JPH04335277A - Recording or reproducing device - Google Patents

Abstract

PURPOSE:To provide a recording or reproducing device capable of preventing a carriage from being damaged without providing a special driving means. CONSTITUTION:In the reproducing device which is furnished with heads 8, 9 for recording or reproducing the information to a recording medium 10, a carriage 1 provided freely movable to the recording medium 10 while mounting these heads 8, 9, and a motor 13 driving this carriage 1, the constitution is made so that an elastic part 60 is formed at both ends of the moving area of carriage 1 on the shaft parallel with the moving shaft of carriage passing through the approximate centroidal position of the movable part including the aforementioned carriage 1 on the moving plane of carriage 1.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is applicable to, for example, moving a recording/reproducing head to a desired track position on a track formed on a disc-shaped recording medium to record or reproduce information on the recording medium. The present invention relates to a recording or reproducing device.

0002

2. Description of the Related Art This type of recording/reproducing device is a floppy disk drive device (hereinafter referred to as a floppy disk) that records and reproduces information on a flexible magnetic disk, a so-called floppy disk (hereinafter referred to as a disk), used as an external storage device for a computer. (hereinafter referred to as FDD).

[0003] In recent years, FDDs have been rapidly becoming smaller and larger in capacity, and accordingly there has been a demand for faster head access times. In recent years, in order to meet this demand, voice coil motors (hereinafter referred to as VCM), which are advantageous for higher speeds, have been developed.
has been adopted in head access mechanisms.

The magnetic head access mechanism will be explained with reference to FIG. It has a VCM 13 as a driving source, and a magnet 19 and a coil 20 attached to the carriage 1 are provided in a yoke 18 of the VCM 13. When a current flows through the coil 20, the carriage 1 is moved by interaction with the magnetic field of the magnet 19. moreover,
A head arm 3 and a spring hanging plate 50 are attached to the carriage 1 with screws 52. The spring hanging plate 50 is provided with a pressing spring 51 for pressing the magnetic heads 8 and 9, which will be described later, against the disk 10.

[0005] The carriage 1 also has a plurality of rollers 2.
1 is attached at an arbitrary angle, and a preload 22 consisting of a roller 22a and a load spring 22b for pressing the roller 22a against the first guide bar 23 and the second guide bar 24 causes the carriage 1 to be is elastically supported via rollers 21 between guide bars 23 and 24. Guided by guide bars 23 and 24, the carriage 1 can seek in a direction toward and away from the center of the disk 10, and can be moved to a predetermined track position.

The carriage 1 and the head arm 3 are provided with magnetic heads 8 and 9, respectively, and as is well known, information is recorded and reproduced on both sides of the disk by the magnetic heads 8 and 9.

Furthermore, a linear scale 15 is provided parallel to the guide bars 23 and 24. This linear scale 15 has slits 15a formed at equal intervals, and the light emitted from the light emitting element of the sensor 25 attached to the carriage 1 is received by the light receiving element through the slit 15a. By calculating the numbers,
The amount of movement of the carriage 1, that is, the amount of movement of the heads 8 and 9 can be detected. Note that an encoder 26 is configured by the linear scale 15 and the sensor 25.

[0008]

[Problems to be Solved by the Invention] By the way, in the head access mechanism having the structure as described above,
When the VCM 13 is not energized, the movable parts such as the carriage 1 are in a freely movable state. In other words, in an FDD using such a head access mechanism, if an external impact is applied to the FDD during transportation or carrying, the movable parts such as the carriage 1 will collide with their limits of movement, and the carriage 1 or its components may be damaged. There is a risk of damage. Furthermore, if the movable part of the carriage 1 or the like collides with the movement limit at a position other than the center of gravity, unnecessary moment will be generated and damage will be amplified.

For this reason, in such FDDs, a method is adopted in which the carriage is immovably locked by a driving means such as a solenoid, but in this case, the provision of the driving means increases the cost and also reduces the consumption of the driving means. There has been a problem in that the power consumption of the entire FDD increases because of the electric power.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a recording and reproducing apparatus that can prevent damage to the carriage without providing any special driving means.

