JPH05182441A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE:To enable the discharge of a disk without lowering a magnetic head onto the disk in a dew condensation state by providing a dew condensation sensor on the required surface of a hub receiving tray to be mounted with the disk. CONSTITUTION:The disk is mounted on the hub receiving tray 5 of a substrate 1 having an information recording and reproducing medium layer 2, a center hub 3, etc., and is turned by means of a spindle motor 4. The dew condensation sensor 6 is embedded into the surface of the receiving tray part 5 and the dew condensation of the substrate 1 and the substrate 1 side surface of the insertion part of the hub 3 is detected. The disk is discharged without lowering the micromagnetic head onto the disk in the dew condensation state if the discharge, etc., of the disk is controlled in accordance with the result of the detection. The trouble of a suspension for the magnetic head and the spindle motor is accordingly prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording / reproducing apparatus, and more particularly to an apparatus for recording by modulating a magnetic field or light and using a flying slider having the magnetic head or an integrated optical head. is there. This is particularly effective when a disk cartridge is inserted or the same cartridge with dew condensation is accidentally inserted in an environment where a thermal shock such as dew condensation may occur on the disk surface.

[0002]

2. Description of the Related Art In recent years, memory devices capable of recording / reproducing / erasing information have been under development, and an optical disk featuring a large capacity and a high density is a typical example. The magneto-optical disk is a representative of a large capacity and high density recording device. In addition, since the optical disk is characterized by its exchangeability, a fixed disk, which has a conventional hermetic structure, has a replaceable disk cartridge.

In the magneto-optical disk, the main development is to realize a high transfer rate and a high speed access in order to compete with a fixed disk. Therefore, at the present time, when rewriting recorded information, the erasing process of old information is performed. The so-called overwrite technology, in which new information is recorded over old information without passing through it, is being actively developed. As one of the methods, there is a magnetic field modulation recording method in which a magnetic head is used to reverse the direction of an external magnetic field according to the information to be recorded while irradiating a laser beam of a constant intensity to perform recording and erasing on a magneto-optical disk. is there. In this method, a magnetic head provided on a slider is urged to one main surface side of the magneto-optical disk by a suspension composed of a leaf spring, etc. A levitation type magnetic head is used that levitates at a fixed minute interval.

A method of integrating conventional optical heads on a small slider has also been devised for high speed access. This is a flying type head in which a laser, a photodetector and the like are integrated on a slider like the above magnetic head. As a result, the weight of the optical head is reduced, and access at higher speed than that of the conventional optical head can be realized, which is one of the most actively developed technologies at present.
The optical head can also be used for a phase change type optical disk that modulates laser intensity.

In the above two methods, the slider and the disk are not in contact when the slider is levitated, but are in contact at the beginning and the end of disk rotation (during loading and ejecting) (CSS (C
ontact start and stop). ). This causes damage to the disc due to friction, which shortens the life of the disc. However, a method of performing these in a non-contact manner, that is, at the time of starting and stopping the rotation of the disk, the floating head is held in a non-contact position with the disk, and after the disk is rotated, the floating head is lowered onto the surface of the disk for recording. -A method of erasing is also being considered.

[0006]

However, as in the case of performing CSS, of course, in the above-mentioned non-contact, when the floating type head is raised and lowered to the disk surface and dew condensation is generated on the disk surface, the possibility of adsorption is extremely high. Get higher If the adsorption occurs, the suspension may be damaged, the spindle motor for rotating the disk may be damaged, or the information recording surface of the disk may be damaged, which causes the information recording / reproducing apparatus to be fatally damaged.

Further, it is known that the above-mentioned adsorption is mainly caused by water. Due to its portability, a disk cartridge may be brought into a room with high temperature and humidity from the outside with a low temperature, so that a so-called thermal shock may be applied to cause condensation on the disk cartridge and the disk surface. .. If the condensed disk is inserted into the information recording / reproducing apparatus, the slider and the disk are attracted to each other, and the information recording / reproducing apparatus is destroyed.

An object of the present invention is to eject a disk without ejecting a minute magnetic head onto the disk in a dew condensation state, and to rotate the suspension or the disk that provides the magnetic head in the apparatus accordingly. To prevent the scramble motor from breaking down.

[0009]

In order to achieve the above object, the information recording / reproducing apparatus of the present invention has a hub tray on which a disc disk is placed, which is embedded in the hub tray on the surface in contact with the disc disk. It is characterized in that it is provided with a dew condensation sensor for detecting dew condensation on the substrate side surface of the disc disk substrate and the center hub insertion portion.

[0010]

When the current information needs to be rewritten or the current information needs to be reproduced, the disc disk is inserted into the apparatus. Then, before lowering the magnetic head to the inserted disk disc, there is condensation on the substrate side surface of the disk disc substrate and the center hub insertion part by the dew condensation sensor embedded in the hub tray on the surface contacting the disc disc. Check if there is no. If condensation is detected by the condensation sensor, the disc disk is automatically ejected out of the device. Alternatively, the magnetic head is lowered onto the disk disk after the condensation has dried inside the device.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The overall construction of an embodiment of the information recording / reproducing apparatus of the present invention will be described with reference to the schematic sectional view of FIG. The disc disk is formed by forming a desired information recording / reproducing medium layer 2 on the main surface of the substrate 1 and inserting a center hub 3 in the central hole of the substrate 1.

In this information recording / reproducing apparatus, when the disc disk is inserted into the apparatus 11, a dew condensation sensor 6 for detecting dew condensation on the substrate side surface of the disc disk substrate 1 and the insertion portion of the center hub 3 is attached to the spindle motor 4. It is formed by being embedded in the main surface of the upper hub pan 5. When dew condensation is not detected by the dew condensation sensor 6, a drive mechanism including a floating magnetic head 8 and a semiconductor laser 9 and a diaphragm lens 10 that narrows down the laser light emitted from the semiconductor laser 9 approaches the disk disk and operates. When the dew condensation sensor 6 detects dew condensation, the inserted disc disk is automatically ejected. Alternatively, the magnetic head is lowered onto the disk disk after the condensation has dried in the device.

Next, the discharging operation and the starting operation of the information recording / reproducing apparatus of the embodiment of the present invention will be described with reference to FIGS. 2 (a) to 2 (d). When it is necessary to rewrite the current information or reproduce the current information, a disc disk for forming a desired information recording / reproducing medium layer 2 on the main surface of the substrate 1 is inserted into the device 11 (FIG. 2A). So-called thermal shock is applied to the surface of the inserted disk disk substrate 1 and the surface of the insertion portion of the center hub 3 on the substrate side from outside with low temperature and humidity to cause so-called dew condensation. There are cases.

The presence or absence of dew condensation is checked by a dew condensation sensor 6 embedded in the main surface of the hub tray 5 above the spindle motor 4 (FIG. 2 (b)). When the dew condensation sensor 6 detects dew condensation, the disk disc is automatically ejected without lowering the magnetic head 8 onto the disk disc.

If dew condensation is not detected, the inserted disc disk is placed on the tray 5 (FIG. 2 (c)), the spindle motor 4 is driven, and the disc disk starts to rotate. As the dew condensation sensor 6, it is possible to use the one normally used in a video deck or the like. When the disk disk starts to rotate, the suspension type magnetic disk 8 squeezes the laser beam emitted from the floating magnetic head 8 and the semiconductor laser 9 and the semiconductor laser 9 biased to one main surface side of the disk disk by the suspension 7 composed of a leaf spring or the like. The drive mechanism including the diaphragm lens 10 approaches the disk disk, and the floating magnetic head 8 is lowered onto the information recording / reproducing medium layer of the disk disk to rewrite the current information or reproduce the current information.

By the above ejecting operation, the disc disk is ejected, and it is possible to prevent damage to the information recording surface of the disc disk due to attraction with the magnetic head 8. As for the dew condensation sensor 6 and its output signal, as shown in FIG. 3A, a terminal for output is taken out beside the hub tray 5, and an FG (Freque) normally outputted from the spindle motor 4 is outputted.
Since the spindle motor 4 can be stopped at a specific position by an ncy generator signal, a signal detection terminal may be provided at the stop position.

With the terminal 12 having a protrusion as shown in FIG. 3 (b), the pin 13 can be surely placed in the output signal section, so that the dew condensation signal from the dew condensation sensor 6 can be taken out.

Further, as another embodiment, a spindle motor 4 is used which outputs a normal FG signal (FIG. 4 (a)) to another signal (FIG. 4 (b)) for each revolution of the disk by a condensation signal. It is also possible. Although the method of using the FG signal of the spindle motor 4 is taken up here, it is not necessary to be particular about this method. For example, the spindle motor 4 has a notch, and mechanically,
There is a method of detecting by electrical contact or optically non-contact.

[0019]

As described above, the information recording / reproducing apparatus of the present invention automatically ejects the disk disc without dropping the magnetic head on the disk disc when the dew condensation is detected on the surface of the inserted disc disk. The failure of the suspension that supports the magnetic head inside and the spindle motor that rotates the disk can be prevented.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing the overall configuration of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a discharging operation and a starting operation according to an embodiment of the present invention.

FIG. 3 is an explanatory diagram of output terminals of the dew condensation sensor of FIG.

FIG. 4 is an explanatory diagram of an FG signal output from a spindle motor according to another embodiment of the present invention.

[Explanation of symbols]

 1 substrate 2 information recording / reproducing medium layer 3 center hub 4 spindle motor 5 hub pan 6 condensation sensor

Claims (1)

[Claims] 1. A hub tray on which a disc disk is mounted is provided, which is embedded in the hub tray on the surface in contact with the disc disk, and detects dew condensation on the board-side surface of the board of the disk disk and the insertion portion of the center hub. An information recording / reproducing apparatus having a dew condensation sensor.