JPH02162566A - Disk device - Google Patents

Abstract

PURPOSE:To lower a motor in height and to thin the device accordingly by forming an opening part on a motor driving control circuit board in an area of a motor opposite to a rotor and providing this opening part with a coil for the motor. CONSTITUTION:The coil 112 for exciting the DD motor is disposed on a stator yoke 111 in the opening part 300a cut on the PCB (driving circuit board) 300 opposite to the rotor 115, and the PCB 300 is directly connected with a pattern 112a for coil terminal. There is the yoke 111 fixed integrally with a base 100, which is then fixed with a housing 111b. A spindle shaft 114 for the motor is supported in the center of a bearing, above which a rotor yoke 115 is fixed. A magnet 115a is fixed on the back side of the yoke 115 to be disposed via an air gap in opposition to the coil 112. By constituting in such a way, the height of the motor is lowered by a dimension corresponding to the thickness of the circuit board.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disk device that records or reproduces information on or from a disk by rotating a disk as a recording medium.

[Prior Art] A typical example of this type of device is a floppy disk device (hereinafter abbreviated as FDD) that magnetically records or reproduces information on a magnetic disk of a flexible disk-shaped magnetic recording medium called a floppy disk. There is. In FDD, a magnetic disk can be inserted and ejected,
A magnetic disk is rotated by driving a motor, and a magnetic head is brought into sliding contact with the magnetic disk to perform recording and reproduction. The structure of an FDD consists of a base that supports each component of the FDD, a disk insertion and ejection mechanism that inserts and ejects a magnetic disk, a disk rotation drive mechanism that rotates the magnetic disk using a motor, and a magnetic head that rotates the magnetic disk. A head seek mechanism that moves the head to an arbitrary track position along the radial direction, and a head load mechanism that loads and unloads the magnetic head onto and from the disk are provided.

In addition to this, there is also a main control circuit board with a control circuit for controlling the entire FDD, a motor control circuit board with a drive control circuit for the disk drive motor, a connector for interface with host equipment, and a power supply. connectors, etc. are provided.

Such FDDs are used as external storage devices for host electronic devices such as personal computers and word processors, and are also configured as independent devices.
In many cases, it is integrated into the main body of the host electronic device. In recent years, electronic devices incorporating FDDs have become smaller and more portable, and in response to this, FDDs have become more compact and portable.
There is a strong demand for smaller, thinner, and lighter devices.

[Problems to be Solved by the Invention] Incidentally, in the configuration of an FDD, a disk rotation drive motor occupies a large space. In the conventional structure of this motor, the motor includes a rotor supporting a magnet, a coil, a motor drive control circuit board, a stator yoke, etc., arranged one above the other. The coil is provided on the drive control circuit board. Note that a Hall element and an index detection sensor attached to the motor and detecting the excitation switching timing of the coil are provided on the drive control circuit board. A chucking mechanism is provided on the motor to removably hold the disk.

Since the thickness of the FDD is influenced by the height of the motor, it is important to reduce the height of the motor as much as possible.
This is extremely important in making the device thinner. An object of the present invention is to reduce the height of a disk rotation drive motor in not only an FDD but also a disk device so that the disk device can be made thinner.

[Means for Solving the Problems] In order to solve the above problems, according to the present invention, in a disk device that records or reproduces information by rotating a disk as a recording medium by driving a motor, 5. Driving the motor. A structure is adopted in which an opening is formed in a region of the control circuit board facing the rotor of the motor, and the coil of the motor is provided within this opening.

[Function] According to this structure, in the motor configuration, the coil, which was conventionally provided on the drive control circuit board, is provided in the opening of the circuit board, so the size corresponding to the thickness of the circuit board is reduced. Only the height of the motor can be lowered.

(The following is a margin) [Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings. In this embodiment, for the sake of convenience, a floppy disk drive device (hereinafter referred to as FDD) which is incorporated into an electronic device such as a computer or a word processor to record and reproduce information will be described as an example.

The FDD of the present invention is formed as a small and thin housing as shown in FIGS. 1(A) to 1(D). Number 1 in the figure
00 is a base that supports the constituent members of the disk device, has a U-shaped cross section with an open top, and is made of metal, etc. In this embodiment, this base is F.
It forms the bottom surface of the DD, and all of the various constituent members are accommodated between this base and a shield cover as a lid described later.

FIG. 1(C) shows the back side of the FDD, and the bottom mounting portions 101 for attaching to host equipment such as computers and word processors are provided at three locations on the rectangular back surface as through holes for screw fixing. It is formed. At these three bottom mounting positions, cutouts 102 are formed to provide a relief for mounting at rectangular positions. In other words, the number of attachment points, which were conventionally provided at four locations, has been reduced to three, and the remaining one attachment location is formed as a recess.

The base 100 is cut or cut into various shapes in order to attach each component of the disk device, and this will be explained each time as necessary.

The base 100 has a round notch near its center, into which a stator yoke 111 made of a magnetic material such as an iron plate provided on the lower surface of a motor 110 of a disk drive motor to be described later is fitted and fixed flush with the base 100. .

In particular, as shown in FIG. 3(B) and FIG. 4(A) to (D), the stator yoke 11 is flush with the base and the lower surface of the base.
A PCB (printed circuit board) 300 provided with a DD motor drive control circuit (not shown) is placed on top of the top surface of the PCB 1 .

To reduce the thickness of FDD, DD motor 1 on PCB
The portion facing the rotor 115 of No. 10 is cut out as an opening 300a, so that the DD motor is exposed. As is clear from the figure, the rotor 115 of the PCB 300
For example, six coils 112 for exciting the DD motor are arranged at equal angular intervals on the stator yoke 111 within the opening 300a cut out facing the FG PCB. The coil 112 is connected to the terminal connection pattern 112a by, for example, soldering, and the coil 112 is connected to the motor drive control circuit on the PC'B 500 by directly connecting the coil terminal to the PCB 300. Coil 112 without using a separate lead wire etc.
By directly connecting the coil terminal (coil terminal) to the motor drive control circuit on the PCB 300, cost reduction and space saving can be achieved. Further, two Hall elements 113 are arranged between the coils 112 to detect the excitation switching timing of the coils. The terminal portion of the Hall element 113 is soldered to the PCB 300, and its detection portion protrudes from the PCB 300 so as to face the rotor magnet 115a, and is disposed within the opening 300a.

The DD motor 110 has a stator yoke 111 integrally fixed to the base ioo at the bottom, and a housing 111b that accommodates a bearing 111a in the stator yoke.
is fixed. A spindle shaft 114 of the DD motor is supported in the center of this bearing, and a rotor yoke 115 is fixed to the upper part of this spindle shaft 114.

A magnet 115a is fixed to the back side of the rotor yoke 115, and the coil 11
It is arranged to face 2. In addition, Fig. 4 (D
), an FG (frequency generator) pattern 112b is provided on the top of the coil 112 to detect the rotation speed of the coil, and this FG pattern and the driving circuit board 300 is also connected, for example, by soldering.

On the front side of the base 100 in the figure is a disk cassette 150.
A front panel 120 having an insertion/ejection opening is attached to each side 1 of the U-shaped profile of the base 1oo.
00a and 100a are connected on one side to form the front surface of the casing.

Furthermore, as shown in FIGS. 5(A) and 5(B), a shutter 122 is attached to the inside of the front panel 120 to close the cassette insertion/ejection port 121 when not in use to prevent foreign matter such as dust from entering. There is. This shutter has a bearing provided above the cassette insertion/ejection port 121.
24 so as to be rotatable, and furthermore, it is provided with a downward rotational habit that always closes the cassette insertion/ejection port via a weak coil spring 125 as a first elastic member. When no external force is applied to the shutter, this shutter always hangs downward and closes the cassette insertion/ejection port 1.
21 are closed. A brake spring (plate spring) 12 as a second elastic member is located above the shutter 122.
3 is fixed at one end to the inside of the front panel 120. The brake spring 123 is made of a material with a relatively large elastic modulus and is bent downward as shown in the figure, and when the cassette is attached and a cassette guide (described later) is pressed downward, the brake spring 123 bends downward as shown in the figure. The tip of the cassette does not reach the shutter 122, but comes into contact with the shutter 122 only when loading and unloading the cassette, and biases the shutter 122 in the closing direction. The elastic modulus of this brake spring is selected to provide a stronger spring than the coil spring 125.

Next, Fig. 6, Fig. 7 (, A) to (C), Fig. 8 (A),
The disk attachment/detachment and head loading mechanism will be explained using (B).

In the FDD device of this embodiment, the disk is chucked and the magnetic head is loaded by loading the disk cassette 150, and the magnetic head is unloaded and the disk cassette is ejected by operating the eject button.

In the figure, the disk cassette (
A cassette (hereinafter abbreviated as a cassette) 150 is loaded and discharged.

An ejector, generally designated by reference numeral 160, is provided inside the base 100 having a U-shaped cross section. Further, a slide plate 162 is disposed on the base 100 so as to be able to slide on the base in directions A and B, guided by a plurality of bent portions 100m protruding from predetermined positions on the base. A part of the slide plate 162 has a notch 1.
62a is formed. With the entire tension coil spring 162b facing this notch 162a, one end of the tension coil spring 162b is fixed to the base 100, and the other end is the slide plate 162.
is attached to. This tension coil spring 162
By pulling b in direction B, the slide plate 162 is held in a predetermined position on the base 100 as described later through the above-mentioned bent portion 100m provided on the base, and the front end of the slide plate 162 in the figure is Operation button (eject button) 161 integrally attached to
By pushing in, it is possible to slide in the direction A with respect to the base 100 against the bias of the tension coil spring 162b.

Further, as shown in FIGS. 8(A) and 8(B), guide grooves 162e are cut out and formed in guide plates 162d provided vertically on both sides of the slide plate 162. As is clear from the figure, the outer end portion of the guide groove 162e is parallel to the base 100 and is formed to descend obliquely from there.

Similarly, FIGS. 8(A) and 8(B) show the cassette guide 152.
(See also FIG. 3(A)) The cassette guide 152 accommodates and guides the cassette 150, and its shape is formed into a thin housing that fits perfectly within the base 100. , the lower surface is cut out over almost the entire area so that the cross section is almost U-shaped.

Guide grooves 162e formed in the guide plates 162d of the slide plate 162 on both sides of the cassette guide 152
A dowel 152a is provided to protrude outwardly at a position where the dowel 152a is engaged with the dowel 152a. Furthermore, dowels 152b are protruded from the center of both sides of the cassette guide 152, and are fitted into guide grooves 1000 formed on both sides 100a of the base 100.

An ejector 160 is attached near the rear end of the slide plate 162. That is, a shaft 160a for supporting the ejector 160 is provided protruding near the end of the base 100 on the side opposite to the front panel 120 side. An ejector spring 164 is loaded on the shaft 160a, and the ejector 160 is rotatably supported around the shaft I Boa. One end of the ejector spring 164 is locked to the ejector 160, and the other end is locked to the base 160.
A spring retainer formed on the side surface 100a of the 0 is housed in the spring holder, thereby giving the ejector a counterclockwise rotational behavior in the figure.

In particular, as is clear from FIGS. 7(A) and 7(B), the ejector 160 consists of an arcuate base portion 160b and an arm portion 160c, and the arm portion 160c is provided with a cassette shutter opening and pushing arm 160d. The base side end surface of the arc-shaped base tsob is the base side surface 10
0a to regulate the standby position of the ejector 160.

A protruding latch portion 162c is formed at the end of the slide plate 162 on the ejector 160 side. As shown in FIG. 7(A), this latch portion 162c is caught on the base portion 160b of the ejector 160 in the standby position, thereby causing the base 100 and the slide plate 162 to
The slide plate 162 is maintained in the latched state against the bias in the direction B of the tension coil spring 162b stretched between the two. When the ejector 160 is moved to the operating position by the cassette 150 as shown in FIG. 7(B), the ejector 160 separates from the latch portion 162c, and the slide plate 162 slides in the direction B by the tension of the tension coil spring 162b. do.

Next, the head seek mechanism will be explained. As shown in FIGS. 9 and 10, a rear wall 100b is integrally formed on the opposite side of the base 100 from the front panel 120, standing vertically from the bottom surface of the base 100. As shown in FIGS. The stepping motor 1 is connected to the hole formed in the rear wall 100b.
A screw shaft 131 directly connected to the output shaft of 30 is inserted through the screw shaft 131, and the end of the screw shaft 131 on the motor 130 side is supported by a sliding bearing 135.
A stepping motor 130 for driving a recording/reproducing head assembly 200, which will be described later, is attached with the tip of a screw shaft 131 being supported by a pivot bearing 100d provided on a support plate 100f cut and raised at a predetermined distance from the top. As shown in FIG. 9, a spiral screw groove 131a is formed in the screw shaft 131 of the stepping motor, and a needle bin 202 protruding from the head assembly 200 engages with this screw groove 131a as described later. be done. Further, a washer 132 is attached to a portion of the screw shaft 131 in the vicinity of the sliding bearing 135 to prevent lubricating grease or foreign matter from entering the same bearing 135 from other portions of the screw shaft 131. There is.

As shown in FIGS. 10 and 11, the head assembly 200 has a part of the head carriage attached to a guide bar 133 installed between the rear wall 100b of the base 100 and a support plate 100e cut up from the base. The base 100 is movable back and forth via an attached sliding bearing 134.
is placed above.

The head assembly 200 is provided with a head carriage 201a having a helad arm 201, the sliding bearing 134 is attached to one side of the head carriage 201a, and a needle pin 202 is provided to the other side,
This needle pin 202 is connected to the stepping motor 13.
It is engaged with the screw groove 131a of the screw shaft 131 of No. 0. With this structure, the stepping motor 130
, the screw shaft 131 rotates, the needle bin 202 is pressed through the screw groove 131a, and the head assembly 200 is reciprocated. A magnetic head for surface 0 is fixed on the lower side of the head carriage 201a, and a magnetic head for surface 1 is supported on the upper side via the helad arm 201. A head arm 201 having a single-sided head can approach and move away from the disk, and via a damper mechanism or solenoid mechanism described below, the single-sided head softly lands on the disk to record or reproduce information on the disk. I do.

First, FIGS. 12, 13 (A), (B), and (C) and FIGS. 14 (A) and (B) illustrate the damper mechanism 170.

The bar mechanism 170 consists of a damper 171 and a damper arm 172, and the damper is attached to the base 100 via a plate 173. For mounting the damper, the plate 173 is bent to the hook, and the base 100
is screwed to the bottom of the Damper installation is on board 17
A support shaft 174 projects from the rear wall side of the base 3 in parallel with the base side wall, and the damper arm 17 is attached to this support shaft 174.
2 is rotatably supported on a bearing. A coil spring 175 is wound around the support shaft 174, and one end of the coil spring 175 is supported on the side wall of the base of the plate 173 for mounting the damper, and the other end is supported on the damper arm 172 so that the base 100 is always attached to the damper arm 172. It gives the habit of rotating towards the bottom of the body. Bending portion 1 protruding from damper arm 172
72a is fitted into a notch formed in the rotary piece 171a of the damper 171, whereby the damper arm 1
72 and damper 171 are interlocked. Further, the damper arm 172 is provided with first and second pivots 176 and 177, and the first pivot 176 is attached downward to the tip of an arm 176a that protrudes toward the disk from the center of the damper arm. and the second pivot 1
77 is attached from the damper arm 172 toward the base. The first pivot 176 transmits the upward movement of the cassette guide 152 to the damper arm 172, and the second pivot 177 transmits the upward movement of the cassette guide 152 to the damper arm 172.
It comes into contact with the bottom surface of the damper arm and serves as a lower stopper for the damper arm. The positional relationship between the two pivots 176 and 177 is such that when no cassette is inserted into the disk device, the first pivot 176 comes into contact with the upper surface of the cassette guide 152, and when a cassette is inserted and installed, the second pivot 177 abuts against the bottom surface of the base 100, the first pivot 176 moves toward the cassette guide 1.
It is set so that it floats by a gap G from the top surface of 52. This gap G is provided so that when the cassette is inserted and the head is in contact with the disk, the damper arm 172 is reliably separated from the head arm 201 without receiving any external force, and does not interfere with the movement of the head arm. It is set up like this.

Further, FIGS. 15 and 16 (A), (B), and (C) show solenoid assemblies, which are used as an alternative to the damper assembly described above. The selection of whether to use a damper mechanism or a solenoid mechanism is determined by the system of the host equipment to which the FDD is installed. Note that when a damper mechanism is used numerically, the head is loaded onto the disk with the cassette attached, and the disk is rotated only during read/write operations. Furthermore, when a solenoid mechanism is used, the disk is constantly rotated when the power is turned on, and the head is loaded onto the disk by energizing the solenoid only during read/write operations.

The solenoid mechanism 180 includes a solenoid 181, a plunger 182 that is attracted by the excitation of the solenoid, and
It consists of a head load arm 183, and the solenoid is screwed to the base 100 via a plate 184. For mounting the solenoid, there is a U-shaped support part 1 on the plate 184.
84a is provided to protrude, and this support portion 184
A support shaft 184b is supported on the support shaft 184b. A helad load arm 183 is rotatably supported on the support shaft 184b, and a coil spring 184c is further wound around the support shaft 184b. coil spring 1
One end of the head load arm 84c is locked to the U-shaped support portion 184a, and the other end is locked to the head load arm 183, thereby giving the head load arm 183 the habit of rotating clockwise in the figure. There is.

The side of the plunger 182 opposite to the main body of the solenoid 181 protrudes toward the head assembly through a through hole (not shown) formed in the plate 184; By installing E-ring 189,
The amount of protrusion of the plunger 182 from the main body of the solenoid 181 is regulated. Further, a plunger return spring 185 is mounted between the E-ring 189 and the solenoid, and applies a biasing force to the plunger in the direction of the head assembly. In addition, when mounting the solenoid on the E-ring of the plunger 182, noise damping rubber 186 is attached to the plate 184 side and inside the outer end of the plunger, respectively, in order to buffer the impact caused by the vertical movement of the plunger and reduce the noise caused by the impact. has been done.

Further, a first pivot 187a is provided at the tip of the head load arm 183, and when a disk cassette is not inserted into the FDD, this pivot 187a abuts against the upper surface of the cassette guide 152, thereby causing the head load. The arm 183 is a coil spring 184
It is pushed up to the position shown in FIG. 16(A) against the bias of C. At this time, the lifter 2 of the RAD arm 201 is moved to one side of the head carriage by the RAD load arm 183.
04 is supported, and the rad arm 201 on one side is supported in the non-use position shown in the figure.

Furthermore, a second pivot 187b is provided at a portion of the head load arm 183 that comes into contact with the plunger 182. When a disk cassette is inserted into the FDD, the cassette guide is lowered by the aforementioned cassette mounting mechanism,
When the first pivot 187a is released from the upper surface of the cassette guide, the head load arm 183 is rotated clockwise in the figure by the biasing force of the coil spring 184C, and the second pivot 187b is moved outward from the plunger. By abutting the end, the head load arm 183 is held in the position shown in FIG. 16(B). second pivot 1
When 87b comes into contact with the plunger, the first pivot 187a is in a position where it does not come into contact with the cassette guide. Therefore, in this position, the lifter 204 of the helad arm 201 is supported by the head load arm 183, so that the head 205 is supported at a standby position at a predetermined distance from the disk 10.

From this state, when the solenoid 181 is energized and the plunger 182 is attracted in the direction of the arrow in FIG. 16(C),
The head load arm 183 is further rotated clockwise in the figure by the biasing force of the coil spring 184C, and as shown in FIG.
It occupies the position shown in C). In this position, the herad load arm 183 is separated from the bed arm 201, and the one-sided head 205 provided on the head arm 201 comes into contact with the disk 10.

Next, the circuit board will be explained. As shown in FIG. 2, a PCB 400, which is the main control circuit board, is mounted on the cassette guide 152, covering the various components described above. Furthermore, as already explained at the beginning using FIGS. 3 and 4, the top surface of the base 100 has a PC for the DD motor.
B300 is placed. In other words, in conventional FDDs, the main PCB, which was often placed on the bottom surface of the base alongside the DD motor PCB, is placed on the base 100 with various components sandwiched between them. It is placed directly facing the PCB 300.

As shown in FIG. 2, one side wall 100a of the base 100
There is a support notch t! that supports the main PCB 400. 10
0a' is formed in two places, and the same <PCB
One notch 100a' supporting 400 is formed,
Furthermore, a support part 100 for screwing the PCB 400
a'' is formed by, for example, being cut and raised.
Engagement protrusions 400a are formed at positions corresponding to the notches 100a' in the side wall of the base of the CB400. A through hole for screwing, for example, is formed at a position corresponding to the support portion 100a. With such a configuration, when the PCB 400 is assembled into an FDD, the engagement protrusion 400a of the PCB 400 is fitted into the notch 100a' of the base side wall, and the PCB 400 is connected to the support part 100a'' of the base side wall through the through hole. Then screw it in place using the screw 405. Only one place needs to be screwed in.

Then, as shown in FIGS. 1A and 1B, a shield cover 500 for noise shielding is attached to cover the entire structure. This shield cover has a rectangular plate shape, and has protruding edges 502 formed on both sides that are connected to the side walls 100 of the base 100.
side wall 1 to the hole 502a of the protruding side 502.
The front panel 120 is attached to the base 100 by engaging the convex portion 100p formed on the front panel 00a and engaging the front panel 120 with an engaging portion (not shown). At this time, each of the protrusions 400a of the PCB 400 is held down by a claw-shaped PCB holding part 501 formed in the shield cover 500 at a position corresponding to the notch @100a. In this way, the main control board PCB 400 is engaged within the side wall of the base 100, and the shield cover 50
0 holds the PCB 400 on the base. Furthermore, by attaching the shield cover and the base in this manner, the shield cover can function as a reinforcing member that prevents distortion of the base.

Furthermore, as already explained, in this embodiment, DD
PCB300 for the motor and PCB that is the main control circuit board
400 are placed directly opposite the base 100 on the same side. Furthermore, at least one pair of a light emitting element and a light receiving element constituting a transmission type optical sensor is arranged on both circuit boards so as to directly face each other. That is, for example, as shown in FIG. 3(B), the circuit board 300 for the DI motor includes a light-emitting element or a light-receiving element 401 that constitutes a sensor for detecting a cassette, and a light-emitting element or a light-receiving element 401 that constitutes a sensor for detecting write protection. Light receiving element 40
2 is provided. As shown in FIG. 2(A), the main control circuit board 400 includes a sensor element 401 for detecting the cassette and a sensor element 402 for write protection.
A light-receiving or light-emitting element 401' of the cassette detection sensor and a light-receiving or light-emitting element 402' of the write protection detection sensor are attached at positions facing directly.

Furthermore, as shown in FIGS. 2, 3, and 17,
A connector section 140 is attached to the end of the FDD device opposite to the front panel 120. Connector part 1
Reference numeral 40 includes an I10 connector 141 for interfacing with a host device and connected to the main control circuit, and a power connector 142 for power supply. In this embodiment, both connectors 141 and 142 are separated from the main control circuit board 400 and are arranged in two layers in the thickness direction of the FDD, and in this case, the I10 connector 141 attached to the PCB 141a is Although the power connector 142, which is arranged in the lower stage and attached to the PCB 142a, is arranged in the upper stage, the vertical arrangement may be reversed. The PCBs 141a and 142a are connected via a flexible printed circuit board (cable) 143a, and the PCB 142a and the main control circuit board 400 are also connected via a flexible printed circuit board 143b. In addition, I
Although the 10 connector 141 has a large number of ground terminals, the ground terminals are connected together into one common lead wire pattern and pulled out, so the number of cables on the flexible printed circuit board 143b is reduced. , space saving is also achieved here.

When a disk device (FDD) with the above configuration is attached to an electronic device such as a computer or a word processor, the bottom mounting holes formed at three locations on the back of the base of the FDD are attached as shown in Figure 1 (C). For example, it is screwed to an electronic device via 101. By fixing at only 3 of the 4 locations that form the rectangle and using the remaining 1 location as a cutout, the FDD can be attached to electronic equipment using 3 locations.
Fixed with point support. Therefore, even if there is a dimensional error or height difference in the FDD fixing part on the electronic equipment side, the base 100
Since stress that would distort the base 100 is not applied to the base 100, distortion of the base 100 can be prevented.

Next, the operation of the FDD of this embodiment configured as above will be explained.

Turn on the power of the electronic device having the FDD installed as described above, and then insert the disk cassette 1 through the cassette insertion/ejection port 121 of the front panel 120 of the FDD.
50 into the cassette guide 152 of the FDD.

At this time, the cassette 150 is braked via the shutter 122 biased by the coil spring 125 and the brake spring 123, but this does not pose a problem since the manual pushing force is strong when inserting the cassette 150.

When the cassette 150 is inserted into the FDD, the cassette detection sensor elements 401 and 401' arranged on the motor drive control board 300 and the main signal control board 400 and/or the write protect sensor element 402 of the cassette 150 402' is activated and manually sends a signal to the host device indicating the insertion of the cassette 150 and/or whether the cassette is write-protected.

When the cassette 150 is inserted in the direction A in FIG. 7, the notch 150a provided on the front edge of the cassette 150 comes into contact with the cassette shutter opening and pushing arm 180d of the arm portion 160c of the ejector 160, and the cassette The shutter opening and pushing arm 160d is pushed upward in the figure against the bias of the ejector spring 164 and rotated counterclockwise. At this time, the cassette shutter opens and the push-out arm 160d pushes the cassette shutter 150b to the left in the figure, so that the cassette shutter is opened at the same time as the cassette is inserted.
The disc will be exposed. In addition, the cassette 150 is shown in FIG.
When the position shown in B) is reached, and the cassette shutter opening and pushing arm 160d of the ejector 160 reaches a position parallel to the front end of the cassette, the arcuate base 160b of the ejector 160 is pulled out from the latch portion 162C of the slide plate 162. put out. Then, the slide plate 16
2 and the ejector 160 are disengaged, and the slide plate 162 slides in the direction B in the figure by the tension of the tension coil spring 162b.

The cassette guide 152 that accommodates the cassette 150 has dowels 152a formed in a protruding manner on both sides of the guide groove 1 of the guide plate 162d on both sides of the slide plate 162.
62e, the slide plate 162
When the cassette guide is pulled in direction B in the figure, the rollers 152b provided at the center on both sides of the cassette guide are attached to both sides 100a of the base ioo.

Since the cassette guide 152 is engaged with the guide groove 100c formed in the guide groove 100a, the cassette guide 152 is shown as A in the figure.

It cannot move in direction B. Furthermore, slide plate 1
The guide groove 162e of the 62 guide plate 162d is shown in FIG. 8(A).
, (B), and as already explained, it is formed as a long groove inclined downward, so that when the slide plate 162 is pulled by the elasticity of the tension coil spring 162b, it is guided by this guide groove 162e and forced. is moved downward and fixed at the cassette mounting position.

First, a case will be described in which the FDD is provided with a damper mechanism as a buffer mechanism for the head assembly.

As already explained, the damper 171 is provided with the damper arm 172.
is given the ability to constantly rotate downward by a coil spring 175 wound around the support shaft 174, but the first pivot 1 provided downward at the tip of the damper arm 172
76 is supported on the upper surface of the cassette guide 152, thereby restricting the limit of downward movement when the cassette is not loaded. The slide plate 162 moves when a cassette is loaded, and the cassette guide 15 moves accordingly.
2 moves toward the base 100, the cassette guide 1
The damper arm 172 supported on the upper surface of the damper arm 172 is pushed downward by the bias of the coil spring 175. However, the damper is filled with oil, and the damper arm 172 slowly descends due to the oil resistance. Then, the lifter 204 is attached to the damper arm 172.
The head arm 201 of the head assembly 200, which was supported by the damper arm 172, slowly descends, the single-sided head 205 makes a soft landing onto the disk 10, and the zero-sided head 206 and the first-sided head 205
The disk 10 is held between the two.

In this state, the disk 10 is rotated during read/write.

As already mentioned, the damper is provided with a second pivot 177, and when the damper arm 172 descends, the second pivot 177 comes into contact with the upper surface of the base 100, causing the damper arm 172 to move downward. Eight shifts will be regulated.

In this state, as shown in FIG. 13(B), the head arm 2
A predetermined gap is formed between the lifter 204 of 01 and the damper arm 172.

Next, a case will be described in which a solenoid mechanism is provided as a buffer mechanism for the head assembly.

By inserting the cassette 150, the slide plate 162
When the latch portion 162C disengages from the ejector 160, the slide plate 162 pulls the coil spring 1
It is pulled toward the front panel by the elasticity of 62b. As a result, the guide plate 162 of the slide plate 162
d, the cassette guide 152 guided via the dowel 152a moves downward. As a result, the solenoid 1 whose downward movement was restricted by the pivot 187a riding on the upper surface of this cassette guide 152
81 Herad load arm 183 is a coil spring 184C
It rotates clockwise in FIG. 16(A) due to the urging force of . Then, the second pivot 187b of the solenoid 181 comes into contact with the outer end of the plunger, thereby restricting the rotation of the head load arm 183, and the head load arm 183 is held at the standby position shown in FIG. 16(B). Ru.

In this position, the first pivot 187a occupies a position a predetermined distance from the upper surface of the cassette guide 152, and at the same time, the lifter 20 is attached to the head load arm 183.
One side head 205 of head arm 201 supported by 4
is on standby at a predetermined pressure mi from the disk 10. When using a solenoid, the disk is usually rotated immediately after the power of the host device to which the FDD is installed is turned on.

Next, the solenoid 181 is energized, and as shown in FIG.
), the plunger 182 is attracted against the bias of the plunger return spring 185, and the coil spring 184C
The head load arm 183 further rotates clockwise due to the urging force. Then, head load arm 183
The head arm 201, which was supported by
A one-sided head 205 contacts the disk 10. In this state, desired reading and writing of information is performed.

When the power to the solenoid 181 is cut off, the plunger 182 returns to the first position due to the bias of the plunger return spring 185.
6, the one-sided head 205 is returned to the standby position shown in FIG. 6(B) and separated from the disk 10.

Note that, as already described, the head assembly 200 is slidably guided by the guide bar 133 that is supported on the base 100 via the sliding bearing 134 that is attached to a part of the head carriage 201a. Since the provided needle pin 202 is engaged with the screw groove 131a of the screw shaft 131 of the stepping motor 130, it is moved by the driving of the stepping part 130.

Magnetic head 20 due to movement of head assembly 200
The position control of 5.206 is performed in a known manner and will not be described here.

After information has been read and written to the disk as described above, when ejecting the disk, when the eject button 161 provided on the front of the FDD is pushed in, the slide plate 162 moves against the bias of the tension coil spring 162b. Slide in direction A from the position shown in Figure 7 (,B). As a result, the eject button 161 of the slide plate 162
The latch portion 162C formed at the opposite end is separated from the rear portion of the arcuate base portion 160b of the ejector 160, and the arm portion 160C of the ejector 160 is rotated counterclockwise by the bias of the ejector spring 164. moved,
Move to the ejection position shown in FIG. 7(A). At this time, the cassette 150 is pushed out toward the front panel 120 by pushing out the cassette and rotating the shutter release arm 160d counterclockwise, which is provided at the tip of the arm portion 160c of the ejector 160 and keeping the shutter 150b of the cassette 150 in the open position. It will be done. At this time, as the arm portion 160c of the ejector 160 pushes out the cassette and the shutter release arm 160d rotates, the shutter 15 of the cassette 150 gradually escapes from the restriction of the arm 160d.
0b is moved in the closing direction by a spring mechanism (not shown), so the cassette 150 is ejected from the FDD with the shutter 150b closed.

At this time, the movement of the cassette 150 is reliably braked with a strong braking force via the shutter 122 biased by the brake spring 123 and the coil spring 125 inside the front panel 120 of the FDD, so that the cassette pops out and falls off. It will not cause any damage. When the bookmark set 150 is installed, only the coil spring 125 acts on the shutter 122, and no large load is applied to the cassette 150.

[Effects of the Invention] As is clear from the above description, according to the present invention, in a disk device that records or reproduces information by rotating a disk as a recording medium by driving a motor, a drive control circuit board for the motor is provided. Since an opening is formed in the area facing the rotor of the motor and the coil of the motor is provided within this opening, the height of the motor is reduced by a dimension corresponding to the thickness of the drive control circuit board of the motor. An excellent effect can be obtained in that the thickness can be lowered and the disk device can be made thinner accordingly.

[Brief explanation of the drawing]

FIG. 1 and subsequent figures explain the structure of an FDD according to an embodiment of the present invention, and FIGS. 1(A) and 1(B). (C) and (D) are a plan view, side view, bottom view, and front view showing the overall appearance of the FDD, respectively, and Figure 2 (A) is the FDD shown in Figure 1 with the shield cover removed. Plan view, Fig. 2 (B) is a front view of the same state, Fig. 3 (A) is a plan view with the FDD shield cover and main control circuit board removed, Fig. 3 (B) is the DD motor FIG. 3(C) is a side view, FIG. 3(D) is a front view, FIG. 4(A) is a side sectional view showing the assembled state of the DD motor, and FIG. B) is a perspective view of the main parts showing the arrangement of the coil and Hall element of the DD motor, and Figure 4 (C) is the DD motor.
The plan view of the motor, Fig. 4 (D) is the plan view of the DD motor (Fig. 4 (D)).
C) cross-sectional view taken along the mV-TV line, Figures 5 (A) and (B
) is an explanatory diagram showing the action of the brake spring and coil spring, Fig. 6 is a plan view showing the assembled state of the slide plate and ejector, and Figs. 7 (A), (B), and (C) show the operation of the ejector. Explanatory diagram, FIG. 8(A). (B) is an explanatory diagram showing the operation of the cassette guide, FIG. 9 is an explanatory diagram showing the state in which the stepping motor is installed,
Figure 0 is an explanatory diagram showing the assembled state of the head assembly, Figure 11 is a configuration diagram of the head assembly, Figures 12-
FIG. 14 is for explaining the damper mechanism, FIG. 12 is an explanatory diagram showing the state in which the damper mechanism is attached, and FIG. 13 (A). (B) and (C) are explanatory diagrams showing the installation state of the damper mechanism, Figures 14 (A) and (B) are explanatory diagrams showing the operation of the damper, and Figures 15 and 16 are illustrations of the solenoid mechanism. Figure 15 is a configuration diagram of the solenoid mechanism and Figure 16 is a diagram for explaining the solenoid mechanism.
Figures (A), (B). (C) is an explanatory diagram showing the operation of the solenoid, and Fig. 17 (A
) to (C) are explanatory diagrams showing the arrangement of connectors. 100...Base 100a...Side 100a
... Notch 100a ... Support part 100b.
...Rear wall 101...Bottom mounting is part 102...
- Notch part 110...DD motor 111...Stator yoke 112...Coil 113...Hall element 11
4...Spindle shaft 115...Rotor yoke 115a...Magnet 120...Front panel 121...Cassette insertion/ejection port 122...Shutter 123...Brake spring 130...Stepping motor 131...・Screw shaft 132... washer 13
3... Guide bar 140... Connector part 141
...I10 connector 141a=PCB 142...Power connector 142a...PCB1
43a, 143b = Flexible PCB 300...Motor PCB 400...Main PCB 401...Sensor element for cassette detection 402...Sensor element for write protection detection 500...Cut the shield cover shield The second part of the cooking process is
Figure (A) FDD/If surface Figure 2 (B) 1704';ノ\-! Figure 12

Claims (1)

[Scope of Claims] 1) In a disk device that records or reproduces information by rotating a disk as a recording medium driven by a motor, an opening is provided in an area facing the rotor of the motor in a drive control circuit board of the motor. 1. A disk device characterized in that a coil of the motor is provided within the opening. 2) The disk device according to claim 1, wherein the drive control circuit of the motor and the coil portion are connected directly through a coil terminal.