JPH0770072B2 - Optical information recording / reproducing device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an optical information recording / reproducing apparatus for irradiating an information recording medium with a reproducing beam and a recording beam, and particularly to a push-pull method based on a reflected beam. The present invention relates to an optical information recording / reproducing apparatus having improved tracking performance (accuracy or stability) by correcting the offset or asymmetry of the tracking error signal of No. 1 based on the second tracking error signal by the wobbling method. is there.

[Prior Art] FIG. 7 shows, for example, “No.
11th Optical Symposium Lecture Proceedings "(July 1, 1986)
FIG. 11 is a configuration diagram showing a conventional optical information recording / reproducing apparatus described in “Light Head for Small Write Once (Shinoda, Kondo)” on pages 37 to 40 of Jpn.

In the figure, (1) is a light emitting source including a semiconductor laser or the like that emits a recording or reproducing light beam L1 having different light intensities. Reference numeral (2) is a polarization beam splitter, which transmits a light beam L1 emitted from the light emitting source (1) toward an information recording medium (described later), and a reflected beam L2 from the information recording medium by an error detection system ( It will be reflected toward (to be described later).

(3) is a collimator lens arranged in the transmission-side optical path of the polarization beam splitter (2), and (4) allows the light beam L1 that is collimated by the collimator lens (3) to pass 1 /
4 wave plate, (5) is the light beam L1 that passed through the 1/4 wave plate (4)
An objective lens for condensing light, (6) an information recording medium such as an optical disc irradiated with the light beam L1 passing through the objective lens (5), and (7) a concentric or spiral shape on the information recording medium (6). It is a formed information track.

(8) is a roof prism arranged in the reflection-side optical path of the polarization beam splitter (2), (9) is a concave lens that diffuses the reflected beam L2 that has passed through the roof prism (8), (1
0) is a beam splitter that splits the reflected beam L2 that has passed through the concave lens (9), (11) is a two-split photodetector that receives the reflected beam L2 that is reflected by the beam splitter (10),
(12) is a reflected beam that has passed through the beam splitter (10)
It is a 4-split photodetector that receives L2.

Reference numeral (13) is an operational amplifier that outputs a tracking error signal TE by taking the difference between the output signals of the two-division photodetector (11). I am configuring. Reference numeral (14) is an adder that sums the output signals of the two-division photodetector (11) and outputs the reproduction information signal S.

(15) and (16) are differential amplifiers that take the difference between the two sets of output signals from the 4-division photodetector (12), and (17) is the difference between the outputs of the differential amplifiers (15) and (16). Is a differential amplifier that outputs a focusing error signal FE, and constitutes a focusing error detection system for the light beam L1 together with the roof prism (8) and the four-division amplifier (12).

Next, the operation of the conventional optical information recording / reproducing apparatus shown in FIG. 7 will be described.

The light beam L1 emitted from the light emission source (1) passes through the polarization beam splitter (2), becomes parallel light by the collimator lens (2), and further passes through the 1/4 wavelength plate (4) and is passed through the objective lens (5). The light is focused and a focused spot is formed on the information track (7) of the information recording medium (6).

Then, the light beam L1 reflected by the information recording medium (6)
Becomes a reflected beam L2, and again the objective lens (5), 1 /
The light enters the polarization beam splitter (2) through the four-wave plate (4) and the collimator lens (3). At this time, the reflected beam L2 is reflected by the polarization beam splitter (2) because the polarization direction is rotated by 90 ° by reciprocating the quarter-wave plate (4). Then, the light enters the beam splitter (10) through the roof prism (8) and the concave lens (9), and is split into two photodetectors (11) and four photodetectors (12).
Is divided in the direction of.

Here, the tracking error signal TE is detected by the push-pull method using the two-division photodetector (11), and the focusing error signal FE is the pupil using the roof prism (8) and the four-division photodetector (12). Detected by the screening method. The tracking error signal TE thus obtained
The focusing error signal FE is amplified through differential amplifiers (13) and (15) to (17), respectively, and drives a tracking actuator and a focusing actuator (both not shown).

For the push-pull method and the pupil shielding method, for example, “Principles of Optical D
isc Systems) [Gow Bou-whuis et a
l), Adam Hilger Ltd., 1985
Year], pages 72-73 and 77-79.

The conventional optical information recording / reproducing apparatus obtains, for example, the reproduction information signal S while removing the tracking error and the focusing error of the light beam L1 as described above. Generally, the tracking error signal is obtained by the push-pull method. It is known that the track offset increases when TE is detected.

FIG. 8 shows an optical system for detecting a tracking error when an optical disk with a continuous guide groove is used as an information recording medium (6) described on pages 23 to 30 of the above-mentioned document “Principle of an optical disk system”. It is an explanatory view shown.

In the figure, (3a) is the pupil of the collimator lens (3) that passes the light beam L1, (5a) is the pupil of the objective lens (5) that passes the light beam L1, and (5A) is the objective lens (5 that passes the reflected beam L2. ), A (x, y) is the amplitude distribution of the light beam L1 on the objective lens pupil (5a), and A (x ', y') is the amplitude of the reflected beam L2 on the objective lens pupil (5A). Distribution, Ad (x ', y')
Is the amplitude distribution of the reflected beam L2 on the two-division photodetector (11).

Now, it is assumed that the optical system has no aberration, the focal spot does not defocus, and the information recording medium (6) gives a phase delay to the light beam L1 in proportion to the groove depth of the information track (7). To do. At this time, the amplitude distribution A of the reflected beam L2 reflected by the information track (7) on the objective lens pupil (5A)
(X ', y') is Given in. However, Rn is Where q is the normalized pitch of the information track (7), v ₀ is the normalized track deviation amount, and R (v) is the complex reflectance function of the information recording medium (6).

Further, as shown in the figure, the amplitude distribution Ad (x ', y') on the two-division photodetector (11) is the same as the amplitude distribution A (x ', y') on the objective lens pupil (5A). Since they can be regarded as equal to each other, the photocurrents I ₁ and I ₂ output from the two elements of the two-divided photodetector (11) are respectively expressed by an integration formula in y ′ <0, y ′> 0, I ₁ = ∬ | Ad (x ′, y ′) | ² dx′dy ′ = ∬ | A (x ′, y ′) | ² dx′dy ′ (y ′ <0) …… I ₂ = ∬ | Ad (x ′, y ′) | ² dx′dy ′ = ∬ | A (x ′, y ′) | ² dx′dy ′ (y ′> 0). Then, the tracking error signal TE is
Since it is the difference between the photocurrents I ₁ and I ₂ , it can be expressed as TE = I ₁ −I ₂ .

Here, the variation of the radiation pattern of the light emitting source (1) and the displacement of the objective lens (5) are variations of the amplitude distribution a (x, y) on the objective lens pupil (5a), and the two-division photodetector The positional deviation in (11) is a change in the integral range of the equation and. Therefore, these fluctuations cause an offset in the tracking error signal TE given by the equation.

As described above, the tracking error detection system using the push-pull method is apt to cause a tracking offset due to changes in various elements due to temperature changes and changes over time. This is due to, for example, "Optical Memory Symposium '85 Papers" (Showa 6).
Dec. 0, pp. 181-188, "Composite track wobbling method optical disk memory (Otake, Tsuyoshi,
(Yonezawa) ”.

[Problems to be Solved by the Invention] Since the conventional optical information recording / reproducing apparatus detects the tracking error signal TE by using the push-pull method as described above, the radiation pattern of the light emitting source (1) is Due to fluctuations, displacement of optical components such as the objective lens (5), displacement of the two-divided photodetector (11), etc., an offset occurs in the tracking error signal TE, and stable tracking control cannot be performed. There was a problem.

Further, as described in, for example, Japanese Patent Application Laid-Open No. 61-50228, a second beam obtained by the three-beam method is used to correct the offset of the first tracking error signal (TE) obtained by the push-pull method. An apparatus for adding tracking error signals has also been proposed, but since it still has the drawbacks of the two tracking error detection methods of the push-pull method and the 3-beam method, it cannot be said that the tracking control performance can be sufficiently improved. There was a problem.

Further, for example, as disclosed in Japanese Utility Model Laid-Open No. 61-149128, in order to correct the asymmetry of the tracking error signal (TE), the tracking error signal itself is used to correct the positive / negative amplitude ratio to a target level. A device has also been proposed, but if the symmetry of the tracking error signal is impaired due to dirt on the optical components or the tilt of the information recording medium (disk), it cannot be corrected.
There is a problem that it is not possible to hold the focused spot at the center of the information track.

The present invention has been made in order to solve the above-mentioned problems, and the offset or the relative symmetry of the first tracking error signal by the push-pull method based on the reflected beam is changed to the second tracking error signal by the wobbling method. It is an object of the present invention to obtain an optical information recording / reproducing device capable of performing tracking control with high accuracy or stability by performing correction with certainty.

[Means for Solving Problems] An optical information recording / reproducing apparatus according to the present invention uses a wobbling means for relatively slightly vibrating a focused spot in a transverse direction of an information track and a wobbling method from a reflected beam. Second tracking error signal detecting means for obtaining the second tracking error signal, and correction for generating a correction signal for correcting the offset component or the positive / negative amplitude of the first tracking error signal based on the second tracking error signal. Provided are signal generation means, correction signal storage means for storing the correction signal until the next correction operation, and tracking correction means for intermittently stopping the tracking control and performing the correction operation by the correction signal during the stop period. Is.

[Operation] In the present invention, the first tracking error signal by the push-pull method is changed to the second tracking error signal by the spot wobbling method.
The phase is made the same as the tracking error signal, and the offset component included in the first tracking error signal is corrected or the positive and negative amplitudes are made equal. Then, the tracking servo is performed by using the first tracking error signal with the offset component corrected, so that the tracking control can be performed with high accuracy, and the tracking servo can be performed by using the first tracking error signal after the symmetry correction. By applying this, the stability of tracking control is improved. This makes it possible to maintain the accuracy or stability of the tracking servo for a long period of time even if the light beam is deviated due to deterioration of the optical components over time.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. First
FIG. 1 is a configuration diagram showing an embodiment of the present invention.
(7), (11), (13) and (14) are the same as described above. The focusing error detection system (not shown) has a configuration using the pupil shielding method shown in FIG. 7 or a configuration using a known astigmatism method (not shown).

Reference numeral (18) is a wobbling mirror disposed in the optical path between the collimator lens (3) and the polarization beam splitter (2), which directs the light beam L1 from the light source (1) to the polarization beam splitter (2). , It is possible to selectively perform minute vibrations in the arrow WB direction corresponding to the transverse direction of the information track (7).

Reference numeral (19) is a tracking mirror (19) arranged in the optical path between the quarter-wave plate (4) and the objective lens (5), which directs the light beam L1 toward the information recording medium (6) and also shows an arrow. T
The light beam L1 is rotated in the direction to perform tracking control.

Reference numeral (20) is a focusing actuator, which drives the objective lens (5) in the direction of arrow F perpendicular to the surface of the information recording medium (6) based on the focusing error signal FE (see FIG. 7). Has become.

Further, the wobbling mirror (18), the tracking mirror (19) and the focusing actuator (20) constitute an optical system head H together with the light emission source (1) to the objective lens (5) and the two-divided photodetector (11). ing.

Reference numerals (21) and (22) denote variable gain amplifiers for increasing or decreasing the output signals of the two-division photodetector (11), that is, the photocurrents I ₁ and I ₂ by α times and β times, respectively. ) And each input terminal of the operational amplifier (13).

(24) is a variable power supply that outputs a bias voltage VB, and (25) is a push-pull method that takes the difference between the tracking error signal TE from the differential amplifier (13) and the bias voltage VB from the variable power supply (24). It is a differential amplifier that outputs a first tracking error signal TEP.

Also, variable gain amplifiers (21), (22), variable power supply (24),
The differential amplifiers (13) and (25) are two-division photodetectors (11).
Together with this, it constitutes a tracking error detection system by the push-pull method and serves as a first tracking error signal detection means for obtaining the first tracking error signal TEP by the push-pull method.

(27) is an oscillator for outputting a predetermined frequency signal C to vibrate the wobbling mirror (18), and (28) is a photocurrent
A multiplier that multiplies the reproduction information signal S, which is the sum signal of I ₁ and I ₂ , and the frequency signal C, and (29) is a low frequency band that passes from the DC component to the low frequency component of the output of the multiplier (28). It is a pass filter. The low pass filter (29) removes a frequency component higher than the oscillation frequency of the oscillator (27) from the output signal of the multiplier (28) and outputs a second tracking error signal TEW by the spot wobbling method. ing.

Further, the oscillator (27), the multiplier (28), and the low-pass filter (29) together with the two-division photodetector (11) and the adder (14) generate a reproduction beam (reflected beam L2) by the spot wobbling method. It constitutes a tracking error detection system,
The second tracking error signal TE by the wobbling method
It serves as a second tracking error signal detecting means for obtaining W.

Further, the oscillator (27), together with the wobbling mirror (18), constitutes a wobbling means for slightly vibrating the focused spot on the information recording medium (6) in the transverse direction of the information track (7).

SW1 and SW2 are switches for opening and closing the tracking servo loop by the first tracking error signal TEW, and are connected in series with each other and inserted between the differential amplifier (25) and the tracking mirror (19).

(30) is the first tracking error signal TEP if necessary
And the second tracking error signal TEW, the variable gain amplifiers (21), (22), the variable power supply (24),
An oscillator (27) is a control device for controlling the switches SW1 and SW2, and includes a comparator (31) for comparing the tracking error signals TEP and TEW, a variable gain amplifier (21), (2).
2) and a calculation unit (32) for calculating a correction signal for controlling the variable power supply (24), a control unit (33) for controlling each switch SW1, SW2 and an oscillator (27), a correction signal, etc. And a storage unit (34) for storing.

The control device (30) also includes a wobbling means including an oscillator (27) and a wobbling mirror (18) and a multiplier (2).
8) and a tracking error detection system including a low-pass filter (29), the first tracking error signal TE
A correction unit for correcting the offset component included in P is configured.

That is, in the control device (30), the comparison unit (31) and the calculation unit (32) correct the offset component and the positive / negative amplitude (asymmetry) of the first tracking error signal TEP based on the second tracking error signal TEW. The storage section (34) serves as a correction signal storage section for storing the calculated correction signal until the next correction operation, and the control section (33) and the storage section (34). ) Is a tracking correction means for intermittently stopping the tracking control (tracking servo) and performing a correction operation by the correction signal during the stop period.

The variable gain amplifiers (21) and (22) are connected to the control device (3
The tracking correction means is configured in cooperation with 0) to correct the offset of the first tracking error signal TEP. Similarly, the variable power source (24) cooperates with the control device (30) to configure tracking correction means, and corrects the asymmetry of the first tracking error signal TEP.

FIG. 2 is a perspective view showing a galvanometer mirror used as a wobbling mirror (18) and a tracking mirror (19), for example, (40) is a reflection mirror that changes the direction of the light beam L1, and (41) is a reflection mirror (40 ) Driving a coil, (42) a magnet for exciting the coil (41), (4)
3) is the axis around which the reflection mirror (40) rotates, (44) is a light emitting diode, (45) is the light L of the light emitting diode (44).
Is a slit that allows light to pass through, and (46) is a two-division photodetector that detects the light L that has passed through the slit (45).

Further, the light emitting diode (44), the slit (45) and the two-divided photodetector (46) constitute a rotation angle detection device for detecting the neutral position of the galvano mirror and for electrical damping.
And the rotation angle of the galvanometer mirror is the reflection mirror (40)
The movement of the slit (45) due to the rotation of is detected by detecting the position variation of the light L incident on the two-division photodetector (40).

Next, the operation of the embodiment of the present invention shown in FIG. 1 will be described with reference to FIG. 3 showing the waveforms of the tracking error signals TEP and TEW, taking the case of information recording / reproduction as an example.

Normally, since the oscillator (27) is stopped, the wobbling mirror (18) stands still in the neutral position, and each switch SW1
Since SW2 and SW2 are connected to the contact a side, the tracking servo loop is closed.

Similarly to the above, the reproduction light beam L1 emitted from the light emitting source (1) is reflected by the wobbling mirror (18) through the collimator lens (3), and the polarization beam splitter (2) and the 1/4 wavelength plate ( It is reflected by the tracking mirror (19) through 4) and is further irradiated as a focused spot onto the information track (7) of the information recording medium (6) through the objective lens (5).

The reflected beam L2 reflected by the information recording medium (6) is
The light is received by the two-division photodetector (11) via the above optical system and becomes photocurrents I ₁ and I ₂ , and is further added by the adder (14) to become a reproduced recording signal S.

At this time, the focusing servo loop (see Fig. 7)
Needless to say, is closed, and the focusing actuator (20) is drive-controlled. The first tracking error signal TEP from the operational amplifier (25) is
Negative feedback is provided to the tracking mirror (19) via the a contacts of the switches SW1 and SW2, and tracking control of the focused spot on the information recording medium (6) is performed.

However, since there is a possibility that the first tracking error signal TEP by the push-pull method includes the offset component due to the above-mentioned temperature change and time-dependent change, the following correction operation is performed as necessary.

First, according to an instruction from the control device (30), the switches SW1 and SW2 are switched to the b-contact side as shown in the figure to open the tracking servo loop (that is, the tracking control based on the first tracking error signal TEP is stopped). Control device for the first tracking error signal TEP (30)
To enter. Further, the oscillator (27) is driven to input the predetermined frequency signal C to the wobbling mirror (18) and the multiplier (28).

As a result, the tracking mirror (19) is driven at a frequency sufficiently lower than the oscillation frequency of the oscillator (27) centered on the neutral position. Also, wobbling mirror (1
8) slightly vibrates by the frequency signal C, and moves the condensed spot on the information recording medium (6) in the direction traversing the information track (7).

On the other hand, the reproduction information signal S obtained from the adder (14) is multiplied by the frequency signal C by the multiplier (28) and further passed through the low pass filter (40) to generate the second tracking error signal.
It becomes TEW and is input to the control device (30).

Since the second tracking error signal TEW is obtained by the spot wobbling method, it hardly contains the offset.

The spot wobbling method is described, for example, on pages 73 to 75 of the above-mentioned document "Principles of Optical Disc Systems", and will not be described in detail here.

Further, such tracking control by the wobbling method is stable with respect to variations in the radiation pattern of the light emitting source (1), positional deviation of optical parts and mechanical parts, and the like, for example, in the above-mentioned document “Composite Track Wobbling Method”. Pp.181-188 of "Optical disk memory" (Otake et al.)
Has been reported in. The wobbling method includes a spot wobbling method in which a focused spot on the information recording medium (6) is vibrated and a track wobbling method in which wobble pits are provided on the information track (7). Is exactly equivalent to.

Next, the control device (30) compares the input first tracking error signal TEP with the second tracking error signal TEW as a reference.

First, the average value Vc of the peak (maximum) level Vp and the bottom (minimum) level Vb of the uncorrected first tracking error signal TEP1 including the offset component is obtained from Vc = (Vp + Vb) / 2.

Then, the second tracking error signal TE serving as the reference signal
Zero crossing time t ₁ of rising (or falling) of W
(FIG. 3 see (d)) sought, the voltage level V of the first tracking error signal TEP1 in the zero-crossing time t ₁
The amplification ratio (α / β) of the variable gain amplifiers (21) and (22) is adjusted so that (t ₁ ) matches the average value Vc. Each amplification degree α and β is adjusted by a correction signal from the control device (30).

Generally, since the mixing ratio of the photocurrents I ₁ and I ₂ is changed by adjusting the ratio of α and β, the phase of the AC component of the first tracking error signal TEP1 which is the difference signal between them can be adjusted. At this time, since the two photocurrents I ₁ and I ₂ are signals modulated by the crossing of the information track (7), the phase difference between them is 90 ° to 180 °.

By thus matching the voltage level V (t ₁ ) at the zero crossing time t ₁ with the average value Vc, the phase of the first tracking error signal TEP1 matches the first tracking error signal TEP2 with the second tracking error signal TEW. (See FIG. 3 (b)).

Since the average value Vc of the first tracking error signal TEP2 is not zero, the positive and negative amplitudes are subsequently corrected (Fig. 3 (c)).
reference). That is, by the correction signal from the control device (30),
Bias voltage VB at the same level as average value Vc
4) to output. As a result, the differential amplifier (25) outputs the first tracking error signal TEP3 (see FIG. 3 (c)) having an average value of zero.

In this way, when the first tracking error signal TEP having the same phase as the second tracking error signal TEW and the DC component corrected to zero is obtained, the control device (30) again switches the switches SW1 and SW2 to the a-contact. The tracking servo loop is closed by switching to the side and the normal information recording / reproducing operation state is restored. At this time, the correction signals and the like required for adjustment calculated in the control device (30) are stored in the storage unit (3
Held in 4).

In the above embodiment, the first tracking error signal TEP
Both the offset and the asymmetry are corrected. However, even when only the offset or the asymmetry is corrected, by using the second tracking error signal TEW by the wobbling method, the tracking control is performed as described above. It goes without saying that reliability is improved.

In addition, a wobbling mirror (1
8) is provided separately from the tracking mirror (19), but since the wobbling mirror (18) is driven only during the correction operation, as shown in FIG.
The wobbling function can also be used for 9).

