JPH0785487A - Optical disk apparatus - Google Patents

Abstract

PURPOSE:To improve handling performance of an optical disk apparatus by preventing a decrease in reading performance of signal information due to an inclination of tracking because of own weight of an objective lens when the apparatus is inclined. CONSTITUTION:The optical disk apparatus is provided with a pickup 22, a slidably moving mechanism for locating the pickup 22 at a designated position of a disk 21, as tracking servo circuit 8 for locating the pickup 22 at an information track of the disk 21, a signal processor 9 for recovering a signal read from the pickup 22, and a system controller 32 for controlling them to reproduce information recorded on the disk. The apparatus is further provided with a main beam and differential amplifier 4 for optically detecting an absolute amount of the inclination of the tracking of the pickup 22, and the controller 32 for driving the moving mechanism on the basis of detection of the absolute amount of the inclination of the tracking.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc device such as a mini disc drive device capable of reproducing information from a disc conforming to the mini disc standard.
In particular, in tracking servo control for locating the pickup on a predetermined track, the laser beam emitted from the pickup to the disk is a three beam including a main beam for reading an information signal and a pair of sub-beams for detecting a tracking error signal. System optical disk device.

[0002]

2. Description of the Related Art In an optical disc device such as a mini disc drive device, tracking servo control is performed in order to capture a predetermined track in order to read various types of information from the disc. Is commonly used.

As shown in FIG. 2 which is an explanatory view of the present invention, the principle of the tracking servo control by this three-beam system is such that a pair of sub-beams (each "E Beam 2 ",
"F beam 3") is arranged and tracking servo control is performed so that the light amounts detected by the respective sub beams are the same, whereby the main beam 1 is localized at the center of the track 20.

That is, in the tracking error signal detection by the above-described three-beam method, the E beam 2, F beam is utilized by utilizing the fact that the reflected light is large in the track 20 portion where information is recorded and the reflected light is small in the portion other than the track 20. The light detection signal from the beam 3 is input to the differential amplifier 5 shown in FIG. A tracking actuator (not shown) of the pickup 22 is driven by a signal obtained by frequency-compensating and gain-compensating the output of the differential amplifier 5, and the track 20 is captured by tilting an objective lens (not shown).
At this time, the tracking inclination of the pickup 22 is limited to about ± 0.4 mm, while the diameter of the disc 21 is 64 mm, so that the entire disc 21 cannot be covered. A slide servo using a mechanism is also used.

On the disk 21, as shown in FIG. 2, address information FM-modulated (carrier frequency is 22.05 kHz) by minute meandering of the track 20 is recorded. This signal is an ADIP signal (ADress In Pre-g
called "roove)", which is the disc 2 for recording and reproducing information
Used for locating track 20 on 1.

Now, the principle of detecting the ADIP signal of the main beam 1 in the pickup 22 will be described with reference to FIG. 3 which is an explanatory view of the present invention.

As shown in FIG. 3, the laser diode 24
The laser light emitted from the collimator lens 25 becomes parallel light, and the half mirror 26 and the objective lens 2
It is irradiated onto the disk 21 through 7. The reflected light from the disk 21 passes through the objective lens 27 again and reaches the half mirror 26. With the half mirror 26, the disk 21
A part of the reflected light from is reflected and reaches the main beam light receiving element 28. The main beam light receiving element 28 is divided into two parts in the width direction of the track 20, and as shown in FIG. 2, each is arranged so that the reflected light from each part of the track 20 can be detected. The levels of the detection signals from the divided light receiving elements RF1 and RF2 change in opposite phases as the track 20 meanders. Therefore, by inputting these to the differential amplifier 4, the ADIP signal Detect.

The output of the differential amplifier 4 is input to the system controller 12 via the ADIP signal processing circuit 11, as shown in FIG. 9, and the position of the pickup 22 is controlled by this. That is, according to the instruction from the system controller 12, the tracking servo circuit 8
However, based on the tracking error signal from the differential amplifier 5, the objective lens 27 of the pickup 22 is servo-driven in the track direction.

The output signal from the tracking servo circuit 8 is also supplied to the slide servo circuit 77. The slide servo circuit 77 performs frequency compensation and gain compensation such as removing an unnecessary frequency band from the tracking servo output, and transmits it to the slide motor 23. Also, the slide servo circuit 77 drives the slide motor 23 when the tracking tilt amount becomes large to some extent by the tracking servo operation by the pickup 22 alone when the tracking servo works in the direction to make the tracking servo output voltage zero. The tilt of the pickup 22 is returned to the vicinity of neutral. A recording signal such as music information recorded on the disk 21 is input to the recording signal processing circuit 9 via the differential amplifier 6, is restored into a music signal by the recording signal processing circuit 9, and is output from the output terminal 10. It is designed to be output to the outside.

