JPH03250472A - Disk device - Google Patents

Abstract

PURPOSE:To make a part of a main body the fixing part and opening structure and to provide the moving element with high rigidity by arranging a voice coil motor on the opposite side of a shutter opening/closing lever against the center line of a magnetic head in its moving direction. CONSTITUTION:The voice coil motor 1 is arranged on the opposite side of the shutter opening/closing lever 25 against the moving center of the magnetic head 7. Thereby, the fixing part of the moving element 4 of a carriage 6 can be formed unitedly with the fixing part 43 of the head 7. Thereby, extremely high rigidity can be applied to the peripheral part of the moving element 4 for driving the carriage 6 by the constitution. Consequently, the resonance frequency of the carriage 6 is improved and the performance of a positioning control system can be improved. Although a metallic material such as aluminium die-cast is usually used for the carriage 6, an inexpensive and light plastic material can also be used in this constitution.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention moves a magnetic spatula I~ (hereinafter simply referred to as a head) to a desired one of tracks sequentially formed concentrically on a magnetic recording medium. The present invention relates to a disc device that records/reproduces information using a disc drive.

[Prior Art] A floppy disk device for driving a floppy disk, which is a type of magnetic recording medium, rotates a removably loaded floppy disk using a direct drive motor, and makes sliding contact without moving the head. recording/reproduction.

This type of disk drive consists of a base that serves as a chassis, a disk insertion/ejection mechanism that inserts and ejects magnetic disks, a disk rotation drive mechanism that rotates the magnetic disk using a motor, and a head that rotates along the radial direction of the magnetic disk. The head seek mechanism moves the head to a desired track position, and the head load mechanism loads/unloads the head onto/from the disk.

FIG. 3 is a perspective view showing a head drive mechanism of a conventional disk device.

A voice coil motor (VCM) 1 serving as a drive source has a yoke 2 with one side open. A magnet 3 placed inside this yoke 2. A mover 4 movably disposed within the yoke 2. and a coil 5 provided on the mover 4.

An L-shaped carriage 6 is integrally attached to the mover 4, and a magnetic head 7.8 for writing/reading information on/from the floppy disk 10 is attached to the carriage 6. The carriage 6 seeks in the radial direction of the floppy disk 10 by the torque generated by the interaction between the magnetic field generated when the coil 5 is energized and the magnetic field of the magnet 3, and moves the magnetic head 7.8 to a predetermined track position. can be done.

A head arm 9 for bringing the magnetic head 8 into contact with/separating from the floppy disk 10 is attached to the carriage 6 so as to be pressed by a spring 9a. A magnetic head 8 is attached to the lower end of the head arm 9.

A pair of guide bars 11 and 12 are arranged in parallel on both sides of the voice coil motor 1, and a plurality of bearings 13 slidably connected to each of the guide bars 11 and 12 are provided on the carriage 6. As a result, the carriage 6 moves the guide bar 11.1
2 allows for smooth movement.

A linear scale 14 is fixedly installed on the base side parallel to the guide bar 1.1. This linear scale 1
4, a large number of slits 15 are provided at equal intervals. A sensor 16 is attached to the carriage 6, and the sensor 16 and the linear scale 14 form an encoder 17. The light emitted from the light emitting element of the sensor 16 is
The amount of movement of the carriage 6, that is, the amount of movement of each head, can be detected by receiving light through the slit 15 by the light receiving element and counting the number of lights that have passed through the slit.

A speed detector 18 is arranged near the linear scale I4. This speed detector 18 is connected to the moving element 19. A coil 20, an iron yoke 21, wound around this mover 19. and a magnet 22 provided on this iron yoke 21.

This speed detector 18 extracts the current generated in the coil 20 when the coil 20 passes through the magnetic field of the magnet 22 by moving the movable element 19, and this current change is used as a speed detection signal.

Next, load the disk cassette (consisting of a floppy disk, a heart case that rotatably stores it, a shutter that allows the head to move in and out of the disk surface, etc.).
The ejection mechanism will be explained with reference to FIG.

Disk cassette 2 containing 10 floppy disks
3, a shutter 24 is provided at a portion facing the write/read area of the disk.

A shutter opening/closing lever 25 is provided to open the shutter 24 in conjunction with the insertion of the disk cassette 23.

The shutter opening/closing lever 25 has a number "7" shape, and the tip of the claw protruding from its corner comes into contact with one end of the shutter 24 when the disk cassette 23 is inserted, and as the disk cassette 23 is inserted, the shutter 24 is opened. Move in the direction perpendicular to the insertion direction. This movement exposes the write/read area of the floppy disk 10, allowing contact with the magnetic head 7.8.

Next, the head position control circuit of the disk device will be explained with reference to FIG.

to each of the two output terminals of encoder 17.

Comparators 27 and 2B are connected, and a track counter 29 is connected to each output terminal. A microcomputer (hereinafter referred to as microcomputer) 30 is connected to the track counter 29, which executes various controls according to programs. Further, a differential amplifier 31 is further connected to the encoder 17.

An amplifier 32 for amplifying the output signals thereof is connected to the magnetic heads 7 and 8, and a phase error detection circuit 33 is connected to the amplifier 32. The output signal of the phase error detection circuit 33 is applied to the microcomputer 30.

Further, an amplifier 34 is connected to the speed detector 18, and one output terminal of the amplifier 34 is connected to a phase compensation circuit 35 that outputs a phase-compensated speed signal d, and the other output terminal (speed signal A differentiation circuit 36 is connected to the output terminal f. A comparator 37 is connected to the differentiating circuit 36, and its output signal (data destruction signal e) is sent to the microcomputer 30.
is applied to

An adder circuit 38 is connected to the output terminal of the microcomputer 30, and in addition to the output signal a of the microcomputer, the adder circuit 38 receives
A rough position signal d and a speed signal d output from the differential amplifier 31 are applied. A power amplifier 39 for driving the voice coil motor l is connected to the adder circuit 38.

Next, the operation of the circuit shown in Figure 1/JS5 will be explained.

Each destination of the head 7.8 is determined through input means such as a keyboard (not shown) (or the memory of a microprocessor, etc.), and a movement command is sent to the output terminal of the microcomputer 30. This command is applied to the power amplifier 39 via the adder circuit 38, and the voice coil motor 1 is driven by the power amplifier 39.

When the voice coil motor 1 is driven, the mover 4 shown in FIG. 3 moves, and the carriage 6 incorporated therein moves along guide bars 11 and 12.

When the carriage 6 moves, information about the movement is generated.For example, 90 @ two signals φ whose phases are shifted.
A and φB are output from the encoder 17.

The output signal of the encoder 17 is applied to the differential amplifier 31, and the intersection point of the two signal waveforms (i.e., the point of zero phase difference)
In order to perform rough positioning of the head position based on
The coarse value and the signal S are applied to the adder circuit 38. Further, the two output signals φA and φB of the encoder 17 are applied to comparators 27 and 2B, and are compared with respective set values, and the comparison values are sent to the track counter 29. This track counter 29 performs counting in the forward or reverse direction, and the count result is applied to the microcomputer 30 as a current position signal C indicating where the head is currently located on the track.

Further, information regarding the moving speed of the carriage 3 detected by the speed detector 18 is amplified by an amplifier 34 and then applied to a phase compensation circuit 35, and from this phase compensation circuit 35, a phase compensated signal d is sent to an adder circuit 38. will be sent to. This signal d is used to prevent oscillation caused by phase deviation. On the other hand, the signal f separately output from the amplifier 34 is sent to the microcomputer 3 as information for speed control.
Applied to 0. Further, the signal f is input to a differentiating circuit 36, and the differential output thereof is compared with a reference value by a comparator 37.

If the signal f causes a speed fluctuation that exceeds the reference value of the voice coil motor l, the comparator 37 applies a signal e to the microcomputer 30, and performs control such as prohibiting writing, to prevent data destruction due to impact. To prevent.

Furthermore, the floppy disk 10 is loaded by the heads 7 and 8.
The servo information of the track recorded on the second track is detected,
After being amplified by an amplifier 32, it is applied to a phase error detection circuit 33. The phase error detection circuit 33 detects the track following position ri.
The error signal g is sent to the microcomputer 30.

Based on each signal described in , the carriage 6 and the head 7
．． 8 precise position control is performed. For example, microcontroller 3
When the count value of the target position within 0 matches the count value of the track counter 29 (11) as the sensor 16 moves, the signal a becomes "0" and the differential amplifier 3
When the output of 1 is "0" (that is, at a track position t corresponding to a predetermined slit position), the head stops.

[Problems to be Solved by the Invention] However, in the conventional double-disk stirrup, as shown in FIG. Therefore, the mounting portion 26 of the mover 4 has a structure that protrudes from the main body of the carriage 6, resulting in a problem that the mechanical strength of the mounting portion 26 is reduced. That is, force is applied to the mover 4 in the direction of the arrow,
If the mechanical strength of the mounting portion 26 is low, resonance at low frequencies will occur, which is an obstacle to realizing a high-performance control system.

In a head positioning control system using a voice coil motor, the mechanical characteristics of the carriage are particularly important, and these characteristics influence the access speed and positioning accuracy of the device.

An object of the present invention has been made in view of the above-mentioned actual state of the prior art, and is to provide a disk device in which the mechanical strength of the carriage mechanism can be increased and the performance of the control system can be improved.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a magnetic head for writing/reading on/from a disc-shaped magnetic recording medium;
It includes a carriage for moving the magnetic head, a voice coil motor as a driving source for moving the carriage in the radial direction of the magnetic recording medium, and a shutter opening/closing lever for opening and closing the shutter of the cassette containing the magnetic recording medium. In the disk drive, the voice coil motor is arranged on the opposite side of the shutter opening/closing lever with respect to the center line of movement of the magnetic head.

Further, in order to increase the resonant frequency of the carriage, it is preferable that the carriage is formed integrally with a mounting portion of the mover of the voice coil motor and a portion near the mounting portion of the magnetic field.

[Function] -1- According to the means described above, the voice coil motor is disposed on the opposite side of the shutter opening/closing lever with respect to the center line in the moving direction of the magnetic head, so that the mounting part of the slider is separated from the main body of the carriage. It does not have a bulging structure, but instead uses a part of the main body as a mounting part. Therefore, the movable element that drives the carriage can be maintained in high tonality.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing one embodiment of a disk device according to the present invention, and FIG. 2 is a plan view showing a state in which the head arm 9 is removed from FIG.

In this embodiment, the same reference numerals are used for the same parts as shown in FIGS. 3 and 5, and redundant explanation will be omitted below.

As shown in FIG. 1, a head 7.8 for writing/reading data to/from a floppy disk is disposed within the base 1, and a carriage 6 is disposed for moving the head 8. In addition, in order to drive the carry engine 6,
The voice coil motor 1 is arranged near the inner wall of the base 40.

A floppy disk 10 is loaded inside a disk cassette 23 guided by a cassette holder 41 disposed within the base 1.

A shutter opening/closing lever 25 is provided at a corner of the cassette holder 41 for opening/closing a shutter covering the opening of the floppy disk IO and for loading/ejecting the disk cassette.

The installation position n of this shutter opening/closing lever 25 is the same as the conventional one.

A head load assembly 42 is disposed adjacent to the voice coil motor 1 to bring the head 8 into contact with or away from the floppy disk IO. The head load assembly 42 uses a tray, and when energized, the head 8 comes into contact with the recording surface of the floppy disk 10, and when the energization is turned off, the head 8 separates from the disk surface.

As shown in FIG. 2, a voice coil motor 1 is disposed on the opposite side of the shutter opening/closing lever 25 with respect to the center of movement of the head. Therefore, it becomes possible to integrally form the space between the mounting portion 26 of the movable member 4 of the carriage 6 and the receiving portion 43 of the magnetic head.

With such a structure, the movable element 4 that drives the carriage 6 can have extremely high tonality in its peripheral area. As a result, the resonant frequency of the carriage 6 increases, making it possible to improve the performance of the positioning control system.

Further, the carriage 6 has conventionally been made of a metal material such as aluminum die-casting, and thus has been expensive. but,
According to the present invention, as a result of considering the overall arrangement and the shape of the carriage 6 as described above, it is possible to use a lightweight and inexpensive plastic material.

[Effects of the Invention] Since the present invention is configured as described above, it achieves the following effects.

In the disk device according to claim (1), there is provided a magnetic head for writing/reading data to/from a disk-shaped magnetic recording medium, a carriage for moving the magnetic head, and a radius of the magnetic recording medium for moving the carriage. In a disk drive comprising a voice coil motor as a drive source for moving the magnetic head in a direction, and a shutter opening/closing lever for opening and closing a shutter of a cassette containing the magnetic recording medium, the voice coil motor is aligned with the center line of movement of the magnetic head. On the other hand, by arranging the shutter on the opposite side of the shutter opening/closing lever, the mover for driving the carriage that moves the magnetic head can be supported at high temperature, which enables high-performance disk mounting. can be obtained.

In the disk device according to claim (2), the carriage includes a mounting portion for a mover of the voice coil motor;
Since the magnetic head and the vicinity of the mounting portion are integrally formed, the resonant frequency of the carriage can be increased, and control performance can be improved.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of a disk device according to the present invention, FIG. 2 is a plan view showing a state in which the head arm is removed from FIG. 1, and FIG. 3 is a plan view showing a head drive of a conventional disk device. FIG. 4 is a perspective view showing the mechanism, FIG. 4 is a plan view showing the disk cassette loading/unloading mechanism, and FIG. 5 is a block diagram showing details of the position control circuit. In the figure: ■Voice coil motor 2: Yoke 4: Mover 6, Carriage 7.8: Head 9, Head arm 0, Floppy disk 11.12 Nigaite bar 24 Shutter 25: Shutter opening/closing lever 26.43: Mounting part 41 :Cassette holder

Claims (2)

[Claims] (1) A magnetic head for writing to/reading from a disk-shaped magnetic recording medium, a carriage for moving this magnetic head, and a voice coil as a driving source for moving this carriage in the radial direction of the magnetic recording medium. In a disk drive comprising a motor and a shutter opening/closing lever for opening and closing a shutter of a cassette containing the magnetic recording medium, the voice coil motor is arranged on the opposite side of the shutter opening/closing lever with respect to a center line of movement of the magnetic head. A disk device characterized by: (2) The disk according to claim 1, wherein in the carriage, a mounting portion of the mover of the voice coil motor and a vicinity of the mounting portion of the magnetic head are integrally formed. Device.