JP2002015555A - Disk drive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable loading of a board into a frame in proper state at all times, without being affected by the machining errors and the expansion and shrinkage, etc., of members. SOLUTION: A main control substrate 420, which mounts a motor control circuit which outputs a prescribed signal to a control circuit of a head drive mechanism and the motor drive circuit and a sensor circuit substrate 410, which mounts a sensor which detects the prescribed information of a disk are constituted as separated boards and the respective boards 420, 410 are mounted on the back surface side of bottom plate of the frame 10. In such a manner, by making the main control substrate 420 and the sensor circuit substrate 410 respectively separated substrates, the respective substrates 420, 410 are miniaturized, the lowering of positioning precision due to the machining errors and the expansion and shrinkage of the members is suppressed and the respective substrates 420, 410 can be mounted on the frame 10, in a proper state with few distortions. Moreover, it is not necessary that the respective substrates 420, 410 be mounted on the same plane but that the substrates can be mounted with different heights on the frame 10, and therefore the flexibility of the mounting of parts on the frame 10 is widened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive for recording and reproducing data on a recording medium such as a floppy disk.

[0002]

2. Description of the Related Art In general, a disk drive of this kind drives a drive motor for rotating an inserted disk, a magnetic head unit for recording and reproducing data on and from the disk, and drives the magnetic head unit. A head drive mechanism is provided, and a control circuit for controlling these drives and a sensor circuit for detecting various kinds of information (for example, information on write protection and disc type) from the inserted disc are built in. .
Of these, the control circuit and the sensor circuit are mounted on a resin substrate, and are mounted on the lower surface of the frame that forms the frame of the disk drive. Conventionally, the substrate on which these circuits are mounted is a single resin substrate. Had been formed.

[0003]

When the substrate (circuit board) on which each circuit is mounted is formed of a single resin substrate, it is inevitable that the circuit board becomes large. Such a large circuit board has the merit that the mounting work can be completed in one process because it is composed of one sheet, but it is susceptible to processing errors and expansion and contraction of the frame and circuit board on which it is mounted, and the frame In some cases, a slight displacement occurs between the board mounting portion (screw hole) formed on the circuit board and the mounted portion (screw insertion hole) formed on the circuit board.
When such a displacement occurs, internal stress due to distortion is generated in the circuit board mounted on the frame, and there is a possibility that the circuit board may be damaged by a small external force, such as a crack.

[0004] In addition, a large, single-piece circuit board must be shaped so as to escape the projection if a projection (eg, a drive motor) is present on the lower surface of the frame on which it is mounted. , Resulting in a complicated planar shape. For example, a conventional floppy disk drive device obtained by the present applicant has a planar circuit board 500 as shown in FIG.
However, in the circuit board 500, a large-area concave portion 501 was present on the circuit board in order to avoid a place where the drive motor is mounted. When the circuit board 500 having such a shape is cut out from a rectangular base material, the base material remaining in the concave portion 501 becomes scrap, and waste of material is large. In general, since a resin base material for cutting a circuit board is provided by being processed into a rectangular shape in advance, the larger the shape of the circuit board cut out therefrom, the more the base material portion serving as a scrap becomes. Become.

The present invention has been made in view of such circumstances, and it is an object of the present invention to always allow a substrate to be mounted on a frame in an appropriate state without being affected by processing errors of members, expansion and contraction, and the like. This is the purpose of 1. Further, a second object of the present invention is to reduce material cost by reducing waste of a base material for cutting a substrate.

[0006]

In order to achieve the first object, a first aspect of the present invention is a frame having a bottom plate and forming a frame of the apparatus, and a magnetic head for recording and reproducing data on and from a disk. Unit, a head drive mechanism for driving the magnetic head unit, a drive motor for rotating the disk at a high speed, a disk drive motor unit including a motor drive circuit for driving the drive motor, and at least a control circuit and a motor drive for the head drive mechanism A main control board on which a motor control circuit for outputting a predetermined signal to a circuit is mounted, and a sensor circuit board on which a sensor for detecting required information of the disk is mounted, and the main control board and the sensor circuit are provided on the back side of the bottom plate of the frame. A disk drive device having a board mounted thereon, wherein a main control board and a sensor circuit board are provided separately. And said that the content was.

As described above, since the main control board and the sensor circuit board are formed as separate boards, each board is reduced in size, and it is possible to suppress a processing error and a decrease in positioning accuracy due to expansion and contraction of members, and to reduce distortion. In this state, each substrate can be mounted on the frame. In addition, these boards need not be mounted on the same plane, and can be mounted on the frame at different heights, so that the degree of freedom in designing components on the frame is increased.

In order to achieve the second object,
The invention according to claim 2 is characterized in that the main control board and the sensor circuit board are formed to have substantially the same width, and each has a shape with little irregularities and a shape close to a rectangle. As described above, the base material from which the substrate is cut is provided by being processed into a rectangular shape in advance. Therefore, by cutting the main control board and the sensor circuit board having the above configuration from the base material adjacent to each other at the same width in the front and rear direction, the base material portion to be scrap can be reduced as much as possible, and the material cost can be reduced. It becomes possible.

Here, for example, the main control board can be mounted on the back rear side of the frame bottom plate, while the sensor circuit board can be mounted on the front back side of the frame bottom plate. The main control board and the sensor circuit board can be electrically connected by a lead wire.

Further, in a disk drive device using a floppy disk as a recording medium, the sensor circuit board is written on the floppy disk at least in opposition to a write protect detector provided at the rear of one side edge of the floppy disk. A write protection detection switch for detecting whether or not the disk is in a prohibited state; a disk type identification switch for identifying the type of the disk in opposition to a disk type detection unit provided at the rear of the other side edge of the floppy disk; It is preferable to adopt a configuration in which is mounted.

According to the standard of the floppy disk drive, these switches are mounted near the front end of the frame. Therefore, even if these switches are mounted on a single board, the shape of the board is complicated. This is advantageous in that the number of assembling steps is reduced and workability is improved as compared with mounting on an individual substrate.

Further, if the sensor circuit board is configured such that only one arbitrary portion is fastened to the frame, even if there is a mounting error or the like, the circuit board is allowed to be deformed to some extent so that internal stress is hardly generated. (Claim 5). In this case, it is preferable that a substrate supporting portion for supporting the sensor circuit board in a bendable state is formed at a front portion of the bottom plate of the frame, and both ends of the sensor circuit board are protected by the substrate supporting portion. ).

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings. In the present embodiment, a configuration is shown in which the present invention is applied to a disk drive device (FDD) using a floppy disk as a recording medium.

As shown in FIG. 26, the floppy disk 1 is composed of a case body 2, a magnetic disk 3 and a shutter 4. A disk-shaped magnetic disk 3 is rotatably housed inside the case 2. I have. An exposure window is formed in the front part of the upper surface of the case body 2, and a shutter 4 is mounted on the front part of the case body 2 so as to open and close the exposure window. That is, the shutter 4 has the notch 4a
17 and is slidable in the lateral direction, and by sliding to the left in FIG.
a is disposed at a position corresponding to the exposure window 2a of the case main body 2 to expose the magnetic disk board 3 (see FIG. 26B). The shutter 4 is urged rightward in FIG. 26 by a spring member (not shown), and slides rightward with the urging force to close the exposure window 2a.

Further, positioning holes 5 are formed at predetermined front positions on the rear surfaces of both sides of the case main body 2, and engage with positioning projections 17a (see FIG. 16) described later to be positioned and fixed in the apparatus. You. A write protect detector 6 is formed at the rear of one side edge of the case body 2. The detection section 6 is provided with a slide piece 7, and by moving the slide piece 7 back and forth, either write inhibition or writable can be set. A rear portion of the other side edge of the case body 2 serves as a disk type detection unit 8 for identifying the type (2HD or 2DD) of the floppy disk 1. By the way, the 2HD type floppy disk 1 is provided with a detection hole in the detection section, while the 2DD type floppy disk 1 is not provided with the detection hole. Further, a front end corner of the case body 2 is cut off in a tapered shape to form an erroneous insertion preventing portion 9. The configuration of the floppy disk 1 described above is all standardized.

FIG. 1 is a perspective view showing the appearance of a disk drive according to the present embodiment, and FIG. 2 is an exploded perspective view of the disk drive. In the present embodiment,
As shown in FIG. 1, the front and rear directions are defined as indicated by arrows in the drawing, with the side on which the front panel 50 is mounted as a front part.

The disk drive device according to the present embodiment includes a frame 10 forming a frame, a lower cover 30 covering a lower portion of the frame 10, an upper cover 40 covering an upper portion of the frame 10, and a front end opening of the frame 10. 1 forms a housing structure as shown in FIG. Further, a member called a slider 60 shown in FIG. 2 is mounted on the frame 10 so as to be movable in the front-rear direction, and in a state combined with the slider 60, a member called a carrier 70 is movable in the vertical direction. Be attached. These slider 60 and carrier 70
Is a disk insertion slot 51 formed in the front panel 50.
It has a function of loading the floppy disk 1 inserted from the disk into an appropriate position and discharging the floppy disk 1 from the disk insertion slot 51. The frame 10 includes a magnetic head unit 100, a head drive mechanism 200, a disk drive motor unit 300, a sensor circuit board 410,
Various components required for magnetic recording and reproduction, such as the main control board 420, are incorporated.

FIG. 3 is a perspective view showing a state where various components other than a slider, a carrier, and an upper cover are incorporated in the frame, and FIG. 4 is a view showing the frame. As shown in FIG. 4, the frame 10 is a metal plate having a shape in which the side plates 10b are erected from both side edges of the bottom plate 10a and the back plate 10c is erected from the rear edge of the bottom plate 10a. As shown in FIG. 3, the magnetic head unit 100 and the head driving mechanism 2
00 is attached.

The head driving mechanism 200 includes a stepping motor 201, a screw 202, a guide rod 203
(See FIG. 2). The stepping motor 201 is fixed to a back plate 10 c of the frame 10, and a rotation drive shaft of the motor 201 is a screw 202. The screw 202 is a rod-shaped member having a helical thread groove formed on the peripheral surface, and the tip is supported by the bearing 11 formed upright from the bottom plate 10 a of the frame 10. Then, as shown in FIG.
A driven portion 114 extending from one side edge of the magnetic head unit 100 is engaged with 02. Guide rod 203
Although not shown in the drawing, is fixed to the bottom plate 10a of the frame 10 via a fixing plate 204 (see FIG. 2).
The guide rod 203 is connected to the magnetic head unit 100.
Through hole 116a of guided portion 116 extending from the other side edge
(See FIG. 18D). As a result, the magnetic head unit 100
With the rotation of the screw 202 by the guide rod 2
03 and is driven in the front-rear direction.

As shown in FIG. 4, a motor mounting portion 12 is formed in the bottom plate 10a of the frame 10 with an opening, and a disk drive motor unit 300 is screwed to the motor mounting portion 12 from the lower surface side. (See FIG. 3). The disk drive motor unit 300 is, as shown in FIG.
The motor substrate 30 is mounted on the upper surface of the metal motor fixing plate 301.
2 and a disk drive motor 303 are mounted. As the disk drive motor, for example, a versatile motor provided by a motor manufacturer can be used. Here, the disk drive motor 303 is controlled by a drive signal input via the motor substrate 302, and the turntable 304 rotates at a high speed. Turntable 30 of disk drive motor 303
4 is a motor mounting portion 1 of the frame 10 as shown in FIG.
2 is exposed on the upper surface side of the bottom plate 10a from the opening formed in the bottom plate 10a.

A sensor circuit board 410 and a main control board 420 shown in FIG. 2 are mounted on the bottom surface of the bottom plate 10a of the frame 10, and the periphery thereof is covered with the lower cover 30 to protect these boards 410 and 420. are doing. FIG. 6 is a view showing the lower cover, and as shown in FIG.
Has a bottom plate 30a, a side plate 30b formed upright from both side edges of the bottom plate 30a, and a back plate 30c formed upright from the rear edge of the bottom plate 30a. The lower cover 30 is, as shown in FIG.
a from below. At this time, the lower cover 3
The zero side plate 30b is fitted to the frame 10 without backlash since its upper region fits into the lower region of the side plate 10b of the frame 10 from outside.

The front ends of the frame 10 and the lower cover 30 are open, and the shutter 52 and the front panel 50 shown in FIG. 2 are fitted into the open front ends. The shutter 52 is rotatably mounted between both side plates 10b of the frame 10 and opens and closes a disk insertion opening 51 formed in the front panel 50 from the back side.
The shutter 52 is constantly urged by the torsion coil spring 53 in a direction to close the disc insertion port 51,
Intrusion of dust from the insertion port 51 is prevented.

FIG. 7 shows a front panel.
(A) is a front view, (b) is a right side view, (c) is a bottom view,
(D) is a perspective view. FIG. 8 shows A-
FIG. 9 is a right side view showing a state in which a front panel is mounted on the front ends of the frame and the lower cover. FIG. 10A is a front view of the frame and the lower cover as viewed from the front end side, and FIG. 10B is a partially enlarged view of FIG.

FIG. 7A shows the front panel 50.
As shown in (d), a disc insertion slot 51 is provided at the front and a slot 5 for exposing an eject button 67 described later to the front.
4 and a sensor circuit board 410 described later (for example, FIG.
L) that transmits the light of the LED 414 provided in the
An ED display window 55 is formed.

The disk insertion port 51 extends in the lateral direction, and it is desired that the opening dimension be as large as possible so that the floppy disk 1 to be inserted can be easily inserted. Further, two locking pieces 56 are formed on the rear side edges of the front panel 50 so as to extend upward and downward, respectively, and the tip of the locking piece 56 has a hook-like shape protruding outward. It is a locking claw 56a.

On the other hand, on the side plate 10b of the frame 10, the engaging portion 14 is formed at a portion where the locking piece 56 is fitted. As shown in FIG. 10B, the engaging portion 14 is formed by extruding the inner surface of the side plate 10b to the outside, so that the inner surface 14a of the engaging portion 14 is disposed outside the inner surface around the engaging portion. Have been. Further, the engaging portion 13 is formed with an engaging hole 13 for locking the locking claw 56a.

The upper locking piece 56 formed on the front panel 50 is fitted along the inner surface of the engaging portion 14 extruded to the outside, and the locking claw 5
6a is engaged with the engagement hole 13. Thus, frame 1
The engagement portion 1 in which the locking piece 56 is fitted on the side plate 10b
The width between the locking pieces 56 of the front panel 50 can be increased by expanding the inner surface 14a of the front panel 4 outward. Since these locking pieces 56 are formed on both sides of the disc insertion slot 51 as shown in FIG. 8, if the width between the locking pieces 56 is increased, the lateral width of the disc insertion slot 51 can also be increased. As a result, the opening size of the disk insertion opening 51 is widened, and the floppy disk 1 to be inserted can be easily inserted. The upper locking piece 56 formed on the front panel 50 is locked in the engagement hole 31 formed in the side plate 30b of the lower cover 30 (see FIG. 9).

Further, when the width of the disk insertion slot 51 is increased, the floppy disk may be inserted into the disk insertion slot 51 while being left and right inclined. Therefore, in the present embodiment, as shown in FIG. 8, each locking piece 56 is formed on both sides of the disk insertion slot 51, and when the floppy disk 1 is inserted in a posture inclined to the left and right, the disk 1 is engaged. The stopper 56 is configured to come into contact with the inner surface of the stopper 56 and to be guided in an appropriate insertion direction. That is, the locking pieces 56
Has a function of guiding the floppy disk 1 inserted into the disk insertion slot 51.

As shown in FIGS. 4 and 10 (a),
The front end of the bottom plate 10a of the frame 10 is slightly bent upward, and two positioning holes 15 are formed in the bent portion 10d. On the back surface of the front panel 50, two positioning projections 57 are formed. These positioning projections 57 are fitted into positioning holes 15 formed in the frame 10 to prevent the frame 10 from rattling. When an excessive external force acts on the front panel 50, the positioning projection 57 receives the external force and protects the locking piece 56.

FIG. 11 is a view showing a slider, and FIG. 12 is a view showing a carrier. FIG. 13 is an exploded perspective view showing a state before the slider and the carrier are mounted in the frame, FIG. 14 is a perspective view showing a state in which the slider is mounted in the frame, and FIG. FIG. 4 is a perspective view showing a state where the camera is mounted on the camera.

As shown in FIG. 11, the slider 60 has a bottom plate 60b extending rearward from both sides of the front plate 60a and is formed in a flat U-shape. From the outer edge of each bottom plate 60b,
Side plates 60c are formed by bending upward, and each side plate 60c is formed with an inclined guide groove 61 for elevating and lowering extending obliquely downward and rearward from the upper end edge. In addition, near the front and rear ends of the upper edge of the side plate 60c, the slider 60
An engagement piece 62 for restricting the vertical movement of the arm is formed to extend to the side. Further, the bottom plate 60b of the slider 60
Has an opening 63 formed in a part thereof, and an engagement piece 64 is bent downward from an edge of the opening 63 (see FIG. 11D).

The opening 63 is provided in the frame 1 as described later.
It is a relief hole for avoiding interference with the support piece 17 formed by cutting out from the bottom plate 10a of the “0” and is formed corresponding to the support piece 17. In the present embodiment, the structure of the slider 60 is simplified by forming the engagement piece 64 using a portion cut out from the slider 60 when forming the opening 63. The engagement piece 64 serves as a guide when the slider 60 moves in the front-rear direction, as described later.

Further, at the rear end of one of the side plates 60c, an engagement projection 65 which engages with a cam surface 83a of an opening / closing lever 80, which will be described later, is bent downward. A pressing projection 66 is formed at the front end of the slider 60, and an eject button 67 is attached to the projection 66.

On the other hand, a support groove 16 extending in the front-rear direction is formed in the side plate 10b of the frame 10, as shown in FIG. The slider 60 having the above-described configuration is mounted on the frame 10 movably in the front-rear direction with the engagement pieces 62 engaged with the support grooves 16. The engagement of the engagement piece 62 with the support groove 16 prevents the slider from falling off the frame. A coil spring 68 is stretched between the slider 60 and the frame 10, and the slider 60 is constantly urged forward by the spring force of the coil spring 68.

A support plate 1 for supporting the floppy disk 1 from below is provided on the bottom plate 10a of the frame 10.
7 are formed at predetermined locations. These support pieces 17
As shown in an enlarged manner in FIG.
Is bent upward to form an L-shaped cross section, and a positioning projection 17a (positioning portion) for positioning the floppy disk 1 is formed on the upper surface thereof. When the support piece 17 is formed by cutting and bending the bottom plate 10a of the frame 10 upward as described above, the notch hole 18 is formed in the bottom plate 10a of the frame 10.

In this embodiment, at least one side edge 18a of the notch hole 18 is formed so as to extend linearly in the front-rear direction, and as shown in FIG.
0 is formed on the side edge 18a of the cutout hole 18.
By engaging with, the slider 60 functions as a guide when the slider 60 moves in the front-rear direction. Thus, the notch hole 1 formed in association with the support piece 17 is provided.
Since the side edge 18a of the slider 8 is used as a guide for the slider 60 to move in the front-rear direction, it is not necessary to separately form this kind of guide, and as a result, the structure of the frame 10 is simplified. Processing becomes easy.

Referring again to FIG. 4, the front plate 60 of the frame 10
The locking portions 21 and 22 for locking one end of the coil spring 68 are cut out and formed near the boundary between the bottom plate 10a and the bottom plate 10a. Are formed with notch holes 23 and 24, respectively. In the present embodiment, the side edges of the notches 23 and 24 are also used as auxiliary guides for the slider 60 to move in the front-rear direction. That is, as shown in FIG.
9a and 69b are bent downward, and these engaging pieces 69a and 69b are respectively formed in the corresponding notch holes 23,
24, and functions as an auxiliary guide portion when the slider 60 moves in the front-rear direction.

Here, the area where the engagement piece 69b in one of the notch holes 24 is engaged is formed in a slit-like long groove 24a extending in the front-rear direction. Further, the long groove 24a
As shown in the enlarged view of FIG. 11 (e), a bulging portion 69c is formed on the peripheral wall of the engaging piece 69b which engages with the long groove 24a by half-blanking. The gap between the piece 69b and the piece 69b is reduced. As described above, by reducing the gap between the long groove 24a and the engagement piece 69b, a configuration is realized in which the slider 60 is engaged with the frame 10 without rattling.

As shown in FIG. 12, the carrier 70 has a side plate 7a extending downward from both side edges of the top plate 70a.
0b is formed. Lower edge 70c of these both side plates 70b
Is bent inward, and has a function of cooperatively holding the side edge of the floppy disk 1 inserted from the front to the lower side of the top plate 70a. On each side plate 70b of the carrier 70, an engagement projection 71 for up and down movement and an engagement projection 72 for oblique relative movement are formed to protrude sideways, respectively. Further, a cutout 73 for avoiding interference with the magnetic head unit 100 is formed in the top plate 70a of the carrier 70 as shown in FIG.

On the other hand, as shown in FIG. 15, a vertical guide groove 19 extending in the vertical direction is formed in the side plate 10b of the frame 10. The carrier 70 engages the engagement protrusion 71 for vertical movement with the vertical guide groove 19 and the engagement protrusion 72 for oblique relative movement to the slider 60.
In the state of being engaged with the inclined guide groove 61 of FIG.
It is mounted inside the frame 10.

As described above, the slider 60 and the carrier 70 mounted inside the frame 10 are relatively movable in an oblique vertical direction along the inclined guide groove 61 between them. However, the engagement piece 62 of the slider 60 engages with the support groove 16 of the frame 10 and the carrier 70
Is engaged with the vertical guide groove 19 of the frame 10, the relative movement in the oblique vertical direction is decomposed into the forward and backward movement of the slider 60 and the vertical movement of the carrier 70.

The carrier 70 is provided with a torsion coil spring 74 shown in FIG.
4 enters into the insertion track of the floppy disk 1 from a notch hole 75 (see FIG. 12) formed in the carrier 70. When the floppy disk 1 is inserted in a proper posture, the erroneous insertion preventing portion 9 (see FIG. 26) of the floppy disk 1 pushes out the tip of the torsion coil spring 74 to enable insertion. ,
For example, if the user attempts to insert the floppy disk 1 in an upside-down orientation, it is blocked by the tip of the torsion coil spring 74, thereby preventing erroneous insertion.

FIG. 17 is a plan view showing an opening / closing lever for opening and closing the shutter of the floppy disk. The opening / closing lever 80 is rotatably supported by the bottom plate 10 a of the frame 10 and is rotated by a torsion coil spring 81.
It is always biased in the illustrated counterclockwise direction. Open / close lever 80
, A cam portion 83 having an arc-shaped cam surface 83 a centered on a rotation shaft 82 and a pressing portion 84 for sliding the shutter 4 are integrally formed. Cam surface 83a
The engagement protrusion 65 formed on the slider 60 is disengaged.
That is, when the floppy disk 1 is inserted,
As shown in FIG. 17A, the pressing portion 84 of the opening / closing lever 80
Engages with one end of the shutter 4. At this time, the engagement protrusion 65 formed on the slider 60 is engaged with the cam surface 83a, and is prevented from moving forward.

From this state, the floppy disk 1
Is pushed forward, the opening / closing lever 80 is pushed by the front end of the case body 2 and rotates clockwise in the drawing.
The pressing portion 84 of the opening / closing lever 80 pushes and opens the shutter 4 to the left in the figure to expose the magnetic disk 3 from the exposure window 2a as shown in FIG. Here, the engagement protrusion 65 formed on the slider 60 is disengaged from the cam surface 83a, and as a result, the coil spring 68 (see FIG. 14).
The slider 60 moves forward with the urging force of. With the movement of the slider 60, the carrier 70 moves downward, and the loading of the floppy disk 1 is completed.

FIG. 18 is a view showing a magnetic head unit. The magnetic head unit 100 includes, as shown in FIG.
A lower head support member 111 called a carriage that supports the lower magnetic head 110 and an upper head support member 121 that supports the upper magnetic head 120 are provided. The lower head support member 111 has a lower magnetic head 110 mounted on a front end thereof via a joining plate 112, and a pedestal 113 for fixing the upper head support member 121 on a rear end.
Are formed. As described above, the driven portion 114 extends from one side edge of the lower head support member 111, and the driven portion 114 engages with the screw 202 of the head driving mechanism 200 (see FIG. 3). On the other side edge of the lower head support member 111, as shown in FIG. 18 (d), a guided portion 116 having a through hole 116a is formed. The guide rod 203 is inserted as described above.

FIG. 19 is a bottom view of the upper head support member, and FIGS. 20 and 21 are side views of the upper head support member.
As shown in FIG. 19, the upper head support member 121 has a top end to which an upper magnetic head 120 is mounted via a support spring 122 called a gimbal spring. That is, the upper magnetic head 120 is fixed to the center of the support spring 122, and the peripheral edge of the support spring 122 is fixed to the lower surface of the tip of the upper head support member 121 using a UV adhesive (ultraviolet curable adhesive). It is adhered to.

Further, from one side surface of the upper head support member 121, a push-up lever 123 extends to the side, and as shown in FIG.
0 is engaged with the edge of the notch 73 formed in the
It has a function of lifting the tip of the upper head support member 121 (that is, the upper magnetic head 120) with the rise of zero. The auxiliary lever 124 also extends laterally from the other side surface of the upper head support member 121,
The auxiliary lever 124 lightly contacts the carrier 70 in a state where the tip of the upper magnetic head 120 is lifted, and suppresses the vibration of the upper head support member 121.

Further, from both sides of the rear end of the upper head support member 121, first and second legs 125 and 126 respectively extend rearward. These first and second legs 125,
The lower rear surface of the rear end 126 has rotation supporting points 125a and 125a, respectively.
26a, and these rotation fulcrum 125a, 12
6a is arranged to be in contact with the pedestal 113 (FIG. 2).
0, see FIG. 21).

A leaf spring member 130 is fixed to the rear center of the upper head support member 121 by a fastener 131 such as a screw. This leaf spring member 130 is located between the first and second legs 125 and 126. Extending rearward through the part. The leaf spring member 130 is, as shown in FIG.
0a spreads out on both sides to form a T-shape.
A fastening hole 132 is formed in 30a. Leaf spring member 13
The fixing member 133 made of a metal plate is superimposed on the upper surface of the base 130a of
4 is screwed into the pedestal 113 through the fastening hole 132,
As a result, the base 130a of the leaf spring member 130 is
3 (see FIG. 20).

Further, the base 130a of the leaf spring member 130
Has a pair of pressing spring portions 13 formed in an L-shape.
5,136 are formed. These pressing spring portions 13
5 and 136 are functions of pressing the rear ends of the first and second legs 125 and 126 disposed on the upper surface of the pedestal 113 from above to suppress the lifting of the legs 125 and 126 from the pedestal 113. have. That is, even when the upper head support member 121 receives an external force such as vibration, the first and second leg portions 125 and 126 are pressed by the pressing spring portions 135 and 136.
By pressing and supporting the rotation fulcrums 125a and 126a of
Excessive lifting and displacement of the rotation fulcrums 125a and 126a can be prevented. As a result, there is no possibility that the upper magnetic head is displaced during recording / reproducing on the disk, and stable recording / reproducing operation is ensured.

When the push-up lever 123 is lifted as the carrier 70 is lifted, the upper head support member 121 pivots on the lower surfaces of the rear ends of the first and second legs 125 and 126. At this time, only the spring force of the leaf spring member 130 is used.
The pivots 125a and 126a are lifted.

Further, since the push-up lever 123 extends from one side surface of the upper head support member 121, when the push-up lever 123 is lifted, the leaf spring member 1
A torsional torque is generated at 30. When the torsion occurs in the leaf spring member 130 due to the torsion torque, in particular, the lifting lever 1 is separated from the center axis of the upper head support member 121.
The first leg 125 formed on the same side as 23 may be greatly lifted, and as a result, the upper magnetic head 120 may be inclined. When the upper magnetic head 120 is tilted, the inserted floppy disk 1 may interfere with the upper magnetic head 120, and both or one of them may be damaged.

The pressing spring 1
By pressing the pivots 125a, 126a of the first and second legs 125, 126 with 35, 136, the lifting of the pivots 125a, 126a can be suppressed, and the obstacle is prevented. be able to.

Even if the first leg 125 is pressed and supported by the pressing spring 135, the rotation of the first leg 125 is caused by the torsional torque acting on the leaf spring member 130 when the lifting lever 123 is lifted. The fulcrum 125a is the pedestal 1
In the case of slightly rising from the position 13, the rotation fulcrum 126a of the second leg 126 is extended appropriately rearward from the rotation fulcrum 125a of the first leg 125,
It is preferable to correct the inclination of the upper magnetic head 120 due to the lifting.

The above-mentioned fixing member 133 includes the first
The first cover 13 is positioned at a position corresponding to the rear end of the leg 125.
3a, and a second cover 133b is formed at a position corresponding to the rear end of the second leg 126. Each of these cover parts 133a, 133b is provided with a pressing spring part 135,
From the outer circumference of 136, the corresponding legs 125,
The rear end portion 126 is covered, and excessive lifting of the rotation fulcrums 125a and 126a from the pedestal 113 due to a sudden impact is restricted.

Further, as shown in FIG. 18, the pedestal 113 is provided with a torsion coil spring 115, and the torsion coil spring 115 urges the center of the upper surface of the upper head support member 121 downward. With the biasing force of the torsion coil spring 115, the upper head support member 121 is constantly biased in the direction in which the tip is lowered.

FIG. 23 is a view showing various circuit boards built in the disk drive device of this embodiment, FIG. 24A is a bottom view showing a state in which these circuit boards are mounted on the bottom plate of the frame, and FIG. () Is an enlarged front view of part II in (a) as viewed from the arrow X direction, and (c) is an enlarged side view of part II as viewed from the direction of arrow Y. FIG. 25 is a plan view showing a layout of the circuit boards on a base material. In the disk drive of this embodiment, FIG.
As shown in the figure, the sensor circuit board 410 and the main control board 4
20 are mounted on the bottom plate 10 of the frame 10.
a from the back side. Among them, the sensor circuit board 410 is a circuit board on which various sensors are mounted. In this embodiment, a switch (write) for detecting whether or not the inserted floppy disk 1 is write-protected is provided on the sensor circuit board 410. A protection detection switch) 411, a disk type identification switch 412 for identifying the type (2HD or 2DD) of the floppy disk 1, and a disk insertion detection switch 413 for determining whether the floppy disk 1 is properly inserted. Have been.

As shown in FIG. 24, the sensor circuit board 410 is mounted on the front end of the back surface of the bottom plate 10a of the frame 10 along the front edge. That is, the sensor circuit board 4
In 10, only one portion of the circuit board 410 is fastened to the bottom plate 10 a by one fastener (for example, screw) 415. By fastening the sensor circuit board 410 at only one location with one fastener 415 in this manner, there is an effect that the deformation of the circuit board 410 is allowed to some extent and internal stress is hardly generated. In particular, since the sensor circuit board 410 is formed in an elongated shape as shown in FIGS. 23B and 23D, the sensor circuit board 410 is easily damaged by the generation of internal stress.
The mounting structure to the frame is effective.

Further, the bottom plate 10a of the frame 10 is provided at the position where both side edges of the sensor circuit board 410 are arranged as shown in FIG.
As shown in FIGS. 4 (b) and (c), projecting pieces 10e and 10f for supporting the substrate formed by cutting out the bottom plate 10a (substrate supporting portions).
Are formed respectively. Among them, the protruding piece 10e is formed by cutting and raising downward from the bottom plate 10a, while the protruding piece 10f is formed by cutting and bending into an L shape from the bottom plate 10a. Both ends of the sensor circuit board 410 are disposed between the protruding pieces 10e and 10f, respectively, and are supported by being in contact with one of the protruding pieces 10e. L-shaped projection 10
A small gap is formed between f and the sensor circuit board 410, and it is possible to bend in the gap.

In this mounted state, the write protection detection switch 411 is connected to the write protection detection unit 6 (FIG. 26) provided on the floppy disk 1 to be inserted.
) Is mounted on the sensor circuit board 410 so as to be fixed at a position facing the same. The disk type identification switch 412 is also fixed to a position facing the disk type detection unit 8 (see FIG. 26) provided on the floppy disk 1 so as to be fixed.
Mounted on top. Disk insertion detection switch 413
Are mounted side by side behind the write protect detection switch 411. The sensor circuit board 410 is provided with the sensor switches 411, 412, and 413, and an LED 414 for emitting and displaying the drive state of the disk drive.

On the other hand, a main control circuit in the disk drive device is mounted on the main control board 420.
Stepping motor 20 described above by the main control circuit
1 and a function of controlling the disk drive motor 303. Further, a connector 421 for connecting to an external control circuit such as a computer motherboard is mounted on the main control board 420, and also has a function as an interface.

This main control board 420 is
As shown in (a), the terminal board 205 of the stepping motor 201 described above (for example,
3), motor board 302, and sensor circuit board 4
10 and is electrically connected. The bottom plate 10a of the frame 10 has a main control board 420 as shown in FIG.
Hook-shaped lead wire holding portions 20a, 20 for hooking and holding a lead wire 422 connecting the sensor wire 410 and the sensor circuit board 410.
b and 20c are cut out and formed at appropriate places.

FIG. 18D is an enlarged right side view of a portion I in FIG. 18A, and as shown in FIG. 18D, the magnetic head unit through which the guide rod 203 described above is inserted. The guided portion 116 of the base 100 has a bottom surface 111a.
From the bottom. Therefore, a cutout hole 25 is formed in the bottom plate 10a of the frame 10 in order to avoid interference with the guided portion 116 (see FIG. 4). The lead wire holding portion 20a is formed using a portion cut out from the bottom plate 10a of the frame 10 when forming the cutout hole 25.

The lead wire holding portion 20c is cut and raised from the edge of the cutout hole 23 formed in the bottom plate 10a of the frame 10. As described above, the notch 23 is formed when the locking portion 21 that locks one end of the coil spring 68 is cut and raised, and a lead cut out from the notch 23 is used to make a lead. The line holding part 20c is formed.

As described above, the disk drive device of the present embodiment comprises the sensor circuit board 410 and the main control board 4
Since the substrate 20 is formed as a separate substrate, the size can be reduced. Compared with the case where these substrates 410 and 420 are integrally formed, there is less influence of member processing errors and expansion and contraction, and positioning during mounting is performed. The accuracy is improved. Moreover, the degree of freedom in the arrangement of the frame 10 with respect to the bottom plate 10a is increased, and a flexible device can be designed. For example, the sensor circuit board 4
10 and the main control board 420 can be mounted at different heights, and interference with surrounding components can be easily avoided.

Further, in the present embodiment, the sensor circuit board 410 and the main control board 420 are formed in a substantially rectangular shape having substantially the same width and each having little unevenness, thereby reducing waste and economical. The sensor circuit board 410 and the main control board 420 are cut out from a base material with a layout. That is, as shown in FIG. 25, by arranging the sensor circuit board 410 and the main control board 420 having substantially the same width and nearly rectangular shapes adjacent to each other in the same width, the waste of the base material is minimized. can do. In the layout shown in FIG.
Although a small portion that becomes scrap is left in the portion shown in FIG.
By cutting out a small substrate such as the terminal substrate 205 of No. 01, the base material can be used more effectively. In addition,
The present invention is not limited to the embodiments described above.

[0067]

As described above, according to the present invention,
Since the main control board and the sensor circuit board are separate boards, each board is reduced in size, and it is possible to suppress processing errors and deterioration in positioning accuracy due to expansion and contraction of members. It can be attached to Furthermore, if the main control board and the sensor circuit board are formed to have substantially the same width and each have a shape with little unevenness and a shape close to a rectangle, these boards are cut out from a rectangular base material adjacent to the front and rear at the same width. This makes it possible to minimize the amount of the base material that becomes the scrap, thereby making it possible to reduce material costs.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an external appearance of a disk drive device according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the disk drive device according to the embodiment of the present invention.

FIG. 3 is a perspective view showing a state in which various components except a slider, a carrier, and an upper cover are incorporated in a frame.

4A is a perspective view of a frame, and FIG. 4B is a plan view of the frame.

FIG. 5 is a view showing a disk drive motor unit;
(A) is a plan view, (b) is a side view, and (c) is a perspective view.

6A and 6B are views showing a lower cover, wherein FIG. 6A is a plan view and FIG.
Is a side view, and (c) is a perspective view.

FIG. 7 is a view showing a front panel, (a) is a front view,
(B) is a side view, (c) is a bottom view, and (d) is a perspective view.

FIG. 8 is an enlarged sectional view taken along the line AA of FIG.

FIG. 9 is a right side view showing a state in which a front panel is attached to the front ends of the frame and the lower cover.

10A is a front view of the frame and the lower cover as viewed from the front end side, and FIG. 10B is a partially enlarged view of FIG.

FIG. 11 is a view showing a slider, (a) is a plan view,
(B) is a side view, (c) is a perspective view, (d) is B in (a).
FIG. 3B is an enlarged sectional view taken along line B, and FIG.

FIG. 12 is a view showing a carrier, (a) is a plan view,
(B) is a side view, and (c) is a perspective view.

FIG. 13 is an exploded perspective view showing a state before a slider and a carrier are mounted in a frame.

FIG. 14 is a perspective view showing a state where the slider is mounted in the frame.

FIG. 15 is a perspective view showing a state where the carrier is mounted in the frame.

16A and 16B are diagrams showing a portion where a support piece for supporting the floppy disk from below is formed, FIG.
(B) is a longitudinal sectional view.

FIG. 17 is a view showing the operation of the opening / closing lever.

FIGS. 18A and 18B are views showing a magnetic head unit, wherein FIG. 18A is a plan view, FIG. 18B is a side view, FIG. 18C is a perspective view, and FIG. 18D is an enlarged right side view of a portion I in FIG. .

FIG. 19 is a bottom view of the upper head support member.

FIG. 20 is a side view of the upper head support member.

FIG. 21 is a side view of the upper head support member in a lifted state.

FIG. 22 is a view showing a leaf spring member, wherein (a) is a plan view,
(B) is a front view, (c) is a side view.

23A and 23B are diagrams showing various circuit boards built in the disk drive device of the present embodiment, wherein FIG. 23A is a plan view of a main control board, FIG. 23B is a plan view of a sensor circuit board, and FIG. FIG. 3B is a perspective view of a control board, and FIG.

24A is a bottom view showing a state in which each circuit board shown in FIG. 23 is mounted on a bottom plate of a frame, and FIG.
Enlarged front view of part II in FIG.
(C) is an enlarged side view of section II as viewed from the Y direction.

FIG. 25 is a plan view showing a layout on a base material of each circuit board shown in FIG. 23;

FIG. 26 is a plan view showing a floppy disk.

FIG. 27 is a plan view of a circuit board mounted on a conventional disk drive device.

[Explanation of symbols]

 1: Floppy disk 2: Case main body 2a: Exposure window 3: Magnetic disk board 4: Shutter 4a: Notch 5: Positioning hole 6: Write protect detection section 7: Slide piece 8: Disk type detection section 9: Prevention of incorrect insertion Part 10: Frame 10a: Bottom plate 10b: Side plate 10c: Back plate 10d: Bend part 10e, 10f: Projection piece (substrate support part) 11: Bearing part 12: Motor mounting part 13: Engagement hole 14: Engagement part 15 : Positioning hole 16: Support groove 17: Support piece 17a: Positioning protrusion 18: Notch hole 18a: Side edge 19: Vertical guide groove 20: Lead wire holding part 21, 22: Locking part 23, 24: Notch hole 24a : Long groove 30: lower cover 30 a: bottom plate 30 b: side plate 30 c: back plate 31: engagement hole 40: upper cover 50: front panel 51: disk insertion opening 52: shut 53: torsion coil spring 54: long hole 55: display window 56: locking piece 56a: locking claw 57: positioning projection 60: slider 60a: front plate 60b: bottom plate 60c: side plate 61: inclined guide groove 62: engagement Piece 63: Opening 64: Engagement piece 65: Engagement projection 66: Projection piece 67: Eject button 68: Coil spring 69a, 69b: Engagement piece 69c: Swelling part 70: Carrier 70a: Top plate 70b: Side plate 70c : Lower edge 71: Engagement projection for vertical movement 72: Engagement projection for diagonal relative movement 73: Notch opening 74: Torsion coil spring 75: Notch hole 80: Opening and closing lever 81: Torsion coil spring 82: Rotation Shaft 83: cam portion 83a: cam surface 84: pressing portion 100: magnetic head unit 110: lower magnetic head 111: lower head support member 112: joining plate 113: pedestal 114 Driven part 120: Upper magnetic head 121: Upper head support member 123: Push-up lever 124: Auxiliary lever 125: First leg 125a: Rotating fulcrum 126: Second leg 126a: Rotating fulcrum 130: Leaf spring member 130a: Base 131: Fastener 132: Fastening hole 133a: First cover 133b: Second cover 133: Fixing member 134: Fastener 135, 136: Press spring 200: Head drive mechanism 201: Stepping motor 202: Screw 203: Guide rod 204: Fixed plate 205: Terminal board 300: Disk drive motor unit 301: Motor fixed plate 302: Motor board 303: Disk drive motor 304: Turntable 410: Sensor circuit board 411: Write protect detection switch 412: Disc Type identification Pitch 413: disk insertion detecting switch 420: the main control board 421: connector 422: Lead wire

Claims (6)

[Claims] 1. A frame having a bottom plate and forming a frame of an apparatus, a magnetic head unit for recording and reproducing data on and from a disk, a head drive mechanism for driving the magnetic head unit, and a drive motor for rotating the disk at high speed A disk drive motor unit including a motor drive circuit for driving the drive motor, a main control board mounted with at least a control circuit for the head drive mechanism and a motor control circuit for outputting a predetermined signal to the motor drive circuit,
A disk drive device comprising: a sensor circuit board on which a sensor for detecting required information on a disk is mounted; and a main control board and a sensor circuit board mounted on a back side of a bottom plate of the frame. A disk drive device wherein the sensor circuit board and the sensor circuit board are separate boards. 2. The disk drive according to claim 1, wherein the main control board and the sensor circuit board are formed to have substantially the same width, and each of the main control board and the sensor circuit board has a shape close to a rectangle with little unevenness. apparatus. 3. The disk drive device according to claim 1, wherein a main control board is mounted on a back rear side of the frame bottom plate, and a sensor circuit board is mounted on a front rear surface of the frame bottom plate. A disk drive device wherein the main control board and the sensor circuit board are electrically connected by a lead wire. 4. The disk is a floppy (registered trademark).
The disk drive device according to any one of claims 1 to 3, wherein the sensor circuit board faces at least a write protection detection unit provided at a rear portion of one side edge of the floppy disk. A write protection detection switch for detecting whether the floppy disk is in a write-protected state, and a disk type for identifying the type of the disk in opposition to a disk type detection unit provided at the rear of the other side edge of the floppy disk. And a discrimination switch. 5. The disk drive according to claim 1, wherein the sensor circuit board is configured to fasten only one arbitrary portion to the frame. apparatus. 6. The disk drive device according to claim 5, wherein a substrate supporting portion for supporting the sensor circuit substrate in a bendable state is formed at a front portion of a bottom plate of the frame.