In the conventional mini-disc drive device described above, when the track 20 is captured to read the information signal from the disc 21, the relationship between the tilted state of the objective lens 27 in the horizontal state and the respective signals accompanying it is shown. , Figure 1
It is as shown in the left part of the 0 time chart. Here, FIG. 10A shows the tilt of the pickup lens, in which the dotted line shows the neutral state, and the upward direction shows the disk outer peripheral direction.

The objective lens 2 is continuously captured while the track 20 is captured.
When 7 inclines toward the outer circumference, as shown in FIGS. 10C and 10D, the slide servo output level also increases as the DC voltage level of the tracking servo output increases, and when the start voltage level of the slide motor 23 is reached. The slide mechanism operates, the inclination of the objective lens 27 in the outer peripheral direction is canceled, and rather the objective lens 27 is inclined in the inner peripheral direction. As described above, the cycle T at which the slide motor 23 is activated is about 3 to 10 seconds, and is set to be activated when the tracking tilt amount of the objective lens 27 becomes about 50 to 100 μm in order to prevent deterioration of the signal detection performance. It

When the apparatus is installed horizontally as described above, the objective lens 27 is tilted substantially uniformly on the inner and outer peripheral sides with the neutral state as a boundary, and absolute tracking from the neutral state is performed. The amount of tilt is controlled to a minimum.

[0013]

However, in the above-mentioned conventional optical disk device, when the device is installed in a state other than horizontal, the weight of the objective lens 27 causes the tilt in the direction of gravity as compared with the tilt range controlled in the horizontal state. Is added,
There is a problem that the neutral state is not evenly tilted, and as a result, the absolute tilt amount is increased.

That is, normally, as shown in FIG.
Although the disk 21 is in a horizontal state, for example, as shown in FIG.
As shown in FIG. 2A, when the apparatus is installed vertically with the outer peripheral side of the disk 21 facing downward, the objective lens 27 tends to tilt toward the outer peripheral side due to its own weight. At this time, since the tracking servo works so that the position of the main beam 1 becomes the center of the track 20, the position of the main beam 1 does not shift as shown in FIG. However, in order to keep the objective lens 27 at the center, it suffices if the tracking servo output voltage is near zero in the horizontal state, but in such a state, an output voltage that tilts inward toward the inner circumference in order to overcome gravity. Will be needed.

On the other hand, since the slide servo works by using the tracking servo output voltage as an input, if there is such an input voltage that inclines toward the inner peripheral direction, the slide mechanism is operated as shown in FIG. 12 (c). It is driven in the circumferential direction and operates to make the tracking servo output voltage zero. That is, the slide servo operates around a state where the objective lens 27 is naturally inclined due to gravity.

When the apparatus is installed in such a tilted position, as shown in FIG.
As shown in the time chart on the right side of 0 (b) (c) (d), the tracking error signal (EF), the tracking servo output, and the slide servo output show almost no change as compared with the horizontal case. As shown in the time chart on the right side of FIG. 10A, the inclination of the pickup 22 is
The overall inclination shifts toward the outer peripheral direction of the disk 21 by the distance S, and as a result, as shown in the time chart on the right side of FIG.
2) The signal also shifts in the + direction as a whole. This state will be described with reference to FIGS. 13 and 14.

As shown in FIG. 13, when the objective lens 27 is not tilted, the reflected light from the disk 21 passes through the objective lens 27, is limited by the slit 29, and is partially reflected by the half mirror 26. Then, it hits the center of the main beam receiving element 28, and as a result, RF1, RF
The levels of the two detection signals are almost the same. In contrast, Figure 1
As shown in FIG. 4, when the objective lens 27 is tilted in the outer peripheral direction by the distance S, the reflected light impinges on the main beam light receiving element 28, and the levels of the RF1 and RF2 signals become unbalanced. That is, since the range of the reflected light is D to D ', only a little hits the RF1 side. Then,
At the lower level (RF1 in this case), the signal S /
The N ratio deteriorates, and as a result, the S / N ratio of the ADIP signal also deteriorates, so that the address information from the disk 21 cannot be read. For this reason, the conventional mini-disk drive device has to be used in a posture close to horizontal, which is a problem in terms of use conditions of the device.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to prevent deterioration of signal information reading performance due to tracking tilt due to the weight of the objective lens when the apparatus is tilted. However, it is another object of the present invention to provide an optical disk device capable of improving the handling performance.

[0019]

In order to solve the above-mentioned problems, an optical disk apparatus according to the present invention has a pickup for reading information from the disk and a pickup for moving the pickup to a designated position on the disk. A slide movement mechanism, a tracking servo circuit for locating the pickup on the information track of the disc, a signal processing circuit for restoring the signal read from the pickup, and controlling these to reproduce the information recorded on the disc. In an optical disc device including a system controller, an absolute tilt amount detecting means for optically detecting an absolute amount of a tracking tilt in the pickup, and the slide movement based on the absolute amount of tracking tilt detected by the absolute tilt amount detecting means. Provided with slide control means for driving the mechanism It is characterized in that it is.

An optical disk device according to a second aspect of the invention is
In order to solve the above problems, a pickup for reading information from a disc, a slide moving mechanism for moving the pickup to a designated position on the disc, and a tracking servo circuit for locating the pickup on an information track of the disc. In an optical disc device equipped with a signal processing circuit for restoring a signal read from a pickup and a system controller for controlling the signals and reproducing information recorded on the disc, the absolute amount of the tracking tilt in the pickup is optically detected. Is provided for detecting the absolute amount of the tracking tilt by the absolute tilt amount detecting means, and based on both the output of the absolute amount of tracking tilt detected by the tracking servo circuit and the tracking servo output of the tracking servo circuit, Sly to drive It is characterized in that the combination control means.

An optical disk device according to a third aspect of the invention is
In order to solve the above problems, a pickup for reading information from a disc, a slide moving mechanism for moving the pickup to a designated position on the disc, and a tracking servo circuit for locating the pickup on an information track of the disc. In an optical disc device equipped with a signal processing circuit for restoring a signal read from a pickup and a system controller for controlling the signals and reproducing information recorded on the disc, the absolute amount of the tracking tilt in the pickup is optically detected. Is provided for detecting the absolute amount of the tilt, and the output of the absolute amount of the tracking tilt detected by the absolute tilt amount detecting means and the output of the tracking servo of the tracking servo circuit are switched to switch the slide movement mechanism. Slur to drive It is characterized in that the de switching control means is provided.

[0022]

According to the structure of claim 1, the absolute amount detecting means optically detects the absolute amount of the tracking tilt in the pickup, and the slide control means detects the absolute amount of the tracking tilt by the absolute tilt detecting means. Based on this, the slide moving mechanism is driven.

Therefore, in the prior art, the slide servo is driven when the tracking servo output voltage exceeds a predetermined value. Therefore, if the apparatus is installed in a state other than horizontal, it becomes horizontal due to the weight of the objective lens. The tilt is added in the direction of gravity compared to the tilt range controlled by
Although there is a problem that the neutral state is not evenly tilted, and as a result the absolute tilt amount increases, in the present invention, the slide servo can be controlled by the absolute amount of the tracking tilt, This can prevent an absolute increase in the amount of inclination.

As a result, when the apparatus is tilted, it is possible to prevent the deterioration of the signal information reading performance due to the tracking tilt due to the weight of the objective lens, and it is possible to improve the handling performance of the apparatus.

According to a second aspect of the present invention, the combined slide control means is based on both the output of the absolute amount of tracking tilt detected by the absolute tilt amount detection means and the tracking servo output of the tracking servo circuit. , Driving the slide movement mechanism.

Therefore, if the slide servo is controlled only by the output of the absolute amount of tracking tilt detected by the absolute tilt amount detecting means, as compared with the case where the slide servo is driven in cooperation with the tracking servo input signal at the time of a track jump. However, in the present invention, since both the output of the absolute amount of tracking tilt detected by the absolute tilt amount detection means and the tracking servo output of the tracking servo circuit are used together, It is possible to prevent the deterioration of the temperature.

As a result, when the apparatus is tilted, it is possible to prevent the deterioration of the signal information reading performance due to the tracking tilt due to the weight of the objective lens, and to improve the handling performance of the apparatus.

According to the third aspect of the invention, the slide switching control means outputs both outputs based on the output of the absolute amount of tracking tilt detected by the tilt absolute amount detection means and the tracking servo output of the tracking servo circuit. To drive the slide movement mechanism.

Therefore, during normal track acquisition, the slide servo is controlled by the output of the absolute amount of tracking tilt detected by the absolute tilt amount detecting means, while at the time of track jump, the slide servo is output by the tracking servo output of the tracking servo circuit. It becomes possible to control the servo. Therefore, it is possible to improve the slide followability both during the normal track acquisition and the track jump.

