JPH02265087A - Vibration control device for disk reading device - Google Patents

Abstract

PURPOSE:To reduce the vibration and to improve the follow-up performance and the read capacity of a servo-system by providing a sensor for detecting the vibration and a damping device provided with a control circuit. CONSTITUTION:Vibration at four parts in the vicinity of a floating mechanism of a traverse base 2 being in a floating state by floating rubber 7 and a floating spring 8 is detected with an acceleration sensor 18. Based on the amplitude of the detected amplitude, speed, acceleration, and a frequency signal, the frequency of an opposite phase, speed and an amplitude signal are generated by a control circuit 20. Its signal is applied to the damping devices 11a - 17a attached in the vicinity of sensors 18a, 18b, and the vibration of an opposite phase is generated. In such a manner, the vibration of a disk reader is reduced and the read capacity to an eccentric wobbling surface is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for projecting a light spot onto a disc-shaped recording medium.
The present invention relates to a disc performance device, an optical pickup, and a vibration damping device for reducing vibrations of the disc in a disc performance device that optically records and reproduces information.

2. Description of the Related Art In recent years, disc reading devices such as CD players and CD-
The applications of ROMs, multi-laser players, etc. are diversifying year by year, and are becoming more and more high-performance, high-quality, and high-value-added.In order to play discs accurately, disc reading devices, optical pink-up, and disc vibration reduction are required. Even stricter requirements are being imposed. In addition, we also provide disc reading devices for compact disc playback and CD-ROMs.
To 3.

As for disk reading devices, the demand for balk pull and vehicle-mounted devices is on the rise, and there is a need for further improvements in vibration resistance.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of a vibration isolation mechanism of a conventional dual disc reading device will be described below with reference to the drawings.

FIG. 5 shows a vibration isolation mechanism of a conventional Dainuk reader. In FIG. 5, 1 is the support pace, lj:
) Rubber space, 3 is a spindle motor, 4 is a turntable, 5 is a centering ring, 6 is a clamper, 7 is a floating rubber, 8 is a floating spring, 9 is a floating screw, and 1Q is a disk.

The operation of the vibration isolation mechanism of the disc reading device configured as above will be explained below.

If, a turn tape /I/4 is accurately attached to the spindle motor 3 attached to the traverse space 2 at a specified height. A centering ring 5 is attached to the turn tape/I/3, and a disk 10 is attached by a clamper 6 to read the disk. A traverse space 2 is attached to the support base 1 by a floating rubber 7, a floating spring 8, and a floating screw 9, and the two traverse spaces are in a floating state. This vibration isolation mechanism attenuates or blocks external vibrations such as vibrations from the floor, vibrations and resonance of the exterior case and support base, and reduces vibrations of the disc reader, optical pick amplifier, and disc. The close-up focus and tracking performance of the tracking servo system have been greatly improved.

Problems to be Solved by the Invention However, in the configuration as described in item 1, vibrations of the disc reading device due to the eccentric force of the disc that occurs when reading the disc, vibrations of the disc reading device due to uneven rotation and cogging of the spindle motor, and vibrations of the disc reading device due to the uneven rotation of the spindle motor and cogging, and the support base - External case - Disc reading device caused by disturbances from the floor, sound pressure from speakers, etc. - Disc reading device due to vibration of the disc - Optical pick amplifier - Disk is always in a state of vibration, causing surface runout and eccentric acceleration of the disc , Deinuk resonance,
The vibration of the optical pick amplifier and the vibration of the focus lens always have a negative effect on the tracking performance of the focus and tracking servo system, resulting in a problem that the disc reading ability is reduced. It was.

In view of the above-mentioned problems, the present invention has been developed in view of the vibrations transmitted from the support base/exterior case to the disc reading device, sound pressure, uneven rotation of the spindle motor, cogging, resonance caused by various components in the disc reading device, etc. generated from the disc reading device itself. The present invention provides a vibration control device that reduces disc vibration caused by vibration, sound pressure, and disc eccentricity, greatly improves the tracking performance of the optical pickup focus and tracking servo system, and enables accurate disc reading. .

Means for Solving the Problems In order to solve the above problems, the present invention includes a disc reading device, a supporting base for the disc reading device, and a floating state for the disc reading device on the supporting base. attached to said disc reader with a floating mechanism for keeping;
a sensor that detects vibrations of the Deinuku reading device;
The apparatus includes a damping device that applies a damping force to the disk reading device, and a control circuit that generates a damping signal based on a signal from the sensor and drives the damping device.

Operation The present invention has the above-described configuration, and is capable of suppressing periodic vibrations on the traverse space due to eccentric acceleration of the Deinuk, periodic vibrations on the traverse space due to uneven rotation and cogging of the spindle motor, and periodic vibrations on the traverse space due to uneven rotation and cogging of the spindle motor, which occur when reading a disc. Aperiodic vibrations on the traverse space due to disturbances,
A sensor detects periodic and non-periodic vibrations on the traverse space transmitted by resonance from the support base/exterior case, and a control circuit drives a vibration damping device to control the traverse space, optical pick amplifier, focus lens, and disk. This greatly reduces the vibration of the optical pickup, greatly improves the focusing performance of the optical pickup and the tracking performance of the tracking servo system, and greatly improves the ability to read eccentric and wobbling data.

Embodiments Hereinafter, a vibration control device for a disk reading device according to embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a schematic cross-sectional view of a floating mechanism section, a vibration damping device section, and a spindle mechanism section of a vibration control device for a disk reading device showing a first embodiment of the present invention.
FIG. 2 is an exploded perspective view of a vibration control device for a disc reading device showing a first embodiment of the present invention. In Figures 1 and 2, 1 is a support base, 2 is l.
Rubber space, 3 is a spindle motor, 4 is a turntable, 5 is a centering ring assembly, 6 is a clamper, 7 floating rubbers, 8 floating springs, 9 is a floating screw, 1o is a disk, which is attached to the traverse space 2 A turn tape /L/4 is accurately attached to the spindle motor 3 at a specified height. A centering ring assembly 5 is attached to the turntable 3 by press fitting, and a disk 10 is attached by a clamper 6. Traver spaces 2 are attached to four locations on the support base 1 by a floating mechanism consisting of a floating rubber 7, a floating spring 8, and a floating screw 9.
Point floating state -11.12,13
, 14, 15, 16.17 are vibration damping devices for applying an allocation force to the traverse space 2.
11 is a coil, 12 is a coil bobbin for winding the coil 11, 13 is a coil bobbin mounting screw for attaching the coil bobbin to the traverse space 2, and 14 is a yoke. A115 is a permanent magnet for constantly generating a magnetic field in the vibration damping device of yoke B116, and 1γ is a permanent magnet for yoke A1 after inserting the coil bobbin 12 into yoke A14.
4 and yoke B15 to 9...-7 support base 1 using screws,
18 is an acceleration sensor for detecting vibrations in the traverse space 2, and is installed at four locations near the floating mechanism and the vibration damping device.19
2o is an optical pink-up, and 2o is a vibration damping circuit that generates a control signal according to a prescribed control law based on the vibration signal from the acceleration sensor 18 and drives the vibration damping device. 21 is an imported optical pickup guide, 24 is an optical pickup guide shaft B, and 25 is a holding plate B for fixing the guide shaft B.
, 26 are screws for attaching the presser plate B to the 1-rubber space 2. 27 is a linear motor assembly for driving the optical pickup 19 in the tracking direction; 22 is a holding plate A for attaching the guide import 21 and the linear motor assembly 27 to the traverse space 2; and 23
The presser plate A22 is attached to the travertine vane 72 using screws. 28 is a guide roller for optical pink-up, and 29 is a guide roller retaining ring.

30 is a focus lens, 31 is a focus lens 10
・\-/ The lens holder 32 is a 4-wire suspension for holding the lens 30, and the lens holder 31 fl is attached to the optical pink-up 19 by the 4-wire suspension 32. There is. Reference numeral 33 indicates a screw for attaching the control circuit to the control circuit 20f:l/rubber space 2.

The operation of the vibration control device for a disc reading device configured as described above will be described below.

FIG. 3 is a model diagram showing the vibration damping operation of each part of the vibration control device of the Dainuk reader. First, vibrations at four locations (near the floating mechanism of the traverse space 2) are detected by the acceleration sensor 18, and based on the amplitude, velocity, acceleration, and frequency signals of the vibrations detected by the acceleration sensor 18, the control circuit 20 A frequency, velocity, and amplitude signal with a phase opposite to that of the detected vibration signal is applied to each coil 11 installed near each acceleration sensor that detected vibration, and each acceleration sensor 18 detects the vibration at four locations 11... A vibration having a completely opposite phase to the vibration on the traverse space is generated in each of the vibration damping devices in the vicinity of where the vibration is detected by each acceleration sensor 18.

For example, by generating damping signals '111a to 17a with the same vibration amplitude and opposite phase as the vibration signal detected by 18a, vibrations on the Dainuk reader are reduced. The same applies to 18b and other two points not shown in the operational model diagram.

As described above, according to this embodiment, four of the traverse vests 2
An acceleration sensor 18 is attached to the traverse space 2 to detect the frequency, amplitude, and velocity acceleration state of the vibration of the traverse space 2. By adding it to each vibration damping device near each detection point, the vibration of the traverse space 2 is greatly reduced, and the focusing performance of the optical pink-up 19 and the focus lens 30 and the tracking performance of the tracking servo system are greatly improved. The ability to read disks can be greatly improved.

A second embodiment of the present invention will be described below with reference to the drawings.

The configuration of the second embodiment is similar to that in FIGS. 1 and 2. FIG. 4 is a model diagram showing the vibration damping operation of the vibration control device of the disc reading device. In FIG. 4, only two of the four locations of the vibration damping device and the acceleration sensor 18 are shown for simplicity.

The operation of the vibration control device for the Dainuk reader configured as described above will be described below.

FIG. 4 shows the operation of the vibration control device of the disk reading device. First, vibrations at four locations near the floating mechanism of the traverse space 2 are detected by the acceleration sensor 18. Based on the detected vibration signal, a vibration damping signal having the same amplitude and phase as the detection point having the maximum vibration amplitude is generated in another vibration damping device located diagonally to the detection point.

As described above, according to this embodiment, the traverse base 13
Acceleration sensors 18 are installed at four locations on the traverse space 2 to detect the frequency, amplitude, speed, and acceleration of vibrations in the traverse space 2. When the vibrations at all four locations are not in the same phase, the detection point where the maximum amplitude occurs is detected. and the vibration damping device located on the second diagonal,
By generating a damping force with the same amplitude and phase as the maximum amplitude point, it is possible to reduce the influence of the physical force of the disk reading device. In addition, when the vibration damping force is generated, the focus lens 3Q can reduce the vibration of the disk reading device without being swung in the opposite direction to the vibration damping force due to the inertia of the focus lens's own weight. It is possible to greatly improve the following performance and further improve the ability to read eccentricity and surface runout.

In addition, in FIG. 2, the acceleration sensor 18 and the vibration damping devices 11 to 1 are shown at four locations, but they may be located at one location.

Advantages of the Invention As described in "2", the present invention provides flow 14 at a supporting pace "2".
l\-A disc reading device in a noting state, a sensor that detects vibrations of the disc reading device, a vibration damping device that generates a damping force on the disc reading device, and a vibration damping device that generates a damping force based on the signal from the sensor. By providing a control circuit for generating a vibration signal and driving the vibration damping device, the vibration of the disk reading device can be greatly reduced, the focusing performance of the optical pink-up and the tracking performance of the tracking servo system can be greatly improved, and the deviation can be improved. It is possible to greatly improve the reading ability for core and surface runout discs.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view of a floating mechanism section, a vibration damping mechanism section, and a spindle mechanism section of a vibration control device of a disk reading device in Embodiment 1 of the present invention, and FIG. 2 is a schematic cross-sectional view of the disk reading device in Embodiment 1 of the present invention. FIG. 3 is an operational model diagram of the vibration control device for a disk reading device according to the first embodiment of the present invention, and FIG. 4 is an exploded perspective view of the vibration control device for the disk reading device according to the second embodiment of the present invention. Figure 5 shows the operating model diagram of the conventional Dinu 15.
・＼-7 It is a schematic diagram of the cross-sectional cylinder of the vibration isolation mechanism of the reading device. 1...Support base, 2...1-Rubber space, 3...Spindle motor, 7...Floating rubber, 8...Floating spring, 9
...Floating screw, 11 ...Coil, 12 ...Coil bobbin, 14.15...
Yoke, 16... Permanent magnet, 18... Acceleration sensor, 19... Optical pickup, 20...
...Control circuit. Name of agent: Patent attorney Shigetaka Awano and one other person: Ai Garo & Otsu Kano

Claims (2)

[Claims] (1) a disc reading device, a support base for the disc reading device, a floating mechanism for keeping the disc reading device floating on the support base, and a floating mechanism attached to the disc reading device and supporting the disc reading device; A sensor for detecting vibration, a vibration damping device that applies a damping force to the disk reading device, and a control circuit that generates a vibration damping signal based on a signal from the sensor and drives the vibration damping device. A vibration control device for a disk reading device, comprising: (2) In the disk reading device having a floating mechanism at three or more points, the vibration signal detected by the sensor installed near the floating mechanism at one or more points and a vibration damping force in the opposite phase are transmitted by the control circuit. 2. The vibration control device for a disk reading device according to claim 1, wherein the vibration control device generates the vibration in the vibration damping device installed near one or more of the floating mechanisms.