JP3103632B2 - Rotary information recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary information recording / reproducing apparatus for performing positioning by rotating a head to a predetermined position on an information recording disk, and in particular, for positioning the head at high speed and with high accuracy. It is related to the mechanism of.

[0002]

2. Description of the Related Art As a rotary information recording / reproducing apparatus according to the present invention, there are an optical disk apparatus, a magnetic disk apparatus and the like. Here, the magnetic disk apparatus will be described.
FIG. 14 shows an example of a conventional magnetic disk drive. The stacked information recording disks 8 are rotationally driven at a constant rotational speed by a disk rotation driving motor 10 fixed to a base 9. This rotation drive is performed by a disk rotation drive circuit 25C in response to a command from the microcomputer 25. A head 1 is supported on the carriage 3A via a head support spring 2, and the head 1 floats on the disk 8 with a small gap therebetween, and records and reproduces information on the head. The positioning of the head 1 with respect to the disk 8 is performed by rotating the carriage 3A with the voice coil motor 24.

The carriage 3A is supported by a rotating shaft 5 fixed on a base 9 via a ball bearing 19, and rotates around the rotating shaft 5. The voice coil motor 24 for driving the carriage 3A includes a voice coil 4A, a permanent magnet 16E, and a yoke 15C. Then, the permanent magnet 16 forming the magnetic circuit
The voice coil 4A sandwiched between the E and the yoke 15C is driven to rotate by energization. This energization is performed by the DA converter 2 according to an instruction from the microcomputer 25.
5E, via the voice coil motor driver 25D.

In this conventional magnetic disk drive, magnetic circuits 15C and 16E of a voice coil motor, a carriage rotation shaft 5, a disk rotation drive motor 10 and the like are fixed on a base 9. Therefore, when the voice coil 4A of the voice coil motor 24 is energized and generates a driving force based on the positioning command of the microcomputer 25, the voice coil motor magnetic circuit 15 receiving the reaction force is driven.
C and 16E vibrate the base 9. Then, the disk rotation drive motor 10 is excited by the exciting force,
The disk 8 vibrates. As a result, a relative displacement occurs during positioning between the head 1 supported by the carriage 3A and the disk 8, thereby causing off-track or
The positioning settling time becomes longer and the positioning performance is hindered. Therefore, in order to perform high-speed and high-precision positioning, structural vibration due to the reaction force of the voice coil motor must be minimized. The microcomputer 25 performs the negative feedback control of the head 1 by obtaining the position of the head 1 by the position demodulation circuit 25A and taking in the position via the AD converter 25B.

As means for solving this structural vibration, there is, for example, one disclosed in Japanese Patent Application Laid-Open No. Sho 59-210573. In this example, the carriage holding the voice coil and the voice coil motor magnetic circuit are configured to be independently rotatable around the rotation axis,
The magnetic circuit of the voice coil motor is engaged with a buffer member disposed on the base via one end of the magnetic circuit. Therefore, when the voice coil supported by the coil of the carriage is energized, and the carriage is driven to rotate in a certain direction, the magnetic force of the voice coil motor magnetic circuit is slightly rotated around the rotation axis in the opposite direction to the carriage by the reaction force. Displace. Then, the minute rotational vibration of the voice coil motor magnetic circuit is transmitted to the cushioning material via the plate and is attenuated. Thus, the transmission of the reaction force to the base due to the movement of the carriage is reduced.

Another solution is disclosed in, for example,
There is one disclosed in Japanese Patent Publication No. 217774. In this example, the actuator movable section having the voice coil is kept in static balance with the rotation axis of the actuator drive motor, and the magnet section constituting the actuator drive motor is positioned with respect to the rotation axis of the actuator drive motor. And static balance is maintained. For this reason, even if the actuator movable part rotates, it is difficult for a translation force to be generated in the head disk assembly. In addition, since the magnet part constituting the actuator drive motor is rotatably supported with respect to the base, the reaction force transmitted to the base by rotation of the actuator movable part is small.

[0007]

Problems to be Solved by the Invention
In the above prior art disclosed in Japanese Patent No. 73,
The center of gravity and the center of gravity of the magnetic circuit of the voice coil motor, which is rotated and displaced by the driving reaction force of the carriage, do not match.
Accordingly, the carriage rotating shaft is vibrated by the inertial force due to the rotation imbalance, and the vibration is transmitted to the disk rotation driving motor through the base. As a result, a relative displacement may occur during positioning between the head supported by the carriage and the disk, which may hinder the positioning operation.

On the other hand, the magnetic circuit of the voice coil motor is engaged with a cushioning member arranged on the base via a plate at one end thereof. This system is a vibration system consisting of the mass of the voice coil motor magnetic circuit, the spring constant of the plate, the spring constant of the cushioning material, and the viscous damping coefficient. Exhibits vibration reduction effect. However, since the head positioning distance command is often issued at random and the driving angular acceleration of the carriage always changes in accordance with the head positioning distance, a structural vibration that is always stable against external excitation forces of various frequencies. No reduction effect can be obtained.

Further, the prior art disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 1-217774 has the following problem. In other words, all of the mechanical elements do not fit in the device housing, and the motor magnet is freely rotatably supported on the sub-base protruding from the base.
The height of the device is increased, and its assembly is complicated. Further, since the carriage is cantilevered with respect to the base, sufficient support rigidity cannot be obtained.
Further, since the carriage is driven at one end thereof, a torsional moment acts on the rotating shaft. Particularly when the device is used in a vertical position, bending of the rotating shaft due to its own weight becomes a problem. Furthermore, a recoil portion, that is, a retract spring for maintaining a neutral position of the motor magnet, is provided, but there is no damping mechanism for absorbing the kinetic energy of the recoil portion, and the recoil portion moves during a seek for this purpose. May be excited.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a rotary information recording apparatus which effectively eliminates vibration of a carriage rotating shaft and base vibration caused by a carriage driving reaction force, which hinder high-speed and high-precision positioning of a head. To provide.

Another object of the present invention is to provide a rotary information recording apparatus which makes the entire apparatus thinner and can be easily assembled.

Another object of the present invention is to provide a rotary information recording apparatus capable of sufficiently withstanding vertical use.

[0013]

According to the present invention, there is provided a driving means comprising a working portion and a reaction portion disposed on a first base, a carriage driven by the driving means, an information recording / reproducing head mounted on the carriage. In a rotary information recording / reproducing apparatus for recording / reproducing information on a disc on which information is recorded by the head, an operation section of the driving means is fixed to a carriage, and a reaction section of the driving means is connected to a rotation axis of the carriage. A second base that is rotatable coaxially, and a damping mechanism is interposed between the first base and the second base; the damping mechanism includes a notch formed in the second base; A projection formed on the first base so as to be engaged with the notch; and a viscoelastic member symmetrically disposed on both sides of the projection so as to fill a gap between the projection and the notch. In discloses configured rotary information recording and reproducing apparatus.

Further, the present invention discloses a rotary information recording / reproducing apparatus having a plurality of attenuating mechanisms, the plurality of attenuating mechanisms being arranged inside the outer periphery of the driving means.

Further, the present invention comprises a driving means comprising an operating portion and a reaction portion disposed on a first base, a carriage driven by the driving means, and an information recording / reproducing head mounted on the carriage. In the rotary information recording / reproducing apparatus for recording / reproducing information on a disk for recording information, an operating part of the driving means is fixed to a carriage, and a reaction part of the driving means is rotatable coaxially with a rotation axis of the carriage. A viscoelastic member is fixed in a stacked manner between the reaction portion of the driving means fixed on the second base and the second base and between the first base and the second base. A rotary information recording / reproducing apparatus is disclosed.

Further, the present invention discloses a rotary information recording / reproducing apparatus in which the second base is divided into a plurality of portions in a thickness direction, and a viscoelastic member is also arranged between the divided portions in a laminated manner.

Further, the present invention discloses a rotary information recording / reproducing apparatus in which the second base is rotatable via a bearing mounted on a rotary shaft shared with the action section.

Further, the present invention discloses a rotary information recording / reproducing apparatus in which the second base is rotatable coaxially with the rotation axis of the carriage via a rolling bearing provided on the first base.

Further, according to the present invention, a plurality of driving means are provided, and a reaction portion of each driving means is fixed to the second base, and the second base and the working side including the carriage of each driving means are connected to the first base. Around the rotating shaft erected on the base,
A rotary information recording / reproducing device characterized by being provided so as to be independently rotatable is disclosed.

Further, the present invention discloses a rotary information recording / reproducing apparatus in which the upper end of a rotating shaft is fixed to a cover.

