JPH05182344A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To easily and extremely finely adjust the azimuth of a magnetic head by making one of guides supporting a carriage an elastic supporting structure and making one end of the other guide position-adjustable. CONSTITUTION:The carriage 1 is elastically supported between guide bars 23, 24 through a roller 21 by a preload 22 and magnetic heads 8, 9 are provided on the tip of a head arm 3. The end part 23a of the first guide bar 23 is fixed to a chassis 11 with a screw 28 by using a fixing member 27 and an adjusting screw 29 is provided on the end part 23b side. When the azimuth is adjusted, the end part 23a of the guide bar 23 is fixed and the screw 28 of the end part 23b side is loosened and the adjusting screw 29 is rotated and the guide bar 23 is rotated with the end part 23a as a center and the entire carriage is moved in the direction of the arrow R. Thus, the azimuth of the magnetic head is remarkably reduced by changing the angle of the carriage 1.

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, particularly to a recording medium by moving a recording / reproducing head to a desired track position among a plurality of tracks formed on a disk-shaped recording medium. The present invention relates to a recording / reproducing apparatus for recording / reproducing information, and particularly to an azimuth adjusting mechanism for guiding a carriage in an accurate direction (azimuth) in such a recording / reproducing apparatus.

[0002]

2. Description of the Related Art As a recording / reproducing apparatus of this kind, a floppy disk drive device (hereinafter referred to as FDD) for recording and reproducing information on a flexible magnetic disk used as an external storage device of a computer or so-called floppy disk. There is.

In recent years, FDD has been rapidly reduced in size and increased in capacity, and accordingly, high density recording has been demanded. For this reason, the recording wavelength is further shortened (the recording linear density is increased), and it is required that the accuracy of the recording / reproducing gap angle (azimuth) of the magnetic head between the devices is very high.

FIG. 7 is an exploded perspective view of a conventional apparatus. Reference numeral 1 indicates a carriage for moving a magnetic head, and the carriage 1 is guided by a guide bar 2 by a driving means (not shown). And is driven along the radial direction of the medium 10 (direction of arrow S). A first magnetic head 8 for recording / reproducing is fixed to the lower surface of the medium 10 on the upper surface of the tip of the carriage 1, and a head arm 3 is arranged on the carriage 1 in a vertical direction via a supporting member 5. It is cantilevered by a leaf spring 4 so that it can be elastically displaced, and is fixed to the carriage 1 via a support member 5 by a fixing screw 7 while being biased by a pressing spring 6 so as to be pressed downward. ing. A second magnetic head 9 for recording / reproducing on the upper surface of the medium 10 is fixed to the lower surface of the tip of the head arm 3.

[0005]

In the structure as described above, the magnetic heads 8 and 9 are previously positioned and fixed to the carriage 1 and the head arm 3, but these are mounted on the FDD chassis (not shown). When fixing it will be attached with some error,
This causes azimuth. Therefore, the azimuth (angle) of the FDD magnetic head in which the data is written and the FDD magnetic head in which the data is read
However, there is a drawback that the reproduction output is lowered and the reading margin is reduced due to the deviation of the position, resulting in a device with low reliability.

Therefore, an object of the present invention is to solve the above-mentioned drawbacks and to provide a recording / reproducing apparatus having means capable of adjusting the carriage direction so as to guide the carriage in an accurate direction (direction). ..

[0007]

In order to solve the above-mentioned problems, the present invention provides a recording / reproducing apparatus for recording or reproducing by contacting a head with a rotating recording medium, the recording medium having the head mounted thereon. A carriage movably arranged in a radial direction with respect to the first carriage, and a first guide for guiding the carriage.
And a second guide means, a plurality of rollers that support the carriage and roll the first and second guide means by sandwiching the first and second guide means at an appropriate angle in the radial direction, and a plurality of rollers.
Support means for elastically supporting one of the first guide means with respect to the second guide means, and one end portion of the first guide means being fixed and the other end portion being movable so that the orientation of the first guide means. The recording / reproducing apparatus is characterized by having guide means for adjusting the direction and direction adjusting means.

[0008]

According to the present invention, the azimuth of the magnetic head can be made extremely small with respect to the recording medium, and good recording and reproduction can be carried out while preventing lowering of reproduction output and reading margin.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of an embodiment of a recording / reproducing apparatus according to the present invention, and FIG. 2 is a perspective view of essential parts of the embodiment. FIG. 3 is an operation diagram when the guide bar is variable.

