JPS60182064A - Magnetic disc device - Google Patents

Abstract

PURPOSE:To decrease number of components and to miniaturize the device by using a spindle motor so as to rotate a magnetic disc and also move a carriage. 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 solenoids 18, 18a are not excited at all, the magnetic disc is loaded and it is possible for the device that the recording and reproduction is attained. On the other hand, one solenoid 18 is excited, a plunger 19 is attracted to the solenoid 18, a switching lever 16 is rotated counter clockwise, gears 22 and 34 are meshed with each other and the carriage 25 is moved in the direction of arrow F by the rotation of a cam disc 17. When the solenoid 18a is excited, gears 22a and 34 are meshed with each other and the carriage 25 is moved in the arrow H.

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, a rotation mechanism, a magnetic head seek mechanism, a magnetic head, and a control circuit.

Among these, a spindle morph is mainly used in a magnetic disk rotation mechanism, and a magnetic disk clamped by a spindle and a 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 movement, stopping, or positioning of the magnetic head is performed by the stepping motor via a steel belt, screw shaft, cam, or the like.

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

Further, the magnetic head is stopped and positioned 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 when the magnetic head is in a stopped state, the stepping motor remains energized, resulting in wasteful power consumption and generation of heat.

〔the purpose〕

The present invention has been made in order to eliminate the above-mentioned drawbacks of the conventional technology, and an object of the present invention is to provide a compact and low-cost magnetic disk device with an extremely simple structure.

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments 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 rolled steel plate 2C is laminated onto a silicon steel plate 2b, and a circuit pattern is formed on the side surface of the silicon steel plate 2b as indicated by arrow A, and various electronic components are attached thereto.

This silicon steel plate 2I) also serves as a shield plate.

A camshaft 15 and a positioning pin 40 are mounted on the rolled steel plate 2C.
A phototransistor 37a for detecting a write protect signal and an index signal is provided.
38a is provided.

Further, various mechanical parts are attached to the side surface of the rolled steel plate 2C shown 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 this panel 3 has an opening 3a (not shown) for inserting a magnetic disk, as shown in FIG.

As shown in FIG. 1, side plates 4 and 5 are attached to the left and right sides of the circuit board 2a to serve as guides when inserting a magnetic disk 71. In this case, guide layers 4a and 5a are formed, respectively.

A board 6 constituting a magnetic disk clamping mechanism is disposed above the side plates 4 and 5.

One end of an arm 8 is attached to the substrate 6 via a leaf spring 7 at a position facing the side plate 4, and the tip of the arm 8 is attached to a center cone 10 at a position facing the spindle 9. is provided.

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

Further, a bearing 18 is provided on the front surface of the substrate 6 at a position closer to the panel 3 side and closer to the side plate 4 side, and a shaft 12 is rotatably supported on this bearing 18. axis 12
A lever 14 is fixed on the outside of the 4-wall 3 (the d cam 13''7JζG is cut out and the other end is the front side).

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.

The board 6 also has a light emitting diode 1 for detecting write protect signals.
A diode 37 is attached at a position facing the phototransistor 37a.

On the other hand, what is indicated by the reference numeral 16 is a switching lever shown in Fig. 8 (
As shown in a) to (C), it has a Y-shape, and its base ends are connected to a pair of solenoids IB fixed on the circuit board 2a.
, IBa are rotatably connected to a common plunger 19 by a pin 20.

A bifurcated arm 16a of the switching lever 16.

A gear 22 is rotatably supported at the tip of one arm 16a of 16I3 via a shaft 21.

In addition, shafts 21a and 21b are provided at the tip of the other arm 16b.
The gears 22a and 22b are rotatably connected to lQl+
It is accepted.

Gears 22a and 22b are always in mesh.

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

A KFi 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).

In Figure 5 (a), the minimum radius of the spiral groove 23 is rol from the position of radius r to the start of the groove! 7: If the angle at I is α, then r-1(・α+
The spiral groove 23 is formed so as to be ro.

FIG. 5(b) shows the detached surface of the cam disk 17, and near its periphery, the groove 24 is formed at a constant angle θ (θ=3607n,
Grooves 24 having a V-shaped cross section are formed at equal intervals at angles (n is a positive number).

Note that the constant J (in FIG. 5(c)) is determined by the track density of the device and the pitch θ of the grooves 24.

The gear 17a of the cam 17 meshes with the gears 22 and 22b as shown in FIGS. The bearing is mounted on the shaft.

On the other hand, a carriage 25 is arranged above the cam disk 1γ and is slidably guided by guide bars 26 and 27, and the guide bars 26 and 27 are fixed on the circuit board 2a and mounted on a base 28. It is fixed at 29.

Although not shown, a magnetic head is attached to the carriage 25.

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

this steel ball By the spring member 31 provided on the side, P is always maintained.

Due to the pressing force, there is no play in the spiral groove 23.
being forced into a difficult position.

The gap 12 between the cam disk 17 and the carriage 25 is set to be smaller at any position than the distance 4□ between the cam disk 17 and the center of the steel ball 3o.

Therefore, when the cam disk 17 rotates in the direction of arrow E, the carriage 25 moves in the direction of arrow F, and when it rotates in the direction of G, the carriage 25 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 1 8 and 18a.

33a is provided, and the solenoid 1 8 , '18
, i are not energized, the plunger 19 is in an intermediate position.

On the other hand, a gear 34 is coaxially fixed to the lower part of the spindle 9, and this gear 34 is connected to the cam disk 1 as shown in FIG.
It is located in the same plane as 7.

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 the arrow as shown in . When both the solenoids 1 8 and 18a are not energized, the gear 34 and the gears 2 2 and 22a are as shown in FIG. 8(a).
As shown in FIG. 2, the cam disks 17 are not engaged and the cam disks 17 are 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 energized, the plunger 19 is attracted to the solenoid 18 side, the switching lever 16 is rotated counterclockwise in the figure, the gear 22 and the gear 34 are engaged, and the cam disk 11 is transmitted in the direction of the arrow J/\time i. The carriage 25 moves 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 1T rotates in the direction indicated by the arrow in the figure, causing the carriage 2
5 moves in the direction of arrow f-1 in FIG.

A switching signal to each solenoid 18, 18a is sent from the control device side.

In the cases shown in FIGS. 8(b) and 8(c), the carriage is in two-movement mode and no recording or writing is performed on the magnetic disk.

On the other hand, as shown in FIGS. 10(a) and 10(b), a stopper 35, which is a spring member for positioning and counting, is arranged below the cam disk 17, and its head 35a is fitted into the groove 24. Ru.

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

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

With the above configuration, when the head 35a of the stopper 350 is in the groove 24, it is possible to hold the carriage 25 at a predetermined position.

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 state is shown in FIG. 10(a).

When a signal is input to the solenoid 18 or 18a in this state, the state shown in FIGS. 8(b) and 8(C) is reached, the cam disc 17 is rotated, and the stopper 35 is rotated as shown in FIG. 10(b). is pushed downward.

As a result, the lower end portion 35I) blocks the slit portion 36a of the photo sensor 36, and the photo sensor 36 is turned off.

In this way, the solenoids ts and is are operated according to the number of signals from the control circuit side, and the carriage 25 moves accordingly.

Note that if the spiral groove 23 is configured so that when the cam circle 4Fi, 17 rotates by the pitch θ of the groove 24, it moves a distance of one track, the carriage will move in response to one signal from the host side. 25 moves by one track, and as a result, the photosensor 36 repeats turning on and off for the number of tracks moved, thereby making it possible to count the number of tracks.

Further, the relative position 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 one reference track 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 4a and 5a as guides.

In this state, when the lever 14 is rotated in the direction of arrow 1) in FIG. 2, the cam 13 is rotated and the arm 8 is pushed down toward the spindle 9.

When the lever 14 is rotated 90 degrees and the lever 14 comes to the position shown by the chain line in FIG.
Clamping of the magnetic disk is completed via the magnetic disk.

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

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

In the above-described embodiment, a gear mechanism which is a rotating body is used as the power transmission means, but it goes without saying that a transmission mechanism using a roller as a rotating body may also be adopted.

〔effect〕

As is clear from the above description, according to the present invention, since a single spindle motor is used to rotate the magnetic disk and move the carriage, it is possible to check the number of parts and downsize the entire device. , it is possible to provide a low-cost magnetic disk device.

When it is decreased, it becomes sharp.

[Brief explanation of the drawing]

The drawings 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, Fig. 4 is a bottom view, and Fig. 5 (a) is a cam. Figure 5 (b) is a plan view of the disc, Figure 5 (b) is a bottom view of the cam disc, Figure 5 (C) is a diagram showing the relationship between the radius and angle of the N-horn circular groove, and Figure 6 is a diagram showing the carriage and cam. FIG. 7 is a partially enlarged sectional view of FIG. 6, and FIG. 8 (a) to (C) U: Switching lever -
9 (a side view of the bow and switching mechanism, FIG. 10 (a), (+)) is an explanatory diagram showing the operation of the stotsuno (), 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. 1... Magnetic disk device 2... Spindle mork 6... Board 8... Arm 9...・Spindle 10...Center cone 16・
...Switching lever 17...Cam disc 1B, 18a,
・Solenoid 19... Plunger 25... Carriage 30... Steel Hole Patent Applicant Canon Electronics Co., Ltd. Figure 3 Figure 4 Figure 8 (Q) Figure 8 (C) D/160 Figure 8 (b) 719 Figure 9

Claims (1)

[Claims] The spindle is connected to a motor and rotates a magnetic disk, and the cam member is rotatably supported in the vicinity of the spindle and moves a carriage using a cam. 1. A magnetic disk device characterized in that the rotation direction of the cam portion can be rotated forward or reverse by rotation of the cam portion in a fixed direction.