JP2544647B2 - Storage device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of use) A magnetic storage device and a storage device for recording / reading information by a recording / reproducing head slidingly contacting a storage medium have been widely put into practical use. . The biggest problem with this type of storage device is wear. If the contact is unstable, the head may “jump” and recording / reproduction may not be performed. The present invention relates to a storage device that reduces wear and prevents head "jumping".

(Problems to be Solved by Prior Art and Invention) There is a floppy device as a contact-sliding type magnetic memory device. This is an apparatus for recording / reproducing in a contact state where a magnetic head is pressed against a flexible magnetic disk disk coated with magnetic powder. The pressing load is ten and several grams, and the life due to wear comes after millions to tens of millions of passes. When a metal thin film storage medium, which is expected as a high-density storage medium in the future, is used, the wear is more severe and there is a problem in practical use.

Further, in a magnetic disk device in which a magnetic head floats without contact, the head comes into contact and slides at the time of starting and stopping, and wears. In a magnetic disk using a metal thin film storage medium, a hard protective film such as carbon is deposited on a few hundred angstroms to reduce wear, but the start / stop life is still only tens of thousands of times. In order to further improve the recording density in the future, the thickness of the protective film must be made thinner, and therefore the life will be shortened.

VHD is a video disk that reads information by changing the capacitance. In this method, a capacitance detection type head on the disk surface slides in contact. This is also problematic in terms of service life, as compared with an optical recording type video disc that does not contact at all.

The conventional storage device exemplified above has a long life due to severe wear due to high load and local severe wear when contacting minute projections scattered on the storage medium. If the pressing load is reduced to reduce the wear, the head will bounce over the storage medium, and normal recording / reproduction cannot be performed.

The present invention has been proposed to improve the above-mentioned drawbacks, and an object thereof is to apply a head having an extremely light load and no jump to a storage device to realize a storage device having a long life and a high storage density. In order to achieve this, a mechanism for detecting the frictional force between the head and the storage medium and controlling the load is used.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides a head provided on one end of a leaf spring for contact sliding on a storage medium, and the leaf spring at the other end. Parallel spring provided perpendicularly to the length direction of the parallel spring, a displacement detection mechanism that is provided to face the parallel spring and detects the displacement of the parallel spring, and the parallel spring is sucked so that the deflection of the parallel spring is always zero. A deflection adjusting electromagnet, a load adjusting electromagnet that is provided in the vicinity of the leaf spring and adjusts a load on the storage medium of the head, a friction displacement control circuit that receives a signal from the displacement detection mechanism, and the friction displacement. And a friction force control circuit for actuating the load adjusting electromagnet in response to a signal from a control circuit, wherein a contact friction force of the head during contact sliding of the head is applied to the parallel spring and a displacement detection mechanism for displacement of the parallel spring. Therefore, the present invention provides a storage device characterized in that the load adjustment electromagnet is operated by the friction displacement control circuit and the friction force control circuit to detect the detection signal so that the friction force falls within a certain range.

(Operation) In the present invention, in the storage device in which the recording / reproducing head contacts and slides on the storage medium to record and read information,
By providing a mechanism that detects the frictional force when the head is in contact and slides and adjusts the pressing force of the head on the storage medium according to the detected frictional force to control the frictional force within a certain range. Since the head can be stably brought into contact with and slid on the surface of the storage medium with a minute load and frictional force, a storage device having a long life can be realized. In addition, stable contact can almost eliminate the effective gap between the head and the storage medium, which enables recording and reading at high density.

(Example) Next, the Example of this invention is described.

It is needless to say that the embodiment is merely an example, and various modifications and improvements can be made without departing from the spirit of the present invention.

 FIG. 1 shows a side view of an embodiment of the present invention and a control circuit.

In the figure, 1 is a head, 2 is a leaf spring, and the head 1 is fixed to the tip of this leaf spring 2. 3 is a storage medium,
The head 1 slides in contact therewith. Reference numeral 4 is a load adjusting electromagnet that attracts the leaf spring 2 and adjusts the load. 5 is a parallel spring. The parallel spring 2 bends due to the frictional force generated by the sliding contact of the head 1 with the storage medium 3. 6 is a parallel spring 5
Is a displacement detection mechanism that detects the displacement of the device, and is composed of a capacitance sensor, an optical sensor, a tunnel current sensor that detects a tunnel current, and the like. Reference numeral 7 denotes a deflection adjusting electromagnet that attracts the parallel spring 5 and makes the deflection of the parallel spring 5 always zero. 8
Is a frictional displacement control circuit that controls the current of the deflection adjusting electromagnet 7 to which the displacement signal from the displacement detection mechanism 6 is input to make the deflection of the parallel spring zero. The attraction force of the deflection adjusting electromagnet 7 generated by the operation of the friction displacement control circuit 8 is
Is equal to the frictional force between the storage medium 3 and the storage medium 3. Reference numeral 9 is an output of the friction displacement control circuit 8, that is, an attraction force of the deflection adjusting electromagnet 7, and when the friction force is a problem, the current of the load adjusting electromagnet 4 is reduced, and when the friction force is too small, the current is increased to keep a constant value. This is a frictional force control circuit that controls so that a frictional force is generated. 10 is a read signal from the head 1 and the head 1
It is a signal processing circuit for processing a write signal to.

In order to operate this, first, the head 1 is moved in contact with the storage medium 3. At this time, the pressing force of the head 1 to the storage medium 3 is extremely small and is set to, for example, milligram or less. When the storage medium 3 is run, frictional force is generated in the head 1,
The deflection of the parallel spring 5 is adjusted by the friction displacement control circuit 8 and the deflection adjusting electromagnet 7 so that the deflection is always zero. This reduces the jitter of the writing / reading information. The frictional force changes depending on the properties of the storage medium. In particular, if the surface has a large step difference or the adsorbed substance is collected, the frictional force becomes extremely large. Further, the head jump easily occurs. Such a phenomenon causes rapid wear in the part,
The generated abrasion powder is adsorbed on the head and the storage medium to further promote abrasion. The control of the load adjusting electromagnet 4 is for avoiding this, and acts to decrease the pressing force of the head 1 when the frictional force increases. However, since the frictional force is generated only in the contact state, the head 1 is not completely separated from the storage medium 3. In this way the head 1
Is brought into contact with and slides on the storage medium 3 with a certain amount of friction by frictional force, and the head 1 performs stable writing and reading of information.

FIG. 2 is a diagram showing another embodiment of the present invention. In the figure, 1 is a head, 3 is a storage medium, 4 is a load adjusting electromagnet, 6 is a displacement detecting mechanism, 7 is a deflection adjusting electromagnet, 8 is a friction displacement control circuit, 9 is a friction force control circuit, 10 is a signal processing circuit, Reference numeral 11 indicates an L-shaped spring. In this embodiment, the leaf spring 2 and the parallel spring 5 of the embodiment shown in FIG.
To realize a simple structure.

Even if a bar spring is used instead of the leaf spring of the embodiment of the present invention, the effect of the present invention is not lost, and instead of the electromagnet, a mechanism that generates another attractive force or repulsive force such as electrostatic force is used. However, the effect of the present invention is not lost.

The device of the present invention can be realized as a storage device of various recording and reading principles.

If a storage medium that stores data in the form of magnetization is used, it becomes a device that records with a magnetic head that generates the next time and reads with a magnetic sensor of an inductive type or a magnetoresistive effect type.

If a storage medium that stores the shape of electric charges is used, the device can perform recording and reading with simple electrodes.

If information is recorded on the storage medium by the irregularities of the conductor surface or the change of the dielectric constant of the surface, the device can be read by a simple electrode as the change of the capacitance. Furthermore, by applying a voltage higher than that at the time of reading to the electrodes and making unevenness or crystal structure change in the storage medium, it becomes a device capable of recording.

If a storage medium is used as a conductor and information is recorded by the unevenness of the conductor surface or changes in electrical resistance, the device can be read out as changes in contact resistance or tunnel current using electrodes. Furthermore, by applying a voltage higher than that at the time of reading to the electrodes and making unevenness or crystal structure change in the storage medium, it becomes a device capable of recording.

If information is recorded as a change in reflectance of the storage medium, the device can be read by an optical sensor such as a thin optical fiber. Further, by irradiating the storage medium with intense light from the tip of the optical sensor to cause a change in the reflectance of the storage medium, the device becomes capable of recording.

When the information is recorded in the storage medium as unevenness and the unevenness is detected as displacement using a stylus, the device becomes a device for reading the surface roughness as information. Furthermore, a voltage can be applied to the stylus to form irregularities on the storage medium, which enables recording.

 The embodiments of the present invention are summarized as follows.

(A) When the storage medium stores information in the form of magnetization, the head is a magnetic sensor. (B) When the storage medium stores information in the form of electric charge, the head is an electrode. (C) When the storage medium stores information in the form of capacitance with the head, the head is an electrode. (D) Storage medium stores information in the form of contact resistance or tunnel current resistance. If the head is an electrode (e) If the storage medium stores information in the form of light reflectance, then the head is an optical sensor (f) The storage medium is uneven For information storage, the head is a stylus, etc.

(Effect of the Invention) As described above, according to the present invention, a head that is provided at one end of a leaf spring and slides in contact with a storage medium, and the other end of the leaf spring is perpendicular to the length direction of the leaf spring. A parallel spring provided to the parallel spring, a displacement detection mechanism provided to face the parallel spring and detecting the displacement of the parallel spring, and a deflection adjusting electromagnet that attracts the parallel spring and makes the deflection of the parallel spring always zero. A load adjusting electromagnet that is provided close to the leaf spring and that adjusts the load of the head on the storage medium,
A friction displacement control circuit that receives a signal from the displacement detection mechanism and a friction force control circuit that receives a signal from the friction displacement control circuit and operates the load adjusting electromagnet are provided. Detecting the contact friction force of the parallel spring and the displacement detection mechanism of the displacement of the parallel spring,
The detection signal is controlled by the friction displacement control circuit and the friction force control circuit to activate the load adjusting electromagnet to keep the friction force within a certain range, so that the head stably contacts and slides on the surface of the storage medium with extremely small load and friction force. Therefore, a long-life storage device can be realized. Further, the stable contact has an effect that the effective gap between the head and the storage medium can be almost reduced, and thus recording and reading can be performed at high density.

[Brief description of drawings]

FIG. 1 shows a side view of an embodiment of a memory device of the present invention and a control circuit, and FIG. 2 shows another embodiment of the present invention. 1 ... Head, 2 ... Leaf spring, 3 ... Storage medium, 4 ...
Load adjusting electromagnet, 5 ... Parallel spring, 6 ... Displacement detecting mechanism, 7 ... Deflection adjusting electromagnet, 8 ... Friction displacement control circuit, 9 ... Friction force control circuit, 10 ... Signal processing circuit, 11 ...
... L-shaped spring

Claims (3)

(57) [Claims] 1. A head, which is provided at one end of a leaf spring and which slides in contact with a storage medium, and a parallel spring, which is provided at the other end of the leaf spring and is perpendicular to the length direction of the leaf spring, A displacement detection mechanism that is provided so as to face the parallel spring and that detects the displacement of the parallel spring, a deflection adjustment electromagnet that attracts the parallel spring and makes the deflection of the parallel spring always zero, and is provided close to the leaf spring. A load adjusting electromagnet that adjusts the load of the head with respect to the storage medium, a frictional displacement control circuit that receives a signal from the displacement detection mechanism, and a signal from the frictional displacement control circuit to operate the load adjusting electromagnet. A frictional force control circuit, the contacting frictional force of the head during contact sliding of the head is detected by the parallel spring and the displacement detecting mechanism of the displacement of the parallel spring, and the detection signal is detected by the frictional displacement control circuit and the frictional force. Storage device, characterized in that to accommodate the frictional force actuated the load adjusting magnet within a predetermined range by the control circuit. 2. The storage device according to claim 1, wherein an electrostatic attraction plate is used instead of the electromagnet. 3. The storage device according to claim 1, wherein a bar spring is used instead of the leaf spring.