In FIGS. 1 and 2, a disc cassette (not shown) is guided by a cassette holder 12 arranged in a chassis 11 and mounted in the cassette holder. The medium 10 is mounted inside the disc cassette. A shutter opening / closing lever 16 for opening / closing a shutter for covering the opening of the medium 10 and for loading / unloading the disc cassette is provided at a corner portion of the cassette holder 12. Magnetic heads 8 and 9
In order to bring the medium into contact with or away from the medium 10, the head load assembly 17 is provided with a voice coil motor (hereinafter VC).
M) 13 is disposed adjacent to M. The head load assembly 17 has a solenoid, and the magnetic heads 8 and 9 contact the recording surface of the medium 10 when energized, and the magnetic heads 8 and 9 separate from the surface of the medium 10 when the energization is turned off.

Next, the magnetic head seek mechanism will be described. The magnetic head seek mechanism uses the VCM 13 as a drive source.
And has a magnet 1 in the yoke 18 of the VCM 13.
9 and a coil 20 attached to the carriage 1 is further provided. When a current flows through the coil 20, the carriage 1 moves due to the interaction with the magnetic field of the magnet 19. A head arm 3 is attached to the carriage 1.

Further, the carriage 1 has a plurality of rollers 2
1 is attached at an arbitrary angle, preload 22
The roller 22a and the roller 22a to the first guide bar 2
3 and a load spring 22b for pressing against the second guide bar 24, the carriage 1 is elastically supported between the guide bars 23 and 24 via the roller 21, and the guide bar 23 , 24, seeks in a direction toward and away from the center of the medium 10 and can move to a predetermined track position.

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

Further, a linear scale 15 is provided in parallel with the guide bars 23 and 24, the linear scale 15 is fixed to the chassis 11, and slits 15a are formed in the linear scale 15 at equal intervals. A sensor 25 attached to the carriage 1 (the linear scale 15 and the sensor 25 are referred to as an encoder 26)
It is possible to detect the movement amount of the carriage 1, that is, the movement amounts of the heads 8 and 9 by calculating the number of slits that have passed through the light receiving element that receives the light emitted from the light emitting element of the above through the slit 15a. ..

The end portion 23a of the first guide bar 23 is fixed to the chassis 11 with a fixing member 27 with a screw 28, and the end portion 23b is adjusted with an adjusting screw 29 and a fixing member 27 through the chassis 11. It is installed.

Next, a method of adjusting the azimuth (angle) of the magnetic head will be described. End 23a of the first guide bar 23
Is fixed to the chassis 11 and the screw 2 on the end 23b side
When 8 is loosened and the adjusting screw 29 is rotated, the first guide bar 23 rotates around the end portion 23a, so that the entire carriage 1 moves in the direction of arrow R in FIG. Here, since the carriage 1 is elastically supported in the direction of arrow A by the preload 22 via the roller 21 as shown in FIG. 3, the angle of the first guide bar 23, that is, the first guide bar 23 and the second guide bar 23. There is no problem even if the parallelism of 24 changes.

Generally, in azimuth, an azimuth signal contained in a specific track of a reference disk is reproduced and measured by a magnetic head. Therefore, while observing the azimuth signal, the angle of the carriage 1 is changed by the above-mentioned method to make a magnetic field. The azimuth of the head can be reduced to 0 or extremely small. Then, the end portion 23b of the first guide bar 23 may be fixed to the chassis 11 using the fixing member 27 and the screw 28.

The adjusting screw 29 may be a coarse screw, but by using a fine screw having a small amount of movement with respect to rotation, the azimuth adjustment can be performed more easily. Next, the control of the recording / reproducing apparatus of the present invention will be described with reference to the block diagram shown in FIG. In the figure, the moving destinations of the magnetic heads 8 and 9 are determined through an input means (not shown) such as a keyboard or a memory (not shown) of a microprocessor, and a moving command is sent from the signal line a. 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 by the interaction between the current flowing through the coil 20 and the magnet 19.
When the carriage 1 is moved, the sensor 25 provided integrally with the carriage 1 and the linear scale 15 fixed to the chassis 11 act to detect information about the movement of the carriage 1 by, for example, two information whose phases are shifted by 90 °. The signals are output from the encoder 26 as signal gammas φA and φB. The output signal of the encoder 26 is first input to the differential amplifier 103 in the subsequent stage, and rough positioning of the head position is performed with reference to the intersection of both signal waveforms, that is, the point where the phase difference is zero, and the output of the differential amplifier 103 is rough. Position signal b
Is input to the adding circuit 101 in the subsequent stage.

The output signal of the encoder 26 is input to the comparators 104 and 105 in the subsequent stage and compared with a predetermined value, and then the output is input to the track counter 106 in the subsequent stage to count in the forward or reverse direction. The microcomputer 10 outputs the output as a current position signal c indicating the position of the head on the track.
Input to 0.

Further, information on the moving speed of the carriage detected by the electronic tachometer 150 is used as the phase compensation circuit 10.
8 and the phase-compensated signal d is added to the adder circuit 101.
To prevent oscillation due to phase shift. The signal f is a microcomputer 100 for speed control.
Entered in.

Further, a signal relating to the moving speed of the carriage detected by the electronic tachometer 150 is input to the differentiating circuit 109 and compared with a predetermined value in the comparator 110 at the subsequent stage. 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, for example, writing is prohibited, and data destruction due to impact is prevented.

Further, the servo information of the track recorded on the medium 10 is detected by the magnetic heads 8 and 9 itself, amplified by the amplifier 111 in the subsequent stage, and input to the position error detection circuit 112, where the track following position is detected. 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 directly input to the adder circuit 101, the current position signal c, the speed signal f input to the microcomputer 100, and the speed change f Accurate position control of the carriage 1 and the magnetic heads 8 and 9 moved integrally with the carriage 1 is performed according to the shock prevention signal e and the track following servo signal g. For example, the count value of the target position in the microcomputer 100 and the sensor 25 When the count value obtained by the track counter 106 coincides with the movement, the signal a becomes “0” and the differential amplifier 103 becomes “0”.
At that time, that is, the head stops at the track position corresponding to the predetermined slit position.

In this way, head position control can be performed. At this time, according to the above-described structure capable of adjusting the azimuth of the magnetic head of the present invention, the data written F
The azimuth (angle) of the DD magnetic head and the FDD magnetic head for reading the same can be extremely reduced.

Next, referring to FIG. 5 showing another embodiment, as shown in FIG. 5, an end portion 23 of the first guide bar 23 is formed.
The same effect can be obtained by disposing the adjusting screw 29 on the side of the end portion 23a with b as the fixed side.

Further, the structure in which the adjusting screw 29 is rotated from the side has been described above, but in consideration of workability, as shown in FIG.
Even with a structure in which 0 is used to move the first guide bar 23 obliquely from above, the azimuth can be easily reduced.

[0028]

As is apparent from the above description, according to the recording / reproducing apparatus of the present invention, the elastic support structure of one roller for guiding the carriage and the structure for changing the position of one end of the guide bar are combined. Thus, the azimuth of the magnetic head can be easily made extremely small, and a good and highly reliable recording / reproducing apparatus can be realized.

[Brief description of drawings]

FIG. 1 is a plan view of a recording / reproducing apparatus of the present invention.

FIG. 2 is a perspective view of a main part of the recording / reproducing apparatus.

FIG. 3 is a front view showing a structure for guiding a carriage of a recording / reproducing apparatus.

FIG. 4 is a block diagram of a head position control circuit used in the recording / reproducing apparatus.

FIG. 5 is a perspective view showing a main part of another embodiment.

FIG. 6 is a perspective view showing another embodiment of the adjusting screw portion.

FIG. 7 is an exploded perspective view of a conventional device.

[Explanation of symbols]

 1 Carriage 8 First Magnetic Head 9 Second Magnetic Head 13 Voice Coil Motor 21 Roller 22 Preload 23 First Guide Bar 24 Second Guide Bar 29 Adjustment Screw

Claims (3)

[Claims] 1. A recording / reproducing apparatus for recording or reproducing by contacting a head with a rotating recording medium, the carriage having the head mounted thereon, the carriage being arranged to be movable in a radial direction with respect to the recording medium, and the carriage. First and second guiding means for guiding the carriage, and the first supporting means for supporting the carriage.
And a plurality of rollers that roll by sandwiching the second guide means at an appropriate angle in the radial direction, and a support means that elastically supports one of the plurality of rollers with respect to the second guide means. A guide means azimuth adjusting means for fixing one end of the first guide means and movably moving a position of the other end of the first guide means to adjust the azimuth of the first guide means. Playback device. 2. The recording / reproducing apparatus according to claim 1,
The recording / reproducing apparatus, wherein the guide means azimuth adjusting means has an adjusting screw arranged at the end of the first guide means so as to come into contact with the guide means from outside and push the end inward. 3. The recording / reproducing apparatus according to claim 1,
Recording / reproducing, characterized in that the guide means azimuth adjusting means has an adjusting screw arranged so as to abut the guide means at an end portion of the first guide means from an obliquely outer side thereof and push the end portion inward. apparatus.