JP2003317364A - Disk drive device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a miniaturized carriage by appropriately locating respective components. <P>SOLUTION: A carriage main body 70 provided with a lower arm 74 is formed with a recess 70a. An upper arm 72 is located to freely turn on the carriage main body 70. A presser spring 82 presses tops of the upper arm 72 and the lower arm 74 to make them approximate each other. The presser spring 82 has a coil portion 82a and a presser portion 82b to be abutted to the upper arm 72. The coil portion 82a located highest on the outer periphery is located lower than the presser portion located highest, and is located lower than an upper surface of the carriage. <P>COPYRIGHT: (C)2004,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a computer and an OA.
The present invention relates to a disk drive device for recording and reading out recorded information by rotating a disk-shaped recording medium such as a floppy disk used as a recording medium of a device or the like. [0002] In recent years, with the personal use of computers and OA equipment, miniaturization of these equipment has been promoted. The storage medium of these devices includes a floppy disk and a hard disk. When these disks are used as recording media, a device for driving the disks to rotate, a device for reading and writing, and the like are required. For example, in a floppy disk drive device, a disk is stored in a cassette,
Insertion / ejection of this cassette is performed, and the movement from the position where the insertion / ejection is performed to the position where the disk is actually driven to rotate, and the insertion / ejection responsible for the movement in the opposite direction.
An unloading mechanism is required. Further, a shutter opening / closing mechanism for opening a shutter provided on the cassette when the cassette is inserted and exposing the magnetic disk directly to the read / write head is also provided. Further, a head for recording information on a plurality of tracks provided on concentric circles of the disk or reading out the recorded information, and driving a carriage on which the head is arranged to position the head on a desired track. And a carriage drive mechanism for matching the two. Further, a drive mechanism for rotating and driving the disk, an interface connector for exchanging information with an external device, and the like are provided. [0004] As described above, with the personal use of OA equipment and the like, it is desired to reduce the size of these equipments. There is. This device has a problem that it is difficult to reduce the size because it has many movable mechanisms as described above. The present invention has been made to solve the above-mentioned problems, and has as its object to reduce the size of a carriage, which is one of the main components of a disk drive. In order to achieve the above object, a disk drive according to the present invention has a new structure in which the structure of a carriage having a recording / reading head is reviewed. The size is reduced. The carriage has a carriage main body including a lower arm having a lower head disposed at the tip, an upper arm rotatably supported by the carriage main body and having an upper head disposed at the tip, and the upper arm having the lower arm connected to the lower arm. And a pressing spring having a coil portion for biasing in a direction to approach the arm. [0008] Further, the pressing spring includes a coil portion,
A holding portion extending from the coil portion and abutting on the upper arm, wherein a winding center of the coil portion is located below a portion located at an uppermost position of the holding portion and located below an upper surface of the carriage. ing. Thus, the pressing spring can be arranged so as not to protrude from the upper surface of the carriage body. An embodiment of the present invention (hereinafter, referred to as an embodiment) will be described below. In the disk drive device of the present embodiment, the arrangement of a carriage having a head disposed at the tip thereof, and the arrangement of a carriage drive mechanism for driving the carriage and moving the head onto a desired track of the disk. The arrangement of a zero-zero track sensor for detecting that the head position is the outermost track (zero-zero track) of the disk has been reviewed, and the miniaturization has been achieved by providing a new configuration. The carriage driving mechanism is provided in parallel with a carriage driving motor, a carriage moving direction, a feed screw which is rotationally driven by the carriage driving motor, and is screwed with the feed screw. It includes a feed screw receiver fixedly arranged, and a track zero-zero sensor for detecting a carriage position at which the head faces the outermost track on the recording medium. The carriage driving motor is arranged in parallel with the feed screw, and the carriage driving motor and the track zero zero sensor are arranged so as not to protrude from the rear end of the carriage when the carriage is at the retracted position. Further, the carriage includes a carriage body including a lower arm having a lower head disposed at a tip thereof, an upper arm rotatably instructed by the carriage body and having an upper head disposed at a tip, and an upper arm having an upper head disposed at a tip thereof. A holding spring biasing in a direction to approach the lower arm. The coil portion of the pressing spring is disposed in the carriage main body, and is preferably disposed so as not to protrude from the rear end of the carriage. With the above-described configuration, when the carriage is at the most retracted position, the rear end thereof is arranged to substantially coincide with the rear end of the disk drive. In other words, when the carriage retreats, no other components are arranged further behind the rear end of the carriage. Since the operation of the carriage is an operation that is indispensable to move the head to a position facing a desired track, the depth of the disk drive device cannot be reduced from the last retreat position. That is, it can be seen that the arrangement in which the rear end of the carriage at the retreat position is the rear end of the apparatus has the smallest dimension in terms of depth, and therefore the apparatus is downsized. FIG. 1 is a plan view of a floppy disk drive according to the present embodiment. The frame 10 is provided with a carriage, a carriage driving mechanism, a cassette mounting mechanism, a disk driving mechanism, and the like, which will be described later. The cassette in which the magnetic disk is stored is inserted from the right side in FIG. 1 and is held by the carrier 12 and fixed on the chuck table 14. At the time of taking out the cassette, the eject button 16 is pushed from the right in the figure, the slide plate 18 is moved, the carrier is moved to the take-out position, and the cassette is ejected. This operation is shown in FIGS.
Will be described in more detail. The cassette 22 containing the magnetic disk 20 is inserted into the carrier 12 from the right in FIG. Projections 24 are provided at the four corners of the carrier 12, and the projections 24 are engaged with engagement grooves 26 provided at the four corners of the slide plate 18. In addition, this projection 24
Are also engaged with the guide grooves 28 (see FIG. 3) provided in the frame 10. Therefore, the protrusion 24 can move in the guide groove 28 in the vertical direction. In other words, the carrier 12 is allowed to move only relative to the frame 10 in the vertical direction. The position where the cassette 22 is inserted and the position where the cassette 22 is ejected are when the carrier is located at an upper position, and FIG. 3A shows this state. As the insertion of the cassette 22 proceeds, the leading end of the cassette comes into contact with the leading end 32 of the lock lever 30 (see FIG. 1). The lock lever 30 is rotatably supported by a shaft 34. When the insertion of the cassette 22 proceeds further, the lock lever 30 is pressed against the tension of the biasing spring 40 to rotate the shaft 34.
1 is rotated clockwise in the plane of FIG. At the other end of the lock lever 30, an engagement cam portion 36 is provided. The engagement cam portion 36 is in contact with a cam receiving portion 38 provided at the rear end of the slide plate 18. The slide plate 18 is always urged rightward in the drawing by the urging spring 42, but the rightward movement is regulated by the engagement cam portion 36 abutting on the cam receiving portion 38. When the cassette 22 is further inserted and reaches the mounting position indicated by the broken line 22a, the engaging cam portion 36 and the cam receiving portion 38 do not engage with each other, and move rightward due to the pulling force of the urging spring 42 described above. . By this movement, the projection 24 of the carrier 12 is moved downward in FIGS. 2 and 3 by the engagement groove 26 of the slide plate 18. Carrier 1
2 is urged downward in FIGS. 2 and 3 by an urging spring (not shown) hooked on a hook 44 provided on a side surface thereof. Accordingly, the carrier 12 is reliably moved downward by the movement of the slide plate 18, and the cassette 22 is securely fixed at a predetermined position on the chuck table 14. FIG. 3B shows the state of the projection 24 and the like at this time. When the cassette 22 is inserted, the leading end 32 of the lock lever 30 is inserted into the notch 4 of the cassette 22.
8 and then, with the rotation of the lock lever 30,
The shutter 50 of the cassette 22 is moved in the lower left direction in FIG. Then, the positions of the window 52 of the shutter 50 and the window 54 of the cassette 22 coincide with each other, and the disc 20 is exposed. The magnetic disk 20 is driven to rotate by a drive shaft 56. The drive shaft 56 is fixed to a pulley 58, and the pulley 58 is connected to a spindle motor 6 via a belt 60.
Rotated by 2. The upper head 64 and the lower head 66 record and read information on tracks on the disk 20 in the circumferential direction. The lower head 66 is not shown in FIG. 1 because it is located at the same position as the upper head 64. The heads 64 and 66 are fixed to a carriage 68, and the head 6 is moved by moving the carriage 68.
The position of the 4,66 relative to the disk 20 can be changed. Thus, the heads 64 and 66 can be positioned on a desired track, and recording / reading can be performed. The carriage drive mechanism will be described later. FIG. 4 is a sectional view of the carriage 68. An upper arm 72 and a lower arm 74 are disposed on the carriage body 70 at the top and bottom, respectively. The material of the lower arm 74 is stainless steel, which itself has elasticity. And it is pressed from below by the lower arm spring mounting plate 76 and is in close contact with the carriage body. The lower head 66 is fixed to the tip of the lower arm 74. The upper arm 72 is supported by a support portion 78 of the carriage body 70 at a fulcrum 8 at one end thereof.
0 and is urged downward by a holding spring 82. An upper head 64 is provided at the tip of the upper arm 72.
Has been fixed. The pressing spring 82 has its coil portion 82a housed in the concave portion 70a of the carriage main body 70, and is arranged so as not to protrude from the rear end of the carriage 70. As shown in the figure, the coil portion 82a of the holding spring 82 is disposed in a direction perpendicular to the rotation direction of the upper arm 72, and the holding spring 82 is used for opening and closing the upper and lower arms 72 and 74. Acts as a torsion spring. The pressing portion 82b of the pressing spring 82, which contacts the upper arm 72 from above and presses the upper arm 72 downward, once extends upward from the coil portion 82a, and then slightly downward toward the side. Extending. This allows
The uppermost portion of the outer periphery of the coil portion 82a is disposed below the uppermost portion of the pressing portion and below the upper surface of the carriage. When the disk 20 is mounted on the carriage 68, the upper and lower heads 64 and 66 are closed as shown in FIG. However, since the disc cannot be taken in and out as it is, the upper and lower heads 6
4, 66 are open. This opening and closing is shown in FIG.
Is an arm lifter 84 shown in FIG. The arm lifter 84 is
It is rotatably supported by the bearing 86, and the tip 88 moves in a direction perpendicular to the plane of the drawing with this rotation. The arm lifter 84 has a tip end 88 urged in the depth direction of the paper by an arm lifter spring 90, while the tip end 88 also contacts a lifter receiving portion 92 of the carriage 68. When the cassette 22 is mounted, the arm lifter 84 is positioned in the depth direction of the paper by the urging force of the arm lifter spring 90, and the upper and lower heads 64, 66 shown in FIG.
The position of the upper arm 72 is determined so that is closed. The opening and closing of the upper and lower heads 64 and 66 is performed in accordance with the vertical movement of the carrier 12. That is, the lift claw 94 provided on the carrier 12 abuts against the claw receiving portion 96 of the arm lifter, thereby moving the tip end portion 88 toward the front of the drawing of FIG. 1 and moving the lifter receiving portion 92 of the carriage 68.
The upper and lower heads 64 and 66 are opened. When the carrier 12 is lowered to the disk mounting position, the upper and lower heads 64 and 66 are closed by the pressing spring 82. As described above, the carrier 12 is accommodated in the cassette mounting position, the upper and lower heads 64 and 66 are also closed, and come into contact with the magnetic disk 20. Then, the carriage 68 is moved in the radial direction of the disk 20, that is, in the left-right direction in FIG. 1, so that the upper and lower heads 64 and 66 face a desired track position. The mechanism for moving the carriage 68 is a carriage driving mechanism. In the present embodiment, a step motor 98 and a gear 1 are used.
00, 102, a feed screw 104, a screw receiver 106, and the like. The output of the step motor 98 is the gear 100,
It is transmitted to the feed screw 104 via 102. Since the feed screw 104 is not directly attached to the shaft of the step motor 98, the step motor 98 and the feed screw 104
The degree of freedom in the arrangement of the elements increases. In this embodiment, the step motor 98 and the feed screw 104 are arranged in parallel,
The size in the axial direction is reduced. That is, the driving force is output from the step motor 98 to the left in FIG. 1, and the gear 100 fixed to the output shaft is rotated. Then, the gear 102 meshing with the gear 100 rotates, and the feed screw 104 coaxially fixed to the gear 102 rotates. Since the feed screw 104 is disposed on the right side of the gear 102, the output of the step motor 98 is sent out once to the left and then turned 180 degrees by the gears 100 and 102 to be sent out rightward. With this arrangement, the drive mechanism is accommodated within substantially the entire length of the feed screw 104, and the depth dimension of the disk drive device, that is, the horizontal dimension in FIG. 1 can be reduced. By the rotation of the feed screw 104, the screw receiver 106 moves in the left-right direction in the figure. The screw receiver 106 is fixed to the carriage 68, and the movement of the screw receiver 106 means the movement of the carriage 68. FIG. 1 shows a case where the carriage 68 is located substantially at the center of its movable range. A guide rail 110 is provided on the side opposite to the feed screw 104, and the carriage 6 extends along the guide rail 110.
8 moves. When the cassette is inserted, the step motor 98 moves the carriage to the retreat position, that is, the left position in the drawing. This is because the heads 64 and 66 are
This is because it is necessary to first match the outermost track of zero (zero-zero track). To detect this, a track zero / zero sensor 108 is provided. The track zero / zero sensor 108 detects the position of the carriage where the heads 64 and 66 are at the position of the zero / zero track on the disk 20. The movement of the carriage 68 is controlled based on this position. The forward / backward control is performed based on the rotation angle of the step motor 98 described above. Then, the heads 64 and 66 are moved on desired tracks to read and write necessary information. The apparatus according to the present embodiment is characterized in that when the carriage 68 is most retracted, the rear end portion substantially coincides with the rear end of the frame 10, and other components do not protrude from the rear end of the carriage. That is, by arranging the step motor 98 in parallel with the feed screw, the dimension in the axial direction is reduced, thereby realizing an arrangement in which the motor 98 does not protrude from the retracted position of the rear end of the carriage 68. Further, by providing a concave portion 70a in the carriage main body and arranging the coil portion 82a of the pressing spring 82 therein, the pressing spring 82 does not protrude at the rear end of the carriage 68. As described above, according to the present invention, the uppermost portion of the outer periphery of the coil portion of the presser spring is located below the uppermost portion of the presser portion. By being located below the upper surface of the carriage, the external dimensions of the state in which the carriage and the presser spring are integrated can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a disk drive device according to an embodiment of the present invention. FIG. 2 is a diagram for explaining insertion / removal of a cassette according to the present embodiment, and is a perspective view of a slide plate, a carrier, and a cassette. FIG. 3 is a diagram for explaining insertion / removal of a cassette according to the present embodiment, and particularly is an explanatory diagram of an engagement relationship between a groove provided on a slide plate and a frame and a protrusion provided on a carrier. FIG. 4 is a cross-sectional view of the carriage according to the embodiment. [Description of Signs] 10 frames, 12 carriers, 18 slide plates,
64 upper head, 66 lower head, 68 carriage, 7
0 carriage main body, 70a recess, 72 upper arm, 7
4 Lower arm, 82 holding spring, 82a coil part,
98 step motor, 104 lead screw, 108 track zero zero sensor.

Continuation of front page    (72) Inventor Takuo Kamiyama             6-1-12 Honcho, Tanashi-shi, Tokyo At the time of citizenship             Total in Tanashi Factory (72) Inventor Katsuhiko Fujinuma             6-1-12 Honcho, Tanashi-shi, Tokyo At the time of citizenship             Total in Tanashi Factory F-term (reference) 5D039 AA01 BA01 BB02 BC02 BC27                       CA03

Claims (1)

Claims: 1. A disk-shaped recording medium is rotationally driven by a disk drive motor, and is driven by a recording / reading head disposed on a carriage which advances and retreats in the radial direction of the recording medium by a carriage driving mechanism. A disk drive device that records or reads information on or from a recording medium, wherein the carriage includes a carriage main body including a lower arm having a lower head disposed at a front end, and a carriage main body rotatably supported by the carriage main body. An upper arm on which an upper head is arranged; and a presser spring for urging the upper arm in a direction to approach the lower arm, the presser spring extending from the coil portion and the upper arm. And a pressing portion which is in contact with the pressing portion. Together positioned below the portion located below the upper surface of the carriage, the disk drive apparatus characterized by.