JPS60182065A - Magnetic disc device - Google Patents

Abstract

PURPOSE:To decrease power consumption by using a solenoid and allowing a motor to select the movement of a carriage and the turning of a magnetic disc so as to apply power only when the moving direction of the carriage is switched. CONSTITUTION:A spindle 9 and a gear 34 incorporated therewith are supported freely rotatably on a circuit board 2a of a spindle motor 2 and a magnetic head is fitted to a carriage 25. When a solenoid 18 is excited, a plunger 19 is attracted to the solenoid 18, a switch lever 16 is turned counter clockwise, gears 22 and 34 mesh with each other and the carriage 25 is moved in the arrow F by the rotation of a cam disc 17. When the other solenoid 18a is excited, gears 22a and 34 mesh with each other and the carriage 25 is moved in the arrow H. A switching signal to the solenoids 18, 18a is fed from the controller.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a magnetic disk device, and more particularly to a magnetic disk device using a flexible magnetic disk.

[Prior Art] A conventional magnetic disk device of this type is roughly divided into components: a magnetic disk clamp mechanism, one rotation mechanism, a magnetic head seek mechanism, a magnetic head, and a control circuit. There is.

Among these, a spindle motor is mainly used in the magnetic disk rotation mechanism, and the magnetic disk clamped by the spindle and center cone is rotated by rotating the spindle directly or via a belt.

A stepping motor is connected to the seek mechanism of the magnetic head, and the movement, stopping, or positioning of the magnetic head is performed by the stepping motor via a steel heald, a screw shaft, a cam, or the like.

The magnetic hand is moved by converting the rotational motion of the stepping motor into linear motion.

The direction of rotation of the stepping motor is determined by the signal from the control circuit, and the stepping motor is rotated by an amount corresponding to the number of pulse signals, so the direction and distance of movement of the magnetic head are determined by this signal. .

Further, the stop 1 positioning of the magnetic head is performed by energizing the stepping motor and electrically holding it. Therefore, positioning accuracy mainly depends on the accuracy of the rotation angle of the stepping motor.

By the way, using separate motors for the magnetic disk rotation mechanism and the magnetic head seek mechanism as described above not only increases costs, but also limits the ability to make the device more compact and cost-effective.

Furthermore, even if the magnetic head is stopped, the stamping motor remains energized! The disadvantage of this is that it wastes power and generates heat.

[Purpose] The present invention has been made in order to eliminate the above-mentioned drawbacks of the conventional method, and it is possible to selectively move a carriage and rotate a magnetic disk with one motor, and perform the selection. It is an object of the present invention to provide a magnetic disk device configured such that switching means is performed by a solenoid driven by a switching signal, and wasteful power consumption can be prevented.

[Example] Hereinafter, the present invention will be described in detail based on the example shown in the drawings.

FIG. 1 and the following illustrate one embodiment of the present invention. A magnetic disk drive 1 according to the present invention is equipped with a spindle motor 2. As shown in FIG.

The spindle motor 2 has a circuit board 2a as shown in FIGS. 11 to 13, and a spindle 9 and a gear 34 integrated therewith are rotatably supported on the circuit board 2a.

As shown in FIG. 13, the circuit board 2a has a structure in which a silicon steel plate 2b is laminated with a rolled steel plate 2C.
A circuit pattern is formed on the side surface indicated by arrow A, and various electronic components are attached. This silicon steel plate 2b also serves as a shield plate.

A camshaft 15 and a positioning pin 40 are mounted on the rolled steel plate 2C.
Further, phototransistors 37a and 38 for detecting write protection signals and index signals are provided protrudingly.
A is provided.

Further, various mechanical parts are attached to the side surface of the rolled steel plate 2C as indicated by arrow B.

This circuit board 2a also serves as a board for the magnetic disk device 1.

A front panel 3 is attached to the tip of the circuit board 2a, and as shown in FIG. 2, this panel 3 has an opening 3a (not shown) for inserting a magnetic disk.

(As shown in FIG. 1, side plates 4 and 5 are provided on the left and right sides of the circuit board 2a to serve as guides when inserting a magnetic disk, and guide grooves 4a and 5a are formed respectively.

A board 6 constituting a magnetic disk clamping mechanism is attached to the upper part of the side plate 4.5.

One end of an arm 8 is attached to the substrate 6 via a leaf spring 7 at a position closer to the side plate 4, and a center cone IO is provided at the tip of the arm 8 at a position facing the spindle 9. There is.

Further, a light emitting diode 38 for index detection is provided on the arm 8 at a position facing the phototransistor 38a.

Further, on the board 6, there is a bearing 11 at a position closer to the front panel 3 side and a position closer to the side plate 4 side. is provided, on which a shaft 12 is rotatably supported. axis 12
A cam 13 is provided at the tip, and a lever 14 is fixed to the other end on the outside of the front panel 3.

The cam 13 and the arm 8 are always in contact, and the arm 8 follows the movement of the cam 13.

The cam 13 is operated by operating the lever 14.

Further, a light emitting diode 37 for detecting a write protect signal is attached to the substrate 6 at a position facing the phototransistor 37a.

On the other hand, the one indicated by the reference numeral 16 is switched and 8- is shown in FIG.
) to (C), it has a Y-shape, and its base ends are connected to a pair of solenoids 18.1 fixed on the circuit board 2a.
It is rotatably connected to a common plunger 19 of 8a by a pin 20.

Bifurcated arms 16a and 16b of the switching lever 16
A gear 22 is rotatably supported on the tip of one arm 16a via a shaft 21.

Further, a shaft 21a is provided at the tip of the other arm 16b.

Gears 22a and 22b are rotatably supported via 21b.

Gears 22a and 22b are fully engaged.

On the other hand, a cam disk 17 is mounted on the circuit board 2a above the switching lever 16 via a shaft 15.

A gear 17a is formed on the outer peripheral surface of the cam disk 17, and a spiral groove 23 having a V-shaped cross section is formed on the surface thereof, as shown in FIG. 5(a).

Now, in Fig. 5(a), the minimum radius of the spiral groove 23 is ro, and the angle from the position of a certain radius r to the starting end of the groove is α.
Then, as shown in Figure 5(C), r'=K・LX+
A spiral groove 23 is formed so as to be ro.

Furthermore, FIG. 5(b) shows the moving surface of the cam disk 17, and near its peripheral edge, a groove 24 is formed at a constant angle of 0 (0=360°/n,
Grooves 24 having a V-shaped cross section are formed at equal intervals at angles (n is an integer).

In addition, the constant in FIG. 5(C) is determined by the trunk sound level of the device and the pitch θ of the groove 24, and is in mesh with the gears 22 and 22b, as shown in FIG.
<-1' 6 (7) Arms 16a, 16bc7) The bases are rotatably supported on the support 15.

On the other hand, on the second side of the cam disk 17 there are guide bars 26 and 27.
A carriage 25 is arranged, which is slidably guided by guide bars 26, 27, which are fixed on the circuit board 2a, and which are fixed on stands 28, 29.

Although not shown in the drawings, the carriage 25 is equipped with an additional magnetic head.

As shown in an enlarged view in FIG. 7, the carriage 25 has a vertical through-hole 25a formed in its lower surface, and a steel hole 3o is rotatably fitted into the through-hole 25a.

This steel ball 30 is constantly pressed against the spiral groove 23 by a spring member 31 provided on the upper side of the carriage 25 with a pressing force of Pl without any backlash.

The gap -+22 between the cam disk 17 and the carriage 25 is the distance R1 between the cam disk 17 and the center of the steel pole 3o.
It is set to be smaller than 2l no matter how much 1δ.

Therefore, when the cam disk 17 rotates in the direction of arrow E, the carrying 25 moves in the direction of arrow F, and when it rotates in the direction of G, it moves in the direction of arrow H.

In addition, the plunger 19 of the solenoid has a return spring 33 on the side of each solenoid '18, lBa.
．． 33a is provided so that the plunger 19 is in an intermediate position when both solenoids 18 and 18a are not energized.

On the other hand, a gear 34 is fixed coaxially to the lower part of the spindle 9, and this gear 34 is located in the same plane as the cam disk 17 as shown in FIG.

Further, when power is supplied to the device and the spindle motor 2 rotates, the spindle 9 and the gear 34 are activated as shown in FIGS. 8(a) to (C).
It is rotated in the direction of arrow 1 as shown in . When both the solenoids 18 and 18a are not energized, the gear 34 and the gear 22.degree. 22a are not engaged as shown in FIG. 8(a), and the cam disk 17 is at rest.

In this state, the magnetic disk is attached and ready for recording and playback.

On the other hand, as shown in FIG. 8(b), one solenoid 1
8 is excited, the plunger 19 is solenoid/noid 18
The switching lever 16 is rotated counterclockwise in the figure, the gear 22 and the gear 34 are engaged, the cam disk 17 is rotated in the direction of arrow J, and the carriage 25 is moved in the direction of arrow F in FIG. .

When the other solenoid 18a is energized, the state shown in FIG. 8 (
As shown in C), the gear 22a meshes with the gear 34, and the cam disk 17 rotates in the direction indicated by the arrow in the figure, causing the carriage 2 to rotate.
5 moves in the direction of arrow H in FIG.

The switching signal to each solenoid 18.18a is controlled 4J:l
l Sent from the device side.

In the cases shown in FIGS. 8(b) and 8(c), the carriage is moving and no recording or reproduction is performed on the magnetic disk.

On the other hand, as shown in FIGS. 10(a) and (b), the cam disc 1
7, which is a spring member for positioning and counting.
The head 35a of the pad 35 is fitted into the groove 24.

The damper 35 is always pressed against the cam disk 17 by the force P2.

Further, a photosensor 36 for track counting is provided below the circuit board 2a near the lower end 35b of the stopper 35.

Note that instead of the photosensor 36, a mechanical switching means such as a microswitch may be used.

v Under the configuration as above, the head 35 a of the stopper 35
It is possible to hold the carriage 25 in place when it is in the groove 24.

At this time, the cam disk 17 is stopped in the state shown in FIG. 8(a'), and the photosensor 36 is in the on state.

This situation! u; is shown in FIG. 1O(a).

When a signal is input to the solenoid 18 or 18a in this state, the state shown in FIG. 8(b) occurs.

The state shown in (C) is reached, and the cam disk 17 is rotated to the 10th
As shown in Figure (b), the stopper 35 is pushed down.

As a result, the lower end portion 35b blocks the slit portion 36a of the photosensor 36, and the photosensor 36 is turned off.

In this way, the solenoids l 8 , 111g, and a are operated according to the number of signals from the control circuit side, and the carriage 25 moves accordingly.

Note that the spiral groove 2 is designed so that when the cam disk 17 rotates by the pitch θ of the groove 24, it can move a distance of one track.
3, the carriage 25 moves one track in response to one signal from the host side, and as a result, the photosensor 36 repeats turning on and off for the number of tracks moved and counts the number of tones. Is possible.

Further, the relative position 1δ between the magnetic disk and the magnetic head can be adjusted by adjusting the mounting position of the stopper 35.

Incidentally, as shown in FIG. 1, a photosensor 39 for detecting the reference trunk is provided on the circuit board 2a.

When the magnetic disk is inserted into the opening 3a of the front panel 3 from the direction shown by the arrow C in FIG. It is inserted to the insertion source using 5a as a guide.

In this state, when the lever 14 is rotated in the direction of the arrow in FIG. 2, the cam 13 is rotated and the arm 8 is moved to the spindle 9
Push down to the side.

When the lever 14 is rotated 90 degrees and comes to the position shown by the chain line in FIG. 2, the center cone l is moved.

Then, the spindle 9 completes clamping of the magnetic disk via the magnetic disk.

The magnetic disk can be ejected by performing the reverse operation to that described above.

With the magnetic disk mounted in this manner, the carriage is moved as shown in FIGS. 8(b) and 8(c), and recording and reproduction are performed on the target track.

In the dual embodiment, it is of course possible to adopt a gear mechanism that is a rotating body as the power transmission means, or a transmission mechanism that uses rollers as the rotating body.

[Effects] As is clear from the above description, according to the present invention, a switching means is provided that can selectively switch the rotational force of one motor between rotation of a magnetic disk and movement of a carriage. Since this switching means is structured so that it can be driven by a solenoid driven by a switching signal, power is consumed only when switching the moving direction of the gear ridge, resulting in low power consumption and low cost. Since it uses a solenoid, it can provide a low-cost device.

[Brief explanation of the drawing]

The figures are for explaining one embodiment of the present invention, and FIG. 1 is a plan view, FIG. 2 is a front view, FIG. 3 is a side view, and FIG. 4 is a bottom view.
FIG. 5(a) is a plan view of the cam disk, FIG. 5(b) is a bottom view of the cam disk, FIG. 5(C) is a diagram showing the relationship between the radius and angle of the spiral groove, and FIG. Figure 6 is a plan view showing the relationship between the galringe and the cam disc, Figure 7 is a partially enlarged sectional view of Figure 6, and Figures 8 (a) to (C) show the operation of the beam J change/he. An explanatory diagram, Figure 9 is a side view of the switching mechanism, and Figure 10 (
&), (b) is an explanatory diagram showing the operation of the stopper, FIG. 11 is a plan view of the circuit board, FIG. 12 is a side view of the circuit board, and FIG. 13 is a partially enlarged sectional view of the circuit board. l...Magnetic disk device 2...Spindle motor 6...Substrate 8...Arm 9...Spindle 10...Center cone 16.
...Jino change lever 17...Cam disc 18.18a
... Solenoid 19 ... Plunger 25 ... Carriage 30 ... Steel pole Figure 3 Figure 4 Figure 8 (Q) Figure 8 (C) Figure 8 (b) Figure 9

Claims (1)

[Claims] In a magnetic disk drive configured to selectively rotate a magnetic disk and move a carriage by switching the rotational force of one drive motor by a switching means, the J switching means is switched by a solenoid, A magnetic disk device characterized in that a carriage can be moved in any direction.