Further, according to the present invention, the carriage is rotationally driven by driving means comprising a working portion and a reaction portion disposed on the first base, thereby positioning the information recording / reproducing head mounted on the carriage with respect to the disk. In the rotary information recording / reproducing apparatus, the reaction unit of the driving means is rotatable coaxially with the operation unit and independently of the operation unit, and the inertia moment of the reaction unit is increased by adding an additional mass to the reaction unit. The disclosed rotary information recording / reproducing apparatus is disclosed.

Further, the present invention discloses a rotary information recording / reproducing apparatus in which the member of the reaction portion or the additional mass is formed of a material having a specific gravity greater than that of the member of the action portion.

Further, the present invention describes a rotary information recording / reproducing apparatus in which the second base is rotatable via a bearing mounted on a rotary shaft shared with the action section.

Further, the present invention discloses a rotary information recording / reproducing apparatus in which a second base is rotatable coaxially with a rotation shaft of the carriage via a rolling bearing provided on the first base.

Further, the present invention relates to a rotary information recording / reproducing apparatus including a driving means comprising an operating portion and a reaction portion disposed on a first base, and a carriage driven by the driving means. A rotary information recording / reproducing apparatus characterized in that a driving means for finely driving a reaction portion of the means in the carriage rotation direction is provided.

Further, according to the present invention, there is provided a rotary type information in which a second base for fixing a reaction portion of a driving means is provided, and an actuator as a minute driving means is formed on a portion including an outer peripheral portion and an outer peripheral portion of the second base. A recording / reproducing device is disclosed.

Further, the present invention discloses a rotary information recording / reproducing apparatus in which an actuator as a minute driving means is formed on a portion including a facing surface of a first base and a second base.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As schematically shown in FIGS. 1 to 3, a rotary information recording / reproducing apparatus according to the present invention has all of its mechanical elements on one side of a base 9 (first base). , And are all housed in the housing 11 including the base 9 and the cover 34. The stacked disks 8 are rotationally driven by a disk rotation drive motor 10 fixed to a base 9, and a head 1 for recording and reproducing information is provided with a head support spring 2 on a carriage 3A.
Attached through. A flexible cable 23 in which a power line for energizing the voice coil 4A installed on the carriage 3A and a signal line of the head 1 are combined as shown in FIG.
As shown in the figure, the head 1 is pulled out from the position opposite to the head 1 with respect to the carriage rotation shaft 5.

The method of supporting the carriage 3A will be described with reference to FIGS. The carriage 3A is rotatably supported on a rotating shaft 5 fixed to a base 9 via two rolling bearings 19A and 19B.
A, a pair of left and right voice coil motors 24 including permanent magnets 16A to 16D and yokes 15A and 15B. The right and left pair is used to drive the carriage 3A by a couple of both. A pair of left and right voice coil holders 3B protrude from the carriage 3A, and a voice coil 4A is attached to each of the pair of voice coil holders 3B.
Are fixed by bonding. In addition, permanent magnets 16A-1
The voice coil motor magnetic circuit 6 formed by the 6D and the yokes 15A and 15B is fixed to a reaction base 21 (second base). Accordingly, the pair of voice coils 4A held by the voice coil holder 3B and projecting from the carriage 3A are in a non-contact state with the voice coil motor magnetic circuit.

Next, the manner in which thrust is generated by the voice coil motor will be described with reference to FIG. The magnetic circuit of the voice coil motor is obtained by laminating two sector-shaped permanent magnets 16A to 16D to two sector-shaped yokes 15A and 15B with an adhesive and fixing them to the reaction base 21 with two collars 17 and screws 18. Is formed. Then, two permanent magnets 16A, 16B attached to the upper yoke 15A and two permanent magnets 16C, 16 attached to the lower yoke 15B.
D is arranged adjacent to each other with opposite polarities. On the other hand, the voice coil 4A protruding from the carriage 3A is formed by winding a copper wire or an aluminum wire in multiple layers and solidifying it.
These magnets are arranged in a non-contact manner in a gap portion 7 sandwiched between the four permanent magnets 16A to 16D.

Therefore, between the magnets 16B and 16D, FIG.
A magnetic flux B is generated upward as shown in FIG.
A magnetic flux B is generated downward between C. In this environment, when a current I is applied to the voice coil 4A in the direction indicated by the reference sign, a thrust F is generated in the direction of the arrow in the drawing on the left bundle 4C and the right bundle 4D of the voice coil. It can be driven to rotate around the rotation axis 5. The driving direction of the voice coil can be reversed by flowing the current I in the opposite direction.

Here, the voice coil motor for driving the carriage is not limited to the configuration of the present embodiment, but may have a configuration having a center yoke. Further, in this embodiment, a so-called moving coil type actuator in which a voice coil is mounted on a carriage is configured, but a so-called moving magnet type actuator in which a permanent magnet is mounted on a carriage may be configured.

In this embodiment, as described above, the carriage 3A is driven around the rotation shaft 5 by a couple by means of a pair of voice coil motors. Therefore, the force for bending the rotating shaft 5 or the translational force acting on the rotating shaft 5 is extremely small. Further, in this embodiment, in order to prevent rotation imbalance of the carriage, as shown in FIG. 2, the magnetic head preamplifier 27 is disposed on the opposite side to the magnetic head 1 as viewed from the rotation shaft 5 to balance. I have. For this reason, when the carriage 3A is driven, no force that vibrates the rotating shaft 5 is generated by the inertial force due to the rotation imbalance of the carriage. As a result, it is possible to reduce the displacement of the head and the fluctuation of the flying height of the head due to the vibration of the carriage rotating shaft, and it is possible to perform high-speed and high-accuracy head positioning.

Further, in this embodiment, measures are taken to prevent the off-track or the delay in the positioning settling time from occurring by transmitting the carriage driving reaction force to the base and vibrating the disk rotation drive system. This will be described below with reference to FIG. FIG. 6 shows the configuration of the reaction base and the damping mechanism, and the arrows indicate the parts where the parts are engaged with each other.

A pair of voice coil motor magnetic circuits 6
It is fixed on the reaction base 21 by screws or adhesive. The rotating shaft 5 is fixed to the shaft fixing hole 37 provided in the base 9 by a screw or an adhesive. Then, the bearing 20 attached to the rotating shaft 5 is moved to the reaction base 21.
The reaction base 21 is rotatable around the rotating shaft 5 by fixing it to the bearing fixing hole 38 formed by the adhesive bonding or the like. Also, a carriage 3A on which the head 1 is mounted is supported rotatably about the rotation shaft 5 coaxially with the reaction base 21 via two bearings 19A and 19B, and the carriage 3A is energized to the voice coil 4A. , So as to rotate. Note that a rolling bearing or a sliding bearing is used as the bearing 20.

As described above, since the carriage rotation axis and the reaction base rotation axis are shared by the common rotation axis 5, the rotation axes of the carriage 3A and the reaction base 21 coincide with each other, and the rigidity of the shaft is increased. is there.

Further, one end 35 of the rotating shaft 5 can be fixed to the cover 34 shown in FIG. 3 by a screw or an adhesive. Thus, the rotating shaft 5 is supported at both ends, and the carriage 3A and the reaction base 21 can be supported with high rigidity. Therefore, there is an advantage that even when the device is placed vertically, the effect of the bending force and the translational force on the rotating shaft 5 during operation can be made the same as that in the case of the horizontal placement.

Further, in the present embodiment, the two voice coils 4A are arranged symmetrically with respect to the position of the center of gravity of the carriage 3A, so that the center of support and the center of gravity of the carriage 3A supported by the bearings 19A and 19B are shifted. Since the carriage 3A is driven by a pair of symmetrically arranged voice coils 4A and 4A, vibration of the rotary shaft 5 due to carriage operation is less likely to occur. As a result, the displacement of the head and the fluctuation of the flying height of the head due to the vibration of the carriage rotating shaft can be extremely reduced, and high-speed and high-precision head positioning can be realized.

The reaction base 21 is supported by a damping mechanism in the rotation direction. The damping mechanism includes a projection 30 disposed between the notches 33 of the reaction base and viscoelastic damping members 29A and 29B disposed on both sides of the projection 30. The damping members 29A and 29B are bonded between the side surface of the projection 30 fixed on the base 9 and the side surface of the notch 33 of the reaction base, and as shown in FIG. 21 and the shaded area 3
1B is bonded to the projection 30. When the carriage is driven, the voice coil motor magnetic circuit 6 shown in FIG. 6 receives the reaction of the carriage driving force and causes the reaction base 21 to slightly rotate and vibrate. However, since the above-described damping mechanism is provided, the movement of the reaction base 21 is suppressed by the damping mechanism, and the exciting force to the base 9 due to the driving of the carriage is effectively reduced.