[0011]

[Means for Solving the Problems] In order to solve the conventional problems and achieve the above object, the present invention provides a head for recording or reproducing information on a recording medium, a head equipped with this head, and a method for recording information on the recording medium. In a recording or reproducing apparatus comprising a carriage configured to be movable relative to the carriage, and a motor for driving the carriage, the motor passes through the approximate center of gravity of the movable part including the carriage on the plane of movement of the carriage, and Elastic parts are formed at both ends of the movement range of the carriage on an axis parallel to the movement axis of the carriage.

0012

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

1 to 3 are views showing an embodiment of a recording/reproducing apparatus according to the present invention, in which FIG. 1 is a plan view, FIG. 2 is a perspective view of the main part, and FIG. 3 is an enlarged view of the main part.

In FIGS. 1 and 2, a cassette holder 12 provided in a chassis 11 guides a disk 10, which is a recording medium, housed in a disk cassette (not shown) to a predetermined position. A shutter opening/closing lever 16 is provided at a corner of the cassette holder 12 for opening and closing a shutter covering an opening of a disc cassette (not shown) and for loading/ejecting the disc cassette. On the other hand, a head load assembly 17 is disposed adjacent to a voice coil motor (hereinafter referred to as VCM) 13 in order to bring the magnetic heads 8 and 9 into contact with or away from the disk 10. A solenoid is used in this head load assembly 17, and when the solenoid is energized, the magnetic heads 8, 9
are in contact with the recording surface of the disk 10, and the magnetic heads 8, 9 are separated from the surface of the disk 10 when not energized.

[0015] Next, the access mechanism of the magnetic head will be explained, but the explanation of parts similar to those in the prior art will be omitted.

The center of gravity of the movable parts including the carriage 1 in the plane of movement of the carriage 1 is on the axis G shown by the broken line in FIGS. 1 and 3. Also, this axis G is the carriage 1
It is also parallel to the axis of movement of The structure is such that a portion of the movable portion formed on this axis G comes into contact with a shock absorbing member (elastic portion).

In FIG. 3, the carriage 1 is provided with a protrusion 1a on an axis passing through the center of gravity of the movable part, and a rubber damper 60 as a shock absorbing member is provided at both ends of the movement range of the protrusion 1a of the carriage 1. The movable parts such as the carriage 1 are configured such that the protrusion 1a contacts only the rubber damper 60.

According to the present embodiment as described above, even if a shock is applied to the FDD during transportation or carrying, the protrusion 1a of the carriage 1 is prevented from hitting the rubber damper 60 as a shock absorbing member at both ends of the movement stroke. Because of the collision, unnecessary moment is not exerted and these damages can be prevented.

[Other Embodiments] FIG. 4 shows a second embodiment, in which the shock absorbing member is effective by a spring 62 guided by a cylindrical guide 61. Furthermore, FIG. 5 shows a third embodiment, which is composed of a movable damper 63 inserted into a cylindrical guide 61 with a slight gap, and is affected by the action of air between the two. It absorbs shock.

Next, the control of the recording/reproducing apparatus of the present invention will be explained using the block diagram shown in FIG. In the same figure, magnetic heads 8 and 9 are inputted via an input means such as a keyboard (not shown) or a memory of a microprocessor.
The destination of the movement is determined, a movement command a is sent, and the VCM 13 is driven via the adder circuit 101 and the power amplifier 102. When the VCM 13 is driven, the carriage 1 is moved along the guide bars 23 and 24 due to the interaction between the current flowing through the coil 20 and the magnet 19, as described above. When the carriage 1 is moved, information regarding the movement of the carriage 1 is transmitted to the sensor 25, which is provided integrally with the carriage 1, and the linear scale 15, which is fixed to the chassis 11. encoder 2 as two signals φA and φB.
It is output from 6. The output signal of the encoder 26 is first input to the downstream differential amplifier 103, and rough head positioning is performed using the intersection of both signal waveforms, that is, the point of zero phase difference, as a reference, and the output of the differential amplifier 103 is rough. The signal is input as the position signal b to the adder circuit 101 at the subsequent stage.

Furthermore, the output signal of the encoder 26 is
After being input to comparators 104 and 105 at the subsequent stage and compared with predetermined values, the output thereof is input to a track counter 106 at the subsequent stage and counting is performed in the forward or reverse direction. The output c is then input to the microcomputer 100 as a current position signal indicating where the head is currently located on the track.

Further, information regarding the moving speed of the carriage detected by the electronic tachometer 150 is transmitted to the phase compensation circuit 10.
8 and the phase-compensated signal d is input to the adder circuit 101.
This prevents oscillations caused by phase errors. In addition, the signal f is sent to the microcomputer 10 for speed control.
It is input to 0.

Furthermore, the signal related to the moving speed of the carriage detected by the electronic tachometer 150 is sent to the differentiating circuit 10.
9 and is compared with a predetermined value in a subsequent comparator 110. When a speed fluctuation exceeding the reference value of the comparator 110 occurs, the output signal e from the comparator is applied to the microcomputer 100 to prevent data destruction due to impact, for example, by inhibiting writing.

Furthermore, the servo information of the track recorded on the disk 10 is detected by the magnetic heads 8, 9 themselves, amplified by the amplifier 111 at the subsequent stage, and inputted to the position error detection circuit 112 to determine the track following position. The error signal g is input to the microcomputer 100.

In this way, the coarse position signal b and the phase-compensated speed signal d are directly input to the adder circuit 101, the current position signal c and the speed signal f are input to the microcomputer 100, and the Carriage 1 according to the shock prevention signal e and the track following servo signal g.
Accurate position control of the magnetic heads 8 and 9 that are moved together with the magnetic heads 8 and 9 is performed, for example, the count value of the target position in the microcomputer 100 and the count value obtained by the track counter 106 as the sensor 25 moves. When they match, the signal a becomes "0" and the differential amplifier 103 becomes "0".
'', that is, the head stops at a track position corresponding to a predetermined slit position.

Head position control can be performed in the manner described above. In this case, according to the embodiment of the present invention described above, the center of gravity of the movable part such as the carriage collides with the shock absorbing member at both ends of the movement range of the carriage, so that the carriage of the head access mechanism and its components , which can be prevented from being damaged.

The above configuration is not limited to FDDs, but can be similarly applied to other recording and reproducing apparatuses that record or reproduce information by moving a carriage on which a recording or reproducing head is mounted.

[0028]

As is clear from the above description, according to the present invention, when a disturbance or the like occurs, the center of gravity of the movable part of the carriage, etc. Since the head access mechanism is brought into contact with the head access mechanism, the carriage of the head access mechanism and its components can be prevented from being damaged, and it can be implemented very easily and inexpensively, and an excellent effect can be obtained without increasing power consumption.

[Brief explanation of drawings]

FIG. 1 is a plan view showing a first embodiment of the present invention.

FIG. 2 is a perspective view of essential parts showing a first embodiment of the present invention.

FIG. 3 is an enlarged view of main parts showing a first embodiment of the present invention.

FIG. 4 is an enlarged view of main parts showing a second embodiment of the present invention.

FIG. 5 is an enlarged view of main parts showing a third embodiment of the present invention.

FIG. 6 is a block diagram showing a head position control circuit in an embodiment of the present invention.

FIG. 7 is a perspective view of essential parts of a conventional device.

[Explanation of symbols]

1 Carriage 1a Carriage protrusion 13 Voice coil motor 18 York 20 Coil 60 Rubber damper

Claims (3)

[Claims] 1. A head for recording or reproducing information on a recording medium, a carriage on which the head is mounted and configured to be movable with respect to the recording medium, and a motor for driving the carriage. In the recording or reproducing apparatus, elastic parts are provided at both ends of a movement range of the carriage on an axis parallel to a movement axis of the carriage, passing through a substantially center of gravity of the movable part including the carriage on a movement plane of the carriage. A recording or reproducing device characterized in that: 2. The motor is a voice coil motor, and the carriage has a protrusion that serves as a mover of the voice coil motor, and the protrusion has a contact portion that can come into contact with the elastic portion. The recording or reproducing apparatus according to claim 1, characterized in that: 3. The recording or reproducing device according to claim 2, wherein the elastic portion is formed in a stator of a voice coil motor.