JP2000090448A - Method and device for detecting vibration of optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the setting of a detection reference and to improve accuracy and operability by detecting the displacement of a relative distance between a pickup chassis structure and a casing structure, determining the electrical signal corresponding to a detected distance displacement quantity, processing the determined electric signal and detecting the generation of vibration. SOLUTION: This method directly measures the displacement quantity of the distance between a micromagnet 24a constituting a displacement detector and a Hall sensor 24b and, therefore, enables the practicable and intuitive setting of circuits. Further, the pickup chassis structure itself has natural frequencies and, therefore, there is no need for considering the vibration frequencies and the easy observation is possible. The obtaining of the output of 4 times proportional to the square of the distance is made possible by the physical properties of the micromagnet 24a and Hall sensor 24b. The large vibration displacement may be embodied with higher accuracy by the discrimination from the low level vibration when a comparator 26 is used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk device such as a CD-ROM, and more particularly, to a method and an apparatus for detecting vibrations.

[0002]

2. Description of the Related Art Conventionally, an optical disk device, in particular, a CD-R
In the field of the OM drive mechanism, mechanical vibration that propagates to the outside becomes a problem as the rotational speed of the disk increases.

Various methods are conceivable as means for preventing this vibration propagation. That is, the method of preventing the propagation of the vibration includes a method of confining the vibration of the entire CD-ROM drive mechanism, a method of detecting the vibration and reducing the rotational speed at a certain stage, and a method of balancing the disk system. For example, there is a method for preventing vibration.

[0004]

As a conventional representative vibration detection method, there is a method using a vibration sensor to which ceramic technology is applied. This utilizes the fact that a vibration sensor attached to a vibrating structure itself generates an electrical signal by vibrating, and this electrical signal is subjected to vibration in a control system via amplifying means or the like. Is to inform you that

That is, in the conventional system, as shown in FIG. 1, in a CD-ROM device in which a printed circuit board 13 is mounted on the bottom of a housing 12 provided with a pickup chassis 11 on which a pickup system is mounted, as shown in FIG. By arranging a ceramic vibration sensor 14 as shown in FIG. 1 in a hatched portion on the printed circuit board 13 in FIG. 1, an electric signal from the ceramic vibration sensor 14 is transmitted through a sensor amplifier 15 and a comparator 16 as amplifying means. hand,
This is to notify the CPU 17 as a control system that the vibration is occurring, and it is common to observe the vibration itself of the structure in the CD-ROM device.

In this case, the determination by the CPU 17 is as follows. The analog waveform SIG-A from the sensor amplifier 15 as shown in FIG. −
Generally, it is determined to be B.

After the electric signal from the ceramic vibration sensor 14 passes through a sensor amplifier 15 as amplifying means, a digital waveform obtained by AD-converting the analog waveform by an AD converter is used to judge the size and cycle by a CPU. Sometimes used to do so.

However, since these vibration sensors have directionality, the output (vibration waveform) greatly changes depending on the place where the vibration sensor is attached and the difference in the posture of the attached structure. In addition, since this type of sensor is a method of detecting acceleration in principle, it is sensitive and at the same time, its output greatly changes depending on the vibration mode and direction of the attached structure.

[0009] Therefore, as a conventional representative vibration detection method using a vibration sensor to which ceramic technology is applied, since the principle is to detect the acceleration, the setting of the detection reference is delicate and the accuracy is low. There is a problem that it is difficult to put out.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method and an apparatus for detecting vibrations of an optical disk apparatus, which can easily avoid the above problems and improve accuracy and usability. Aim.

[0011]

According to the present invention, in order to solve the above-mentioned problems, there are provided: (1) a pickup chassis structure for supporting a pickup mechanism for recording / reproducing information on / from an optical disk; In an optical disc device including a rotating drive mechanism, a housing structure integrally supporting the pickup chassis structure and the drive mechanism, a relative position between the pickup chassis structure serving as a vibration source and the housing structure A step of detecting a distance displacement to obtain an electric signal corresponding to the detected distance displacement amount, and a step of processing the obtained electric signal to detect the occurrence of vibration;
A vibration detection method for an optical disk device, comprising:

According to the present invention, in order to solve the above-mentioned problems, there are provided (2) a pickup chassis structure for supporting a pickup mechanism for recording / reproducing information on / from an optical disc, and In an optical disc apparatus including a pickup feeding mechanism for moving in a radial direction, a driving mechanism for rotating the optical disc, and a housing structure for integrally supporting the pickup chassis structure, the pickup feeding mechanism and the driving mechanism, Detecting a displacement of a relative distance between the pickup chassis structure serving as a source and the housing structure to obtain an electric signal corresponding to a detected distance displacement amount, and processing the obtained electric signal. Detecting the occurrence of vibration by the vibration detection of the optical disc device. A method is provided.