As a result, when the device is tilted, it is possible to prevent the deterioration of the signal information reading performance due to the tracking tilt due to the weight of the objective lens, and to improve the handling performance of the device.

[0031]

【Example】

[Embodiment 1] One embodiment of the present invention is shown in FIGS.
The explanation is based on the following. For convenience of explanation, members having the same functions as the members shown in the drawings of the conventional example will be described with the same reference numerals.

In this embodiment, a mini disk drive device is taken as an example of the optical disk device for explanation, but in the case of the mini disk, the type of the optical disk to be handled is an optical disk exclusively for reproducing music software and a user records it. There are two types of magneto-optical disks that can be used. In this embodiment, the magneto-optical disk will be described.

The mini disk drive device of this embodiment is
As shown in FIG. 1, for example, a disc 21 on which various music information is recorded and a pickup 22 for reading various music information are provided, and a slide motor is used to move the pickup 22 to a designated position on the disc 21. 23, and a slide mechanism including a pinion / rack mechanism (not shown) for converting the rotational movement of the slide motor 23 to the horizontal direction.

Further, the minidisk drive device is provided with differential amplifiers 4, 5 and 6 for amplifying various detection signals from the pickup 22. The differential amplifier 4 is for detecting an ADIP signal (ADress In Pre-groove), the differential amplifier 5 is for detecting a tracking error, and the differential amplifier 6 is for detecting a recording signal such as music.

A recording signal such as music from the differential amplifier 6 is input to a recording signal processing circuit 9, is restored to a music signal in the recording signal processing circuit 9, and is output from an output terminal 10 to the outside.

The output of the differential amplifier 4 is input to the system controller 32 via the ADIP signal processing circuit 11, whereby the position control of the pickup 22 is performed. That is, according to the instruction from the system controller 32, the tracking servo circuit 8 causes the differential amplifier 5 to
Pickup 2 based on the tracking error signal from
The objective lens 27, which will be described later in No. 2, is servo-driven in the track direction.

The ADIP detection signal from the differential amplifier 4 is also supplied to the slide servo circuit 7. The slide servo circuit 7 removes an unnecessary frequency band from the detection signal from the differential amplifier 4, that is, frequency-compensates and gain-compensates the signal and transmits it to the slide motor 23. (RF1-RF2) from the pickup 22
The slide servo is operated so that the DC component of the signal is zero.

That is, in the minidisk drive device of the present embodiment, in the detection signal based on the irradiation of the main beam 1 on the track 20 described later, the ADIP signal which is the waviness component of the track 20 is detected from the high frequency region. Then, the recording or reproducing position is detected, and the absolute tilt amount of the pickup 22 is obtained from the low frequency region to control the slide servo.
Therefore, the main beam 1 and the differential amplifier 4 are
It has a function as a tilt absolute amount detecting means for optically detecting the absolute amount of the tracking tilt in the pickup 22.

The operation of the mini disk drive device having the above configuration will be described.

In the mini disk drive device of this embodiment, tracking servo control is performed to capture a predetermined track in order to read various kinds of information from the disk 21, and the 3-beam method is used as this tracking servo control method. It is adopted.

As shown in FIG. 2, the principle of the tracking servo control by the three-beam method is as shown in FIG. ".")
Is arranged and tracking servo control is performed so that the light amounts detected by the respective sub-beams are the same, whereby the main beam 1 is localized at the center of the track 20.

That is, in the tracking error signal detection by the above-mentioned three-beam method, the reflected light is large in the track 20 portion where the information is recorded, and the reflected light is small in the portion other than the track 20. The light detection signal from the beam 3 is input to the differential amplifier 5 shown in FIG. A tracking actuator (not shown) of the pickup 22 is driven by a signal obtained by frequency-compensating and gain-compensating the output of the differential amplifier 5, and the track 20 is captured by tilting an objective lens 27 (not shown) described later. At this time, the tracking inclination of the pickup 22 is limited to about ± 0.4 mm, while the diameter of the disk 21 is 64 mm, so that the entire disk 21 cannot be covered.
A slide servo that uses a slide mechanism that drives the whole is also used.

The mini-disc magneto-optical recording disk includes:
Address information that has been FM-modulated (carrier frequency is 22.05 kHz) by a minute meandering of the track 20 is recorded. This signal is called an ADIP signal and is used to confirm the position of the track 20 on the disk 21 when recording and reproducing information.

Now, the principle of detection of the main beam ADIP signal in the pickup 22 will be described with reference to FIG.

The laser light emitted from the laser diode 24 passes through the collimator lens 25 to become parallel light, passes through the half mirror 26 and the objective lens 27, and is applied to the disk 21. The reflected light from the disk 21 passes through the objective lens 27 again and reaches the half mirror 26. A part of the reflected light from the disk 21 is reflected by the half mirror 26 and reaches the main beam light receiving element 28. The main beam light receiving element 28 is arranged in the width direction of the track 20.
It is divided into two parts, and as shown in FIG. 2, each is arranged so that the reflected light from each part of the track 20 can be detected. Each of the divided light receiving elements RF1
The level of the detection signal from the RF2 portion changes in the opposite phase with the meandering of the track 20, so that the ADIP signal is detected by inputting these to the differential amplifier 4.

On the other hand, as shown in FIG. 1, the output of the differential amplifier 4 is input to the system controller 32 via the ADIP signal processing circuit 11, whereby the position control of the pickup 22 is performed. That is, according to the instruction from the system controller 32, the tracking servo circuit 8
Performs servo drive in the track direction on the objective lens 27 of the pickup 22 based on the tracking error signal from the differential amplifier 5.

The ADIP detection signal from the differential amplifier 4 is also supplied to the slide servo circuit 7. The slide servo circuit 7 removes an unnecessary frequency band from the detection signal from the differential amplifier 4, that is, frequency-compensates and gain-compensates the signal and transmits it to the slide motor 23. The (RF1-RF2) signal from the pickup 22 is transmitted. Operates the slide servo so that the DC component is zero. That is, in the detection signal based on the irradiation of the main beam 1 on the track 20, the track 20 is detected from the high frequency region.
The ADIP signal, which is the undulation component, is detected, and the absolute tilt amount of the pickup 22 is obtained from the low frequency region and is input to the slide servo circuit 7.

When the absolute tilt amount of the pickup 22 becomes large to some extent, the slide motor 23 is driven to return the tilt of the pickup 22 to near neutral.

As described above, the inclination of the objective lens 27 when the track 20 is captured by the absolute inclination amount of the pickup 22 when the mini disk drive device is installed horizontally is as shown on the left side in FIG. As shown in the time chart.

As shown in the time chart on the left side of FIG. 4A, the absolute inclination of the objective lens 27, that is, the inclination of the pickup 22 is such that the amount of inclination of the objective lens 27 increases as the track 20 is continuously captured. Figure 4
As shown in the time chart on the left side of (e), (RF1
-RF2) The DC voltage level of the signal also increases, and the slide servo output level based on that signal also increases (Fig. 4).
(See the time chart on the left side of (d)), the slide mechanism operates when the starting voltage level of the slide motor 23 is reached,
The inclination toward the outer circumference of the objective lens 27 is eliminated, but rather the inclination toward the inner circumference. Therefore, when the mini disk drive is horizontal, the objective lens 27 is in a neutral state (dotted line).
At the boundary, the inner and outer circumferences are tilted substantially uniformly, and the absolute tilt amount is controlled to a minimum.

On the other hand, the time chart in the case where the mini disk drive device is installed at an inclination is as shown on the right side in FIG.

That is, the time chart shown on the right side of the figure shows the case where the mini disk drive device is installed vertically with the outer peripheral side of the disk 21 facing down. As shown in FIG.
Since the slide servo works with the absolute tilt amount of, the objective lens 27 is tilted substantially evenly on the inner peripheral side and the outer peripheral side with the neutral state (dotted line) as a boundary, as in the case of horizontal installation. The tilt amount due to the absolute tilt amount from the neutral state is controlled to the minimum. That is, as shown in FIG. 4C, the tracking servo output has an offset corresponding to the output difference p because it compensates for the inclination of the objective lens 27 due to its weight. The tracking error signal (EF) shows substantially the same output in both the horizontal state and the vertical state, as shown in FIG.

As a result, regardless of the posture of the mini disk drive device, when the absolute tilt amount of the pickup lens becomes large, the slide motor 23 is driven to work to return the tilt to near neutral. It is possible to detect the ADIP signal in the optimum state.

As described above, in the mini disk drive device of this embodiment, the main beam 1 and the differential amplifier 4 optically detect the absolute amount of the tracking tilt in the pickup 22, and the system controller 32 causes the main beam 1 to move. Also, the slide moving mechanism is driven based on the absolute amount of tracking tilt detected by the differential amplifier 4.

Therefore, in the prior art, the slide servo is driven when the tracking servo output voltage exceeds a predetermined value. Therefore, when the mini disk drive device is installed in a state other than horizontal, the weight of the objective lens 27 causes it to move. However, compared to the tilt range controlled in the horizontal state, the tilt is added in the gravity direction, the neutral state is not evenly tilted, and as a result, the absolute tilt amount is increased. In this embodiment, the slide servo can be controlled by the absolute amount of the tracking tilt, and thus the absolute increase in the tilt amount can be prevented.

As a result, when the mini disk drive device is tilted, the deterioration of the signal information reading performance due to the tracking tilt due to the weight of the objective lens 27 is prevented, and the handling performance of the mini disk drive device is improved. It becomes possible.

[Embodiment 2] Another embodiment of the present invention will be described below with reference to FIGS. For convenience of explanation, members having the same functions as the members shown in the drawings of the first embodiment will be designated by the same reference numerals, and the description thereof will be omitted.

The above-described first embodiment has a problem that the followability at the time of track jump is deteriorated. That is, in the conventional mini disk drive device, since the slide servo input signal is obtained from the tracking servo output, the signal for driving the slide servo is the signal of the tracking servo circuit 8 that captures the track 20, and the signal at the time of track jump. And a pulse signal for jumping are input.

Therefore, at the time of track jump, the slide servo is driven by the pulse signal, so that there is an advantage that the followability of the slide servo is improved. However, as in the first embodiment, the slide servo input signal is obtained. If the above is not taken from the tracking servo output, the above effect cannot be obtained, so that the followability at the time of track jump is deteriorated.

More specifically, the tracking servo output and the slide servo output when a track jump is performed to search a designated track position are shown in FIG.
As shown in the time chart of (b). In the figure, the period up to G is the track 20 capture state (tracking servo state), the period G to I is track jumping, the period after I ends the jump, and the track 20 again.
Is the period during which the capture of The period in which the track jump is performed is further divided into a G-H jump start-acceleration period and a G-I jump deceleration-convergence period.

In the first embodiment, since the tracking servo output and the slide servo input are not directly related,
After the track jump, the inclination of the objective lens 27 increases by the jump distance, and an offset voltage is generated in the slide servo output by S'corresponding to the inclination. That is, the slide servo does not operate during the jump, but operates after the offset voltage is generated as a result of the jump, so that it follows that the tracking is slow.

Therefore, if the track jump is continuously performed, the inclination of the objective lens 27 is integrated and becomes large, and AD
Since the reading performance of the IP signal is deteriorated, the track jump cannot be performed very densely, and as a result, the speed of searching the track 20 is slow.

In order to solve this problem, in the mini disk drive device of this embodiment, the output of the differential amplifier 4 and the tracking servo circuit 8 are connected to the input terminal 30 of the slide servo circuit 7 as shown in FIG. The output of is connected. That is, the difference from the first embodiment is that the input signal to the slide servo circuit 7 is a signal obtained by adding the output of the differential amplifier 4 and the output of the tracking servo circuit 8.

Then, the main beam 1 and the differential amplifier 4
The slide movement mechanism is driven on the basis of both the output of the absolute amount of tracking tilt detection and the output of the tracking servo of the tracking servo circuit 8.

A time chart at the time of a track jump in the mini disk drive device having the above structure is
As shown in FIGS. 7A and 7B. In the figure, G
The tracking servo output is input to the slide servo circuit 7 to some extent during the track jump period of ~ I, and as a result, the slide motor 23 is directly driven by the jump waveform, so that the slide followability is improved and the search speed is increased. It is possible to raise.

As described above, the mini disk drive device of the present embodiment is based on both the output of the absolute amount of tracking tilt detection by the main beam 1 and the differential amplifier 4 and the tracking servo output of the tracking servo circuit 8. The slide moving mechanism is driven.

Therefore, if the slide servo is controlled only by the output of the absolute amount of the tracking tilt detected by the main beam 1 and the differential amplifier 4, in comparison with the case where the slide servo is driven in cooperation with the tracking servo input signal at the time of a track jump. As a result, the problem of poor tracking performance arises, but in the present embodiment, both the output of the absolute amount detection of the tracking tilt by the main beam 1 and the differential amplifier 4 and the tracking servo output of the tracking servo circuit 8 are output. Since it is used together, it is possible to prevent the followability from deteriorating.

As a result, when the mini disk drive device is tilted, the deterioration of the signal information reading performance due to the tracking tilt due to the weight of the objective lens 27 is prevented, and the handling performance of the mini disk drive device is further improved. Can be achieved.

In the present embodiment, the optical tracking tilt detection signal and the tracking servo signal are simply added to form the slide servo input signal, but the present invention is not limited to this, and the system controller 42, for example.
Thus, it is also possible to add both signals only during the track jump and use only the optical tilt detection signal during the track acquisition.

[Embodiment 3] The following description will discuss still another embodiment of the present invention with reference to FIG.
For convenience of explanation, members having the same functions as those shown in the drawings of the first and second embodiments will be described as follows.
The same reference numerals are given and the description thereof is omitted.

In the second embodiment, as shown in FIG. 12 (c) which is an explanatory view of the conventional example, there is a slight phenomenon that the slide servo operates around the state where the objective lens 27 is naturally inclined due to gravity. Occur. However, the occurrence of this phenomenon is not as great as in the past, and therefore ADIP
The signal does not become unreadable.

In order to completely solve the problem that the above phenomenon occurs a little, the mini disk drive device of the present embodiment, as shown in FIG. 8, has a switch 31 at the input terminal 30 of the second embodiment. Is provided. Then, the system controller 52 as the slide switching control means switches between the output of the absolute amount of the tracking tilt detected by the main beam 1 and the differential amplifier 4 and the tracking servo output of the tracking servo circuit 7 to perform the slide movement. It is designed to drive the mechanism.

Therefore, while the normal track 20 is being captured, the slide servo is controlled by the output of the absolute amount of the tracking tilt detected by the main beam 1 and the differential amplifier 4, while the tracking servo of the tracking servo circuit 8 is used during the track jump. The output controls the slide servo. Therefore, it is possible to improve the slide followability both while the track 20 is being captured and when the track is jumping.

As a result, when the mini disk drive device is tilted, the deterioration of the signal information reading performance due to the tracking tilt due to the weight of the objective lens 27 is prevented, and the handling performance of the mini disk drive device is further improved. Can be achieved.

[0075]

As described above, the optical disk device according to the first aspect of the present invention includes the absolute tilt amount detecting means for optically detecting the absolute amount of the tracking inclination in the pickup and the tracking inclination amount detected by the absolute tilt amount detecting means. A slide control means for driving the slide movement mechanism based on the absolute amount detection is provided.

As a result, in the past, the slide servo was driven when the tracking servo output voltage exceeded a predetermined value. Therefore, if the device is installed in a state other than the horizontal state, it will be in the horizontal state due to the weight of the objective lens. The tilt is added in the direction of gravity compared to the tilt range controlled by
Although there is a problem that the neutral state is not evenly tilted, and as a result the absolute tilt amount increases, in the present invention, the slide servo can be controlled by the absolute amount of the tracking tilt, This can prevent an absolute increase in the amount of inclination.

As a result, when the device is tilted, it is possible to prevent the deterioration of the signal information reading performance due to the tracking tilt due to the weight of the objective lens, and to improve the handling performance of the device. Play.

As described above, the optical disc apparatus according to the second aspect of the invention is provided with the absolute tilt amount detecting means for optically detecting the absolute amount of the tracking inclination in the pickup, and the tracking inclination by the absolute tilt amount detecting means. The slide combination control means for driving the slide movement mechanism is provided based on both the output of the absolute amount detection of 1 and the tracking servo output of the tracking servo circuit.

As a result, when the slide servo is controlled only by the output of the absolute amount of tracking tilt detected by the absolute tilt amount detecting means, as compared with the case where the slide servo is driven in cooperation with the tracking servo input signal at the time of a track jump. However, in the present invention, since both the output of the absolute amount of tracking tilt detected by the absolute tilt amount detection means and the tracking servo output of the tracking servo circuit are used together, It is possible to prevent the deterioration of the temperature.

As a result, when the device is tilted, it is possible to prevent the deterioration of the signal information reading performance due to the tracking tilt due to the weight of the objective lens, and to improve the handling performance of the device. Play.

As described above, the optical disc apparatus according to the third aspect of the present invention is provided with the absolute tilt amount detecting means for optically detecting the absolute amount of the tracking inclination in the pickup, and the tracking inclination by the absolute tilt amount detecting means. The slide switching control means for switching both the absolute amount detection output and the tracking servo output of the tracking servo circuit to drive the slide moving mechanism is provided.

As a result, during normal track acquisition, the slide servo is controlled by the output of the absolute amount of tracking inclination detected by the absolute inclination amount detection means, while at the time of track jump, the slide servo is performed by the tracking servo output of the tracking servo circuit. It becomes possible to control the servo. Therefore, it is possible to improve the slide followability both during the normal track acquisition and the track jump.

As a result, when the device is tilted, it is possible to prevent the deterioration of the signal information reading performance due to the tracking tilt due to the weight of the objective lens, and to improve the handling performance of the device. Play.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a mini disk drive device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing tracking control by a three-beam method in the mini disk drive device.

FIG. 3 is a diagram showing an AD of the above-mentioned mini disk drive device
It is explanatory drawing which shows the detection principle of IP detection signal.

FIG. 4 is a time chart showing each output signal according to the tilt of the pickup in the mini disk drive device, the left side shows the device in a horizontal state, and the right side shows the device in a vertical state. Further, FIG. 7A is the tilt of the pickup, FIG. 8B is the tracking error signal (EF), FIG.
Indicates a slide servo output, and (e) indicates a (RF1-RF2) signal.

FIG. 5 is a block diagram showing a configuration of a mini disk drive device according to another embodiment of the present invention.

6A and 6B are time charts showing waveforms of tracking servo and slide servo at the time of track jump in the mini disk drive device of FIG. 1, where FIG. 6A shows a tracking drive waveform and FIG. 6B shows a slide drive waveform. It is a thing.

7 is a time chart showing waveforms of tracking servo and slide servo at the time of track jump in the mini disk drive device of FIG. 5, (a) showing a tracking drive waveform, (b) showing a slide drive waveform. Is.

FIG. 8 is a block diagram showing a configuration of a mini disk drive device according to still another embodiment of the present invention.

FIG. 9 is a block diagram showing a configuration of a mini disk drive device, showing a conventional example.

FIG. 10 is a time chart showing each output signal according to the tilt of the pickup in the mini disk drive device, the left side shows the device in a horizontal state, and the right side shows the device in a vertical state. In the figure, (a) is the tilt of the pickup, (b) is the tracking error signal (E
-F) and (c) show tracking servo output, (d) shows slide servo output, and (e) shows (RF1-RF2) signal.

FIG. 11 is an explanatory diagram showing a tracking state of a disc in a horizontal state in the mini disc drive device.

12A and 12B are explanatory diagrams showing a tracking state of a disc in a vertical state in the mini disc drive device, FIG. 12A is a tracking state in which the pickup is tilted by its own weight, and FIG. 12B is a pickup state in FIG. Is a tracking correction, and (c) is a slide correction of the pickup in the state (b).

FIG. 13 is an explanatory diagram showing a detection state of an ADIP detection signal in the horizontal state in the mini disc drive device.

FIG. 14 is an explanatory diagram showing a detection state of an ADIP detection signal in a vertical state in the mini disc drive device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 main beam (tilt absolute amount detecting means) 4 differential amplifier (tilt absolute amount detecting means) 5 differential amplifier 6 differential amplifier 7 slide servo circuit 8 tracking servo circuit 11 ADIP signal processing circuit 21 disk 22 pickup 32 system controller ( Slide control means) 42 system controller (slide combined control means) 52 system controller (slide switching control means)

Claims (3)

[Claims] 1. A pickup for reading information from a disc, a slide movement mechanism for moving the pickup to a designated position on the disc, a tracking servo circuit for locating the pickup on an information track of the disc, and a pickup. In an optical disc device equipped with a signal processing circuit for restoring a read signal and a system controller for controlling these and reproducing information recorded on the disc, an absolute amount of tracking tilt in the pickup is optically detected. An optical disc device comprising: an absolute tilt amount detecting means for performing the above; and a slide control means for driving the slide moving mechanism based on the absolute amount of tracking tilt detected by the absolute tilt amount detecting means. 2. A pickup for reading information from a disc, a slide moving mechanism for moving the pickup to a designated position on the disc, a tracking servo circuit for locating the pickup on an information track of the disc, and a pickup. In an optical disc device equipped with a signal processing circuit for restoring a read signal and a system controller for controlling these and reproducing information recorded on the disc, an absolute amount of tracking tilt in the pickup is optically detected. And a slide for driving the slide moving mechanism based on both the output of the absolute amount of tracking tilt detected by the absolute tilt amount detection means and the tracking servo output of the tracking servo circuit. Combined control means An optical disk device comprising: 3. A pickup for reading information from a disc, a slide moving mechanism for moving the pickup to a designated position on the disc, a tracking servo circuit for locating the pickup on an information track of the disc, and a pickup. In an optical disc device equipped with a signal processing circuit for restoring a read signal and a system controller for controlling these and reproducing information recorded on the disc, an absolute amount of tracking tilt in the pickup is optically detected. And a slide for driving the slide moving mechanism by switching between both the output of the absolute amount of tracking tilt detected by the absolute tilt amount detection means and the tracking servo output of the tracking servo circuit. Switching control hand An optical disk device having a step.