JP2597577Y2 - Disk unit - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk device for recording and reproducing information on and from a disk.

[0002]

2. Description of the Related Art The above-mentioned disk device is a device for recording or reproducing information on or from a disk-shaped recording medium such as a magnetic disk or a laser disk. The disk is rotated by driving a motor, and recording or reproduction is performed while moving the head in contact with or approaching the disk. In this case, the head is usually mounted on a carriage and moved (seeked) along a radial direction of the disk by a motor.

In the above-mentioned disk device, an insertion / ejection means for mounting and discharging a disk cassette, a disk rotation driving means for rotating a disk by a motor, and a head are provided along a radial direction of the disk on a base for supporting each constituent member. Head seek means for moving to an arbitrary track position, head load means for loading and unloading a head to and from a disk, and the like are provided. Further, a control circuit for controlling the entire disk device, a connector for power supply, and the like are provided, and the control circuit is connected to a host device and the like via an interface.

[0004] Such a disk device is used as an external storage device of an electronic device such as a personal computer or a word processor, and is often incorporated in a main body of the electronic device. With the recent reduction in the price of electronic devices, cost reduction has also been strongly demanded of the above-mentioned disk devices.

In such a disk device, specifically, in a disk device using a 3.5-inch type disk cassette, when the disk cassette is positioned on the base, the disk cassette is provided integrally with or separately from the base. The disk cassette is positioned with respect to the base by engaging the two positioning pins with the two positioning holes of the disk cassette.

[0006]

However, in such a disk drive, when a positioning pin is provided, the base must be manufactured by die-casting or the like in order to integrate the positioning pins. It costs money, and all are disadvantageous in terms of cost.

The present invention has been made in view of such technical problems, and an object of the present invention is to provide a low-cost disk device capable of positioning a disk cassette with a simple configuration. It is.

[0008]

SUMMARY OF THE INVENTION In order to solve the above problems and to achieve the above object, the present invention relates to a positioning method in which a positioning member provided on a base is engaged with a positioning hole provided in a disk cassette. In the disk device, the positioning member is formed by cutting and raising the base, and the cut and raised portion has a surface formed along only the insertion direction of the disk cassette, and the positioning of the disk cassette. It is configured to have a convex portion that fits into the hole and a positioning surface.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the same reference numerals indicate the same or corresponding parts. 1 to 5
FIG. 1 is a diagram showing an embodiment of a disk drive to which the present invention is applied, FIG. 1 is a plan view showing an internal configuration at the time of unloading with a cover omitted, and FIG. 2 is a diagram showing an internal configuration at the time of loading of FIG. FIG. 3 is a plan view, FIG. 3 is a front view taken along line 3-3 in FIG.
FIG. 4 is a rear view as viewed from line 4-4 in FIG. 2. FIG. 5 is FIG.
It is the longitudinal cross-sectional view seen from line 5-5 in the inside.

In a box-shaped base 10 having an open top,
As shown in FIGS. 1 and 2, each component is stored. The base 10 is formed of a thin metal body such as aluminum, for example, and its upper surface is provided with a cover (not shown) made of a thin plate of nonmagnetic material such as aluminum for magnetic shielding and dust prevention. Covered. As shown in FIG. 3, a front panel 13 having a cassette insertion opening 13a for inserting and ejecting the disk cassette 11 is attached to the front surface of the base 10. 5 and 6, at the front end of the base 10, there are provided rotating shafts 12a, 12b integrally formed with the shutter 12 in order to prevent dust or the like from entering from the cassette insertion slot 13a. By being rotatably supported by the base 10, it is rotatably attached. The shutter 12 is constantly urged clockwise (clockwise) by a shutter spring 93 attached to the rotating shaft 12a of the shutter 12, and the disc cassette 1
When the disc cassette 11 is inserted, the disc cassette 11 is rotated in a counterclockwise (left-handed) direction.

FIG. 6 shows a front panel 13 shown in FIG.
FIG. 3 is a detailed view around the shutter 12 in which is omitted. When the disk cassette 11 is inserted, the rotating shaft 12
In order to prevent the rotating shafts 12a, 12b from being deformed or destroyed when the disk cassette 11 is strongly pressed in the vicinity of the a and 12b, as shown in FIG.
A stopper 36a is provided by cutting and raising a part of the rotary shaft 12. Even if the rotating shaft 12a is deformed, the stopper 36a
a and does not cause permanent deformation. In this embodiment, the stopper 36a is provided only near the rotating shaft 12a, but may be provided near both the rotating shafts 12a and 12b.

At the left end of the front panel 13, a push button (eject button) 14 which is operated when the loaded disk cassette 11 is ejected is provided.

1 and 2, a base 10 has a disk cassette 11 inserted, ejected, and loaded.
A cassette guide 15 for guiding unloading is held movably up and down and back and forth. The cassette guide 15 is provided for the disc cassette 1 inserted from the front.
1 has a cross-sectional shape for guiding and holding, and in the illustrated example, a notch 16
Is provided. As shown in FIG. 7, the cassette guide 15 has at least one projection 15a at the innermost part in the insertion direction on the guide rail 15c of the cassette guide 15 on the side where the space is formed. The protrusion 15a has a play of about 0.2 between the upper surface of the disk cassette and the lower surface of the cassette guide 15 at the protrusion 15a when the disk cassette 11 is inserted.
It is set to about mm. As shown in FIG. 8, at least one protrusion 15d is provided at the innermost part in the insertion direction on the side surface of the guide rail 15b on the right side of the cassette guide 15. The protrusion amount of the projection 15d is set to about 0.2 mm, and the play between the inner width of the cassette guide 15 and the width of the disk cassette 11 is set to about 0.2 mm.
The projections 15a and 15d are simultaneously formed when the cassette guide 15 is pressed. Further, the cassette guide 15 is mounted at a position shifted to the right side (rightward shift position) with respect to the base 10, and a space for disposing other components is formed on the left side of the base 10. ing.

In FIG. 1 and FIG. 2, the area of the notch 16 of the cassette guide 15 is
1 is provided with a head seek mechanism 18 having a head 17 for recording or reproducing information on or from a disk (information medium) in the disk drive 1. This head seek mechanism 18
Is a mechanism for moving (seeking) the head 17 to an arbitrary track position along the radial direction of the disk.
Since the head seek mechanism 18 is provided with components constituting the head seek mechanism in a direction perpendicular to the seek direction, the amount of the head seek mechanism 18 protruding outward from the outer shape of the disk cassette 11 during seeking is small. The miniaturization of the corner device has been attempted.

A disk 11a serving as an information medium (media) housed in the disk cassette 11
The magnetic disk or the like can be accessed from the outside by opening the slidable shutter 19 provided in the disk cassette to load the head 17 from the head receiving opening.

In FIG. 1 and FIG. 2, a vertical shaft 20a provided at the center of the left side of the cassette guide 15 so as to protrude cylindrically from the cassette guide 15 and is provided integrally therewith has:
On the upper side of the cassette guide 15, a shutter lever 21 that can swing around the shaft is supported. In addition, a vertical shaft 20b provided at the right rear portion of the cassette guide 15 so as to protrude cylindrically from the cassette guide 15 and is provided integrally therewith has:
Above the cassette guide 15, a latch lever 22 that can swing around the shaft is supported. The shutter lever 21 is for opening and closing the shutter 19 in the head receiving opening of the disk cassette 11 in conjunction with the insertion of the disk cassette 11. A pin 23 is provided which can abut on the edge of the shutter 19 while being in contact with the shutter 19. The shutter lever 21 is urged in a clockwise (clockwise) direction in the figure by a spring 25 stretched between the shutter lever 21 and the cassette guide 15. Further, a groove 26 having a predetermined length is formed on the upper surface of the cassette guide 15 along the movement locus of the pin 23 so as to allow the pin 23 to move.

1 and 2, the latch lever 22 is urged by a latch spring 27 in a counterclockwise (left-handed) direction in the figure, and in an unloaded state, as shown in FIG. The latch portion is in a latched state because the engagement portion 29 provided at one end of the lever 22 is engaged with a stopper 28a formed on the base 10.
Further, as shown in FIG. 14, the engaging portion 29 is formed with a concave portion 29a which can be engaged with the corner portion 28c of the stopper 28. The position 28c corresponds to the position where the cassette guide 15 is completely raised. Further, a movement restricting portion 29 larger than the outer shape of the engaging portion 29 is provided on the top of the engaging portion 29.
b is provided. The other end of the latch lever 22 is provided with a pin 30 with which the leading end of the disc cassette 11 to be inserted can abut. In this manner, the space opposite to the notch 16 of the cassette guide 15, that is, the side where the head seek mechanism 18 and a cassette loading mechanism 33 described below are disposed (a space is formed by moving the cassette guide 15 and the disk cassette 11 together). The latch mechanism 22 is disposed on the opposite side of the latch mechanism 22.

FIG. 9 is a view showing the mounting parts on the bottom surface of the base 10 after removing the cassette loading mechanism and the head seek mechanism, etc.
(B) is a front view as viewed from line BB in (A), (C) is a side view as viewed from line CC in (A), and (D) is a line D- in (A). It is the longitudinal cross-sectional view seen from D. In FIG. 9, a disk-shaped flat motor 31 for driving a disk is mounted substantially at the center of the bottom surface of the base 10. The motor 31 has a central hole (not shown) of the disk cassette 11 and A center shaft 81 to be fitted, a drive pin 82 to be engaged with a drive hole (not shown) provided near the center hole of the disk cassette 11, and a magnet 83 for holding a disk hub by suction are provided. I have. A positioning projection 84a formed by cutting and raising a part of the base 10 for positioning the disc cassette 11 in the loading state is formed on the left rear side of the motor 31. A partially cut and raised positioning surface 84b is formed. The positioning projection 84a is provided in the disk cassette 11 as shown in FIG.
And a positioning surface 84d of the disk cassette 11 are formed.
Further, a positioning surface 85 formed by cutting and raising a part of the base 10 is provided near the cassette insertion slot 13a (FIG. 3). A circuit board 32 for controlling the disk device is joined to the periphery of the motor 31.

As shown in FIG. 9A, the circuit board 32 is sandwiched between one or a plurality of raised portions 10a formed by cutting and raising a part of the base 10 and an upper surface of the base 10 to fix the base. By fixing with one screw 99,
The assembling is simplified. Further, as shown in FIG. 4, an interface connector 32a for connection to an external electronic device provided on the circuit board 32 is provided.
To prevent the circuit board 32 from rising from the base 10 by inserting and removing the interface cable,
0 is interposed between the rear wall protrusion 10b and the upper surface.

1 and 2, a cassette loading mechanism 33 for moving the cassette guide 15 to a load position and an unload position is provided in a space formed on the left side of the cassette guide 15 in the base 10.
Are arranged. An operating lever 34 extending across the upper side of the cassette guide 15 and pivotally supported at both ends by the base 10 is mounted on the base 10. Button lever 3 of the loading mechanism 33
6 is constantly urged in the direction of the insertion opening 13a by the return spring 35, and is movable rearward against the return spring 35 by pressing the eject button 14. The swing position of the operation lever 34 is regulated by the button lever 36, and the swing position drives the cassette guide 15 to the load position and the unload position.

The operating lever 34 and the cassette guide 15
The cassette guide 15 is constantly biased in the discharge direction.

FIGS. 10 to 13 are partial side views showing the unloading state and the loading state of the cassette loading mechanism 33. FIG. 10 shows the state of the button lever 36 at the time of unloading, and FIG. Operation lever 34 and cassette guide 15, FIG. 12 button lever 36 during loading, FIG. 13 loading lever 34 during loading
And the state of the cassette guide 15. The button lever 36 is supported so as to be slidable in the front-rear direction with respect to the base 10 by an engagement portion 10d formed by cutting and raising a part of the base 10 and a sliding guide portion including a long hole 36a. 35, it is constantly urged leftward (forward) in the figure. The operation lever 34 is pivotally supported at both ends thereof so as to be able to swing about a fulcrum 37 provided on the base 10. Therefore, a notch 38 formed in the button lever 36 and a projection 39 provided on one side of the operation lever 34 are engaged.

The cam groove 4 is provided on both sides of the operating lever 34.
0 is formed, and stepped holding portions 41 are provided on both sides of the base 10. On the other hand, the cassette guide 15
The center pin 42 slidably engaged with the cam groove 40 of the operating lever 34 and the holding portion 41 of the base 10
The roller portion 43 is provided in contact with the roller portion 43. Since the cassette guide 15 has a cut-out shape in the left half portion as shown in FIGS. 1 and 2, the holding portion 41 and the roller portion 43 have a total of one portion on the left side and two portions on the right and left sides. It is provided in three places. A mountain-shaped projection 41d is provided at the rear end (on the lower vertical portion 41c side) of the two horizontal portions 41b on the left and right front sides of the holding portion 41. The protrusion 41d is composed of a horizontal portion 41b and a lower vertical portion 41.
It is connected to c by a smooth R, and the height of the apex of the projection 41d is set to 0.1 mm to 0.2 mm.

Next, the operation of each unit when loading and unloading the disk cassette 11 will be described with reference to FIGS. Cassette insertion slot 1
When the disk cassette 11 is inserted from the position 2 (FIG. 3), the disk cassette 11 moves on the rail portion of the cassette guide 15 and rides on the projection 15a on the rail portion 15c on the left side in FIG. In order to raise, the disk cassette 11 moves with the left side slightly lifted. When the disc cassette 11 is further inserted, the left rail 15c of the cassette guide 15 is interrupted. For this reason, a force for the disk cassette 11 to rise upward acts near the cassette guide insertion opening, but is blocked by the lower surface of the cassette guide 15. 1 has a sufficient guide length, and as a result, the disc cassette 11 is inserted while being kept substantially parallel, so that the tip of the disc cassette 11 contacts the lower head 17b and damages the head. Never. Next, the tip of the disk cassette 11 contacts the pin 23 of the shutter lever 21 (FIGS. 1 and 2), and the shutter lever 21
It rotates in the counterclockwise (left-handed) direction inside. At this time, the pin 23 (FIGS. 1 and 2) of the shutter lever 21 comes into contact with the edge of the shutter 19 of the disk cassette 11, and the rotation of the shutter lever 21 (insertion of the disk cassette 11).
By moving the shutter 19 against a return spring (not shown), the head receiving opening is opened, and the head 17 can access the disk 11a (media).

Next, when the leading end of the disk cassette 11 contacts the pin 30 of the latch lever 22 (FIGS. 1 and 2) and further presses the disk cassette 11 (in the insertion direction), the latch lever 22 resists the latch spring 27. And rotate in the clockwise (clockwise) direction in the figure to
Is disengaged from the stopper 28 of the base 10. By releasing the latch, the cassette guide 15 restrained by the engaging portion 29 is moved rearward of the apparatus (FIG. 1).
(To the right in 0). The position of the disc cassette 11 in the forward direction in the cassette guide 15 is regulated by the pin 23, the leading end of which contacts the rear end of the groove 26 (FIG. 2).

When the disc cassette 11 is further pushed, the cassette guide 15 also moves to the rear of the apparatus. Therefore, the center pin 42 of the cassette guide 15 (FIG. 1)
1, 13) horizontally moves the cam groove 40 of the operating lever 34 to the right (in the rear of the apparatus) in the figure, and the return spring 35
Of the operating lever 3 via the button lever 36.
The actuation lever 34 is rotated by acting on the convex portion 39 of 4, and the operation lever 34 rotates clockwise (clockwise) from the position shown in FIG. At the same time, the roller portions 43 (three places) of the cassette guide 15 also move rearward along the horizontal portion 41b of the holding portion 41. Since the pin 39 moves to the left in the drawing by the rotation of the operation lever 34, the button lever 36 also moves in conjunction with it.

Further, when the disc cassette 11 is pushed,
The roller portion 43 of the cassette guide 15 against the urging force of the spring 87 descends so as to move over the two left and right front protrusions 41d of the stepped holding portion 41 and move along the lower vertical portion 41c. The cassette guide 15 is shown in FIG.
A cassette loading state (a state in which the disk cassette 11 is at the loading position) shown in FIG. At this time, FIG.
As shown in (b), the stopper 2 on the base 10
8 and movement restricting portion 2 of engaging portion 29 of latch lever 22
9b is in a contact state, and the downward movement of the engaging portion 29 is restricted. Therefore, the engaging portion 29 is connected to the stopper 2
There is no such thing as sinking under 8.
Further, since the movement restricting portion 29b has a shape larger than the outer shape of the engaging portion 29, it prevents the engaging portion 29 from getting under the stopper 28 regardless of the contact position between the engaging portion 29 and the stopper 28. .

In the loading state in which the cassette guide 15 is lowered, the cassette guide 15 is brought into contact with the roller 43 of the cassette guide 15 and the lower holding surface (vertical surface) 41c of the holding portion 41 of the base 10. The front and rear position of is regulated. In this loading state, the disc cassette 11 is positioned in the mounted state by the positioning projections 84a and the positioning surfaces 84b and 85. The cassette guide 15 is moved by the downward urging force of the operating lever 34. It is urged downward. Therefore, the plurality of disk cassette pressing projections 86 (FIGS. 1 and 2) provided on the cassette guide 15 press the upper surface of the disk cassette 11 to be positioned, so that the loading position of the cassette guide 15 is changed. Be regulated. At this time, as shown in FIG. 15, the disc cassette 11 in the cassette guide 15 has only one positioning projection 84a provided on the base 10 in the positioning hole 11 provided in the disc cassette 11.
b, it is positioned with respect to the base 10 and is in contact with the semi-cylindrical protrusion 30 of the latch lever 22 provided on the cassette guide 15; Due to the urging force of the latch spring 27, a clockwise (clockwise) rotating force is applied inside the cassette guide 11, and the cassette guide 15 and the disc cassette 11 tend to tilt within the range of rattling.
The inclination is limited by the protrusion 15d provided on the side surface of the rail 15b of the cassette guide 15. Thus, the loading position of the disk cassette 11 in the cassette guide 15 is regulated. When the cassette guide 15 is at the load position, the disk (specifically, the hub portion) in the disk cassette 11 is magnetically attracted onto the rotor of the disk drive motor 31 (FIG. 9), and By engaging with the center shaft 81 and the drive pin 82, positioning (height direction, rotation direction) of the disk (media) is performed. That is, the disc is set to a loading state in which information can be recorded and reproduced on the disc.

Next, the ejection of the disk cassette 11 will be described. When ejecting the disc cassette 11 set in the disc device, the eject button 14
(FIGS. 3 and 12), the button lever 36 is moved backward against the return spring 35. When the button lever 36 moves backward, first, the notch 38
13 and the convex portion 39 of the operating lever 34, the operating lever 34 rotates counterclockwise (leftward) from the position shown in FIG. Next, the center pin 42 is lifted by the cam groove 40, and the cassette guide 1 is moved.
5 moves upward. Further, when the eject button 14 is pressed, the roller portion 43 is disengaged from the lower holding portion (vertical portion) 41c due to the rise of the cassette guide 15, and the protrusion 41
d), the cassette guide 15 is moved forward of the apparatus (FIG. 1).
3 (to the left in FIG. 3) due to the urging force of the spring 87.

When the operator stops pressing the eject button 14 during the ejecting operation or weakens the pressing force, the center of the roller 43 does not pass through the vertex of the protrusion 41d. The roller 43 is a projection 41d.
And the operating lever 34 is returned to the loading state again by the downward biasing force. When the center of the roller 43 is at the vertex of the protrusion 41d, the roller 43 moves forward over the protrusion 41d by the urging force of the spring 87. Is reliably performed.

When the cassette guide 15 moves, the engaging portion 29 of the latch lever 22 also moves along the side surface 28b of the stopper 28.

Further, when the eject button 14 is pressed,
The shutter lever 21 and the latch lever 22 are vigorously rotated clockwise (clockwise) and counterclockwise (counterclockwise) by the urging forces of the return springs 25 and 27 (FIGS. 1 and 2), respectively. The cassette guide 15 is moved forward while ejecting (ejecting) the cassette 11 forward.

FIG. 16 is a vertical sectional view of the head seek mechanism 18 taken along the line 10-10 in FIG. On the notch 16 side of the cassette guide 15, there is a bar 61 for head lift (unloading of the head) extending through the lower side of the head arm 57, and a holder 90 is attached to one end of the bar 61. The end is fixed and attached to the cassette guide 15. The bar 61 is configured such that the bottom 90b of the holder 90 is engaged with the base 10 when the head is unloaded, as shown in FIG. 17B. The holder 90 has a base 10 on the side surface of the holder 90 when the head is unloaded.
An elastic portion 90a is formed so as to easily engage with the elastic member. Further, the bottom portion 90b may be engaged with a member other than the base 10 at the time of unloading.

With the above configuration, when the cassette guide 15 is unloaded to move upward, the head arm 57 is raised to the raised position as shown in FIG.
The upper head 17A is held at the unload position. At this time, the bar 61 supports the head arm 57 substantially at the center between the fixed point and the holding point of the head 17A.

Further, as shown in FIG. 16, a screw 95 made of a material having a small sliding resistance is disposed substantially at the center of the portion of the head arm 57 which contacts the bar 61. The screw 95 is provided so as to protrude from a surface of the head arm 57 facing the bar 61.
And the bar 61 are not in direct contact with each other. That is, in the unloaded state, the head arm 57 is held by the bar 61 via the screw 95. A groove 95a for engaging a tool such as a screwdriver is provided on the surface of the screw 95 opposite to the surface in contact with the bar 61, and a tool such as a screwdriver is engaged with the groove 95a. Screw 9
By rotating the head 5, the head arm 57 in the unloaded state can be moved up and down. That is, the position of the upper head 17A in the unloaded state can be adjusted.

Further, the movement of the holder 90 when the head shifts to the unload state will be described in detail. As described above, the cassette guide 15 moves upward,
The bar 61 also moves upward and toward the base 10 in FIG. Immediately before shifting to the state of FIG. 17B, the holder 90 contacts the side wall of the base 10,
Although this hinders the movement of the holder 90, the movement of the bar 61 causes the elastic portion 90a of the holder 90 to bend and form a slanted surface, whereby smooth movement can be achieved.

In the above-described discharging operation, if FIG.
As shown in FIG. 8, the cassette guide 15 is fully raised even when the operator presses the eject button and the button 14 with the operator's finger hooked on the insertion opening 12, that is, the engaging portion 29 of the latch lever 22 is Front part 28 of 28
The projecting length of the eject button 14 is set to be long enough not to touch the end face of the disc cassette 11 with respect to the projecting amount of the disc cassette 11 from the insertion opening 12 in the state where the disc cassette 11 is engaged with the disc cassette 11.

Even if the operator's finger hits the end face of the disc cassette 11 to stop the ejection of the disc cassette 11, as shown in FIG. Stopper 28
With the corner portion 28c of the second member.

Further, the shutter lever 21 is connected to the groove 2
6 and return, the pin 23 of the shutter lever 21 comes into contact with the front end of the groove 26 to apply a return force to the cassette guide 15. Thus, first, the cassette guide 15 is returned to the initial position in FIG. Then, when the pressing of the eject button 14 is stopped, the return spring 35 (FIG. 10, FIG.
By the biasing force of FIG. 12), the button lever 36 and the operating lever 34 are returned to the initial position (unload position) shown in FIGS.

As described above, the disk device of this embodiment is configured so that the upper head 17A and the lower head 17B can be simultaneously loaded on the upper and lower surfaces of the medium (disk) in the disk cassette 11. Have been. FIG. 16 shows a state where the cassette guide 15 and the heads 17A and 17B are at the unload position. In this state, the upper surface (highest portion) of the cassette guide 15 and the upper surface (highest portion) of the head arm 57 are shown.
Are arranged so as to have substantially the same height, that is, to be substantially coplanar. In the present embodiment, FIG.
As shown in FIG. 6, the distance between the upper surface of the cassette guide 15 and the cover 63 (FIG. 16) covering the open upper surface of the base 10 in this unloaded state is set as small as possible. The height (thickness) of the disk device is made as small as possible by making light contact. Note that a projection 57 a is provided at the tip of the head arm 57 to reduce the sliding resistance with the cover 63.

As shown in FIGS. 1 and 2, a head seek mechanism 18 as shown in FIG. 16 is arranged in the area of the notch 16 of the cassette guide 15. Next, the head seek mechanism will be described with reference to these drawings.
In the illustrated example, the notch 16 is provided on the left side of the rear half of the cassette guide 15 over a substantially quarter area. However, in some cases, the corresponding notch is provided on the right side of the rear half. In that case, a mechanism corresponding to the head seek mechanism 18 is also provided in the cutout area on the right side.

In FIG. 1 and FIG.
6 or the like, that is, near the side edge in the space (left side in the illustrated example) formed by moving the cassette guide 15 to one side (the right side in the illustrated example). The cassette loading mechanism 33 and the head seek mechanism 18 are arranged along the side edge of the disk cassette 11 in the insertion direction of the disk cassette 11.

The head seek mechanism 18 includes a head driving motor (step motor) 51 fixed to the rear wall of the base 10 and a driving shaft 53 composed of a lead screw rotated by the motor 51 via a belt 52. ,
A head carriage 54 that engages with the lead groove of the drive shaft 53 and can reciprocate by forward and reverse rotation of the drive shaft 53; a guide bar 55 that fits with the head carriage 54 and guides the head carriage 54; A lower head 17B mounted on the distal end of the head carriage 54; a head arm 57 movably mounted on the head carriage 54 via a leaf spring 56; and a head arm 57 mounted on the distal end of the head arm 57. And a head loading spring 58 for urging the head arm 57 downward (toward the head loading position). The upper head 17A is fixed to the head arm 57 on the upper surface side with an adhesive 104 as shown in FIG. 1 in order to reduce the thickness of the apparatus.

FIG. 20 is a partial longitudinal sectional view showing a front end bearing structure of the drive shaft 53. In the figure, the drive shaft 53
Is a vertical portion 10 formed by cutting and raising the base 10
The bearing is supported by a slide bearing 68 fitted in c. Further, a sun ball 70a is in contact with a bearing seat surface formed on the distal end surface of the drive shaft 53, and the sun ball 70a is constantly urged rearward by a leaf spring 69 fixed to the base 10. .

FIG. 21 is a partial longitudinal sectional view showing a rear end bearing structure of the drive shaft 53. As shown in FIG. In the figure, a pulley 66 to which the rotational force from the motor 51 is transmitted via the belt 52 is fixed to a support shaft portion 65 of the drive shaft 53. The support shaft portion 65 of the drive shaft 53 includes a pulley 66
It projects further rearward, and this projecting portion is
0 extends into a rotary bearing 67 fixed to the rear wall.
The sun ball 70b abuts on a bearing seat surface formed on the distal end surface of the support shaft portion 65, while a plurality (for example, 3) that abuts on the sun ball 70b as shown in the bearing.
(6 pieces) of planetary balls 71 are provided. These planetary balls 71 have a casing 72 surrounding them.
The rotary bearing 67 supports both the radial load and the thrust load of the drive shaft 53 by being held by the
Is configured.

Next, the driving mechanism of the head carriage 54 will be described in detail with reference to FIGS.

The head carriage 54 (the lower carriage 5)
4b) shows the drive shaft, that is, the lead groove 53 of the drive shaft 53.
The two engaging pins 101a and 101b which are always engaged with the a are fixed integrally (a separate member may be fixed), and are fixed to the head carriage 54 with the drive shaft 53 therebetween by the coil spring 102. The pressing member 103 fitted in a state where the urging force is always applied in the direction of the drive shaft 53 is pressed against the lead groove 53a and the engaged state is maintained.

With such a structure, FIG.
As shown in (1), even if there is a loose fit δ between the head carriage 54 and the guide bar 55 for guiding the same, it is possible to prevent the head from shifting inward regardless of the attitude of the apparatus.

That is, the engagement pin 101a and the lead groove 5
The engagement point of 3a is Q, one inclination point due to the looseness δ between the head carriage 54 and the guide bar 55 is R ', an imaginary line connecting these points is L', the engagement pin 101b and the lead groove 53a. Let P be the engagement point of the head, R be the other inclination point due to the play δ between the head carriage 54 and the guide bar 55, and L be the imaginary line connecting these points. Even if an inclination force is applied to the guide bar 55 and the imaginary line O is inclined about the imaginary intersection O 'of the imaginary lines L and L', the lead groove 53a is formed.
Since the two engaging pins 101a and 101b are fitted into the head carriage 54, the amount of inclination of the head carriage 54 can be extremely small, and the head position can be kept high regardless of the posture of the apparatus without causing a head position shift. Accuracy can be obtained.

With the above configuration, the head 17 is
A flexible printed circuit board for transmitting an electric signal for recording information to and from the disk 11a to a control circuit for controlling the recording and reproduction of information of the disk device and the head. FPC94
Is the disk 11a from the head 17 as shown in FIG.
At the same time, it is bent inside the rear wall of the base 10 to make a U-turn, and is connected to the connector 32b on the circuit board 32 disposed above the base 10. In the present embodiment, the device is made thinner in addition to the size reduction.
Since the gap between the disk cassette 11 and the circuit board 32 is small, the FPC that has come out of the so-called
94B is the disk cassette 11 due to bulging due to bending.
Contact with the shutter 19 of FIG. Then, the head seek device 18 is moved in a state where the FPC 94B is in contact with the shutter 19.
In order to prevent the FPC from rubbing against the shutter 19 and being worn when seeking, the shutter 1 of the FPC 94B is used.
9 is coated with a thin grease made of a component that does not chemically affect the surface of the FPC 94B.

Further, the output of the motor 51 is
25, when transmitting to the drive shaft 53, as shown in FIG. 25, a spring 105 is interposed between a pulley 100 fixed to an output shaft 51a of the motor 51, and a gap between the motor 51 and the output shaft 51a is formed. Is configured to eliminate backlash in the axial direction. By adopting such a configuration, it is possible to prevent the vibration caused by the backlash in the axial direction and the step driving of the motor 51 and the noise due to the vibration. Also,
Since the position of the pulley 100 is stabilized by the pressing force of the spring 105, the position of the pulley 100 does not change back and forth in the axial direction of the pulley 100 due to backlash in the axial direction and forward and reverse rotation of the motor 51. Therefore, the engagement state of the belt 52 with the pulley 100 is stabilized, and the belt 52 does not come off the pulley 100.
The output of the motor 51 may be transmitted to the drive shaft 53 through a gear train.

Next, a track position adjusting method will be described with reference to FIGS. The drive motor 51
As shown in FIG. 4, a flange 51a for fixing the motor 51 and the circuit board 32 and the motor 5 are provided.
A terminal portion 51b to which a flexible printed circuit board (FPC) 99 for electrically connecting the motor 51 to the terminal 1 is soldered is provided so as to protrude beyond the outer shape of the motor 51. The motor 51 is rotatably fixed by a mounting plate 106 fixed to the rear wall of the base 10 via a flange portion 51a. The track position adjustment for adjusting the reference position of the head 17 in the seek direction is performed by changing the fixed angular position of the motor 51. In this embodiment, the outer size of the motor 51 and the height of the disk device are made substantially the same in order to enhance the seek performance of the seek mechanism 18 while reducing the thickness and size of the disk device. Therefore, when the track position is adjusted by changing the mounting angle of the motor 51, the flange 51b and the terminal portion 51c must be prevented from protruding from the thickness direction of the disk device. Is getting narrower. That is, the adjustable range of the track position is narrowed.

For the above-described reasons, the accuracy of assembling each component is improved so that the track position can be adjusted within a narrow track position adjustment range. That is, the lower head 17B is positioned and fixed at a predetermined position with respect to one of the engaging pins 101a and 101b provided on the head carriage 54. The pulley 66 fixed to the drive shaft 53 is provided with a reference surface 66a.
When 7B is at a predetermined track position, the engagement pin 101
a and 101b are engaged with the lead groove 53a of the drive shaft 53, the reference surface 66
a so that a is at a predetermined angle.
Has been fixed. Also, the output shaft 5 of the motor 51
The reference surface 100a is also provided on the pulley 100 fixed to 1a. When the motor 51 is excited to a predetermined excitation phase, the reference surface 100a is at a predetermined angle with respect to the terminal portion 51b of the motor 51. Pulley 1
00 is fixed. Further, the belt 52 for transmitting power between the pulley 66 and the pulley 100
Is mounted such that the reference surface 66a of the pulley 66 and the reference surface 100a of the pulley 100 maintain a predetermined positional relationship.

The FPC 99 is connected to the motor 5
The length is set to be able to absorb the change in the position of the terminal due to the mounting angle of 1 and as shown in FIG.
A protrusion 99 a is provided on a part of the base 99, and the protrusion 99 a is sandwiched between the upper surface of the rear wall of the base 10 and the cover 63 to suppress the floating of the FPC 99.

According to the embodiment described above, in a disk device for rotating a disk as a recording medium and recording or reproducing information on or from the disk,
Since a part of the base 10 is cut and raised to form the positioning projection 84a and the positioning surface 84b for positioning the disk cassette 11 in the loading state, the disk cassette can be positioned with a simple configuration. Thus, a low-cost disk device can be provided.

[0056]

As is apparent from the above description, according to the present invention, a disk cassette can be positioned with a simple configuration, and a disk device with low cost can be provided.

[Brief description of the drawings]

FIG. 1 is a plan view showing an unloaded state of a disk device according to an embodiment of the present invention, with a cover removed.

FIG. 2 is a plan view showing a state where the disk device of FIG. 1 is loaded, with a cover removed.

FIG. 3 is a front view taken along line 3-3 in FIG. 2;

FIG. 4 is a rear view taken along line 4-4 in FIG. 2;

FIG. 5 is a longitudinal sectional view taken along line 5-5 in FIG. 1;

FIG. 6 is a partial plan view around a shutter in which a front panel in FIG. 1 is omitted.

FIG. 7 is a cross-sectional view of the cassette guide of the present embodiment.

FIG. 8 is a front view of the cassette guide of the present embodiment.

9A and 9B are diagrams showing a configuration on the bottom surface of the base of the disk device of FIG. 1, wherein FIG. 9A is a plan view, FIG. 9B is a front view as viewed from line BB in FIG. () Is a side view as seen from line CC in (A), and (D) is a longitudinal sectional view as seen from line DD in (A).

FIG. 10 is a partial side view showing a state when the button lever in FIG. 1 is unloaded.

11 is a partial side view showing a state when the operation lever and the cassette guide in FIG. 1 are unloaded.

FIG. 12 is a partial side view showing a state when the button lever in FIG. 2 is loaded.

FIG. 13 is a partial side view showing a state when the operation lever and the cassette guide in FIG. 2 are loaded.

FIGS. 14A and 14B are enlarged views of a main part of the present embodiment, in which FIG. 14A shows an unloaded state of the cassette guide, and FIG. 14B shows a loaded state.

FIG. 15 is an explanatory diagram of a disk cassette positioning state in FIG. 2;

FIG. 16 is a longitudinal sectional view of a portion of the head seek mechanism taken along line 10-10 in FIG. 1;

17A and 17B are enlarged views of a main part of the embodiment, in which FIG. 17A shows a state in which a bar for unloading a head arm is moving, and FIG. It shows the state where it is.

FIG. 18 is a diagram showing the state of the finger pressing the eject button and the state of the disc cassette during ejection in the embodiment.

FIG. 19 is a diagram illustrating a relationship between a stopper and an engaging portion in the present embodiment.

FIG. 20 is a partial cross-sectional view of a drive shaft front end in the present embodiment.

FIG. 21 is a partial sectional view of a rear end of a drive shaft in the present embodiment.

FIG. 22 is a cross-sectional view illustrating a main part of a head seek mechanism according to the present embodiment.

FIG. 23 is a plan view illustrating a main part of a head seek mechanism according to the present embodiment.

FIG. 24 is a side view showing details around the head seek mechanism as seen from the direction of arrow A in FIG. 2;

FIG. 25 is an enlarged explanatory diagram of a main part of the present embodiment.

FIG. 26 is an enlarged explanatory view of a main part as viewed from the direction of arrow B in FIG. 2;

FIG. 27 is an enlarged explanatory view of a main part showing the vicinity of a drive motor according to the present embodiment.

[Explanation of symbols]

 Reference Signs List 10 base 11 disk cassette 14 eject button 15 cassette guide 16 notch (cassette guide) 17A upper head 17B lower head 18 head seek mechanism 31 motor for driving disk 33 cassette loading mechanism 51 motor 53 for driving head Shaft (lead screw) 54 Head carriage 55 Guide bar 57 Head arm 58 Spring (for biasing head arm) 61 Bar (for lifting head arm) 90 Holder

Claims (1)

(57) [Scope of request for utility model registration] 1. A disk device for positioning by engaging a positioning member provided on a base with a positioning hole provided in a disk cassette, wherein the positioning member is formed by cutting and raising the base. The cut-and-raised portion has a surface formed only along the insertion direction of the disk cassette, and has a projection and a positioning surface that fit into the positioning holes of the disk cassette. apparatus.