JP2001028173A - Disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent first and second heads for recording/reproducing from colliding with each other even when external impacts are applied to a disk device to record/reproduce information on a floppy (registered trade mark) disk or the like. SOLUTION: This device is provided with a holder 4 moved between a jacket loading/unloading position and a recording/reproducing position while holding a jacket 1 housing a disk, first and second carriages 66, 70 movable in a disk diameter direction, and first second heads for recording/reproducing, mounted on the carriages 60 and 70, or the like. The holder 4 is provided with a regulating means abutted on the second carriage 70 to regulate its movement when a head mounting part for mounting the second head of the second carriage 70 is moved in the direction of approaching the first carriage in the jacket loading/unloading position, and this regulating means is moved from a regulating position to a non-regulating position by the insertion of the jacket 1 into the holder 4.

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 or reproducing information on a floppy disk or the like.
More specifically, the present invention relates to an improvement of a head loading mechanism in the above disk device.

[0002]

2. Description of the Related Art A head loading mechanism in a disk drive as described above generally includes a holder for holding a jacket containing a disk and moving between a jacket insertion / removal position and a recording / reproducing position, and a diameter of the disk. A first carriage and a second carriage movable in the first direction and the first carriage;
A first head and a second head mounted on the carriage and the second carriage, respectively, for recording or reproducing a signal with respect to the disk; and a first head and a second head on both sides of the disk during recording and reproduction. The two heads are brought into contact with each other to record information on the disk or to reproduce the recorded information. When the jacket is inserted or removed, the first head and the second head are moved away from each other to insert or remove the jacket. This is a configuration that allows operation.

[0003]

However, when one of the carriages moves in a direction approaching the other carriage due to an external shock applied to the disk drive, the two heads may collide with each other and be damaged. .

[0004] The present invention has been proposed in view of the above problems, and has as its object to provide a disk device capable of reliably preventing the collision between the two heads even when the above-described impact is applied. I do.

[0005]

To achieve the above object, a disk drive according to the present invention has the following arrangement.

That is, a holder for holding a jacket containing a disk and moving between a jacket insertion / removal position and a recording / reproducing position, a first carriage and a second carriage movable in a radial direction of the disk, A first head and a second head are mounted on the first carriage and the second carriage, respectively, for recording or reproducing signals on or from the disk. The second carriage includes the second carriage. A lifting portion is provided for rotating the holder in accordance with a movement operation between a jacket insertion / removal position and a recording / reproducing position. In a disk device which is held so as to be rotatable between a reproducing position and the second position of the second carriage,
When the head mounting portion for mounting the head moves in a direction approaching the first carriage at the jacket insertion / removal position, the head mounting portion abuts on the second carriage and regulates the movement, and abuts on the second carriage. A regulating means is provided which is movable to an unregulated position which does not regulate the movement without the movement, and the regulating means moves from the regulated position to the unregulated position by an operation of inserting the jacket into the holder. It is characterized by having such a configuration.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A disk drive according to the present invention will be specifically described below based on an embodiment shown in the drawings.

FIGS. 1 and 2 are exploded perspective views showing one embodiment of a disk drive according to the present invention. In FIG. 1, reference numeral 1 denotes a jacket (cartridge) containing a disk (not shown). The jacket 1 is inserted into a holder 4 while pressing a bezel shutter 3 from an opening 2a of a front bezel 2.

The holder 4 is selected between a jacket insertion / removal position for loading / unloading the jacket 1 in / from the holder 4 and a recording / reproduction position for recording / reproducing desired information on / from the disc in the jacket 1. The holder 4 is mounted on the lower shield case 5 so that the guide roller 6 can be rolled on four protrusions 4a provided on the side surface thereof. The guide is engaged with each of the four guide grooves 5a provided in the lower shield case 5.

FIGS. 3 and 4 show a schematic configuration for selectively positioning and holding the holder 4 at a jacket insertion / removal position and a recording / reproducing position. FIG. 3 shows the holder 4 at a jacket insertion / removal position. FIG. 4 shows the state at the recording / reproducing position.

When the holder 4 is at the insertion / removal position shown in FIG. 3, the projection 4a of the holder 4 rests on the receiving portion 5a1 of the guide groove 5a. The guide roller 6 for reducing the sliding resistance is set on the convex portion 4a as described above. In this state, when the jacket 1 is inserted into the holder 4 and the holder 4 is moved in the direction of arrow a in FIG. 3, the convex portion 4a of the holder 4 comes off the receiving portion 5a1 of the guide groove 5a,
It moves as indicated by arrow c in FIG. In this manner, the jacket 1 in the holder 4 is configured to be set at the recording / reproducing position.

Further, when the jacket 1 is not inserted, that is, when the jacket 1 is at the insertion / removal position, the holder 4 moves in the direction of arrow a in FIG. 3 due to impact or the like, and the guide roller 6 receives the guide groove 5a. So that it does not come off the part 5a1
A trigger 9 is provided on the holder 4 as shown in FIG.
One end of the trigger 9 is engaged with the stopper 5b of the lower shield case 5 to prevent the holder 4 from moving. By inserting the jacket 1 into the holder 4, the trigger 9 engaged with the stopper 5b of the lower shield case 5 rotates in the direction of arrow e in FIG. 5
b, the jacket 1 can be set at the recording / reproducing position as shown in FIG.

Next, the case of taking out the jacket 1 will be described. In FIG. 2, a pressing portion 11a of a lifter 11 is shown.
However, it penetrates a hole provided in the lower shield case 5, projects to the lower surface side of the lower shield case 5, and is engaged with the eject arm 12. An eject button 13 is connected to the eject arm 12, and by pressing the eject button 13, a pressing portion 11 a of the lifter 11 is pushed through the eject arm 12, and the lifter 11 is provided around the convex portion 11 b provided on the lifter 11. 11 rotates to lift the lift portion 11c of the lifter 11 and the lift pin 4c of the holder 4. As a result, the holder 4 is raised, and the guide roller 6 is placed on the receiving portion 5a1 of the guide groove 5a of the lower shield case 6, moves in the direction of arrow d in FIG. Note that a lifter spring 16 is hung between the lifter 11 and the lower shield case 5, and the lifter 11 is always rotating in the direction of arrow f in FIG. Therefore, by inserting the jacket 1 as described above, the holder 4 can be moved to the recording / reproducing position.

