JPS62112263A - Eccentricity correcting device - Google Patents

Abstract

PURPOSE:To attain magnetic recording and reproducing small in track dislocation with a correcting mechanism by rewriting the contents of a detecting device each time a recording medium is inserted, and always outputting the optimum correcting signal from the detecting device. CONSTITUTION:Magnetic recording media 1 is positioned at a spindle 6 provided at a motor 2 by a clamp 5 and rotated. A head 4 is for the recording and reproducing, a track 17 is read which is synchronized and eccentric to an index signal 13, further, an aeolotropic component 19 is added and the signal of a synthetic waveform 20 is obtained. A detecting device 10, based upon the signal of the synthetic waveform 20, sends the correcting information synchronized to the index signal 13 to a correcting control circuit 11. Then, the correcting control circuit 11 sends the signal of the correcting and driving to a correcting mechanism 14, smoothens the piezoelectric element shown at a feeding base 26 and a stator yoke 28 of a motor 2 is displaced in the direction separated from the base 26. Thus, the rotation central shaft of a spindle 21 of the motor is changed and even to the eccentric and recorded media, the stable output can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an eccentricity correction device used for correcting eccentricity and anisotropy of floppy disk drives and the like.

2. Description of the Related Art In a conventional floppy disk drive, since the magnetic recording medium is replaceable, each time the medium is replaced, the center of the medium and the drive motor are misaligned, causing the concentric tracks to become eccentric and distorting the head. There is a problem with the playback output changing. The same thing happens with the anisotropy of the medium.

Problems to be Solved by the Invention The purpose of the present invention is to correct the eccentricity and anisotropy caused by this insertion/removal to obtain a stable reproduction output, thereby improving the recording and reproduction characteristics of the magnetic recording medium. The object of the present invention is to provide an excellent magnetic recording device.

Means for Solving the Problems In order to achieve the above object, the present invention provides a head provided between a drive motor that positions and rotates a recording medium and a base that holds this drive motor. A correction mechanism is provided to change the center line of the rotating shaft of the drive motor in response to the signals from the eccentricity and anisotropy detector, and further to respond in synchronization with the index signal from the inch and squirrel detector. In addition, the correction is made each time the recording medium is replaced by rewriting the contents of the detector using the ready signal.

Effects The present invention has the following effects due to the above configuration. That is, each time the recording medium is inserted, the contents of the detector are rewritten, and the optimal correction signal is always output from the detector, so that the correction mechanism enables magnetic recording and reproduction with less track deviation. Become.

Embodiment FIG. 1 shows the configuration of an embodiment of the present invention. In FIG. 1, ``■'' is a magnetic recording medium, which is positioned by a clamp 5 on a spindle 6 provided on a motor 2 and rotated. The head 4 is for recording and reproducing, and reads out an eccentric track 17 as shown in FIG. 2 in synchronization with the index signal 13, and further adds an anisotropic component 19 to form a composite waveform 20 as shown in FIG. It is used to obtain signals.

Based on the signal of the composite waveform 20, the detector 10 transmits correction information synchronized with the Intex signal 13 to the correction control circuit 1.
Send to 1. The correction control circuit 11 sends a correction drive signal to the correction mechanism 14 to mix the piezoelectric elements shown on the base 26 in FIG. As a result, the stator yoke 28 of the motor 2 is displaced in a direction away from the base 26. This changes the central axis of rotation of the spindle 21 of the motor.

Furthermore, by rewriting the eccentricity and anisotropy information using the ready signal 14, there is an effect that recording and reproduction can always be performed in an optimal state. The piezoelectric element 26 in the above embodiment may be a combination of a heater and a bimetal, or a combination of a small coil and a magnet.

Effects of the Invention As is clear from the above embodiments, the present invention rewrites the eccentricity information using the ready signal and corrects the eccentricity by synchronizing with the intex signal. It also has the advantage of providing stable output.

[Brief explanation of drawings]

Fig. 1 is a block diagram of an embodiment of the present invention, Fig. 2 is an explanatory diagram of eccentricity of a recording medium, 31. Magnetic recording medium, 2... motor, 3... motor control circuit, 4...
Head, 5... Clamp, 6... Spindle, 7.
... Index detector, 8... Drive control circuit, 9... Recording/reproducing circuit, 10... Detector, 1
1... Correction control circuit, 12. Ready signal, 13... Intex signal, 14... Correction mechanism, 15... Magnetic recording medium, 15' To index horn 16... Regular track, 17... Eccentric trunk, 18...
Eccentric component, 19... Anisotropic component, 20... Composite waveform, 2
DESCRIPTION OF SYMBOLS 1...Spindle, 22-Bearing, 23-Magnet, 24-Guide, 25 Piezoelectric element, 26-Base, 27-Bearing housing, 28-Stator yoke, 29-Loaf yoke. Name of agent: Patent attorney Toshio Nakao (1st person)
Figure 2 Figure 4 Figure 2i 2:5

Claims (1)

[Claims] A floppy disk device that magnetically records and reproduces information on a magnetic recording medium, a magnetic head housed in the device that reads out eccentric tracks in synchronization with an index signal recorded on the magnetic recording medium, and a signal of this magnetic head. and an anisotropic component, and send out correction information synchronized with the index signal.The detector is housed in the device body, and when the correction information is input, the stator yoke of the motor is displaced in the direction away from the base. What is claimed is: 1. An eccentricity correction device comprising: a piezoelectric element; the piezoelectric element is displaced to change a central axis of rotation of a spindle of a motor;