JPS60147978A - Head carriage seeking mechanism - Google Patents

Abstract

PURPOSE:To adjust accurately and easily track position by simple constitution by changing the supply current to a linear solenoid, and controlling the shift and drive of a head carriage. CONSTITUTION:An upper carriage 18 provided with a magnetic head 19 and a lower carriage 21 provided with a magnetic head 22 facing the head 19 are connected to a rod 14 through a splicer 15 that is connected to the rod 14 of the linear solenoid 13. When the supply current to the solenoid 13 is changed, the rod 14 is displaced in linear relation to the change of current until the current is saturated. Displacement driving of the carriage is controlled by simple constitution that does not require a step motor etc., and accurate adjustment of track position can be made easily.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a head carriage seek mechanism, and more particularly to a head carriage seek mechanism used in a magnetic disk drive.

[Prior Art] A magnetic disk device requires a head seek mechanism that moves the head by some means to determine the track position.

A stepping motor has been widely used as a drive source for such a head seek mechanism.

Conventional examples of such a head seek mechanism are shown in FIGS. 1 and 2.

In FIGS. 1 and 2, the reference numeral 1 designates the substrate of the apparatus, which is guided from side to side in FIG. 2 by a stepping motor 2 or screws 3 and 8-6, 6.

Both ends of the guide bar 6.6 are supported by support members 7.

A pulley 8 is fixed to the output shaft of the stepping motor 2, and a steel belt 9 whose both ends are fixed to the Herad carriage 5 side is partially wound around the pulley 8.

Therefore, when the pulley 8 of the stepping motor is rotated, the steel belt 9 is wrapped around it depending on the direction of rotation, and the head carriage 5 moves left and right to perform head seek.

On the other hand, the reference numeral 10 is a photo sensor for detecting the track "00" position, and the projection 5a of the head carrier 5 is inserted between the light emitting element and the light receiving element arranged above and below to detect the position. Detect.

The photosensor lO is attached to the substrate l side with a screw 12 via a mounting plate 11.

In a head seek mechanism having such a structure, the cost of the entire mechanism is increased due to the cost of the stepping motor, making it extremely difficult to reduce the cost.

In addition, 1. Adjustment of track roOJ position and track position adjustment are performed using Four Sensor 0. The method used is to adjust the position by rotating or moving the stepping motor Kiyu 2 in the direction of the arrow shown in FIG. 1, and then tighten the screws 3 and 12 to fix it.

For this reason, the position adjustment is delicate, and even if it is adjusted once, it has the disadvantage that the adjustment becomes incorrect when the screw is tightened.

[Purpose] The present invention has been made to eliminate the above-mentioned conventional drawbacks, and to achieve cost reduction and to enable accurate and easy track position adjustment. The purpose is to provide a second carriage seek mechanism.

[Example] Hereinafter, details of the present invention will be described in the example shown in the drawings.
The figure shows the entire spatula seek mechanism.

The symbol 13 in FIG. 3 is a near solenoid, and a connecting fitting 15 formed in a substantially U-shape is fixed to the tip of a rod 14 by a screw 16.

A carriage 18 is attached to the -L side of the connecting fitting 15 via a leaf spring 17, and a magnetic head 19 is fixed to the carriage 18.

Further, a lower carriage 21 is attached to the lower side of the connection fitting 15 with a screw 2o, and this carriage 2
1 has a magnetic head facing the magnetic head 19;
The door 22 is fixed.

On the other hand, a spring receiver 23 is fixed together with the leaf spring 17 by a screw 24, and a spring 25 is elastically mounted between the spring receiver 23 and the leaf spring 17.

In addition, the tip of the lower carriage 21 and the fixing part 26 of the device
A spring 27 is stretched between the two and has a structure as shown in FIG.

In FIG. 4, the reference numeral 2 indicates a cylindrical yoke, and inside this yoke 28 there is a coil bobbin 29.2.
9 are housed therein, and a coil 30 is wound around these coil bobbins.

Also, what is indicated by the reference numeral 31 is an extra piece, which is a permanent magnet 3.
Fixed on both sides of 2.

The roller 4 is slidably fitted through the coil bobbin 29 and the permanent magnet 32 at 33° C., and is a bearing.

In the linear solenoid 13 having such a structure, as shown in FIG. 5, there is a proportional relationship between the current I and the force F generated by flowing this current up to the saturation current value IO.

When the force F shown in FIG. 5 is generated, the rod 14 is moved and the carriage 18.21 is advanced through the fitting 15, and the spring 27 is compressed.

This compression generates a repulsive force F'.

This repulsive force F' causes the movement of the sowing rod 14 to become F'=F, and therefore the carriage 18, 21 and the magnetic head 1
The movement on 9.22 also stopped.

If the movement of the magnetic head 19.22 at this time -1, that is, the contracted length of the spring 27 is set to X, then F''=kX (k is a spring constant), and F=F' or K k/K)X=CX.

Note that C is a constant.

- That is, the amount of movement X of the magnetic head 19, 22 is proportional to the current I flowing through the coil 30.

By the way, FIG. 6 shows a drive circuit for the beam near solenoid 13.

In FIG. 6, the reference numeral 34 is a pinary counter IC, and its outputs Qx"Qe are connected to analog switches 35 to 40, respectively.

Reference numerals 41 to 46 indicate resistors R1 to R6, and reference numeral 47 indicates a variable resistor.

Further, reference numeral 48 indicates a variable voltage source, and 49 indicates a variable resistor.

Next, the operation of the seek mechanism will be explained with reference to FIG.

First, the binary counter IC3 is activated by the reaction signal.
Decide whether to increase or decrease the count of 4. Subsequently, when the step signal is input to the clock terminal of the binary counter IC34, a count number equal to the number of tracks appears on the outputs Ql-Q6.

Here, the current flowing through the resistor R, -R6, is 1. 〜■6, I 6 = 2 I 5 = 4 I 4 = 8
If I 3 =16I2=32I'x, then Vcc=
R11f=R2I2=R3I3=R4I4=R5
I5 = R6I6, Rl = 32 V CC/
I 6 , R2= 1 6 V Q C/ I 6
, R3=8 V CC/I 6 .

R4=4Vcc/I6, R5=2Vcc/I6.

R6=vCC/I6.

Therefore, R1= 2 R2= 4 R3= 8 R4=1
6R15=32R6.

That is, by determining the values of the resistors R1 to R6 as described above, it is possible to create a digital current value proportional to the count number, that is, the number of tracks.

Further, the power supply voltage Vcc is the output of the variable voltage source 48,
It can be made variable by a variable resistor 49.

Also, since there is a relationship of XocFccIcxVcc, Vcc
By making variable, the amount of movement of the magnetic head can be changed, and thus the track position can be adjusted.

[Effects] As is clear from the above description, according to the present invention, a linear solenoid is used as a drive source, and a structure is provided in which the current value supplied to the linear solenoid can be freely changed according to the track position. Adoption le (because there is, tiger 1.
The "00" adjustment and the trough position adjustment can be performed extremely easily and accurately just by operating the variable resistor.

[Brief explanation of drawings]

FIGS. 1 and 2 are a plan view and a bottom view explaining a conventional device, and FIGS.
Figure 3 is a side view of the seek mechanism, Figure 4 is a partially longitudinal side view of the beam near solenoid, Figure 5 is a diagram showing the relationship between the current and output of the beam near solenoid, and Figure 6 is a block diagram of the drive circuit. It is. 13... Linear solenoid 14... Rod 18.21... Carriage 19.22... Magnetic head 27... Spring 34... Binary counter IC 35-40... Analog switch 41-46. ...Resistance 47.49...Variable resistance 2 48...Variable voltage source

Claims (1)

[Claims] A head carriage seek mechanism characterized in that a linear solenoid is used as a drive source for moving a magnetic head, and the current supplied to the linear solenoid can be changed.