Further, in FIG. 2, the eject button 1
Reference numeral 3 denotes an outer shape smaller than the button hole 2a provided in the front bezel 2. The eject arm 12 and the eject button 13 are configured to be connected by snap fit. For this reason, the eject button 13
Is set, the front bezel 2 is attached to the lower shield case 5 first, and the eject button 13 can be set while using the button hole 2a as a guide. As a result, due to the flow of small-sized books,
Further, the ejectability of the eject button can be changed without removing the front bezel even when the specification of the disk device is changed, in addition to improving the setting property of the eject button which is thin and difficult to handle.

A shield case 18 is attached to the upper surface of the lower shield case 5 for the purpose of preventing the inside of the disk drive from being damaged by noise intrusion from outside, dust prevention, and handling. A runner sheet 19 is adhered to the inner surface of the shield case 18 as a smooth surface member for reducing sliding resistance and ensuring insulation. The runner sheet 19 has a purpose of sliding with an upper carriage, which will be described later, and has a low friction coefficient when the shield case 18 is deformed by an external force and slides with the lifter 11, thereby reducing the load. The lifter 11 has a receiving protrusion 11.
d is provided to prevent the shield case 18 from being deformed by receiving a load when an external force is applied to the shield case 18. Even if the shield case 18 and the receiving protrusion 11d are slid, the low-friction runner sheet 19 prevents malfunction due to friction.

Next, a description will be given of a disk drive motor for rotating the disk and a disk chucking mechanism for holding the disk when the disk is driven to rotate by the motor.

FIGS. 5 and 6 are exploded perspective views of a disk drive motor. In this embodiment, a spindle motor is used, and a disk chucking mechanism is provided on a rotor of the motor. In FIG. 5, reference numeral 20 denotes a spindle, which is housed in a jacket (not shown) and is engaged with a center hole of a metal disk hub (not shown) fixed to the center of the disk with an adhesive or the like to determine the center position. Do. A rotor 22 of a spindle motor for driving the disk is press-fitted and fixed to the spindle 20.

By the way, in recent years, the demand for thinner computers has led to a demand for thinner disk drives, and the demand for thinner disk drives has led to the demand for thinner disk drives. It is a common understanding of those involved in device design. Therefore, the thickness of the rotor 22 of the spindle motor is a minimum thickness allowable in design, and in this embodiment, 0.5 mm
Uses a thick iron plate. Even if such a thin iron plate is press-fitted into the spindle 20, the axial run-out length of the rotor 22 with respect to the spindle 20 cannot be ensured because the fitting length in the axial direction is short.

Therefore, the spindle 20 is provided with a groove 20a for an E-shaped retaining ring, and an E-shaped retaining ring 21 is set in the groove 20a. Since the groove 20 a is processed by, for example, a lathe or the like, run-out with respect to the spindle 20 can be minimized. In this embodiment, since the press-fitting is performed until the rotor 22 comes into close contact with the upper surface of the E-shaped retaining ring, if there is no thickness unevenness of the E-shaped retaining ring, the rotor 22 is formed with the same high precision as the runout precision of the groove 20a. Press-fit can be performed.

Since such high runout accuracy can be ensured, the upper surface of the rotor 22 can be directly used as the receiving surface of the disk hub, and good contact between the disk and the recording / reproducing head can be ensured. In this embodiment, the E-shaped retaining ring is used, but a C-shaped retaining ring or a retaining ring similar to this may be used.

In FIG. 5, reference numeral 23 denotes a rotor magnet for generating the torque of the motor, which is attached to the rotor 22 by bonding or the like. The rotor magnet 23 has a convex portion 23a at one position on the outer peripheral portion, performs positioning with the notch 22a of the rotor 22, and is magnetized to two poles, and one signal (for one rotation of the motor). The index signal is generated by a magnetic sensor not shown in the figure. This two-pole magnetization is in phase with the drive magnetization magnetized on the inner surface of the rotor magnet 23, and a stronger magnetic force can be obtained. Further, the lower surface of the rotor magnet 23 in the figure (the surface facing the motor substrate 24 in FIG. 6) is magnetized for multi-polarization for speed detection.
By performing many partial magnetizations on the rotor magnet 23 in this manner, one magnet can be used effectively.

In FIG. 6, on the motor board 24, FIG.
And a detection switch 25 for detecting that the jacket 1 is set at the recording / reproducing position, and a connector 26 for an operation display lamp. At the center of the substrate, a housing 27 and a stator 28 around which a coil is wound are fixed by three countersunk screws 29.

The housing 27 includes a metal bearing 30.
And the ball bearing 31 are press-fitted. The outer diameter of the ball bearing 31 is larger than the outer diameter of the metal bearing 30, so that the outer ring of the ball bearing 31 receives pressure from the ball bearing 31. In this embodiment, the housing 27 is formed of plastic, so that the above-described press-fitting of the bearing can be easily performed, and adverse effects such as deformation and scratches caused by press-fitting the bearing can be minimized. The above-mentioned spindle 20 is inserted in these bearings.

The spindle motor is provided with the disk chucking mechanism as described above, and the structure thereof will be described below. A chucking magnet 32 is attached to the upper surface of the rotor 22, and a hole is provided in a part thereof so that the upper surface of the rotor can be seen. A chucking lever 33 is provided in the hole to engage with the drive hole of the disk hub to rotate and center the disk.