Here, the deformation pattern of the damping material will be described with reference to FIG. In FIG. 8, if the reaction base 21 moves in the direction of arrow d, for example, under the reaction of the carriage driving force, the damping material 29A provided between the reaction base 21 and the projection 30 is compressed, and 29B is pulled. . FIG. 9 shows how the damping materials 29A and 29B are deformed. FIG. 9 is a diagram viewed from the direction c in FIG. As you can see from this figure,
A force acts on the damping material in the direction of the arrow, and the damping material 29A,
9B receives a compressive force and a tensile force, respectively. As described above, since both the compressive force and the tensile force act on the damping material at the same time, the spring reaction force of the damping material is almost equal regardless of the direction of rotation of the reaction base 21 in any direction, and a stable damping effect is always obtained. .

Next, the arrangement of the damping mechanism will be described with reference to FIG. In the figure, the head 1 is located at the midpoint of the moving distance on the disk 8. In the present embodiment, four damping mechanisms are constituted by the projections 30 and the damping members 29 arranged between the notches of the reaction base. That is, one voice coil motor 6A is provided outside the magnetic circuit 6A.
B, one outside of B, and 2 perpendicular to the line connecting them
Are placed. However, the damping mechanism may be only one constituted by the projection 30 and the damping materials 29A and 29B. In addition, one formed by the protrusion 30 and the damping materials 29A and 29B, and the protrusion 30 and the damping materials 29E and 29F
May be constituted by a total of two damping mechanisms. Further, the protrusion 30 and the damping material 29
C, 29D, and one composed of the protrusion 30 and the damping materials 29G, 29H, for a total of 2
It may be constituted by a plurality of damping mechanisms. Furthermore,
It may be constituted by three damping mechanisms excluding the damping mechanism by the projection 30 and the damping materials 29E and 29F. This means that the damping mechanism only needs to be arranged symmetrically with respect to the rotating shaft 5, and a more stable damping effect can be obtained by this symmetrical arrangement.

The damping material may generate dust due to repetition of compression and tension. Then, when dust is generated in the apparatus, the dust adheres to the information recording disk and interferes with reading and writing of signals. Therefore, it is more preferable to apply a coating to the damping material so as to suppress dust generation.

Another embodiment of the damping mechanism will be described with reference to FIG. The reaction base is divided into two portions, 21A and 21B, in the thickness direction. The damping material 29 is provided between the lower yoke 15B of the voice coil motor and the reaction base 21A, and between the reaction base 21A and the reaction base 21B.
And it is arrange | positioned in lamination | stacking between the reaction base 21B and the base 9. FIG. With such a configuration, transmission of the driving reaction force of the carriage 3A to the base 9 can be reduced. Incidentally, the damping material may be provided on the entire surface of the reaction base or may be provided on a part thereof.

In the above-described embodiment, the bearing for supporting the reaction base is provided on the rotary shaft of the carriage. However, the method of supporting the reaction base for matching the rotation axis of the carriage and the reaction base is not limited to this. That is, in another embodiment shown in FIG. 12, the reaction base 21 is rotatably supported by a large-diameter rolling bearing 20 provided on the base 9.

Hereinafter, the ratio of the moment of inertia around the rotation shaft 5 on the working side (same as the working part) and the reaction side (same as the reaction part) of the drive unit in the above-described various structures will be described. Here, the action side, that the carriage 3A, a portion of the bearing 19, the coil holder 3B, the drive coils 4A, the moment of inertia of the rotation axis of the portion consisting of the I _1. on the other hand,
Reaction side, that is, reaction base 21, part of bearing 20, upper yoke 15A, lower yoke 15B, upper permanent magnet 16
A, 16B, the lower the permanent magnet 16C, 16D, the moment of inertia of the rotation axis of the part made of a I _2. This I ₂
And reduction of the excitation force of the ratio I ₂ / I ₁ of I ₁ to configuration in which 10 or more to the base 9 due to the driving of the carriage 3A is particularly large. Therefore, in order to adjust the inertial mass, an additional mass 32B is mounted on the reaction base 21 as shown in an example in FIG.
A may be attached. Alternatively, a method of increasing the volumes of the upper yoke 15A and the lower yoke 15B instead of attaching the additional mass may be used. On the other hand, due to the mounting of the device,
Since there is a limit to the mass increase on the reaction side, the reaction base 2
1 or additional masses 31A to 32B
A method using a material having a specific gravity larger than A may be adopted.

Although several examples of the structure for reducing the transmission of the driving reaction force of the carriage 3A to the base 9 have been described above, an active configuration other than these is also possible.
That is, although not shown, the spring constant and the viscous damping coefficient of the damping material may be variably set from outside the apparatus based on, for example, a positioning command value of the carriage.

As is clear from the above description, in this embodiment, all the mechanical elements are arranged on one side 9 of the base 29, and these elements can be assembled in order from the bottom. In addition, the entire device is made thinner, and the assemblability is greatly improved.

FIG. 13 shows the effect of the present invention. In a conventional apparatus, as (a), when driving the carriage giving carriage target angular velocity, even though the carriage is stopped at time t _2, the residual vibration is generated in the base as shown in (b) . Also, as shown in (e),
Residual vibration in the radial direction of the carriage rotating shaft also occurs. However, according to the present invention, since the reaction energy of the carriage drive is consumed by the reaction base damping mechanism, the time t ₂
When the carriage stops, the residual vibration of the reaction base is very small as shown in FIG. 3C, and the vibration acceleration of the base is also small as shown in FIG. That is, the exciting force to the disk is reduced, and the relative displacement at the time of positioning between the base and the disk is reduced. In addition, the center of gravity of the carriage and the center of gravity of the reaction base receiving the carriage driving reaction force coincide with the center of rotation, respectively, and the center of support and the center of gravity of the carriage coincide with each other. Since the carriage is rotationally driven by the force, the rotation axis of the carriage is hardly vibrated by the operation of the carriage, and the vibration acceleration in the radial direction of the carriage rotation axis is small as shown in FIG. As a result, the displacement of the head and the fluctuation of the flying height of the head can be reduced very effectively.

FIG. 15 shows an embodiment of active drive in which the driving force of the reaction base 21 is realized by a motor. FIG. 16 shows FIG.
17 is a sectional view taken along the line BB 'of FIG. In each figure, the reaction base 21 is driven by two sets of voice coil motors 24A for driving the reaction base. The reaction base driving voice coil motor 24A includes a voice coil 4B, a permanent magnet 16E, and a yoke 15C. Voice coil 4B
Is bonded to the side surface of the reaction base 21, and the yoke 15C to which the permanent magnet 16E is bonded is fixed to the base 9 by screws or bonding. FIG. 18 shows how the thrust is generated by the voice coil motor 24A for driving the reaction base. The example shown here is in principle a voice coil motor 2 for driving the carriage.
4, the detailed description is omitted. Recoil base 21
When a current I is applied to the voice coil 4B bonded to the voice coil 4B (not shown) in the direction of the arrow in the figure, a thrust is generated in the voice coil 4B in the direction of the arrow F. The configuration of the actuator for driving the reaction base 21 is not limited to this.
In the embodiment shown in FIG. 17, a thrust generating surface is provided on the outer peripheral surface of the reaction base 21. However, as shown in FIG. The drive may be performed by providing a thrust generating surface on the bottom surface.

Returning to FIG. 15, when the carriage 3A is driven in the direction of arrow a, the voice coil motor 2
The magnetic circuit 6 of 4A receives the reaction force and tries to rotate in the direction of arrow b. Therefore, if the reaction base 21 is actively driven in the direction of arrow a, which is the same as the rotational driving direction of the carriage 3A, in synchronization with the movement of the carriage 3A, the driving reaction force of the carriage 3A applied to the base 9 is eliminated, and the base is almost completely removed. External rotation of the disk drive motor 10, which does not rotate and hinders positioning, can be reduced.

[0051] The moment of inertia of the rotation axis of the rotatable portion around the carriage 3A and I _1, recoil base 2
1, the moment of inertia of the rotation axis of the reaction unit with a focus on the magnetic circuit 6 of the voice coil motor 24A and I _2.
It is assumed that the carriage 3A is rotated by bang-bang driving with the acceleration time t ₁ and the deceleration end time t ₂ . When the carriage 3A is driven at the target angular velocity shown in FIG. 20A, the reaction base 21 is moved as shown in FIG.

_Equation 1 θ _2max = (I ₁ / I ₂ ) θ _{1max where} θ _1max ‥‥ the maximum value of the carriage target angular velocity θ _2max ‥‥ the maximum value of the reaction base target angular velocity. If the carriage 3A is driven in the same direction as the rotation direction of the carriage 3A at a certain angular velocity, the carriage 3A
Can be eliminated. As a result, as shown in (e), the rotational movement of the reaction base 21 is reduced, and the excitation of the disk rotation drive motor 10 is reduced by the conventional drive reaction force of the carriage 3A.

Therefore, as shown in FIG.
1 is detected by the reaction base rotation angle detector 26, and the reaction base 21 is synchronized with the movement of the carriage 3A.
To prevent the disk rotation drive motor 10 from being excited by the reaction force of the carriage 3A.

[0053]

According to the present invention, the vibration of the rotating shaft during driving of the carriage is effectively prevented, and the excitation force due to the reaction force accompanying the carriage driving is effectively prevented from being transmitted to the base. Can be positioned at a higher speed and with higher accuracy.

Further, according to the present invention, the rigidity of the rotary shaft shared between the working side and the reaction side is increased, so that the rotating shaft can be used in almost the same state as that in the case of using horizontally. Become.

Further, according to the present invention, the entire device is made thinner and its assembly is further facilitated.

In addition, in order to actively drive the reaction base to rotate minutely in synchronization with the rotational movement of the carriage in the same direction as the rotational drive direction of the carriage in accordance with the length of the positioning command distance of the carriage, the base is driven by the carriage operation. The transmission of the reaction force to the disk is reduced, the exciting force to the disk is also reduced, and the relative displacement during positioning between the head and the disk is reduced. As described above, high-speed and high-accuracy positioning of the head can be performed.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of an embodiment of a rotary information recording / reproducing apparatus according to the present invention.

FIG. 2 is a plan view of the embodiment in which a cover of a mechanical system portion is removed.

FIG. 3 is a side view of FIG. 2 viewed from the direction of arrow A, with a cover removed.

FIG. 4 is a sectional view taken along the line BB ′ of FIG. 2;

FIG. 5 is a partial cross-sectional view of the voice coil motor as viewed from the direction of arrow C in FIG. 2;

FIG. 6 is a configuration diagram of a reaction base and a damping mechanism.

FIG. 7 is a diagram showing an adhesive surface of the damping material.

FIG. 8 is a diagram showing a pattern of deformation of the damping material.

9 is a view showing a pattern of deformation of the damping material, and is a view as viewed from an arrow c in FIG. 8;

FIG. 10 is a plan view of another embodiment of the rotary information recording / reproducing apparatus according to the present invention, in which a cover is partially removed.

FIG. 11 is a partial sectional view of another embodiment of the rotary information recording / reproducing apparatus according to the present invention.

FIG. 12 is a partial sectional view of another embodiment of the rotary information recording / reproducing apparatus according to the present invention.

FIG. 13 is a diagram showing an effect of the present invention.

FIG. 14 is an example of a conventional magnetic disk drive.

FIG. 15 is a plan view of the embodiment in which a cover of a mechanical system portion is removed.

FIG. 16 is a side view, partially viewed from the direction of arrow A in FIG. 15, with a cover removed;

17 is a sectional view taken along the line BB 'of FIG.

18 is a partial cross-sectional view of the voice coil motor as viewed from the direction of arrow C in FIG.

FIG. 19 is a sectional view showing another embodiment of the embodiment shown in FIG. 17;

FIG. 20 is a reaction base drive diagram of the present embodiment.

[Explanation of symbols]

 Reference Signs List 1 head 2 head support spring 3A carriage 3B voice coil holder 4A voice coil 4C left wire bundle of voice coil 4D right wire bundle of voice coil 5 rotation axis 6 voice coil motor magnetic circuit 7 voice coil motor magnetic circuit gap 8 disk 9th 1 base 10 disk rotation drive motor 11 housing 15A upper yoke 15 15B lower yoke 15 15C yoke 16A, 16B upper permanent magnet 16C, 16D lower permanent magnet 16E permanent magnet 17 collar 18 screw 19A, 19B rolling bearing 20 bearing 21A, 21B Second Base 22 Electric Circuit Board 23 Flexible Printed Circuit (FPC) 24, 24A Voice Coil Motor 25 Reaction Base Rotation Angle Detector 26 Microcomputer 27 Magnetic Head Prian 28 Connector 29 Damping material 30 Protrusion 31 Damping material bonding surface 32A, 32B Additional mass 33 Reaction base notch 38 Reaction base hole 39 Base surface supporting mechanical elements

──────────────────────────────────────────────────の Continuing from the front page (72) Inventor Hirotake Hirai 502 Kandachi-cho, Tsuchiura-shi, Ibaraki Pref.Hitachi, Ltd.Mechanical Research Laboratory Co., Ltd. (72) Inventor Yasuo Yamamoto 2880 Kozu, Odawara City, Kanagawa Prefecture Inside the Odawara Plant, Hitachi, Ltd. (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B 21/02

Claims (15)

(57) [Claims] An information recording / reproducing head mounted on the carriage includes a driving unit including an operating portion and a reaction portion disposed on a first base, a carriage driven by the driving unit, and an information recording / reproducing head mounted on the carriage. In a rotary information recording / reproducing apparatus for recording / reproducing information on a disk to be recorded, an operation portion of the driving unit is fixed to a carriage, and a reaction unit of the driving unit is rotatable coaxially with a rotation axis of the carriage. It is fixed to the base, and a damping mechanism is interposed between the first base and the second base. The damping mechanism engages with a notch formed in the second base and the notch. A projection formed on the first base;
A rotary information recording / reproducing apparatus comprising: a viscoelastic member symmetrically disposed on both sides of the projection so as to fill a gap between the projection and the notch. 2. The rotary information recording / reproducing apparatus according to claim 1, further comprising a plurality of attenuating mechanisms, wherein the plurality of attenuating mechanisms are arranged so as to be located inside an outer periphery of the driving means. 3. A driving means comprising an operating part and a reaction part disposed on a first base, a carriage driven by the driving means, and an information recording / reproducing head mounted on the carriage. In a rotary information recording / reproducing apparatus for recording / reproducing information on a disk to be recorded, an operation portion of the driving unit is fixed to a carriage, and a reaction unit of the driving unit is rotatable coaxially with a rotation axis of the carriage. Rotary-type information in which a viscoelastic member is arranged in a stacked manner between the reaction portion of the driving means fixed on the base and the second base and the second base and between the first base and the second base. Recording and playback device. 4. The rotary information recording / reproducing apparatus according to claim 3, wherein the second base is divided into a plurality of portions in a thickness direction, and a viscoelastic member is also arranged between the divided portions in a stacked manner. 5. The rotary information recording / reproducing apparatus according to claim 1, wherein the second base is rotatable via a bearing mounted on a rotary shaft shared with the action section. . 6. The carriage according to claim 1, wherein the second base is rotatable coaxially with a rotation shaft of the carriage via a rolling bearing provided on the first base. Rotary information recording / reproducing device. 7. A method according to claim 7, further comprising: providing a plurality of driving means, fixing a reaction portion of each driving means to a second base,
2. The rotary type according to claim 1, wherein the first base and the working side including the carriage of each driving means are independently rotatable about a rotation shaft erected on the first base. Information recording and playback device. 8. The rotary information recording / reproducing apparatus according to claim 1, wherein an upper end of the rotary shaft is fixed to a cover. 9. A rotary information device for positioning an information recording / reproducing head mounted on the carriage with respect to a disk by rotating the carriage by driving means comprising an operating portion and a reaction portion disposed on the first base. In the recording / reproducing apparatus, a reaction portion of the driving means is rotatable coaxially with the operation portion and independently of the operation portion, and an inertia moment of the reaction portion is increased by adding an additional mass to the reaction portion. 8. The rotary information recording / reproducing apparatus according to 7. 10. The rotary information recording / reproducing apparatus according to claim 9, wherein the member or additional mass of the reaction portion is formed of a material having a specific gravity greater than that of the member of the action portion. 11. The rotary information recording / reproducing apparatus according to claim 9, wherein the second base is rotatable via a bearing attached to a rotating shaft shared with the action section. . 12. The carriage according to claim 9, wherein the second base is rotatable coaxially with a rotation shaft of the carriage via a rolling bearing provided on the first base. Rotary information recording / reproducing device. 13. A rotary information recording / reproducing apparatus comprising a driving means comprising a working part and a reaction part disposed on a first base, and a carriage driven by the driving means, wherein the reaction of the driving means is synchronized with the movement of the carriage. A driving unit for minutely driving the unit in a carriage rotation direction. 14. The apparatus according to claim 13, wherein a second base for fixing the reaction portion of the driving means is provided, and the actuator as the minute driving means is formed in a portion including the outer peripheral portion and the outer peripheral portion of the second base. Rotary information recording / reproducing device. 15. The rotary information recording / reproducing apparatus according to claim 13, wherein the actuator as the minute driving means is formed in a portion including the opposing surfaces of the first base and the second base.