects the output of the sample/hold means 40 and the input of the adder 70.The low frequency component of the tracking error signal is obtained from the wobble mark 10f.As a result, especially However, it is not possible to realize a tracking error detection device that does not require offset correction. This is because it is assumed that wobble marks alone cannot secure a sufficient control band including high frequencies.a If the number of wobble marks is sufficient and a sufficient control band can be secured, then as in this example. In addition, in the second and third embodiments, tracking error signal detection using wobble marks is taken as an example. This is limited to the wobble mark method. It does not matter if it operates essentially the same way. For example, two auxiliary beams are prepared for tracking error detection in addition to information recording and playback. Each one tracks the track. Tracking control is applied so that the beam deviates from the center line by an equal distance in the opposite direction.Although the same effect as these embodiments can be obtained even with a so-called 3-beam system, Figures 14 and 15 are different from the book. This is a partial configuration diagram of the fourth embodiment of the invention. In FIG. 14, a laser light source 11e of an optical pickup 111 has three laser beams 110a, 11.
0b, 110c are emitted, of which laser beam 1
Laser beam 10a acts as a beam for recording/reproduction and tracking error detection, and laser beams 110b and 110c act as beams for tracking error detection. As shown in FIG. 15, the optical disc 102 has a tracking groove 10g and address information 10h formed along the track center line.
The laser beam 110a is located on the center line of the tracking groove, and the laser beams 110b and 110c are located on both sides of the tracking groove. The tracking error detection element 1101 that receives the reflected laser beams 110a, 110b, and 110c is divided into two parts, and each output is sent to the tracking error signal calculator 12.
This function is completely equivalent to that shown in Fig. 1, and the tracking error signal TE can be obtained using the push-pull method.
The outputs of 0j and 110 are supplied to the tracking error signal calculation means 31.4) The tracking error signal calculation means 31
40 identifies the address information 10h from these sum signals, outputs an identification signal, and extracts a tracking error signal W from the difference signal. 40 is a sample and hold means, and the tracking error calculation means 31 The obtained tracking error signal W is sampled and held at the timing of the identification signal, and the output is set as W. From this point on, the processing is performed using the same circuit as shown in FIG. It is not necessary to form wobble marks on the disk; it is sufficient to have an isolated mark formed along the center line of the track.
Each sector has a wall where its address information is recorded.
Since the address information can be used, there is no need to provide a special mark.As described above, the present invention has the advantage that by changing the offset correction coefficient during recording and playback, recorded information is centered on the track during recording. It is possible to realize a tracking offset correction device that does not deviate from the line.By detecting tracking error signals using a push-pull method from continuous grooves during recording and using a wobble pattern method during playback, low offset tracking is achieved both during recording and playback. Although it is possible to realize an error detection device, it is also possible to obtain equivalent results without providing wobble marks on the optical disk by using the 3-beam method instead of the wobble mark method.

[Brief explanation of drawings]

Figure 1 is a diagram showing the configuration of essential parts of an embodiment of the present invention. Figure 2 is a diagram showing the configuration of an embodiment of the invention. Figures 3 to 11 explain the mechanism by which tracking offset occurs due to tilt. Figure 12 shows the configuration of the second embodiment of the present invention. Figure 13 shows the configuration of the 34th embodiment of the invention. Figures 14 and 15 show the partial configuration of the fourth embodiment of the invention. Fig. 16 is a supplementary explanation of Figs. 4 to 7. Fig. 17 is a configuration diagram of a conventional example. 10... Optical disk drive 10a... Tracking beam 10b... Tilt detection Flag, 11...
Optical pick-up 'near', 12, 30...Tracking error signal calculator 13...Tilt detection flag identification Heisei 40...-Sample/hold ratio 50
...Offset correction signal calculation means, 50b, 5
0c, ... Coefficient unit 50d ... Correction signal switching hand ratio

Claims (12)

[Claims] (1) A tracking offset correction device for correcting the offset of a tracking error signal generated during tracking control when recording and reproducing information by optical means along an information track formed on a recording medium, comprising: offset detection means for detecting an offset;
offset correction signal calculation means for correcting the detected value obtained by the offset detection means with an appropriate coefficient and outputting the corrected output as a correction signal; and offset removal for removing the offset from the tracking error signal using the correction signal. A tracking offset correction device, comprising: means for calculating the offset correction signal, wherein the appropriate coefficient is different between when reproducing information and when recording information. (2) Tracking offset correction according to claim 1, characterized in that the recording medium is a recording medium in which at least a portion of a tracking groove is continuously formed and an area where the tracking groove is discontinuous is present. Device. (3) The offset correction signal calculation means corrects the detected value obtained from the offset detection means with a first appropriate coefficient when reproducing information, uses the corrected output as a correction signal to remove the offset, and detects the offset when recording information. The detected value obtained by the means is amplified by a second appropriate coefficient, and the amplified output is used as a correction signal to remove an offset, and the second appropriate coefficient is set to be substantially smaller than the first appropriate coefficient. The tracking offset correction device according to claim 1 or 2, characterized in that: (4) The tracking offset correction device according to claim 1, wherein a recording medium on which wobble marks are formed is used as the recording medium. (5) Claim 2, 3 or 4, wherein the intermittent areas formed on the recording medium have a substantially mirror surface.
The tracking offset correction device described. (6) Tracking offset correction that corrects the offset of the tracking error signal that occurs during tracking control when recording and reproducing information by optical means along the information track designated by the wobble mark formed on the recording medium. The apparatus includes an offset detection means for detecting the offset from an area where the wobble mark is not formed, and an offset for removing the offset from the tracking error signal using a detection value obtained by the offset detection means during information recording. A tracking offset correction device comprising a removing means. (7) A tracking error signal detection device for detecting a tracking error signal when recording and reproducing information by optical means on a recording medium in which wobble marks are periodically formed along at least an information track, ,
a first tracking error signal detection means for detecting a tracking error from a light intensity distribution of light reflected or transmitted by an information track of the recording medium; and a second tracking error signal detection means for detecting a tracking error from a peak value of a signal reproduced from the wobble mark. tracking error signal detection means, the output of the first tracking error signal detection means is used as a tracking error signal during recording, and the output of the second tracking error signal detection means is used as a tracking error signal during reproduction. Features of tracking error detection device. (8) A high-pass filter means is provided for filtering high frequency components of the output of the first tracking error detection means, and the output of the first tracking error detection means is used as a tracking error signal when recording information, and when reproducing information, the output of the first tracking error detection means is used as a tracking error signal. 8. The tracking error detection device according to claim 7, wherein the detection output of the second tracking error signal detection means and the output of the high-pass filtering means are added to form a tracking error signal. (9) A tracking error signal detection device for detecting a tracking error signal when recording and reproducing information on a recording medium in which at least a portion of continuous tracking grooves are formed, the device emitting at least three light beams. It comprises a light emitting means and a light receiving element that independently photoelectrically converts each light beam reflected by the recording medium, and from the light intensity distribution of a far field pattern of one reflected light beam among the light beams emitted from the light emitting means. a first tracking error detection means for detecting a tracking error; and a second tracking error detection means for detecting a tracking error from a difference in light intensity of at least two reflected light beams among the light beams emitted from the light emitting means. and high-pass filtering means for filtering high-frequency components of the output of the first tracking error detection means, and when recording information, the output from the first tracking error detection means is used as a tracking error signal, and when reproducing information, the output from the first tracking error detection means is used as a tracking error signal. A tracking error detection device characterized in that the output of the second tracking error signal detection means and the output of the high-pass filtering means are added to obtain a tracking error signal. (10) The recording medium is a recording medium in which a partially continuous tracking groove and address information are recorded, and the second tracking error detection means detects a tracking error signal at least when the existence of this address information is identified. The tracking error detection device according to claim 9, characterized in that: (11) A tracking control device characterized by using any one of the tracking offset correction devices described in claims 1 to 6. (12) A tracking control device characterized by using any one of the tracking error detection devices according to claims 7 to 10.