JP2002150747A - Magnetic disk driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic disk driving device capable of corresponding also to a USB only by one printed board by fitting the printed board in a floated state in a chassis so that both faces of the printed board can be used. SOLUTION: Since the printed board 3 mounting various electric parts for transmitting a control signal to a stepping motor 11 or the like is fitted to the chassis 2 in a state floated from the bottom plate 2a of the chassis 2 by a prescribed height, many electric parts can be mounted on both the faces of the printed board 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a magnetic disk drive, and more particularly to a method for recording / recording information on a magnetic disk.
The present invention relates to a magnetic disk drive device used by mounting a disk cartridge containing a magnetic disk as an information recording medium for reproduction.

[0002]

2. Description of the Related Art Conventionally, this type of magnetic disk drive 21
Referring to FIG. 4, a chassis 2 made of a metal plate will be described.
The chassis 22 includes a bottom plate 22a and a support plate 22b formed by bending a rear end (upper side in the figure) of the bottom plate 22a upward. And the bottom plate 22a
A printed circuit board 23 is attached to the back surface of the device in close contact with a mounting screw or the like. The bottom plate 22a is provided with a substantially oval-shaped through hole 22c, and an FPC mounting portion (not shown) of the printed circuit board 23 is located in the through hole 22c so as to be visible from above.

A turntable 24 having a spindle motor (not shown) for mounting and rotating a recording disk (not shown) is rotatably mounted on the bottom plate 22a. Further, on the turntable 24, a slide plate 25 for inserting and removing a recording disk from the turntable 24 is attached to the chassis 22. At the upper part of the slide plate 25, a disk holder 26 that can hold a recording disk that is slid by the slide plate 25 with both right and left ends bent in a U-shape is provided.

A carriage 27 that can reciprocate toward the turntable 24 is disposed substantially at the center of the chassis 22 on the upper side of the turntable 24 in the drawing. The carriage 27 includes a hold case 27a to which an upper magnetic head 28 is attached, and a base 27b to which a lower magnetic head 29 is attached with a predetermined gap on the lower side facing the upper magnetic head 28. The hold case 27a is moved up and down by the up and down movement of the disk holder 26, so that the upper magnetic head 28 can be moved up and down to the lower magnetic head 29 side. A guide shaft (not shown) that supports the carriage 27 so as to be able to reciprocate toward the turntable 24 is attached to the bottom plate 22 a of the chassis 22 at the base 17 b on the left side of the carriage 27 in the drawing.

The carriage 27 is connected to the turntable 2.
Stepping motor 31 for reciprocating to the 4 side
Are attached to the outside of the support plate 22b of the chassis 22. The stepping motor 31 is attached to the support plate 22b such that the rotation shaft 31a protrudes inward of the chassis 22. The arm 27b of the carriage 27 engages with a spiral groove formed on the rotating shaft 31a, and the carriage 27 can reciprocate by the rotation of the stepping motor 31. Printed circuit board 2 located in through hole 22c of chassis 22
The FPC mounting portion 3 has an FPC extending from the carriage 27.
A PC (flexible printed circuit board) 32 is attached and soldered to a circuit pattern on the back side of the printed circuit board 23. The FPC 32 is connected to the respective magnetic heads 28 and 29.

The printed circuit board 23 is mounted on the chassis 22.
The connector 23a, 23b to be connected to an external device is attached to the protruding portion of the support plate 22b from the support plate 22b. An FPC for transmitting a drive signal to the stepping motor 31 is provided on the protruding portion of the printed circuit board 23.
(Not shown), or an FPC (not shown) connected to a zero track sensor (not shown) for detecting that the carriage 27 has returned to the home position at the top of the figure.

Recently, a USB (Universal Serial B)
A new standard has emerged in response to personal computers called us), and devices that comply with this standard have come to be marketed. In this new standard, various peripheral devices (hereinafter, referred to as devices), such as a keyboard, a mouse, and a game controller, are all formed by connectors of the same shape, and are used by connecting the connectors to a USB port of a personal computer. .

The USB port has four pins inside, and each pin is formed as a D + and D- data line, a power supply pin, and a ground pin. Either the D + pin or the D- pin is used, and by pulling up (switching on) one of the pins, it is recognized that the recording disk is connected,
By pulling down (switch OFF),
It was recognized that the recording disk was not connected. When such a USB interface is supported, a new board (not shown) is attached to the chassis 22 separately from the printed board 23 because there is no space for attaching the connector to the printed board 23. .

[0009]

However, in such a conventional magnetic disk drive 21, the printed circuit board 23 is mounted on the back side of the bottom plate 22a of the chassis 22, so that the FPC 22 is mounted on the printed circuit board 23 and soldered. In order to attach, the magnetic disk drive 21 had to be turned over and soldered to the circuit pattern on the printed circuit board 23.

[0010] Further, in order to support the USB interface, a new board must be mounted separately from the printed circuit board 23, resulting in an increase in cost. SUMMARY OF THE INVENTION The present invention provides a magnetic disk drive capable of mounting a printed circuit board inside a chassis and using both sides of the printed circuit board so that a single printed circuit board can support USB in order to solve the above-mentioned problems. It is intended to do so.

[0011]

According to a first aspect of the present invention, there is provided a magnetic disk drive including a turntable rotatable with a magnetic recording medium mounted thereon and a magnetic head. A carriage, a stepping motor for reciprocating the carriage to the turntable side, a chassis having a bottom plate on which the stepping motor is mounted, and a printed circuit board on which various electric components for transmitting control signals to the stepping motor and the like are mounted. And the printed circuit board is attached to the chassis in a state of being floated from the bottom plate by a predetermined height.

As a second means for solving the above problem, the chassis has a side plate surrounding the bottom plate by the drawing, and a part of the side plate is directed inward of the chassis. The printed circuit board was attached to the board mounting portion at a predetermined height from the bottom plate.

According to a third aspect of the present invention, the carriage includes a reciprocally movable base having a lower magnetic head mounted thereon by engaging a guide shaft mounted on the bottom plate; A hold case having an upper magnetic head mounted on an upper side opposed to the lower magnetic head, wherein the carriage can reciprocate with the end of the printed circuit board positioned between the hold case and the base. Was adopted.

As a fourth solution to solve the above-mentioned problem, a terminal of a wide flexible printed board for transmitting a control signal or the like to the stepping motor or the like is provided on the printed board. The terminal is connected to the connector disposed on the surface in an upright state, and the terminal section in the upright state is bent downward on the printed circuit board side and connected to the connector.

According to a fifth aspect of the present invention, in the flexible printed circuit board, the height of the terminal portion after the bending is equal to or less than the height of the side plate of the chassis. The configuration was adopted.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A magnetic disk drive according to the present invention will be described with reference to the drawings. First, FIG. 1 is a top view of a magnetic disk drive of the present invention, FIG. 2 is a schematic diagram illustrating a positional relationship between a printed board and a carriage according to the present invention, and FIG. 3 is a printed board according to the present invention. It is a principal part side view explaining the attachment structure to the chassis.

FIG. 2 shows a magnetic disk drive 1 according to the present invention.
As shown in the figure, a chassis 2 made of a metal plate is provided,
The chassis 2 is formed by drawing around a flat bottom plate 2a to form a side plate.
b, a right side plate 2c is formed on the right side in the figure. Also,
As shown in FIG. 1, the side plate of the chassis 2 has a rear plate 2d at the upper end, a front plate 2e at the lower end, and a left plate 2b, a right plate 2c, a rear plate 2d, and a front plate around the bottom plate 2a. 2
e. A tongue-shaped first substrate mounting portion 2f for mounting a printed circuit board 3 described later is cut and formed on the left side plate 2b shown in FIG. A part of the rear plate 2d is bent to form a tongue-shaped second substrate mounting portion 2g. Also, the left and right side plates 2b, 2
At c, mounting screw portions 2h are provided at four positions for mounting the magnetic disk drive of the present invention to a device such as a personal computer (not shown).

A hard printed board 3 made of phenol resin or the like is attached to the first and second board attaching portions 2f and 2g with small screws 3a. That is, the printed circuit board 3 is attached to the chassis 2 while being floated at a predetermined height from the bottom plate 2 a of the chassis 2. Therefore, electric components can be mounted on both sides of the printed circuit board 3, and many electric components can be mounted efficiently. As shown in FIG. 1, the printed circuit board 3 attached to the chassis 2 has a first connector 3b having a longer width in the left-right direction in the drawing near the rear plate 2d and an illustration of the first connector 3b. A second connector 3c having a smaller width than the first connector 3b is attached to a lower right portion, and a pair of third connectors 3d are attached near the left side plate 2b. An FPC (not shown) extending from an external device such as a personal computer can be connected to the first connector 3b, and a stepping motor 11 and a zero track (described later) are connected to the second connector 3c. A first FPC 14 extending from the sensor 13 is connectable. A second FP extending from a carriage 7 described later is connected to the third connector 3d.
C15 can be connected.

A turntable 4 having a spindle motor (not shown) for mounting and rotating a recording disk (not shown) as a magnetic recording medium is rotatably mounted on the bottom plate 2a of the chassis 2. ing. Also,
On the turntable 4, a disk holder 5, which has a left and right end portion bent in a U-shape and holds a recording disk (not shown) slid by a slide plate 6, which will be described later, and a recording disk, A slide plate 6 for sliding and inserting into and removing from the turntable 4 is provided. An eject button 6a for the operator to slide the slide plate 6 is provided below the slide plate 6 in the figure.
Is attached.

A carriage 7 that can reciprocate toward the turntable 4 is provided substantially at the upper center of the chassis 2 above the turntable 4 in the drawing. As shown in FIG. 2, the carriage 7 has a hold case 7a to which the upper magnetic head 8 is attached, and a base 7b to which the lower magnetic head 9 is attached with a predetermined gap on the lower side facing the upper magnetic head 8. The upper magnetic head 8 can be moved up and down to the lower magnetic head 9 by the vertical movement of the hold case 7a. Also, the carriage 7 is shown in FIG.
As shown in FIG. 7, the carriage 7 can reciprocate toward the turntable 4 with the right end of the printed circuit board 3 shown in the figure positioned between the hold case 7a and the base 7b. Therefore, the printed circuit board 3 can be enlarged in area by overlapping the right end in the drawing on the base 7b, so that more electric components can be mounted on the printed circuit board 3.

The carriage 7 has a base 7 shown in FIG.
b is slidably engaged with the guide shaft 10, and an arm 7c extending rightward in the drawing of the base 7b
It can be engaged with a helical screw groove formed on a rotating shaft 11b of the stepping motor 11, which will be described later.
Both ends of the guide shaft 10 are fixed to the bottom plate 2a by a shaft keeper 12 shown in FIG.

In the chassis 2 shown in FIG. 1, a concave portion 2j is formed on the right side in the figure where the carriage 7 is provided, and the stepping motor 11 can be mounted on the rear plate 2d where the concave portion 2j is formed. ing. The stepping motor 11 attached to the rear plate 2d where the concave portion 2j is formed is such that the position of the rear end 11a is substantially the same as the outer surface of the rear plate 2d behind the carriage 7.

The stepping motor 11 shown in FIG.
A zero track sensor 13 for detecting that the carriage 7 has returned to the uppermost home position in the figure is attached to the rear plate 1d behind the carriage 7 on the left side of the carriage 7. A first FPC 14 extends from the stepping motor 11 and the zero track sensor 13 and is connected to a second connector 3c of the printed circuit board 3. A second FPC 15 connected to the upper magnetic head 8 and the lower magnetic head 9 extends from the carriage 7 and is connected to a third connector 3d of the printed circuit board 3.

In the magnetic disk drive 1 of the present invention, since the printed circuit board 3 is mounted on the chassis 2 in a state of being lifted from the bottom plate 2a at a predetermined height, a circuit pattern is formed on both sides of the printed circuit board 3 and both sides are formed. It can be a double-sided board to which an electric component such as an IC can be attached. Therefore, even in the case where the USB interface is supported as described in the conventional example, the USB interface can be supported by one printed circuit board 3 without attaching another board.

The first FPC 14 has a large number of wiring patterns for transmitting signals to the stepping motor 11 and the zero-track sensor 13, respectively, and has a large width. Therefore, as shown in FIG. 3, when the terminal portion 14a is connected to the second connector 3c in an upright state as shown by a two-dot chain line, the height of the terminal portion 14a becomes higher than the height of the left side plate 2b and the rear side plate 2d. , Cover 16 with chassis 2
The upper part of the lid cannot be closed.

As a countermeasure, in the magnetic disk drive 1 of the present invention, the terminal portion 14a of the first FPC 14 connected to the second connector 3c in an upright state is bent downward in the direction of arrow A on the printed circuit board 3 side, as shown in FIG. The terminal portion 14a is
It is sandwiched between the connector 3b. And the first F
The PC 14 is bent such that the height of the terminal portion 14a after bending is equal to or less than the height of the left and right side plates 2b, 2c. Therefore, the cover 16 is
, The cover 16 can be normally attached to the chassis 2 and the lid can be closed.

[0027]

According to the magnetic disk drive of the present invention, the printed circuit board is mounted on the chassis while being floated from the bottom plate of the chassis by a predetermined height. Electrical components can be attached to the surface. Therefore, many electric components can be mounted on a small printed circuit board, and USB
In the case of interface support, it is possible to cope with an increase in the number of electrical components attached to the printed circuit board.

The side plate is formed by drawing around the bottom plate, and a part of the side plate is cut and bent toward the inside of the chassis so that the board mounting portion is located at a predetermined height from the bottom plate. Since the printed circuit board is formed and the printed circuit board is mounted on the board mounting portion, a strong and strong chassis can be provided by drawing. By attaching the printed circuit board to such a strong chassis, it is possible to eliminate problems such as breakage of the printed circuit board due to twisting of the chassis, and to provide a high quality magnetic disk drive.

Also, the carriage can be reciprocated while the end of the printed circuit board is located between the hold case and the base, so that the printed circuit board is formed large so as to overlap the base of the carriage. Thus, the number of components mounted on the printed circuit board can be further increased.

Further, a terminal portion of a wide flexible printed circuit board for transmitting a control signal or the like to the stepping motor or the like is connected to the printed circuit board in an upright state with a connector arranged on the surface of the printed circuit board. Since the terminal portion in the upright state is bent downward on the printed circuit board side and connected to the connector, the cover can be properly attached to the chassis without the FPC hitting the cover that closes the lid from above the chassis.

In addition, since the height of the terminal portion of the flexible printed circuit board after bending is equal to or less than the height of the side plate of the chassis, the cover can be more securely attached to the chassis.

[Brief description of the drawings]

FIG. 1 is a top view of a magnetic disk drive according to the present invention.

FIG. 2 is a schematic sectional view illustrating a positional relationship between a printed circuit board and a carriage according to the present invention.

FIG. 3 is a main part side view for explaining a printed circuit board mounting structure according to the present invention.

FIG. 4 is a top view of a conventional magnetic disk drive.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic disk drive 2 Chassis 2a Bottom plate 2b Left side plate 2c Right side plate 2d Back side plate 2e Front side plate 2f 1st board attachment part 2g 2nd board attachment part 2h Attachment screw part 2j Depression 3 Printed circuit board 3a Small screw 3b 1st connector 3c Second connector 3d Third connector 4 Turntable 5 Disk holder 6 Slide plate 7 Carriage 7a Hold case 7b Base 8 Upper magnetic head 9 Lower magnetic head 10 Guide shaft 11 Stepping motor 12 Shaft keeper 13 Zero track sensor

Claims (5)

[Claims] 1. A turntable rotatable with a magnetic recording medium mounted thereon, a carriage on which a magnetic head is mounted, a stepping motor for reciprocating the carriage to the turntable, and the stepping motor. A chassis having a bottom plate, and a printed circuit board on which various electric components for transmitting control signals to the stepping motor and the like are provided, and the printed circuit board is mounted on the chassis while being floated at a predetermined height from the bottom plate. A magnetic disk drive characterized by the above-mentioned. 2. The chassis has a side plate surrounding the periphery of the bottom plate by drawing, and a part of the side plate is cut and bent inward of the chassis to a predetermined height from the bottom plate. 2. The magnetic disk drive according to claim 1, wherein a substrate mounting portion is formed, and the printed circuit board is mounted on the substrate mounting portion. 3. The carriage includes a base reciprocally movable on which a lower magnetic head is mounted by engaging a guide shaft mounted on the bottom plate, and an upper magnetic head on an upper side facing the lower magnetic head. 3. The carriage according to claim 1, wherein the carriage is reciprocally movable with an end of the printed circuit board positioned between the hold case and the base. A magnetic disk drive according to any one of the preceding claims. 4. A terminal of a wide flexible printed circuit board for transmitting a control signal or the like to the stepping motor or the like is connected to the printed circuit board in an upright state with a connector disposed on a surface of the printed circuit board. 2. The magnetic disk drive according to claim 1, wherein the terminal portion in the upright state is bent downward on the printed circuit board side and connected to the connector. 5. The magnetic disk drive according to claim 4, wherein said flexible printed circuit board has a height of said terminal portion after said bending is equal to or less than a height of said side plate of said chassis. apparatus.