According to the present invention, in order to solve the above-mentioned problems, (3) a pickup chassis structure for supporting a pickup mechanism for recording / reproducing information on / from an optical disk, and a drive mechanism for rotating the optical disk And an optical disk device including a housing structure integrally supporting the pickup chassis structure and the driving mechanism, wherein a displacement of a relative distance between the pickup chassis structure serving as a vibration source and the housing structure is determined. A distance displacement detecting means for detecting and obtaining an electric signal corresponding to the detected distance displacement amount; and a vibration generation detecting means for processing the electric signal obtained by the distance displacement detecting means to detect the occurrence of vibration. A vibration detection device for an optical disk device, comprising:

According to the present invention, in order to solve the above problems, there are provided: (4) a pickup chassis structure for supporting a pickup mechanism for recording / reproducing information on / from an optical disc; In an optical disc device including a pickup feeding mechanism for moving in a radial direction, a driving mechanism for rotating the optical disc, and a housing structure for integrally supporting the pickup chassis structure, the pickup feeding mechanism and the driving mechanism, A distance displacement detecting means for detecting a displacement of a relative distance between the pickup chassis structure serving as a source and the housing structure to obtain an electric signal corresponding to a detected distance displacement amount; Vibration generation detecting means for processing the electrical signal obtained to detect the generation of vibration,
A vibration detecting device for an optical disk device, comprising:

According to the present invention, in order to solve the above problems, (5) the distance displacement detecting means is provided on one of the pickup chassis structure and the housing structure and on the other. (3) or (4), wherein the vibration detection device for an optical disk device is provided.

According to the present invention, in order to solve the above problems, (6) the distance displacement detecting means is provided on one of the pickup chassis structure and the housing structure and on the other. (3) or (4), wherein the vibration detecting device for an optical disk device is provided.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 4 is a plan view showing a configuration of a main part of a CD-ROM device as an optical disk device to which the present invention is applied.

That is, as shown in FIG. 4, a pickup mechanism 20a for recording / reproducing an optical disc in an optical disc apparatus, a pickup feed motor 20b as a feed mechanism for moving the pickup mechanism 20a in a radial direction of the disc, and an optical disc. The pickup chassis structure 21 on which the disk motor 20c as a drive mechanism for rotating the pickup chassis is mounted is a pickup chassis support piece 22 formed in a cutout portion of a housing structure 23.
In this configuration, the displacement that appears as vibration (shake) in the left-right direction (arrow L) in the drawing is the largest. Easy to understand.

Therefore, the magnitude of the vibration can be translated into the magnitude of the displacement of the pickup chassis structure 21 with respect to the housing structure 23 in the L direction. Therefore, the structure shown in FIG. Then, the minute magnet 24a and the hall sensor 24b as the displacement detector 24 are arranged to face each other at a predetermined distance x.

The output from the Hall sensor 24b in the displacement detector 24 is converted into an analog signal by an electric signal from the Hall sensor 24b via a sensor amplifier 25 as an amplifying means by the configuration shown in FIG. Is generally taken out and processed, and the configurations of the amplifying means and the comparator are equivalent to those in FIG.

That is, the judgment by the CPU 27 is as follows: the analog waveform from the sensor amplifier 25 is discriminated by the comparator 26 at a certain threshold value.
It is general to determine as a pulsed waveform.

However, in the present embodiment, as shown in FIG.
Since the displacement of the distance between the hole sensor 4a and the Hall sensor 24b is directly measured, the circuit setting is performed based on the acceleration (G value) detected by using the ceramic vibration sensor as in the related art. Rather, the circuit can be set practically and intuitively, which is easy.

Further, since the pickup chassis structure 21 itself has a natural vibration, it can be easily inferred that it is not necessary to consider a vibration frequency unlike a conventional ceramic vibration sensor.

Also, as shown in FIG. 7, when the generated vibration level is 1, while the output of the conventional system and the output of the present embodiment are each set to 1, if the vibration level is 2, the conventional system Although the output is merely doubled, in the present embodiment, due to the physical properties of the minute magnet 24a and the Hall sensor 24b constituting the displacement detector 24,
It is possible to obtain an output four times in proportion to the square of the distance.

That is, in the present embodiment, large vibrations are reliably detected and minute vibrations are not detected due to the physical properties of the minute magnet 24a and the Hall sensor 24b constituting the displacement detector 24. It means nothing is possible.

Moreover, since a large vibration (displacement) results in a larger output, when the comparator 26 is used,
Of course, the value AD converted by the AD converter is directly
Also in the case where the determination is made by U27, the distinction from the low-level vibration can be realized with higher accuracy.

Further, by differentiating this displacement, speed detection and acceleration detection are also possible, and it is a feature of the present invention that the application range is wide. Needless to say, this embodiment is merely an example.

That is, as a modification of this embodiment,
As shown in FIGS. 8 and 9, instead of the minute magnet 24 a and the hall sensor 24 b constituting the displacement detector 24,
Even if the LED 24d and the photodetector 24e are used, in principle, vibration can be detected in the same manner as in the case of the minute magnet 24a and the Hall sensor 24b.

As described above, as the displacement detector 24, the LED is used.
24d and the photodetector 24e, the output from the photodetector 24e is low.
The detection accuracy (separation accuracy) is proportional to the square of the distance between the ED 24d and the photodetector 24e.
4, the same effect as when the minute magnet 24a and the hall sensor 24b are used can be obtained.

The present invention is not limited to a single set of displacement detectors. It is also an effective method to use a plurality of sets and increase the directionality. Also, the mounting place is not limited to the position of the embodiment, but should be appropriately mounted on a portion to be observed.

As described above, in the embodiment of the present invention, the moving distance of the structure is reduced in order to eliminate the irritability and the difficulty of setting the circuit in the conventional method of detecting the acceleration by the ceramic vibration sensor. By adopting the measuring method, the vibration of the structure is intuitively and rationally defined by the displacement amount, so that the circuit setting becomes easy.

Further, since the displacement is caused by the natural vibration characteristic of the structure itself, it is not necessary to consider the frequency characteristic in setting the circuit, so that the occurrence of an excessive response can be basically solved.

In the present invention, as shown in the embodiment, by using the Hall sensor 24a and the photodetector 24d for the displacement detector 24, the obtained output is physically proportional to the square of the distance. , Vibration (displacement) is better separated, and the accuracy of the detection standard is improved.

The present invention described in the above embodiments includes the following gist. (1) A disk recording / reproducing apparatus, comprising: a pickup mechanism for reading information from a disk or recording information on the disk; a chassis structure supporting the pickup mechanism; a driving mechanism for rotating the disk; A detection method for detecting a relative displacement between a structure serving as a vibration source and an apparatus housing in a disk recording / reproducing apparatus including a housing structure integrally supported.

(2) A disk recording / reproducing apparatus,
A pickup chassis structure integrating a feed mechanism for moving a pickup mechanism for reading and writing information from or to the disk in the radial direction of the disk, a drive mechanism for rotating the disk, and an apparatus housing structure for supporting the same; Detecting means for detecting a relative displacement between a pickup chassis structure serving as a vibration source and a housing structure supporting the pickup chassis structure.

(3) A disk recording / reproducing apparatus,
A pickup chassis structure in which a pickup mechanism for reading and writing information from or to a disk, a feed mechanism for moving the disk in the disk radial direction, and a drive mechanism for rotating the disk are integrated, and a housing structure for supporting the same. In a disk recording / reproducing device consisting of an object, the vibration of the pickup chassis structure is treated as a relative displacement with respect to the housing structure, and the distance is detected by a magnet and a Hall sensor configured to change the electrical output according to this displacement. Method.

(4) A disk recording / reproducing apparatus,
A pickup chassis structure in which a pickup mechanism for reading and writing information from or to a disk, a feed mechanism for moving the information in the disk radial direction, and a drive mechanism for rotating the disk are integrated, and a housing structure for supporting the same. In a disk recording / reproducing apparatus composed of an object, a vibration of a pickup chassis structure is treated as a relative displacement with respect to a housing structure, and a light source and a photoelectric conversion element (for example, , LED
And photo detector).

[0038]

Therefore, as described above, according to the present invention, there is provided a method and apparatus for detecting vibrations of an optical disk apparatus, which can easily avoid the conventional problems and improve the accuracy and usability. be able to.

[Brief description of the drawings]

FIG. 1 is a plan view showing a configuration of a main part of a CD-ROM device as an optical disk device according to a conventional method.

FIG. 2 is a block diagram showing a circuit configuration for processing an electric signal from a ceramic vibration sensor 14 used in FIG.

FIG. 3 shows a comparator 16 which converts an analog waveform SIG-A from a sensor amplifier 15 for amplifying an electric signal from a ceramic vibration sensor 14 used in FIG.
FIG. 13 is a waveform diagram showing that a determination process is performed as a pulsed waveform SIG-B by performing level discrimination with a certain threshold value.

FIG. 4 is a plan view showing a configuration of a main part of a CD-ROM device as an optical disk device to which the present invention is applied.

FIG. 5 is an enlarged view showing a configuration in which a minute magnet 24a and a hall sensor 24b are arranged to face each other as the displacement detector 24 used in FIG.

FIG. 6 is a block diagram showing a circuit configuration for processing an electric signal from a hall sensor 24b.

FIG. 7 shows a case where the vibration level is 1 and the output of the conventional system and the output of the present embodiment are each 1;
When the vibration level is 2, the output is merely doubled in the conventional method, whereas in the present embodiment, the minute magnet 24a and the Hall sensor 2 that constitute the displacement detector 24 are used.
FIG. 11 is a waveform diagram showing that it is possible to obtain an output four times in proportion to the square of the distance due to the physical properties of 4b.

FIG. 8 is an enlarged view showing a configuration in which an LED 24d and a photodetector 24e are arranged to face each other as a displacement detector 24.

FIG. 9 is a block diagram showing a circuit configuration for processing an electric signal from a photodetector 24e.

[Explanation of symbols]

 20a: Pickup mechanism, 20b: Pickup feed motor, 20c: Disk motor, 21: Pickup chassis structure, 23: Housing structure, 22: Pickup chassis support piece, L: Main vibration (displacement) direction, 24c: Sensor mounting 24, displacement detector, 24a, minute magnet, 24b, hall sensor, x, distance between hall sensor and minute magnet, 25, sensor amplifier, 27, CPU, 26, comparator, 24d, LED, 24e, photodetector 24e .

Claims (6)

[Claims] 1. A pickup chassis structure for supporting a pickup mechanism for recording / reproducing information on / from an optical disc, a drive mechanism for rotating the optical disc, and an integrated support of the pickup chassis structure and the drive mechanism Obtaining an electrical signal corresponding to a detected distance displacement amount by detecting a displacement of a relative distance between the pickup chassis structure serving as a vibration source and the housing structure in an optical disc device including a housing structure that performs vibration. And a step of detecting the occurrence of vibration by processing the obtained electric signal. 2. A pickup chassis structure for supporting a pickup mechanism for recording / reproducing information on / from an optical disc, a pickup feed mechanism for moving the pickup mechanism in a radial direction of the optical disc, and a drive for rotating the optical disc. In an optical disc device including a mechanism and a housing structure integrally supporting the pickup chassis structure, the pickup feed mechanism, and the drive mechanism, the optical pickup device includes a pickup chassis structure serving as a vibration source and the housing structure. Detecting a relative distance displacement to obtain an electrical signal corresponding to the detected distance displacement amount; and processing the obtained electrical signal to detect the occurrence of vibration. A method for detecting vibration of an optical disk device. 3. A pickup chassis structure for supporting a pickup mechanism for recording / reproducing information on / from an optical disc, a drive mechanism for rotating the optical disc, and an integrated support of the pickup chassis structure and the drive mechanism. An optical disc device comprising a housing structure that detects a displacement of a relative distance between the pickup chassis structure serving as a vibration source and the housing structure to obtain an electric signal corresponding to a detected distance displacement amount. A vibration detecting device for an optical disk device, comprising: a displacement detecting unit; and a vibration generation detecting unit that detects generation of vibration by processing an electric signal obtained by the distance displacement detecting unit. 4. A pickup chassis structure for supporting a pickup mechanism for recording / reproducing information on / from an optical disc, a pickup feed mechanism for moving the pickup mechanism in a radial direction of the optical disc, and a drive for rotating the optical disc. In an optical disc device including a mechanism and a housing structure integrally supporting the pickup chassis structure, the pickup feed mechanism, and the drive mechanism, the optical pickup device includes a pickup chassis structure serving as a vibration source and the housing structure. A distance displacement detecting means for detecting a relative distance displacement to obtain an electric signal corresponding to the detected distance displacement amount; and a vibration for processing the electric signal obtained by the distance displacement detecting means to detect the occurrence of vibration. A vibration detection device for an optical disk device, comprising: an occurrence detection unit. 5. The distance displacement detecting means comprises a magnet provided on one of the pickup chassis structure and the housing structure and a Hall sensor provided on the other. Or the vibration detection device for an optical disk device according to 4. 6. The distance displacement detecting means comprises a light source provided on one of the pickup chassis structure and the housing structure, and a photoelectric conversion element provided on the other. 5. The vibration detection device for an optical disk device according to 3 or 4.