JP3475790B2 - Disk unit - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk device for recording or reproducing information by moving a head carriage in a radial direction of a disk-shaped recording medium. 2. Description of the Related Art For example, in a magnetic disk drive on which a flexible magnetic disk is mounted, a head carriage is moved in the radial direction of the disk so that a magnetic head slides on a predetermined track of the magnetic disk to perform magnetic recording. (Write) or reproduction (read). A head carriage mechanism used in this type of magnetic disk drive is configured to move a head carriage by rotating a lead screw with a head carriage driving motor. The head carriage has one side engaged with the lead screw and the other side guided by a guide shaft to be movably supported. [0003] The lead screw and the guide shaft are
Each is disposed parallel to both sides of the head carriage at a position apart from a position where the magnetic disk is mounted. The upper and lower arms of the head carriage extend to a position facing the recording surface (upper and lower surfaces) of the magnetic disk, and a magnetic head is supported at the tip of the upper and lower arms. Therefore, when the lead screw is rotationally driven, the head carriage moves in the disk radial direction while being guided by the guide shaft, and changes the track position where the magnetic head slides. However, in the disk drive having the above-described structure, the guide shaft is disposed so as to be located outside the magnetic disk. Was getting longer. Therefore, when the magnetic head is in sliding contact with the outermost track of the magnetic disk, the head carriage must be largely moved rearward by the length of the head carriage, and the rear projection length of the frame is accordingly increased. It was difficult to reduce the size of the device. Therefore, an object of the present invention is to provide a disk device which solves the above-mentioned problem. [0006] In order to solve the above problems, the present invention has the following features. The present invention provides a head carriage that supports a head that records or reproduces information on a disk-shaped recording medium and moves in a radial direction of the disk-shaped recording medium, a guide shaft that guides a moving direction of the head carriage, and the guide In a disk device having a frame supporting a shaft, an end of the guide shaft is formed to extend to a position facing below the disk-shaped recording medium, and a carriage mounting portion supporting the head carriage at a rear portion of the frame. If the to extend form the motor mounting portion for supporting a motor for driving the head carriage, and preparative carriage of the frame
Only the attachment portion and the motor attachment portion protrude rearward . Therefore, according to the present invention, since the end of the guide shaft is formed so as to extend to a position facing below the disk-shaped recording medium, the total length of the head carriage can be shortened. The size can be reduced to reduce the size of the device. Further, a carriage mounting portion for supporting the head carriage and a motor mounting portion for supporting a motor for driving the head carriage are formed at the rear portion of the frame so as to extend, and the carriage mounting portion of the frame is provided.
Since only the attachment portion and the motor attachment portion protrude rearward, the area of the frame is reduced, and the
In other devices, it is possible to secure a space for installing peripheral components. [0008] Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view showing a schematic configuration of a magnetic disk drive 11 to which an embodiment of a disk drive according to the present invention is applied. FIG. 2 is an exploded perspective view showing a cover, a slider, a holder, and a frame in an enlarged manner. 3A to 3C are a plan view, a rear view, and a side view showing a state where the slider and the holder are combined. As shown in FIGS. 1 to 3, a magnetic disk drive 11 includes a disk holder 12 into which a disk cartridge (not shown) is inserted, and a slider for sliding the disk holder 12 up and down by sliding back and forth. 13 are mounted on the frame 14 in a state where they are overlapped with each other. The frame 14 is provided with a head carriage mechanism 10. The head carriage mechanism 10 includes a carriage 18 that supports the magnetic heads 16 and 17 as described later, a guide shaft 23 that guides the moving direction of the carriage 18, a lead screw 24 that drives the head carriage 18, and a lead screw 24. And a carriage driving motor 25 for driving the rotation of the carriage. The slider 13 is slidably provided on the disk holder 12 in the directions A and B, and slides in the direction A by inserting a disk cartridge.
2 is lowered from the cartridge insertion / ejection position to the cartridge mounting position. The disk holder 12 has a top plate 12a and a cartridge guide portion 12 bent to hold a disk cartridge from both sides of the top plate 12a.
b, 12c. Therefore, a space surrounded by the top plate 12a and the cartridge guide portions 12b and 12c on both sides becomes a cartridge insertion portion. The top plate 12a of the disk holder 12 is provided with an opening 12d for moving the head carriage 18, and a pair of support portions 12h for rotatably supporting the lift arm 42 is cut and raised on the left side of the opening 12d. ing. A cut-and-raised portion forming an outline of an opening 12d provided at the center of the top plate 12a is provided with a fitting hole 12g for engaging with the slider 13 in order to prevent bending before the disk cartridge is inserted. ing. The slider 13 includes a flat plate 13a that slides above the disk holder 12, side surfaces 13b and 13c bent downward from both sides of the flat plate 13a, and side surfaces 13b and 13c.
c, an inclined groove 13d in which the engaging pin 12e of the disc holder 12 is fitted, and both side surfaces 14e of the frame 14,
It has a contact portion 13e that contacts the upper end of 14f, and an engaging portion 13f that engages with a fitting hole 12g provided in the center of the top plate 12a of the disc holder 12 by an eject operation. For this reason, in this embodiment, the disk cartridge 12 prevents the front end of the disk cartridge from colliding with the lower magnetic head when the disk cartridge is inserted, by the fitting hole 12g of the disk holder 12 and the engaging portion 13f of the slider 13. A contact prevention mechanism is configured.
The slider 13 is provided on the flat plate 13a of the slider 13.
13g and 13h are provided in which coil springs 51 and 52 for urging in the direction A are mounted. This opening 13
g and 13h are formed to extend in the A and B directions, and hook portions 13i and 13j to which one ends of the coil springs 51 and 52 are hooked protrude from ends in the B direction. In addition, the coil spring 5
The other ends of the discs 1 and 52 are hooked by hooks 12 i and 12 j protruding from the top plate 12 a of the disc holder 12. Therefore, the slider 13 is urged in the direction A by the spring force of the coil springs 51 and 52. FIG. 4A is a plan view showing the structure of the frame 14. As shown in FIG. FIG. 4B is a rear view showing the structure of the frame 14. As shown in FIGS. 1 to 4, a circular opening 1 into which a turntable 15 for clamping a disc is inserted is provided on a plane 14 a of the frame 14.
4b, and a carriage mounting portion 14c to which a head carriage 18 supporting the magnetic heads 16 and 17 is slidably mounted in the A and B directions. At the rear of the frame 14, a motor mounting portion 14d to which a head carriage driving motor 25 for driving the head carriage 18 is mounted is provided. Both sides of the carriage mounting portion 14c and the motor mounting portion 14d are cut in a rectangular shape.
Therefore, the rear part of the frame 14 is
Only 4c and the motor mounting portion 14d have a shape protruding rearward. Also, both side surfaces 14e, 1 of the frame 14
Guide grooves 14g and 14h for guiding the elevating operation of the disk holder 12 are provided at an intermediate position of the inner wall of 4f. Further, a circuit board 20 on which a turntable 15 and a disk motor 19 for rotating the turntable 15 are mounted is mounted on the lower surface side of the frame 14. The head carriage 18 has a carriage main body 21 which supports the lower magnetic head 16 on the top surface of the front end, and a carriage main body 21 which supports the upper magnetic head 17 on the bottom surface of the front end.
And a head arm 22 rotatably attached to the head arm 22. Further, the head carriage 18 is guided by the guide shaft 23 and the lead screw 24 extending in the front-rear direction (A and B directions), and according to the rotation amount of the lead screw 24 in the direction corresponding to the rotation direction of the lead screw 24 while being guided by the lead screw 24. Move in the disk radial direction by a distance.
The guide shaft 23 is held on a flat surface 14 a of the frame 14 by a plate-shaped pressing member (not shown), and the fitting portion 2 provided on the right side surface of the carriage main body 21.
1a. Further, the lead screw 24 is screwed to a screwing portion (not shown) provided on the left side surface on the opposite side of the carriage main body 21. The head carriage driving motor 25 for driving the lead screw 24 to rotate is connected to the frame 1
4 is mounted on the lower surface of a motor mounting portion 14d provided at the rear of the motor. Therefore, the head carriage 18 is guided by the guide shaft 23 and the lead screw 24 by the rotational driving force of the head carriage driving motor 25 that rotationally drives the lead screw 24, and moves in the disk radial direction (A and B directions). Thus, the magnetic heads 16 and 17 supported by the head carriage 18 can perform magnetic recording / reproduction by sliding in contact with desired tracks of a magnetic disk (not shown) stored in a disk cartridge. . On the plane 14a of the frame 14,
A protector 26 for preventing the end of the disk cartridge inserted into the disk holder 12 from colliding with the lower magnetic head 16 is provided so as to be slidable in the C and D directions by being guided by a pin 14i projecting above the plane 14a. Have been.
The protector 26 is connected to a pin 27 a provided at one end of an L-shaped link 27, and a pin 27 b provided at the other end of the link 27 is engaged with an engagement portion 13 k of the slider 13. Therefore, before the disk cartridge is inserted into the disk holder 12, the protector 26 is close to the side of the lower magnetic head 16. At this time, the protector 26 rides on the inclined portion 28 formed on the plane 14 a of the frame 14 and is lifted above the lower magnetic head 16. Accordingly, the disk cartridge is prevented from sliding above the protector 26 and moving above the lower magnetic head 16 to collide with the lower magnetic head 16. Then, the slider 13 slides in the direction A and separates from the lower magnetic head 16. Therefore, when the slider 13 slides in the direction A, the protector 26 slides in the direction D and descends below the inclined portion 28, and the magnetic disk is brought into contact with the lower magnetic head 16. As shown in FIGS. 1 and 5, a latch mechanism 36 for latching the slider 13 is provided at the rear of the upper surface of the disk holder 12. This latch mechanism 3
6, a latch lever 38 rotatably supported on the upper surface of the disk holder 12, a coil spring 39 for urging the latch lever 38 to rotate counterclockwise, and a slider 13
And a cam portion 46 provided on the top plate 13a. FIGS. 6A to 6E are a plan view, a side view, a rear view, an enlarged plan view, and an enlarged side view for explaining the shape of the latch lever. As shown in FIGS. 6A to 6E, the latch lever 38 has a disk holder 1 at one end.
2 has a shaft hole 38a through which the shaft at the rear of the upper surface is inserted, and a claw portion 38b at the other end which engages with a shutter (not shown) of the disk cartridge. The latch lever 38 has a hook portion 38c at which one end of the coil spring 39 is hooked at the middle in the longitudinal direction, and a sliding contact portion 38d which comes into sliding contact with the cam portion of the slider 13. The other end of the coil spring 39 is hooked on a hook 12k provided on the top plate 12a of the disc holder 12. At the upper end of the slide contact portion 38d, a latch portion 38e for preventing the slider 13 from coming off is bent. A restricting portion 38f that regulates the rotation height position is provided on the upper portion of the claw portion 38b so that the claw portion 38b is held at the insertion height position of the disc cartridge inserted into the disc holder 12. I have. FIG. 5 is an exploded perspective view for explaining the configuration of the latch mechanism. As shown in FIG. 5, the disk holder 1
At the rear of the top plate 12a, a shaft 12m inserted through the shaft hole 38a of the latch lever 38 to support the latch lever 38 so as to be rotatable in the E and F directions, and a groove 38g of the latch lever 38 at the time of assembly. Latch lever 3 after being inserted
A protrusion preventing portion 12n for restricting the upward movement of 8 protrudes. The disengagement prevention part 12n is configured such that the latch lever 38
Projections 12n ₁ for regulating the height position of the upper surface of the latch lever 38 so as not to deviate from 2m protrudes horizontally. Further, the top plate 12a of the disk holder 12 is provided with a fan-shaped opening 12o. The claw 38b of the latch lever 38 is inserted through the opening 12o. Further, on both sides of the disk holder 12,
A pair of engaging pins 12e is provided for engaging with the slider 13.
f is protruding. The guide portion 12f is used for the frame 1
The guide grooves 14g provided in the side walls 14e, 14f
14h to guide the elevating operation of the disk holder 12. On the upper surface of the disk holder 12, there is provided a head arm lift mechanism 41 for holding the head arm 22 at a raised position where it does not come into contact with the disk cartridge when the disk cartridge is not inserted. I have. This head arm lift mechanism 41
Is a lift arm 4 that contacts the lower surface of the head arm 22.
2, a lifter 43 for pressing the lift arm 42 upward in the non-inserted state, and a pressing spring 44 for pressing the lift arm 42 downward. The lift arm 42 is in contact with the lower surface of the protruding portion 22a protruding from both sides of the head arm 22, and is mounted so as to be rotatable up and down around both ends of the pressing spring 44. Below the lift arm 42, a lifter 43 that slides in the A and B directions by the sliding operation of the slider 13 is provided. Therefore, when the disk cartridge is not inserted, the lifter 43 presses the lift arm 42 upward, whereby the head arm 22 rotates upward and the upper magnetic head 17 is retracted above the disk holder 12. . Further, the disk cartridge is inserted into the disk holder 12, the slider 13 slides in the direction A, and the lifter 43 is separated from the lift arm 42. Thus, the lift arm 42 is lowered to the mounting position in a state where the holding force of the lifter 43 is removed. For this reason, the magnetic disk stored in the disk cartridge is sandwiched between the lower magnetic head 16 and the upper magnetic head 17 for magnetic recording or reproduction while the head arm 22 rotates downward. Further, the lift arm 42 is supported by a support portion 12h standing upright on the top plate 12a of the disc holder 12 with both ends of the pressing spring 44 passing through the cut-and-raised portion 42a of the lift arm 42. Since the support portion 12h is formed in a direction extending in the E and F directions, the lift arm 42 is mounted so as to be rotatable in a vertical direction orthogonal to the carriage movement direction (A and B directions). A cover 45 is provided above the slider 13 so as to cover the upper part of the frame 14. The cover 45 is screwed to both sides of the frame 14 to prevent the slider 13 from floating upward, and furthermore, the front and rear direction (A and B directions) of the slider 13.
Guide the movement of As shown in FIGS. 1, 2, 3, and 7, a cam portion 46 for engaging the above-mentioned latch lever 38 is provided on the flat plate 13 a of the slider 13. The cam portion 46 has an arc-shaped portion 47 in which the sliding portion 38d of the latch lever 38 slides while moving in the rotating direction in the process of inserting the disk cartridge, and an arc-shaped portion 47 when the insertion of the disk cartridge is completed. Escape portion 48 formed in a direction away from the sliding contact portion 38d passing through
And The flat plate 13a of the slider 13 has
The cam portion 46 is formed, and a fan-shaped opening 49 for moving with the sliding portion 38d inserted is provided. Further, outside the opening 49, the latch lever 38 is provided.
And an arc-shaped opening 50 which is provided at the tip of the disk cartridge and faces the rotation range of the claw portion 38b which engages with the shutter of the disk cartridge. Further, a contact portion 53 extending in the direction B is provided at the rear of the flat plate 13a of the slider 13.
The contact portion 53 is a motor mounting portion 14 provided at the rear portion of the frame 14 while the slider 13 slides in the A and B directions.
d, and comes into contact with the guide wall 52 rising above
3 to guide the sliding operation and prevent the slider 13 from rotating during the eject operation. FIG. 8 is a plan view of the frame 14. FIG.
As shown in FIG. 5, one end of the lead screw 24 is coupled to the rotation shaft of the head carriage driving motor 25,
The other end is rotatably supported by a bearing 40. In addition, the head carriage 18 has an engaging pin 61 that engages with the lead screw 24 at a protruding portion 60 extending in the C direction from the left side surface of the carriage body 21. The engaging pin 31 is fixed to the projecting portion 60 so as to engage between spiral threads formed on the outer periphery of the lead screw 24. On the right side of the carriage body 21,
Bearing portion 6 slidably fitted on guide shaft 23
2, 63 are provided. The guide shaft 23 is formed so as to extend to a position where one end 23 a faces the lower surface of the magnetic disk 64 (indicated by a dashed line) mounted on the turntable 15. Thereby, the head carriage 18
Since the position guided by the guide shaft 23 is extended toward the center of the disk as compared with the conventional one, the carriage body 21 of the head carriage 18 and the head arm 2
2 can be reduced in length (length in the directions A and B). As a result, the moving distance of the head carriage 18 backward (in the direction B) is shorter than that of the conventional apparatus,
The length of the frame 14 projecting rearward can be reduced accordingly. Therefore, the magnetic disk drive 11 is downsized because the moving range of the head carriage 18 is shifted toward the center of the magnetic disk 64 for the above-described reason. FIG. 9 is a plan view showing a state in which the head carriage 18 has moved to the inner peripheral side of the disk. As shown in FIG. 9, one end 23a and one end 2 of the guide shaft 23 are provided.
Since the bearing portion 62 for bearing 3a is disposed below the disk 64, the head carriage 18 is stably supported even when the head carriage 18 moves to the inner peripheral side of the disk. Therefore, even when the total length (length in the directions A and B) of the carriage main body 21 and the head arm 22 of the head carriage 18 is reduced, stability when the head carriage 18 moves to the inner peripheral side of the disk is secured. FIG. 10 is an exploded perspective view of the holding mechanism for holding the guide shaft 23 as viewed from above. FIG.
FIG. 4 is an exploded perspective view of a holding mechanism that holds the guide shaft 23 as viewed from below. FIG. 12 shows the guide shaft 2
It is a perspective view which shows the attachment state of 3. As shown in FIGS. 10 to 12, the guide shaft holding mechanism 65 is arranged at a position facing the head carriage 18 and is provided so as to overlap the head carriage 18 when viewed from above. Space saving is achieved compared to the case where it is provided on the side. The guide shaft holding mechanism 65 includes bearings 66 to 68 provided on the frame 14 and a pressing member 69 for pressing the guide shaft 23 against the bearings 66 to 68.
Consists of The bearing 66 is formed in a U-shape, and has a horizontal portion 66a fixed on the frame 14, and upright portions 66b, 66c for holding the guide shaft 23 from both sides. For this reason, one end of the guide shaft 23
The outer periphery has a horizontal portion 66a and vertical portions 66b, 66c of the bearing 66.
And held at the three points. Also, the bearing 66
The end of the guide shaft 23 is connected to the inner wall 7 of the frame 14.
The guide shaft 23 is held in a state in which the guide shaft 23 is in contact with the guide shaft 23 (shown by a dashed line in FIG. 11). Also, bearings 67, 68
Are formed in an L shape, and are integrally fixed on the frame 14. The rectangular through holes 71, 7 penetrating the frame 14 are provided on the sides of the bearings 67, 68.
2 are provided. The bearings 67, 68 have horizontal portions 67a, 68a fixed on the frame 14, and vertical portions 67b, 68b vertical to the side opposite to the through holes 71, 72. The pressing member 69 includes a fixing portion 69a fixed to a mounting portion 73 on the lower surface of the frame 14 by a screw 74,
Arms 69b and 69c are formed to extend upward at predetermined angles from both ends of fixing portion 69a, and reinforcing ribs 69d and 69d formed on both sides of fixing portion 69a. The arms 69b and 69c of the pressing member 69 are inserted into the through holes 71 and 72 from below, respectively, and the tip portions thereof are bearings 67 and 68, respectively.
The outer circumference of the guide shaft 23 placed on the
b, 68b. FIG. 13 is a longitudinal sectional view showing the mounting state of the bearing 67. As shown in FIG.
Reference numeral 3 is held at three points: horizontal portions 67a, 68a of bearings 67, 68, upright portions 67b, 68b, and arms 69b, 69c of pressing member 69. FIG. 14 is a longitudinal sectional view showing a mounting state of the bearing 68. As shown in FIGS. 14 and 11, the arm 69b of the pressing member 69 is provided with a contact portion 69c with which the other end of the guide shaft 23 contacts. The contact portion 69c regulates the axial attachment position of the other end of the guide shaft 23. Therefore, the guide shaft 2
3 is held in a state where one end is in contact with the inner wall 70 of the frame 14 and the other end is in contact with the contact portion 69c of the arm 69b of the pressing member 69. As described above, the guide shaft holding mechanism 65
Then, the pressing member 69 is fixed to the lower surface side of the frame 14, and the arm portions 69 b and 69 c are inserted through the through holes 71 and 72 to press and hold the guide shaft 23 from the side. Space for providing 69 is not required, and space saving can be promoted. In the above embodiment, a magnetic disk device on which a flexible magnetic disk is mounted has been described by way of example. However, the present invention is not limited to this, and a disk device using a disk-shaped recording medium may be used. If it is, it can be applied to other types of devices. As described above, according to the present invention, since the end of the guide shaft is formed so as to extend to a position facing below the disk-shaped recording medium, the total length of the head carriage can be shortened. Accordingly, the depth dimension of the device can be reduced, and the size of the device can be reduced. Further, a carriage mounting portion for supporting the head carriage and a motor mounting portion for supporting a motor for driving the head carriage are formed at the rear portion of the frame so as to extend and carry the frame .
Because only the carriage attachment and motor attachment protruded rearward ,
The area of the frame is reduced, and the disk device is incorporated
In other devices, the installation space for peripheral components can be secured.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view showing a schematic configuration of a magnetic disk drive to which an embodiment of a disk drive according to the present invention is applied. FIG. 2 is an exploded perspective view showing a cover, a slider, a holder, and a frame in an enlarged manner. FIG. 3 is a diagram showing a state where a slider and a holder are combined. FIG. 4 is a diagram showing a configuration of a frame. FIG. 5 is an exploded perspective view for explaining a configuration of a latch mechanism. FIG. 6 is a diagram for explaining a shape of a latch lever. FIG. 7 is a diagram for explaining a shape of a slider. 8 is a plan view of the frame 14. FIG. FIG. 9 is a plan view showing a state where the head carriage 18 has moved to the inner peripheral side of the disk. FIG. 10 is an exploded perspective view of a holding mechanism that holds the guide shaft 23 as viewed from above. FIG. 11 is an exploded perspective view of a holding mechanism that holds the guide shaft 23 as viewed from below. FIG. 12 is a perspective view showing an attached state of a guide shaft 23. FIG. 13 is a longitudinal sectional view showing a mounting state of the bearing 67. FIG. 14 is a longitudinal sectional view showing a mounting state of a bearing 68. DESCRIPTION OF SYMBOLS 10 Head carriage mechanism 11 Disk device 12 Holder 13 Slider 14 Frame 15 Turntable 16, 17 Magnetic head 18 Head carriage 23 Guide shaft 24 Lead screw 25 Head carriage driving motor 64 Magnetic disk 65 Guide shaft holding mechanism 66 ~ 68 Bearing 69 Pressing members 71,72 Through hole

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 21/00-21/06 G11B 33/12

Claims (1)

(57) Claims 1. A head carriage that supports a head for recording or reproducing information on a disk-shaped recording medium and moves in a radial direction of the disk-shaped recording medium, and movement of the head carriage In a disk device having a guide shaft for guiding a direction and a frame for supporting the guide shaft, an end of the guide shaft is formed to extend to a position facing below the disk-shaped recording medium, and a rear portion of the frame A carriage mounting portion for supporting the head carriage, and a motor mounting portion for supporting a motor for driving the head carriage are formed to extend, and only the carriage mounting portion and the motor mounting portion of the frame are provided behind.
A disk device characterized by protruding in the direction .