In this case, instead of omitting the wobbling mirror (18), the oscillator (27) and controller (30) and switch SW2
An adder (50) is inserted between the contact b and the contact b. And
In the correction operation, the b contact is selected as shown in the figure,
The tracking mirror (19) is driven by the sum of the wobbling frequency signal C supplied from the oscillator (27) and the information track crossing signal supplied from the control device (30).

Although the wobbling means vibrates the irradiation light beam L1 slightly, the wobbling means may vibrate the information recording medium (6) side slightly, as shown in FIG.

In this case, the wobbling mirror (18) is omitted and one switch SW1 is omitted, but a standard disc piece (6 ') for adjustment having an information track (7') of the same structure as the information recording medium (6). And an actuator (51) for driving the standard disk piece (6 '). Then, during the correction operation, the standard disk piece (6 ') is slightly vibrated in the direction of arrow WB by the output of the adder (50), and during the normal reproduction operation, the light beam L1
Is irradiated onto the information recording medium (6).

Further, in order to match the phase of the first tracking error signal TEP with the second tracking error signal TEW, variable gain amplifiers (21) and (22) as correction means are provided, and the amplification degrees α and β are adjusted to obtain two values. Although the mixing ratio of the photocurrents I ₁ and R ₂ was adjusted, as shown in FIG.
1) may be moved and adjusted in the transverse direction of the information track (7).

In this case, instead of omitting the variable gain amplifiers (21) and (22), an actuator (55) for moving the two-divided photodetector (11) is provided, and a correction signal from the control device (30) is provided. Is applied to the actuator (55).

As described above, according to the present invention, the wobbling means for slightly vibrating the focused spot in the transverse direction of the information track, and the wobbling method for obtaining the second tracking error signal from the reflected beam by the wobbling method. 2 tracking error signal detecting means, correction signal generating means for generating a correction signal for correcting the offset component or the positive / negative amplitude of the first tracking error signal based on the second tracking error signal, and the correction signal A correction signal storage means for storing even the correction operation and a tracking correction means for intermittently stopping the tracking control and performing a correction operation by the correction signal during the stop period are provided, and the first tracking error signal is changed to the second tracking error signal. The offset component is corrected by setting the same phase as the -Since the positive and negative amplitudes of the signals are made equal, an increase in offset component and asymmetry due to temperature fluctuations and temporal fluctuations can be suppressed, and optical information recording that can perform tracking control with high accuracy or stability There is an effect that a reproducing device can be obtained.

[Brief description of drawings]

FIG. 1 is a structural view showing an embodiment of the present invention, FIG. 2 is a perspective view showing the structure of a wobbling mirror and a tracking mirror in FIG. 1, and FIG. 3 is a tracking error according to an embodiment of the present invention. Waveform diagrams showing signals, FIGS. 4 to 6
FIG. 7 is a partial configuration diagram showing different embodiments of the invention, FIG. 7 is a perspective view showing a conventional optical information recording / reproducing apparatus, and FIG. 8 is a tracking error detecting method using a push-pull method and a pupil shielding method. It is explanatory drawing which shows the optical system. (1) ...... Light source, (5) ...... Objective lens (6) ...... Information recording medium, (7) ...... Information track (11) ...... 2-division photodetector, (14) ...... Adder ( 18) …… Wobbling mirror (19) …… Tracking mirror (21), (22) …… Variable gain amplifier (24) …… Variable power supply, (25) …… Differential amplifier (27) …… Oscillator, (28 ) …… Multiplier (29) …… Low-pass filter (30) Controller, SW1, SW2 …… Switch L1 …… Light beam, L2 …… Reflected beam TEP …… First tracking error signal TEW …… Second Tracking error signal In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A light beam emitted from a light emitting source is focused on an information recording medium by an objective lens to form a focused spot for recording or reproduction on an information track of the information recording medium, and In an optical information recording / reproducing apparatus that performs tracking control of the light beam based on a first tracking error signal obtained by a push-pull method from a reflected beam reflected by an information recording medium, Wobbling means for relatively slightly vibrating in the transverse direction, second tracking error signal detecting means for obtaining a second tracking error signal from the reflected beam by a wobbling method, and based on the second tracking error signal The offset component or the positive / negative amplitude of the first tracking error signal is corrected. Correction signal generation means for generating the correction signal, correction signal storage means for storing the correction signal until the next correction operation, and intermittently stopping the tracking control to perform the correction operation by the correction signal during the stop period. An optical information recording / reproducing device, comprising: