JPH03250486A - Disk device - Google Patents

Abstract

PURPOSE:To reduce the size, weight and thickness of the disk device by distributing an interface connector and power supply connector on both the sides of a sidewall face opposed to a carriage and arranging a voice coil motor adjacently to the power supply connector. CONSTITUTION:A main control circuit substrate 5 is arranged on the upper part of a head 2, the carriage 3 and the voice coil motor 4 and the interface connector 6 and the power supply connector 7 are fixed to one end of the substrate 5 so as to be exposed from a base 1. Respective connectors 6, 7 are distributed to the right and left positions through the moving center of the carriage 3. Since the connector 6 is used for transmitting various signals with a host apparatus, many signal lines are required and longitudinal shape is required. Since the motor 4 is arranged adjacently to the connector 7, thrust based upon the size of the motor 4 exerts large influence upon a seeking speed, so that its size can not easily be reduced, but the space using efficiency can be improved while securing the necessary size as shown in the figure.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] This invention provides information processing by moving a magnetic head (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 disk device that performs recording/reproduction.

[Prior Art] A floppy disk device for driving a floppy disk, which is one of the magnetic recording media, 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 disk insertion/ejection mechanism that inserts and ejects a magnetic disk onto a base that serves as a chassis, a disk rotation drive mechanism that rotates the magnetic disk using a motor, and a head that rotates the magnetic disk along the radial direction of the magnetic disk. The main components are a head seek mechanism that moves the head to an arbitrary track position, and a head load mechanism that loads/unloads the head onto/from the disk.

Furthermore, the floppy disk device includes a main control circuit board having a control circuit for controlling the entire device, a motor control circuit board having a disk drive motor drive control circuit,
It also has a connector for interface with host equipment, a connector for power supply, etc.

Floppy disk drives configured in this way are constructed as terminal storage devices for host electronic devices such as personal computers and word processors, or are configured as independent general-purpose storage devices, or in most cases are used as host storage devices. Built into the main body of electronic equipment.

In recent years, floppy disk devices that can be installed have become smaller and more portable, and floppy disk devices have been made smaller and more portable.

There is a demand for thinner and lighter products.

In addition, the capacity of floppy disk devices is increasing, and with this, the head seek mechanism is also required to be faster, and a voice coil motor is used as its drive source.

[Problem to be solved by the invention] However, in the conventional disk device described above, it is necessary to provide an interface connector and a power supply connector on the main control circuit board for connection with the host device. In order to make the disk device smaller, thinner, and lighter, there are restrictions on the placement of the voice coil motor and each connector.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a disk device that can be made smaller, thinner, and lighter.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a head for writing/reading on a disc-shaped magnetic recording medium, a carriage for moving this head, and a carriage for moving this head. In a disk device equipped with a voice coil motor as a drive source for moving the magnetic recording medium in the radial direction, a power supply for supplying power to an interface connector for connecting to a host device, each circuit, and electronic components. The voice coil motor is disposed adjacent to the power supply connector, and the voice coil motor is disposed adjacent to the power supply connector.

[Function] According to the above means, the interface connector and the power supply connector are distributed on both sides of the same side wall surface, and the voice coil motor is arranged adjacent to the short width power supply connector, and the interface The power supply connector and the power supply connector are located on both sides with respect to the center line of movement of the carriage. Therefore, each connector and the voice coil motor can be efficiently arranged, making it possible to downsize the entire device.

[Embodiments] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of a disk device according to the present invention, and FIG. 2 is a plan view showing the inside thereof.

As shown in Figure 1, inside the base 1 is a head 2 (1 in Figure 1) that writes/reads data to/from a floppy disk.
Although only one head is shown in the figure, in reality, a second head for writing/reading is provided on the back side of the floppy disk, and a carriage 3 is installed to move this head 2. It is arranged. Further, in order to drive the carriage 3, a voice coil motor 4 is installed near the inner wall of the base 1.

Het 2. A main control circuit board 5 is disposed above the carriage 3 and voice coil motor 4.

An interface connector 6 and a power supply connector 7 are attached to one end of the main control circuit board 5 so as to be exposed from the base l. The interface connector 6 and the power supply connector 7 are installed on the left and right sides with respect to the center of movement of the carriage 3. Since the interface connector 6 needs to transmit various signals with the host device, the number of signal lines increases. Therefore, it has a horizontally long shape as shown in the figure.

The voice coil motor 4 has a large influence on the thrust force and seek speed depending on its size. For this reason, it is not possible to easily reduce the size of the device, but by arranging it as shown in FIG. 1, it is possible to increase the space utilization efficiency without securing the necessary size.

Next, the internal structure of the embodiment of the present invention will be explained with reference to FIG.

A floppy disk lO is loaded into a disk cassette (not shown) guided by a cassette holder 9 disposed within the base l.

A shutter opening/closing lever 11 is provided at the corner of the cassette holder 9 for opening and closing a shutter covering the opening of the floppy disk IO and for loading/ejecting the disk cassette.

A head load assembly 12 is disposed adjacent to a voice coil motor (VCM) 4 to bring the head 2 into contact with or away from the floppy disk IO.

The head load assembly 12 uses a solenoid, and when the head load assembly 12 is energized, the head 2 comes into contact with the recording surface of the floppy disk IO, and when the energization is turned off, the head 2 separates from the disk surface.

The voice coil motor 4, which serves as a drive source for head seek, is composed of a yoke 13 and a mover 16 having a magnet 14 and a coil 15 disposed within the yoke 13. The carriage 3 is integrally attached to the mover 16.

Here, the head seek operation will be explained.

When the current is applied to the coil 15, the magnetic field generated by the coil 15 and the magnetic interaction with the magnet 14 cause the mover 16 to
or move. The carriage 3 moves together with the mover 16. A head arm 17 is attached to the carriage 3 via a spring. Further, a plurality of bearings 18 are attached to the carriage 3, and while being guided by guide bars 19 and 20, the carriage 3 seeks so as to move forward or backward in the radial direction of the floppy disk 10, and moves the head 2 to a predetermined track position. Move to.

The carriage 3 is provided with a head 2, and the head arm F is provided with a second head 21, which allows information to be written/read on both sides of the floppy disk 10.

Furthermore, the linear scale 2 is parallel to the guide bar 19.20.
2 are fixedly arranged. This linear scale 22 has slits (not shown) formed at equal intervals. on the other hand,
A sensor 23 attached to the carriage 3 constitutes a linear scale 22 or an encoder 24. sensor 23
The amount of movement of the carriage 3, that is, the amount of movement of each head, can be detected by receiving the light emitted from the light emitting element by the light receiving element through the slit and counting the number of slits that have passed through.

A speed detector 25 is disposed below the shutter opening/closing lever 11. The speed detector 25 is.

Mover 26. A coil 27 wound around this mover 26,
iron yoke 28. and a magnet 29 provided on this iron yoke 28.

This speed detector 25 can detect speed by extracting the current generated in the coil 27 when the coil 27 passes through the magnetic field of the magnet 29 as the moving element 26 moves.

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

A comparator 30, 31 is connected to each of the two output terminals of the encoder 24, and a track counter 32 is connected to each output terminal. A microcomputer (hereinafter referred to as microcomputer) 33 is connected to the track counter 32, which executes various controls according to programs. Further, a differential amplifier 34 is further connected to the encoder 24.

An amplifier 35 for amplifying the output signals is connected to the heads 2 and 21, and a phase error detection circuit 36 is connected to this amplifier 35.The output signal of the zero phase error detection circuit 36 is sent to the microcomputer 33 is applied to

Further, an amplifier 37 is connected to the speed detector 25, one output terminal of this amplifier 37 is connected to a phase compensation circuit 38 that outputs a phase-compensated speed signal d, and the other output terminal (speed signal A differential circuit 39 is connected to the differential circuit 39 (which outputs f). A comparator 40 is connected to the partial circuit 39, and its output signal (data destruction signal e) is sent to the microcomputer 33.
is applied to

An adder circuit 41 is connected to the output terminal of the microcomputer 33, and to this adder circuit 41, in addition to the microcomputer output, a rough position signal (s) and a speed signal (d) output from the differential amplifier 34 are applied. The adder circuit 41 includes a voice coil motor 4
A power amplifier 42 for driving is connected.

Further, an interface connector 6 for connection with a host machine is connected to the microcomputer 33.

Further, each circuit shown in FIG. 3 is connected to a power supply connector 7, which is supplied with power from an external power supply device (not shown), according to voltage.

All the circuits other than those shown in the dotted line frame shown in FIG. 3 are mounted on the main control circuit board 5.

Next, the operation of the circuit shown in FIG. 3 will be explained.

The destinations to which the heads 2 and 21 should be moved are determined through an input means (not shown) such as a keyboard (or the memory of a microprocessor, etc.), and a movement command is sent to the output terminal of the microcomputer 33. This command is applied to the power amplifier 42 via the adder circuit 41, and the voice coil motor 4 is driven by the power amplifier 42.

When the voice coil motor 4 is driven, the mover 16 shown in FIG. 2 moves, and the carriage 3 integrally fixed thereto moves along guide bars 19,20. When the carriage 3 moves, information about the movement, for example 906, two signals φA whose phases are shifted.

It is output from the encoder 24 as φB.

The output signal of the encoder 24 is applied to a differential amplifier 34, and a rough position signal summation circuit 41 is applied to roughly position the head position based on the intersection point of the two signal waveforms (i.e., the point where the phase difference is 0). to be applied. Furthermore, the two output signals φA and φB of the encoder 24 are applied to comparators 30 and 31, and are compared with respective set values.
The comparison value is sent to the track counter 32. This track counter 32 counts in the forward or reverse direction, and the count result is sent to the microcomputer 3 as a current position signal C indicating where the head is currently located.
is applied to

Further, the information regarding the moving speed of the carriage 3 detected by the speed detector 25 is amplified by an amplifier 37 and then applied to a phase compensation circuit 38, and from this phase compensation circuit 38, a phase compensated signal d is sent to an adder circuit. 41. This signal d is used to prevent oscillation caused by phase shift. On the other hand, the signal f separately output from the amplifier 37 is sent to the microcomputer 3 as information for speed control.
3 is applied. Further, the signal f is input to the partial circuit 39, and its differentiated output is compared with a reference value by a comparator 40.

When the signal f causes a speed fluctuation that exceeds the reference value of the voice coil motor 4, the comparator 40 applies the signal e to the microcomputer 33, and performs control such as prohibiting writing, to prevent data destruction due to impact. To prevent.

Furthermore, the heads 2 and 21 read the floppy disk lO
The servo information of the track recorded above is detected,
After being amplified by an amplifier 35, it is applied to a phase error detection circuit 36. The phase error detection circuit 36 sends a track-following position error signal g to the microcomputer 33.

Carriage 3 and head 2
, 21 are precisely controlled. For example, when the count value of the target position in the microcomputer 33 matches the count value obtained by the track counter 32 as the sensor 23 moves, the signal a becomes "0" and the output of the differential amplifier 34 becomes "0". 0'' (that is, at a track position corresponding to a predetermined slit position), the head stops.

[Effects of the Invention] As is clear from the above, the present invention includes a disc-shaped magnetic recording medium for writing/reading data, a carriage for moving the head, and a carriage for moving the head on the disk-shaped magnetic recording medium. In a disk device equipped with a voice coil motor as a drive source for moving the disk in the radial direction,
An interface connector for connecting to a host device and a power supply connector for supplying power to each circuit and electronic components are distributed at both ends of the side wall surface facing the carriage, and adjacent to the power supply connector. Since the voice coil motor is arranged in the same manner as above, each connector and the voice coil motor can be efficiently arranged, space can be used effectively, and the entire device can be downsized.

It is possible to achieve a reduction in weight and thickness.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of a disk device according to the present invention, FIG. 2 is a plan view showing the inside thereof, and FIG. 3 is a block diagram showing details of a head position control circuit. In the figure, 2.21: head 3, carriage 4, voice coil motor 5: main control circuit board 6: interface connector 7: power supply connector 10: floppy disk 12: head rotor assembly 15.27: coil 16.26+ Mover 17: Head arm 22: Linear scale 23: Sensor 24: Encoder 25: Speed detector 29: Magnet 33: Microcomputer

Claims (1)

[Claims] The disc-shaped magnetic recording medium is equipped with a head for writing/reading information, a carriage for moving the head, and a voice coil motor as a driving source for moving the carriage in the radial direction of the magnetic recording medium. In the disk device, an interface connector for connecting to a host device and a power supply connector for supplying power to each circuit and electronic components are distributed at both ends of the side wall surface facing the carriage, and the power supply A disk device characterized in that the voice coil motor is disposed adjacent to a connector for use with the voice coil motor.