The chucking lever 33 is connected to the rotor 2
2 and the chucking lever 33
Are attached to the rotor 22 by a rotation guide portion 22c which is a part of the rotor 22 in a groove 33b provided in the drive pin portion 33a. Reference numeral 33c denotes a disengagement prevention lever provided near the rotation fulcrum 33d of the chucking lever 33. The lever 33c is wrapped around the lower part of the disengagement prevention claw 22d of the rotor 22, and is rotated by an external impact or the like. Fulcrum 33
d is prevented from coming off the rotation fulcrum 22b.

In the present embodiment, the chucking lever 33 has a plastic integral structure, and the detachment preventing lever portion 33c is configured to be inserted under the detachment preventing claw 22d during assembly. Further, the upper surface of the rotor 22 for receiving the disk hub is provided with a coating 22e of a material having good slidability for receiving the disk hub. The coating 22e is circumferentially coated coaxially with the spindle 20.

Next, the disk chucking mechanism of this embodiment will be described in more detail with reference to FIGS. FIG.
FIG. 8 is an enlarged plan view of a main part in a state where the chucking mechanism of FIG. 5 is mounted on a rotor, and FIG.
FIG. 9 is a cross-sectional view taken along line P-A-B of FIG. 7.

In FIG. 7, the chucking magnet 3
Reference numeral 2 denotes a shape in which a portion with a number of dots is magnetized so that the suction force of the disk hub becomes uniform with respect to the center of the spindle 20. The chucking lever 33 is configured to be rotatable by a required amount around a rotation fulcrum 22b in a hole 22f formed in the rotor 22.

On the other hand, in the thrust direction of the drive pin 33a of the chucking lever 33, as shown in FIGS. 7 and 8, a part of the rotor 22 is inserted into a groove 33b provided in the drive pin 33a of the chucking lever 33. Since the rotating guide portion 22c is engaged, the structure cannot move in the thrust direction (the direction of arrow g in FIG. 8).

With the above configuration, FIG.
When the hub 10a of the disk 10 is attracted by the chucking magnet 32 as shown in FIG. 5, the disk hub 10a in which the drive hole of the disk hub and the drive pin portion 33a are aligned at first is inclined on the upper surface of the drive pin portion 33a. The drive pin 33a is rotated by the rotation of the spindle motor.
And the drive holes of the disc hub coincide with each other, and the disc hub is set.

At this time, the disk hub and the drive pin 33
Since the upper surface of a may slide and wear, the upper surface of the drive pin portion 33a is slightly inclined, so that the area in contact with the disk hub is increased. Note that the above inclination was optimally 1.5 degrees for 2 degrees.

The disc hub 10a may come into contact with the chucking magnet 32 when the disc hub 10a is tilted as described above. However, if a material having a large friction coefficient such as a rubber magnet is used for the chucking magnet 32, for example, In some cases, the disk hub rotates together with the chucking magnet 32, and the drive pin 38a cannot be engaged with the drive hole of the disk hub. Therefore, a sheet is attached or coated on the upper surface of the chucking magnet 32 so that the sliding property is good. If a plastic magnet such as nylon plastic is used,
Since the slidability itself is good, the above processing is not always necessary.

In order to reduce the inclination of the disk hub and perform stable chucking, the engagement amount h between the drive pin 33a and the disk hub in FIG.
It was the best experimentally to make it 7 mm or less. Further, by employing the above chucking structure, the space in the chucking portion can be effectively used, and the outer diameter of the motor rotor is 40 mm, and the thickness from the bottom surface of the motor substrate to the upper surface of the rotor is 4 mm. In addition, the chucking mechanism does not require a dedicated member such as a fulcrum, a drive pin, and various springs, and can be formed as a plastic-integrated chucking lever. The reduction can be achieved.

FIG. 10 is an exploded perspective view showing a state in which a spindle motor as a disk drive motor as described above is mounted on a disk device. The spindle motor 40 configured as described above is disposed on the motor board 24, and the board 24 is attached to the main frame 50 from below the lower shield case 5 with three flat head screws 29.
In this case, a flat hole slightly smaller than the diameter of the head of the flat head screw 29 is formed in the motor board 24 without flat head.
9 is limited. In the present embodiment, the main frame 50 is formed of plastic, and achieves a reduction in weight of the computer, which is increasing in demand as well as a reduction in size of the computer.

At this time, since the spindle motor 40 is mounted on the main frame 50 via the lower shield case 5, the lower head 65 mounted on the main frame 50 and the disk receiving surface 22e of the spindle motor 40 as shown in FIG. (Shown in FIG. 5) cannot be accurately obtained. In this state, good contact between the disk and the head cannot be ensured, which leads to deterioration in the reliability of the disk device. Therefore, in the present embodiment, the height adjustment shims 51a and 51b are inserted between the main frame 50 and the lower shield case 5 and the thickness is selected to adjust the height of the head and the spindle motor. And ensure good contact between the disk and the head.

Next, an example of the configuration of a head seek mechanism in the disk drive of the present invention will be described. 11 is an exploded perspective view showing an example of a head seek mechanism according to the present invention, FIG. 12 is a plan view of a lower carriage section, FIG. 13 is a plan view of an upper carriage section, and FIG. 14 is a bottom view of a carriage and a rack.

In FIGS. 11 and 14, a sintered metal 61 is pressed into the carriage base 60 to guide the movement of the base 60 in the radial direction of the disk. A rack 64 is fixedly engaged with a pinion 63 provided on an output shaft of a step motor 62 for moving and positioning the carriage base 60 for moving and positioning the carriage.

The rack 64 is formed at the tip of two parallel leaf springs 64a so that a preload is applied to the rack 64 and the pinion 63 so that the rack 64 and the pinion 63 can be driven without play. By attaching the parallel leaf spring 64a in a bent state, the rack 64 and the pinion 63 are attached.
During this time, a preload is applied so that the carriage can be accurately moved and positioned. Further, when a force due to an impact is applied to the carriage base 60, the parallel leaf spring 64a is deformed to reduce the impact force, and it is possible to provide a disk device that is particularly resistant to a portable impact required for a small and thin computer device. is there.

Further, a lower carriage 66 as a first carriage is fixed to the carriage base 60 by screwing, and can move in the disk radial direction integrally with the carriage base 60. At the end of the lower carriage 66, a lower head 6 for recording and reproducing signals on a disk is provided.
5 is bonded and fixed to a gimbal spring 67 made of a thin leaf spring in order to maintain good contact between the head and the disk. As shown in FIGS. 12 and 14, a part of the carriage base 60 is provided with the base 6.
A 00 shutter 60a for shutting off the optical sensor 68 for detecting that 0 has moved to the reference position is integrally formed.

In FIGS. 11 and 13, an upper head 72 attached to a gimbal spring 71 is adhered to an upper carriage 70 as a second carriage similarly to the lower head 65. The upper carriage 70 is provided with a fulcrum portion 70b serving as a rotation fulcrum in order to lift the lifting portion 70a by the holder 4 described above with reference to FIG. 1 when setting or ejecting the jacket. It is connected to the carriage base 60 by a suspension 73 made of, and can be opened and closed.

A lifting portion 70a disposed at a substantially intermediate point between the upper head 72 and the suspension 73 of the upper carriage 70.
In order to secure the slidability with the holder 4, a carriage slider 82 made of a member having good slidability, which is different from the upper carriage 70, is fixed by a snap-fit structure.

Further, a head load spring 74 is provided on the suspension support 75 for applying a preload to the lower head 65 and the upper head 72 to obtain a contact pressure with the disk. In particular, the spring hooking portion 70c of the upper carriage 70 has three hooking positions, and has a structure capable of finely adjusting the pressure applied to the head. In addition, the center of the weight of the head by the head load spring 74 is placed inside a triangle connecting the lifting portion 70a of the upper carriage 70 and the two fulcrum portions 70b, so that even if only one portion of the lifting portion 70a is lifted, The structure is such that the carriage 70 is lifted horizontally without being lifted in an inclined state.

Further, the upper carriage 70 is raised
When an impact is applied from the outside in the state of being lifted by a, the tip of the upper carriage 70 is lowered and the fulcrum 70b floats. In an extreme case, the lower head 65 and the upper head 72 may collide and be damaged. For this reason, a projection 70d is provided at the tip end of the upper carriage 70, and is configured to engage with a part of the shutter lever 76 provided on the holder 4 shown in FIG. In this case, the upper carriage 70 is lowered by the impact force, and the upper and lower heads are prevented from colliding and being damaged. Of course, when the jacket is inserted into the holder 4, the shutter lever 76 moves in the direction of arrow i in FIG. 13, disengages from the projection 70d of the upper carriage 70, and the upper carriage 70 freely descends. , The upper head 72 can contact the disk.

In FIG. 11, the upper and lower heads 65 and 72
From above, upper and lower flexible printed circuit boards 77 and 78 for connecting the control circuit and the head are exposed, but the thickness is thin so as not to restrict the movement of the head, and the handleability is poor. Lower flexible printed circuit board 77 for lower head 65
When the lower carriage 66 is attached to the
6a is provided to hold the flexible printed circuit board 77. In the flexible printed circuit board 78 for the upper head 72, the flexible printed circuit board 78 is guided by the hook portion 70e of the upper carriage 70, and the shape of the flexible printed circuit board 78 is maintained in a predetermined shape.

In FIGS. 11 and 12, the carriage base 60 is guided by a slide shaft 79 in the radial direction of the disk and is configured to be movable. Slide shaft 79
Is attached to the main frame 50 by slide shaft clamps 80 and 81.

A step motor 62 for moving and positioning the carriage base 60 in the axial direction of the slide shaft 79.
Rotates 18 degrees for one step. This step motor 6
Pinion 63 and carriage base 6 provided on output shaft 2
In this configuration, the rack 64 provided on the carriage 0 is engaged, and the carriage moves one track each time the step motor 62 performs one step. In addition, the stepping motor 62 has its flange 62a connected to the pressing spring 8 of the slide shaft clamps 80 and 81.
It is fixed to the main frame 50 by pressing with 0a and 81a.

Next, with reference to FIG. 12, the adjustment of each unit including the compatibility required for the disk device will be described.
Note that the lower carriage 66 and the upper carriage 70 are configured to be adjustable independently of the carriage base 60.
As already explained.

In FIG. 12, first, reference track detector adjustment (referred to as 00 adjustment) is performed. Carriage base 6
Since the 00 shutter 60a provided at 0 has no adjustment function as described above, the step motor 62 is first rotated to
The shutter 60a is adjusted so as to block the optical sensor 68 at a predetermined position. Next, the step motor 62 is driven, the carriage is moved to a predetermined position, and the head is moved to the spindle 2.
The position is adjusted to a predetermined circumferential position (offset), angle (azimuth), and radial position (off-track) with respect to the center of 0.

There are two ways to do this. First, there is a method of writing a reference signal (referred to as a burst signal) in the circumferential direction at two places on the inner and outer circumferences on a test disk, and knowing the head offset while reading this signal. Next, this method will be described in detail.

FIG. 15 is an explanatory diagram for knowing the head offset from the burst signal, and is a diagram when the disk is viewed from the plane direction. In FIG. 15, burst signals 92 and 91 are written at the positions of the inner radius r2 and the outer radius r1.
In this state, when the burst signal on the disk is read using the index signal described above with reference to FIG. 5 as a trigger, when the magnetic head is at the original regular position O and has moved to the inner circumference and the outer circumference, the burst signal Occurs at time t1,
At time t2, the angle is the same, so the time is also equal,
t1 = t2.

However, when the head is moved from the normal position O by ΔX
If they are located only a short distance apart, the burst signal generation times are t1 + T1 and t2 + T2, respectively, and the times are not equal because the angles are different. From this time difference, ΔX
Can be obtained by the following equation.

That is, if the disk cycle is a second,

(Equation 1) Can be expressed as

The difference between the outer and inner burst signals is t1 = t2, as can be seen from FIG.

(Equation 2) Can be represented by

Where a / 2π (1 / r1 + r2) = k
(Constant)

(Equation 3) Becomes In this way, the head offset can be known from the time difference between the inner and outer burst signals.

Next, as another method, a method of knowing the offset of the head while reading a signal (referred to as an azimuth signal) of the head angle deviation from the center of the spindle written on the inner and outer circumferences will be described.

FIG. 16 is an explanatory diagram for knowing the offset of the head from the azimuth signal, and is a diagram when the disk is viewed from the plane direction. FIG. 17 is a detailed view of FIG.
In FIG. 16, azimuth signals are written at the positions of the inner radius r2 and the outer radius r1. When the azimuth signal on the disk is read in this state, the magnetic head moves to the original regular position O.
In the case of moving to the outer circumference 93 and the inner circumference 94,
The azimuth signal is θx and does not change.

However, when the head is moved from the normal position O to ΔX
The azimuth signals in the case of being located at a distance only are θ21 and θ22, respectively, and the angles are not equal. From this angle difference, ΔX can be obtained by the following equation.

That is, in FIG. 17, θ21 + θ31
= ΘX, and θ22 + θ32 = θX. Thus, θ21−θ22 = θ32−θ31.

Also,

(Equation 4) Can be expressed as

In this manner, the offset of the head can be known from the azimuth signals on the inner circumference and the outer circumference. When the offset of the head is released, the offset of the head, the angle (azimuth) of the head, and the position (off-track) from the center are defined by the V-groove 70 of the upper carriage 70 in FIG.
e, adjustment may be made by grasping the V-groove 66a provided in the lower carriage 66 of FIG. The details of these adjustments are omitted because there is a detailed description in "All of Floppy Disk Devices" CQ Publisher.

In the above-mentioned adjustment, a method of adjusting the position of the carriage by rotating the step motor 62 while energizing the step motor 62 is generally performed. When the step motor 62 is rotated, the pinion 63 shown in FIG. 14 is also rotated, and the engaged rack 64 is moved to adjust the position of the carriage.
As shown by the arrow, the flange portion 62 of the step motor 62
a is cut out to facilitate adjustment by a jig and automation.

The step motor 62 is inserted and positioned in the hole provided in the main frame 50. However, since there is a clearance between the step motor 62 and the hole, a part of the slide shaft clamp 81 is removed so that the clearance is eliminated during adjustment. Preloading is performed in the direction of arrow j in FIG. 12 by the provided preload spring portion 81b. With these structures, the step motor 62
Does not need to be re-fixed after adjustment, and since the position can be held by the spring, there is no occurrence of an adjustment position shift due to re-fixing, and high-precision adjustment is possible.

Next, the height adjustment of the upper carriage will be described. 18 and 19 are sectional views of the carriage. When the jacket is not inserted into the holder 4 as described above, the upper carriage 70 is lifted by the lifting portion 70a engaging with the holder 4 as shown in FIG. However, the height of the holder 4 often fluctuates due to various manufacturing variations, which is a serious problem for those who are involved in designing a disk drive. That is, when the thickness of the disk drive is reduced, the height of the upper head varies, and the jacket and the upper head interfere with each other to damage the upper head.

In this embodiment, as shown in FIG.
In this structure, the upper carriage 70 is lifted up, but the top end of the upper carriage 70 is in contact with the runner sheet 19 stuck to the upper shield cover 18, and as shown in FIG. Even if the upper carriage 70 is raised too much, the fulcrum 7 of the upper carriage 70
0b is separated from the carriage base 60 so that the height variation of the holder 4 can be absorbed. Even if the thickness of the holder 4 is reduced and the space in the thickness direction is reduced, a special dimensional accuracy is given to each member. It is not necessary to make a request or to add a subtle adjustment at the time of assembly, and extremely stable mass production is possible.

The runner sheet 19 as the smooth surface member of this embodiment is obtained by sticking a Teflon (registered trademark) tape member to the upper shield cover 18 by means of a double-sided adhesive tape or the like. However, it is not limited to a tape member or the like, and may be a thin plate member such as a stainless steel plate having a smooth surface depending on the sliding compatibility with the upper carriage 70.

20 to 23 show an example of the head mounting structure. FIG. 20 is a sectional view of a main part of the head mounting structure.
21 is a plan view of FIG. 20 viewed from the direction A, and FIG.
FIG. 23 is a bottom view seen from the direction B at 0, and FIG. 23 is an explanatory diagram of a state where a disc is loaded. The upper half of FIGS. 21 and 22 is shown with a part of each member being removed in a half cross section.

In FIGS. 20, 21 and 22, the lower head 65 and the upper head 72 are arranged in the radial direction XX and the circumferential direction Y of the flexible disk 10 mounted in the apparatus.
They are mounted on the upper carriage 70 and the lower carriage 66 via gimbal springs 67 and 71 having flexibility for giving a degree of freedom in the −Y direction. The lower carriage 66 is configured to be movable in the radial direction of the disk 10 as described above, and the upper carriage 70 is attached to the carriage base 60 so as to be openable and closable. Further, by closing the carriage 70 by a pressing member such as the head load spring 74, the two heads 65 and 72 elastically slidably contact the disk 10 with a predetermined pressure by the gimbal springs 67 and 71.

In the present embodiment, the gimbal spring 67 is formed of a substantially flat thin plate spring material, and as shown in FIG.
An outer peripheral portion 67b formed of a flat surface for mounting on the carriage 66 and surrounding the central portion 67a;
And a flexible portion having flexibility by connecting the outer peripheral portion 67b.

The flexible portions are provided at two locations in the disk circumferential direction between the central portion 67a and the outer peripheral portion 67b, and each flexible portion is provided in the radial direction XX of the disk.
A pair of connecting portions 67c provided on the line Y-Y in the drawing to have a degree of freedom of movement in the direction, and extending from the connecting portion 67c and connected to the outer peripheral portion 67b, the freedom of movement of the gimbal spring 67 in the thickness direction. And a pair of arm portions 67d for giving a degree of freedom and a slight degree of freedom of movement in the Y-Y direction.

In the present embodiment, the other gimbal spring 71 is also formed of the same material as that of the above-described gimbal spring 67 and has the same structure. As shown in FIG. It comprises a flexible portion to be connected, and the flexible portion is composed of a connecting portion 71c and a pair of arm portions 71d.

Next, the gimbal springs 67 and 7 having the above-described structure will be described.
1 will be described. The lower head 65 and the upper head 72 are configured to slidably contact the disk 10 at a predetermined pressure as described above, and the lower head 65 is connected to the connecting portion 67c and the arm-shaped portion 67 at the predetermined pressure.
Due to the flexure of the flexible portion consisting of d, it sinks by the amount ΔX in FIG. 20 and is in a state of equilibrium with the predetermined pressure. The flexibility of the lower head 65 with respect to the bending of the disk 10 is configured by the flexible gimbal spring 67 in an equilibrium state sinking by the amount of ΔX to improve the contact performance.

On the surface of the gimbal spring 67 on the head 65 side, a gimbal protector 97 as a covering member for covering the gimbal spring 67 is provided. The gimbal protector 97 is a flat surface on which the lower head 65 is mounted. The gimbal spring 67 is mounted on an outer peripheral portion 67b with a gap of Δx in FIG. 20, and is fixed together with the outer peripheral portion 67b by a fixing means such as an adhesive 99.

The gimbal protector 97 is formed of a substantially flat plate-like member and has an opening 97a through which the lower head 65 can be inserted.
However, the gimbal spring 67 does not impede the degree of freedom of normal movement following the deflection of 0. However, if the gimbal spring 67 is excessively deformed due to an unexpected disturbance or the like, the gimbal spring 67 may hit the central portion 67a. In this configuration, the excessive deformation is prevented by contact.

The upper head 72 facing the lower head 65
Is supported substantially at the center via a gimbal spring 71 by a pivot 70a formed on the upper carriage 70,
Like the lower head 65 described above, the gimbal spring 71 having flexibility provides the disk 10 with a follow-up property against bending, thereby improving the contact performance. The gimbal spring 71 is supported by a pivot 70a in a substantially flat state, and its outer peripheral portion 71b is fixed to the upper carriage 70 by a fixing means such as an adhesive 99.

The upper head 72 of the gimbal spring 71
On the side surface, a gimbal protector 98 as a covering member for covering the gimbal spring 71 is provided, and the gimbal protector 98 has an outer peripheral portion 7 of the gimbal spring 71.
A step 98b is formed so as to form a gap with the upper carriage 70 and the amount of Δy in FIG. Further, the protector 98 has an opening 98a through which the upper head 72 can be inserted. The protector 98 is inserted through the upper head 72 and fixed to a central portion 71a formed of a flat surface by, for example, an adhesive fixing means.

Therefore, the gimbal protector 98 is
As in the case of the gimbal protector 97 described above, the upper head 72 does not hinder the degree of freedom of the normal movement following the deflection of the disk 10, but the gimbal spring 71 is excessively deformed due to, for example, an unexpected disturbance. If so, the outer peripheral portion 71b of the gimbal spring 71 or the upper carriage 7
0 to prevent the excessive deformation.

In the above configuration, the lower head 65 mounted on the lower carriage 66 via the gimbal spring 67,
The jacket 1 is mounted between the upper head 72 mounted on the upper carriage 70 via the gimbal spring 71 and opened.
23, when the jacket 1 is first inserted in the direction of the arrow m in FIG. 23 and reaches a predetermined position, the jacket 1 is moved in the direction of the arrow n by the operation of the trigger mechanism to establish a predetermined relationship. At the same time, the upper carriage 70 moves in the direction in which the upper head 72 approaches the lower head 65, that is, in the closing direction.
The recording / reproducing operation is performed by approaching the head window 1a formed in the disk 10 and making a predetermined contact with the disk 10. When removing the jacket 1, the moving operation is performed in the reverse order of the above operation.

At this time, the lower head 65 and the upper head 72
Is configured to slide on the disk 10 at a predetermined pressure as described above, and the lower head 65 is bent by bending of the flexible portion including the connecting portion 67c and the arm portion 67d due to the predetermined pressure. The lower head 65 follows the deflection of the disk 10 by the gimbal spring 67 which is in a state of equilibrium with the predetermined pressure by sinking by the amount of Δx of 20 and is in a state of equilibrium by sinking by the amount of Δx. This ensures that the contact performance is improved.

Further, in a disk drive pursuing thinness to the limit of recent days, even when the upper carriage 70 shown in FIG. 23 is open, the gap between the lower head 65 and the upper head 72 is narrow, and when the jacket is detached. Although the risk of interference between the lower head 65 or the upper head 72 and a part of the jacket 1 such as the head window 1a formed in the jacket 1 increases, the above-described configuration makes the gimbal protector 9
The gimbal spring 7 does not impede the degree of freedom of normal movement in which the lower head 65 follows the deflection of the disk 10 and, if the gimbal spring 67 is excessively deformed due to, for example, an unexpected disturbance. 67 central part 67
a to prevent the excessive deformation.

For example, when the disk 10 is replaced, an unusual state in which an unexpected disturbance acts such that a part of the jacket 1 comes in contact with a part of the lower head 65 is applied to the flexible gimbal spring 67. Even when an excessive stress different from the normal state is applied, the gimbal spring 67 is deformed only in the gap of Δx amount in FIG. 20, but when the gimbal spring 67 is deformed beyond the gap amount of Δx, the gimbal spring 67 is covered. A gimbal protector 97 having a function as a cover member and as a displacement restricting means for restricting a displacement amount of the flexible portion of the gimbal spring 67 abuts on a central portion 67a of the gimbal spring 67 and causes excessive displacement of the spring 67. To prevent deformation and the like.

The gimbal protector 98, like the gimbal protector 97, prevents the gimbal spring 71 from being excessively deformed without impeding the degree of freedom of normal movement of the upper head 72 following the deflection of the disk 10. For example, even if an excessive stress different from the normal state is applied to the gimbal spring 71 when the disk 10 is replaced, the gimbal spring 71 is deformed only in the gap of the amount y in FIG.
When the deformation exceeds the gap amount of y amount, the gimbal protector 98 having the function of the covering member for covering the gimbal spring 71 and the displacement restricting means comes into contact with the outer peripheral portion 71b of the gimbal spring 71 or the upper carriage 70, and By preventing excessive deformation, at least the flexible portion of the gimbal spring 71 can be protected.

Therefore, the flexible portions of the gimbal springs 67 and 71 are deformed, so that it becomes impossible to maintain the contact performance of the lower head 65 and the upper head 72 against the bending of the disk 10. Since no serious accident is caused, it is possible to minimize the gap between the heads 65 and 72 and the jacket 1 as much as possible, and it is possible to provide a stable disk device that is thinner to the limit. The gap of Δx · Δy in FIG. 21 is a size that does not impede the degree of freedom of the normal movement in which the lower head 65 and the upper head 72 follow the deflection of the disk 10 and the gap of the gimbal springs 67 and 71. What is necessary is just to set the magnitude | size which suppresses a flexible part to the deformation amount within elastic deformation.

In the above-described embodiment, the gimbal protector 97 is fixed to the lower carriage 66 by a fixing means such as an adhesive 99. However, the present invention is not limited to this. For example, it may be fixed directly to the lower carriage 66. In the embodiment, the gimbal protector 98 abuts on the outer peripheral portion 71b of the gimbal spring 71 and the upper carriage 70 so as to prevent the flexible portion of the gimbal spring 71 from being deformed. For example, a structure that abuts either the outer peripheral portion 71b of the gimbal spring 71 or the upper carriage 70 may be used.

Further, in the head mounting structure of the above embodiment,
The lower head 65 and the upper head 72 are configured to slidably contact the disk 10 rotated by the above-described pressing mechanism at a predetermined pressure. Due to the bending of the flexible portion having the flexible portion 67d, it sinks by the amount of Δx in FIG. 20 and is in a state of equilibrium with the predetermined pressure.
The gimbal spring 67, which is flexible in a balanced state and sinks by the Δx amount, configures the followability of the lower head 65 to the deflection of the disk 10 to improve the contact performance. The upper head 72
Is supported substantially at the center via a gimbal spring 71 by a pivot 70a formed on the upper carriage 70,
Similar to the lower head 65 described above, the gimbal spring 71 has flexibility to follow the deflection of the disk 10 to improve the contact performance.
The present invention is not limited to this combination. Even if the upper head 72 has the same mounting structure as the lower head 65, the lower head 65 may have the same mounting structure as the upper head 72. A mounting structure may be used.

By the way, the heads 65 and 72 as described above
For example, Japanese Patent Laid-Open Publication No.
As described in Japanese Patent Application Publication No. 4 (1999) -1994, in addition to requirements such as bending in the radial direction and bending in the circumferential direction, sliding friction largely determines sliding conditions. That is, the upper and lower heads that are in sliding contact with the rotating disk do not always perform stable sliding contact, but from a microscopic viewpoint, the upper and lower heads repeatedly contact the disk while repeating a so-called stick-slip phenomenon in the circumferential direction. In contact with, the disk is relatively moving, and the repetition frequency band of the stick-slip phenomenon substantially coincides with the spring constant of the connecting portion of the gimbal spring provided in the disk radial direction.
In some cases, the resonance phenomenon occurs, and a so-called “squealing phenomenon” is generated, or a problem occurs in the compatibility of reproduced signals due to a timing disorder of a signal reproduced by a head or the like.

In this regard, according to the head mounting structure of the above-described embodiment, the upper and lower heads 72 and 65 are mounted on the carriages 70 and 66 via the gimbal springs 71 and 67, respectively, so that the two heads 65 against the deflection of the disk 10 are provided.・
The gimbal springs 67 and 71 according to the present embodiment are similar to the conventional example in that the gimbal springs 67 and 71 of the present embodiment are made of a substantially flat flat thin plate spring material.
A pair of connecting portions 67c, each of which includes a pair of flexible portions 71a and outer peripheral portions 67b, 71b, and flexible portions disposed on both sides in the circumferential direction of the disk between the two. 71c and their respective connecting portions 67c and 71c
And a pair of arm-shaped portions 67d and 71d extending toward the outer peripheral portions 67b and 71b.

The connecting portions 67c and 71c allow the head to have a degree of freedom in the radial direction of the disk, and the pair of arm portions 67d and 71d provide a degree of freedom in the movement of the gimbal springs 67 and 71 in the thickness direction and a small amount of disk movement. It is configured to have a degree of freedom of movement in the circumferential direction.
The spring constant of the flexible portion can be set to be larger than that of the conventional one, and the repetition of the stick constant and the stick-slip phenomenon that occurs when the lower head 65 slides on the disk 10 as in the conventional example. Since the frequency band does not coincide with the frequency band, there is no occurrence of the above-mentioned so-called "squealing phenomenon", which is a resonance sound, and there is no occurrence of timing disturbance of the signal reproduced by the head. There are advantages such as not.

Further, as described above, the gimbal spring structure in which the flexible portion is arranged only in the circumferential direction of the disk 10 has a simple shape, and the risk of deformation or damage due to handling during mass production is extremely small. This not only enables stable mass production, but also does not require a large flat space for forming a flexible portion as in the conventional example, which is effective for miniaturization of a disk drive.

The above gimbal protectors 97 and 98
The displacement restricting means such as described above can be applied not only to the gimbal spring structure shown in FIGS. 21 and 22 but also to various structures. And a frame-shaped portion provided between the main portion and the outer peripheral portion surrounding the central portion, which is formed of a flat surface to be mounted on the carriage, and the frame-shaped portion and the central portion and the outer peripheral portion are arranged in the disk radial direction and the circumferential direction respectively. The present invention is also applicable to a device using a gimbal spring connected via a connecting portion.

[0090]

As described above, the disk device according to the present invention holds the jacket containing the disk as described above and moves between the jacket insertion / removal position and the recording / reproducing position, and moves in the radial direction of the disk. A first carriage and a second carriage which are possible, and a first head and a second head which are respectively mounted on the first carriage and the second carriage and record or reproduce signals on the disc, and The second carriage is provided with a lifting portion for rotating the second carriage in accordance with a movement operation between the holder insertion / removal position and the recording / reproducing position of the holder. In a disk device which is rotatably held between a jacket insertion / removal position and a recording / reproducing position by a first carriage, the holder includes the second Wherein when the head mounting unit for mounting the second head of Yarijji moves in a direction approaching the first carriage in the jacket insertion and removal position the second
A regulating position that abuts on the carriage to regulate the movement,
A restricting means is provided that can move to a non-regulating position that does not restrict the movement without abutting on the second carriage, and the restricting means moves the restricting position from the restricting position by an operation of inserting the jacket into the holder. Since the disk drive is configured to move to the non-restricted position, even if a certain external impact is applied to the disk device, the disk device is moved to the second position by the restricting means.
The carriage is prevented from moving in the direction approaching the first carriage, and it is possible to reliably prevent the two heads from colliding with each other. When the jacket is inserted into the holder, the regulation by the regulation means is released. Record
The playback operation becomes possible.

[Brief description of the drawings]

FIG. 1 is a partial exploded perspective view showing an embodiment of a disk drive according to the present invention.

FIG. 2 is an exploded perspective view of another part of the embodiment.

FIG. 3 is a schematic side view showing an arrangement configuration of a holder in the embodiment.

FIG. 4 is a schematic side view showing an arrangement configuration of a holder in the embodiment.

FIG. 5 is an exploded perspective view of a part of the disk drive motor in the embodiment.

FIG. 6 is an exploded perspective view of a part of the disk drive motor in the embodiment.

FIG. 7 is an enlarged plan view of the chucking mechanism in the embodiment.

FIG. 8 is a sectional view taken along line APA in FIG. 7;

FIG. 9 is a sectional view taken along the line BPOB in FIG. 7;

FIG. 10 is an exploded perspective view showing an assembled state of the disk drive motor in the embodiment.

FIG. 11 is an exploded perspective view of the head seek mechanism in the embodiment.

FIG. 12 is a plan view of a lower carriage unit in the embodiment.

FIG. 13 is a plan view of an upper carriage unit in the embodiment.

FIG. 14 is a rear view of the carriage and the rack in the embodiment.

FIG. 15 is an explanatory diagram showing a procedure for detecting a head offset from a burst signal.

FIG. 16 is an explanatory diagram showing a procedure for detecting a head offset from an azimuth signal.

FIG. 17 is a detailed view of a main part of FIG. 16;

FIG. 18 is a sectional view of a carriage portion in the embodiment.

FIG. 19 is a drawing showing the operation state of the carriage.

FIG. 20 is a longitudinal sectional view of a head portion in the embodiment.

FIG. 21 is a plan view of a lower head in the embodiment.

FIG. 22 is a bottom view of the upper head in the embodiment.

FIG. 23 is an explanatory diagram showing a state where a disk is loaded between upper and lower heads.

[Explanation of symbols]

 Reference Signs List 1 jacket 4 holder 60 carriage base 65 first head (lower head) 66 first carriage (lower carriage) 70 second carriage (upper carriage) 70a lifting portion 70b fulcrum 65 second head (upper head) 76 shutter lever

Continued on front page (31) Priority claim number Japanese Patent Application No. 3-137399 (32) Priority date June 10, 1991 (1991.6.10) (33) Priority claim country Japan (JP) (31) Priority claim number Japanese Patent Application No. 3-151526 (32) Priority date June 24, 1991 (1991.24.24) (33) Priority claim country Japan (JP) (31) Priority claim number 3-151527 (32) Priority date June 24, 1991 (June 24, 1991) (33) Countries claiming priority Japan (JP)

Claims (1)

[Claims] 1. A holder for holding a jacket containing a disk and moving between a jacket insertion / removal position and a recording / reproducing position, a first carriage and a second carriage movable in a radial direction of the disk, A first head and a second head which are respectively mounted on the first carriage and the second carriage and record or reproduce a signal with respect to the disk; and the second carriage includes the second carriage. A lifting portion is provided for rotating following the movement of the holder between the jacket insertion / removal position and the recording / reproducing position, and the second carriage is provided on the first carriage with the jacket insertion / removal position and recording. In a disk device rotatably held between a reproducing position and the holder, the holder is configured to receive the second head of the second carriage. When the mounting portion moves in a direction approaching the first carriage at the jacket insertion / removal position, the second mounting portion controls the movement by contacting the second carriage and the second carriage without contacting the second carriage. A restricting means movable to an unregulated position that does not restrict movement is provided, and the restricting means is configured to move from the restricted position to the non-restricted position by an operation of inserting the jacket into the holder. A disk device, comprising: