JP3271168B2 - Rotary drum device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[Table of Contents] The present invention will be described in the following order. Industrial Application Conventional Technology (FIGS. 10 to 13) Problems to be Solved by the Invention (FIGS. 10 to 13) Means for Solving the Problems (FIGS. 1, 2, 3, 7,
8 and 9) Function (FIGS. 1, 2, 3, 7, 8 and 9) Example (FIGS. 1 to 9) Effects of the Invention

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary drum device,
This is to further improve the accuracy of the head rotation trajectory.

[0003]

2. Description of the Related Art Conventionally, a video tape recorder (VTR)
In such a case, the magnetic head is mounted on a predetermined rotary drum device and rotated, so that the magnetic head is formed on a recording track formed obliquely to the longitudinal direction of the magnetic tape running while being wound around the rotary drum device. A predetermined video signal is recorded and / or reproduced via the.

[0004] As such a rotary drum device, first, there is a middle drum type in which a middle drum provided between a fixed upper drum and a fixed lower drum is rotated. That is, FIG.
1A and 1B show a top view and a side view of a rotary drum device 1 of a middle drum type. A cylindrical fixed upper drum 3 is fastened to a support member 2 by screws 7A and 7B. A cylindrical fixed lower drum 4 is fastened to the member 2 by screws 8A and 8B.

A rotating drum 11 is rotatably supported between the fixed upper drum 3 and the fixed lower drum 4, and slightly protrudes from the peripheral side of the rotating drum 11 during rotation.
2 is fixed. During rotation, the drum 3 is driven to rotate by a drive motor 6, and accordingly, the magnetic head 12 rotates between the fixed upper drum 3 and the fixed lower drum 4.

At this time, the magnetic tape (not shown) travels obliquely along the outer peripheral side surfaces of the fixed upper drum 3 and the fixed lower drum 4 on the rotation trajectory of the magnetic head 12 fixed to the drum 11 during rotation. In addition, a recording track can be formed on the magnetic tape sequentially and diagonally in the longitudinal direction.

FIG. 11 is a sectional view of the rotary drum device 1, in which a transformer housing 4A is formed below the fixed lower drum 4, and a stator 13A of the rotary transformer 13 is fixed in the transformer housing 4A. Have been. A cylindrical bearing holding portion 4B is formed in communication with the transformer housing 4A, and the rotating shaft 14 is rotatably supported via bearings 15A and 15B held by the bearing holding portion 4B.

A rotary shaft 14 has a flange 16 fitted and fixed thereto.
The third drum 13B is fixed, and the rotating drum 11 is fixed to the upper surface of the flange 16. Accordingly, by rotating the rotating shaft 14 by the driving motor 6 provided at the lower end of the rotating shaft 14,
The rotor 13B of the rotary transformer 13 and the rotating drum 11 can be driven to rotate.

A head substrate 21 is fastened to the peripheral portion of the rotating drum 11, and the magnetic head 12 is fixed via the head substrate 21. The height of the magnetic head 12 can be finely adjusted by an adjusting screw 22.

Thus, by arranging the magnetic head 12 to protrude outside from the gap between the fixed upper drum 3 and the fixed lower drum 4, the magnetic head 12 slides on the outer peripheral side surface via a magnetic head (not shown). A predetermined video signal or the like can be recorded or reproduced.

Second, there is an upper drum type rotary drum device for rotating an upper drum provided on a fixed lower drum. That is, FIG. 12, in which parts corresponding to those in FIG. 10 are assigned the same reference numerals, shows a side view of the upper drum type rotary drum device 30.
Is rotatably supported, and the magnetic head 12 is fixed to the upper rotating drum 33 so as to slightly protrude from the peripheral side thereof. The upper rotating drum 33 is driven to rotate by the drive motor 6, and the magnetic head 12 is accordingly driven by the upper rotating drum 33.
And rotate together.

At this time, the magnetic tape (not shown) travels obliquely along the outer peripheral side surfaces of the upper rotating drum 33 and the lower fixed drum 4 on the rotation trajectory of the magnetic head 12 fixed to the upper rotating drum 33. In addition, a recording track can be formed on the magnetic tape sequentially and diagonally in the longitudinal direction.

FIG. 13 in which parts corresponding to those in FIG. 11 are assigned the same reference numerals is a sectional view of the rotary drum device 30.
A transformer case 4A is formed on the lower side of the fixed lower drum 4, and a stator 13A of the rotary transformer 13 is fixed in the transformer case 4A. Transformer housing 4
A cylindrical bearing holding portion 4B is formed in communication with A, and the rotating shaft 14 is rotatably supported via bearings 15A and 15B held by the bearing holding portion 4B.

A rotary shaft 14 has a flange 16 fitted and fixed thereto.
The third rotor 13B is fixed, and the upper drum 33 is fixed to the upper surface of the flange 16. Accordingly, by rotating the rotating shaft 14 by the driving motor 6 provided at the lower end of the rotating shaft 14,
The rotor 13B of the rotary transformer 13 and the rotary drum 33 can be driven to rotate.

A head substrate 21 is fastened to a peripheral portion of the rotating upper drum 33, and the magnetic head 12 is fixed via the head substrate 21. The height of the magnetic head 12 can be finely adjusted by an adjusting screw 22.

Thus, the magnetic head 12 is disposed on the fixed lower drum 4 so as to protrude to the outside and is rotated, so that a magnetic tape (not shown) slidably contacting the outer peripheral side surface is provided with a predetermined image via the magnetic head. A signal or the like can be recorded or reproduced.

[0017]

By the way, in the rotary drum devices 1 and 30 having such a structure, when the magnetic tape is slid, the coefficient of friction with respect to the magnetic tape becomes particularly large in the fixed upper drum. Had the problem of causing damage.

Further, when the magnetic tape is left wound around the rotary drum device 1 or 30 for a long time, when used in a high-humidity environment, or when used in a place having a large temperature difference, dew condensation or the like may occur. When the magnetic tape starts running in this state, the magnetic tape is cut, and the magnetic tape is damaged.

The present invention has been made in view of the above points, and it is an object of the present invention to propose a rotary drum device capable of preventing abrasion and damage of a tape-shaped recording medium.

[0020]

According to the present invention, a predetermined signal is transmitted to a tape-shaped recording medium that is in sliding contact with the head 12 by rotating the head 12 fixed on the rotary drum 41. In the rotary drum device 140 for recording and / or reproducing, the support member 1 for fastening the first rotary shaft holding member 43 and the second rotary shaft holding member 4
42, a first rotating shaft 44 rotatably supported by a first rotating shaft holding member 43, and a first rotating shaft rotatably supported by a second rotating shaft holding member 4. A second rotating shaft 14 divided into the first rotating shaft 44 and a synchronization unit 47 for matching the rotating operations of the first rotating shaft 44 and the second rotating shaft 14 with each other;
A rotating drum 41 having a head 12 engaged with and fixed to the rotating shaft 44 of the first rotating shaft 44, and adjusting means 142, 142A, 14 for adjusting the horizontality and vertical displacement of the first rotating shaft holding member 43.
2B, 142C, 142D, 152, 157A, 157
B, 175 and adjusting means 142, 142A, 142B,
142C, 142D, 152, 157A, 157B, 1
The first rotating shaft holding member 4
Vibration generating means 179 for continuously giving micro vibration to 3
By continuously applying micro-vibration to the first rotating shaft holding member 43, the first rotating shaft holding member 43
The friction coefficient of the tape-shaped recording medium that slides on the recording medium is reduced.

According to the present invention, in a rotary drum device 140 for recording and / or reproducing a predetermined signal on a tape-shaped recording medium slidably contacting the head 12 by rotating the head 12 fixed on the rotary drum 41, A support member 142 for fastening the first rotation shaft holding member 43 and the second rotation shaft holding member 4, a first rotation shaft 44 rotatably supported by the first rotation shaft holding member 43, A second rotating shaft 14 rotatably supported by the second rotating shaft holding member 4 and divided with respect to the first rotating shaft 44;
A synchronization means 47 for matching the rotation operations of the fourth and second rotating shafts 14 and a first rotating shaft 44 which are fixedly engaged with each other;
Drum 41 having a rotating shaft 2 and first rotating shaft holding member 4
Adjusting means 142 for adjusting the degree of horizontality and the degree of vertical displacement of No. 3;
142A, 142B, 142C, 142D, 152, 1
57A, 157B, 175 and adjusting means 142, 142
A, 142B, 142C, 142D, 152, 157
A, 157B, and 175 are vibrated at a predetermined timing, so that a vibration generating unit 179 applies vibration to the first rotating shaft holding member 43 at the start of running of the tape-shaped recording medium that slides on the first rotating shaft holding member 43. The tape-shaped recording medium attached to the first rotating shaft holding member 43 is peeled off when the tape-shaped recording medium starts running.

In the present invention, the synchronizing means includes the first synchronizing means.
The flexible joint 47 connects the rotating shaft 44 and the second rotating shaft 14.

[0023]

The friction coefficient of the tape-shaped recording medium that slides on the first rotating shaft holding member 43 can be reduced by continuously vibrating the first rotating shaft holding member 43 finely.

When the tape-shaped recording medium slidingly in contact with the first rotating shaft holding member 43 starts running, the first rotating shaft holding member 43 is vibrated to adhere to the first rotating shaft holding member 43. The tape-shaped recording medium can be peeled off. Thus, wear and breakage of the tape-shaped recording medium can be prevented.

[0025]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

In FIG. 1 in which parts corresponding to those in FIG.
The upper fixed drum 43 is fastened to the support member 142 by screws 7A.

A cylindrical bearing holding portion 43A is formed on the fixed upper drum 43, and a rotating shaft 44 is rotatably supported via bearings 45A and 45B held by the bearing holding portion 43A. .

At the lower end of the rotating shaft 44, a cylindrical fitting portion 46B formed at the center of the flange 46 is fitted and fixed. Mounting surface (upper surface) 4 of this flange 46
The drum 41 is fixed to 6A during rotation. A head substrate 21 is fastened to the peripheral side of the rotating drum 41, and the magnetic head 12 is connected via the head substrate 21.
Has been fixed. The magnetic head 12 has an adjusting screw 22
The height can be fine-adjusted by using. Thus, the magnetic head 12 of the drum 41 rotating integrally with the rotating shaft 44
Can be rotated.

Here, the rotating shaft 44 provided on the fixed upper drum 43 side and the rotating shaft 14 provided on the fixed lower drum 4 side are connected by flexible joints 47, respectively. Drive and rotate 1
When rotating the rotating shaft 4, the rotating shaft 44 can be rotated integrally therewith. Thus, by driving the drive motor 6, the magnetic head 12 can be rotated via the rotating shafts 14, 44 and the rotating drum 41.

The fixed upper drum 43 and the fixed lower drum 4
The support member 142 for supporting the two
And 142D, and notches 142A and 14D communicating with the slit 142C as shown in FIG.
2B is formed.

Accordingly, the upper drum fixing block 142E for supporting the fixed upper drum 43 by the slit 142C and the lower drum fixing block 142F for supporting the fixed lower drum 4 are provided.
The upper drum fixing block 142E and the lower drum fixing block 142F are notched 142A and 14C.
It is connected by a connecting portion 159 formed between 2B.

A support hole 160A is formed in the upper surface of the notch 142A in the vertical direction.
A cylindrical actuator 157A is provided in A. The lower end of the piezoelectric actuator 157A contacts the bottom surface of the notch 142A, and the upper end of the piezoelectric actuator 157A contacts the screw 158A screwed into the screw hole 155A, thereby being fixed between the bottom surface of the notch 142A and the screw 158A. ing.

A support hole 160B is formed in the upper surface of the notch 142B in the vertical direction.
A cylindrical piezoelectric actuator 157B is provided in B. The lower end of the piezoelectric actuator 157B contacts the bottom surface of the notch 142B, and the upper end of the piezoelectric actuator 157B contacts the screw 158B screwed into the screw hole 155B, thereby being fixed between the bottom surface of the notch 142B and the screw 158B. ing.

The piezoelectric actuators 157A and 157B
Are adapted to expand and contract in the longitudinal direction (the direction of the arrow d or the direction opposite thereto) in accordance with the applied voltage value. Accordingly, the piezoelectric actuators 157A and 157
3B, the piezoelectric actuator 157A is contracted and the piezoelectric actuator 157B is extended, as shown in FIG.
The upper drum fixing block 42E about the fulcrum O ₂ 59 tilts in the direction indicated by the arrow a.

On the other hand, the piezoelectric actuator 157A
Than to shorten the piezoelectric actuator 157B with stretch, the upper drum fixing block 42E about the fulcrum O ₂ of the coupling portion 159 is inclined in the opposite direction to the direction indicated by the arrow a.

As a result, as shown in FIG. 4 in which the support member 42 in FIG. 3B is viewed as a rotary drum device 140 from the opposite side of the drawing, the fixed upper drum 43 is in a horizontal state (FIG. 4A).
When the upper drum fixing block 142E (FIG. 3B) is tilted in the direction of the arrow a by the piezoelectric actuators 157A and 157B, the fixed upper drum 43 fixed to the fixing block 142E responds in the direction of the arrow a. Tilt (FIG. 4B). Accordingly, the rotating drum 41 integrated with the rotating shaft 44 (FIG. 1) of the fixed upper drum 43 also tilts in the direction of arrow a together with the fixed upper drum 43. As a result, the magnetic head 12 fixed to the rotating drum 41 is rotated. The trajectory can be inclined with respect to a magnetic tape (not shown) slidingly contacting the peripheral side surfaces of the fixed upper drum 43 and the fixed lower drum 4.

The piezoelectric actuators 157A and 157A
7B, the upper drum fixing block 142E (FIG. 3)
When (B) is tilted in the direction opposite to the arrow a, the upper fixed drum 43 fixed to the fixed block 142E tilts in the direction opposite to the arrow a accordingly (FIG. 4C).
Accordingly, the rotating drum 41 integrated with the rotating shaft 44 (FIG. 1) of the fixed upper drum 43 also tilts in the opposite direction to the arrow a together with the fixed upper drum 43.
The trajectory of the magnetic head 12 fixed to 1 can be inclined with respect to a magnetic tape (not shown) slidingly contacting the peripheral side surfaces of the fixed upper drum 43 and the fixed lower drum 4.

By adjusting the amount of expansion and contraction of the piezoelectric actuators 157A and 157B (FIG. 3B) in accordance with the voltage applied thereto, the locus of the magnetic head 12 with respect to the magnetic tape is inclined in the azimuth direction. Can be. Incidentally, such adjustment in the azimuth direction is referred to as horizontality adjustment.

In FIG. 2, the support member 142 is connected to a lower drum fixing block 142F for fixing the fixed lower drum 4 and an upper drum fixing block 142E for fixing the fixed upper drum 43 by a slit 142D formed in a vertical direction. It is divided into a tilt adjustment block 142G via a connecting portion 165.

A support hole 160C communicating with the lower drum fixing block 142F is formed in the tilt adjustment block 142G, and the piezoelectric actuator 152 is formed in the support hole 160C by a screw 153 screwed into a screw hole 161.
Is held. By controlling the voltage value applied to the piezoelectric actuator 152, the piezoelectric actuator 152 can be expanded and contracted.

Accordingly, by extending the piezoelectric actuator 152, the tilt adjustment block 142G approaches the lower drum fixing block 42F (the direction of the arrow b).
And the piezoelectric actuator 152 is shrunk to reduce the tilt adjustment block 142.
G can be displaced in a direction away from the lower drum fixing block 142F (the direction opposite to the arrow b).

Accordingly, as shown in FIG. 1, when the tilt adjustment block 142G is displaced by the piezoelectric actuator 152 in the direction of the arrow b with respect to the lower drum fixing block 142F, the upper block is connected to the tilt adjustment block 142G. The fixed upper drum 43 can be displaced via the drum fixing block 142E. This fixed upper drum 4
The displacement direction of _No. 3 is a direction indicated by an arrow c around the fulcrum O1 of the coupling portion 165 of the support member 142.

On the other hand, when the tilt adjustment block 142G is displaced by the piezoelectric actuator 152 in the direction opposite to the arrow b with respect to the lower drum fixing block 142F, the upper tilt adjustment block 142G is connected to the tilt adjustment block 142G. The fixed upper drum 43 can be displaced via the drum fixing block 142E. This fixed upper drum 4
3 is the fulcrum O of the coupling portion 65 of the support member 142.
_The direction is opposite to the arrow c with ₁ as the center.

As a result, as shown in FIG. 5 in which the support member 42 in FIG. 3B is viewed as a rotary drum device 140 from the opposite side of the drawing, the fixed upper drum 43 is in a horizontal state (FIG. 5A).
When the fixed upper drum 43 is displaced in the direction of arrow c by the piezoelectric actuator 152 (FIG. 5B), the rotation shaft 44 of the fixed upper drum 43 (FIG. 1) is correspondingly changed.
The rotating drum 41 integrated with the upper drum 43 also tilts in the direction of arrow c together with the fixed upper drum 43, and as a result, the trajectory of the magnetic head 12 fixed to the rotating drum 41 Can be displaced upward with respect to a magnetic tape (not shown) that slides on the magnetic tape.

The fixed upper drum 43 is in a horizontal state (FIG. 5).
In FIG. 5A, when the fixed upper drum 43 is displaced in the direction opposite to the arrow c by the piezoelectric actuator 152 (FIG. 5C), the rotating shaft 44 of the fixed upper drum 43 (FIG. The rotating drum 41 integrated in 1) also tilts in the opposite direction to the arrow c together with the fixed upper drum 43,
As a result, the magnetic head 12 fixed to the drum 41 during rotation is rotated.
Can be displaced downward with respect to a magnetic tape (not shown) slidingly contacting the peripheral side surfaces of the fixed upper drum 43 and the fixed lower drum 4.

By adjusting the amount of expansion and contraction of the piezoelectric actuator 152 (FIG. 1) as described above, the trajectory of the magnetic head 12 with respect to the magnetic tape can be translated in the vertical direction (tilt direction). Incidentally, such adjustment in the tilt direction is referred to as vertical displacement degree adjustment.

Here, as shown in FIG.
A region where the magnetic head 12 is not provided on the lower side surface 41C of the drum 41 during the rotation of 40 is mirror-finished, and a distance sensor 171C is fixed to a position of the fixed lower drum 4 facing the lower side surface 41C. . The distance sensor 171C includes a laser diode for irradiating the lower surface 41C of the rotating drum 41 with laser light, and a lower surface 41C.
A light receiving unit that receives the laser light reflected at C and detects the distance between the distance sensor 171C and the lower side surface 41C according to the light receiving position, and is located at the light receiving position of the reflected laser light (that is, the distance from the lower side surface 41C). The detection output having the corresponding voltage level is sent to the control unit.

In the rotary drum device 140, the distance sensor 1 having the same configuration as the distance sensor 171C having the above configuration is used.
71A and 171B are fixed to the fixed lower drum 4. The arrangement of each of the distance sensors 171A, 171B and 171C is shown in FIG.
, Distance sensors 171A and 171C
Is the rotation center of the rotating drum 41 (that is, the rotating shaft 44)
, And the distance sensor 171B is arranged at a position separated by 90 degrees from the distance sensors 171A and 171C.

Also, on the straight line passing through the distance sensors 171A and 171C, the connecting portion 159 of the support member 142 shown in FIG.
And the piezoelectric actuators 157A and 157A
When the rotating drum 41 is adjusted in azimuth by 57B and when the rotating drum 41 is displaced in the azimuth direction, the detection outputs of the distance sensors 171A and 171C do not change, and the rotating drum 41 is controlled by the piezoelectric actuator 152. The detection outputs of the distance sensors 171A and 171C change when the tilt is adjusted (the vertical displacement is adjusted) and when the drum 41 is displaced in the tilt direction during rotation.

The output of the distance sensor 171B changes when the rotating drum 41 is tilted by the piezoelectric actuator 152 and when the rotating drum 41 is displaced in the tilting direction.

Accordingly, only the displacement of the rotating drum 41 in the tilt direction can be detected by the detection outputs of the distance sensors 171A and 171C, and the distance sensor 171 can be detected.
Only the displacement of the rotating drum 41 in the azimuth direction (that is, the levelness) can be detected by the detection output of B.

FIG. 7 shows the distance sensors 171A and 171.
B and 171C show a piezoelectric actuator control circuit 175 for controlling the applied voltage to each of the piezoelectric actuators 152, 157A and 157B based on the respective detection outputs;
The detection output V11 output from the distance sensor 171C is supplied to the control amplifier AM via the sensor amplifier AMP12.
It is input to the non-inverting input terminal of P14.

The control amplifier AMP14 inputs the detection output V13 of the distance sensor 171A to the inverting input terminal, and uses the difference between the detection outputs of the distance sensors 171A and 171C as the error voltage V19 to generate the voltage driver AMP17.
Input to the non-inverting input terminal.

As a result, the voltage driver AMP17 sends a driving voltage V23 to the piezoelectric actuator 152 of the support member 142 such that the difference between the detection outputs of the distance sensors 171A and 171C becomes zero, and the piezoelectric actuator 152 is driven by the driving voltage V23. It expands and contracts according to. As a result, the distance sensor 17 is determined based on the height of the distance sensor 171A closest to the movable fulcrum O ₁ (FIG. 6) in the tilt direction.
Feedback can be applied so that the detection output of 1C coincides with the detection output of the distance sensor 171A, and the tilt adjustment (vertical displacement degree adjustment) of the drum 41 during rotation can be performed.

[0055] Also when an arbitrary tilting the rotating drum 41 in the tilt direction, by inputting the offset voltage V17 to the inverting input terminal of the sensor amplifier AMP12 from the power supply voltage V _CC through a variable resistor R12, a distance sensor 171C detecting The difference voltage V between the output V11 and the offset voltage V17
By sending 18 to the control amplifier AMP14, the tilt in the tilt direction determined by the offset voltage V17 can be given by the piezoelectric actuator 152.

On the other hand, the detection output V12 output from the distance sensor 171B is input to the non-inverting input terminal of the control amplifier AMP13 via the sensor amplifier AMP11.

The control amplifier AMP13 inputs the detection output V13 of the distance sensor 171A to the inverting input terminal, and sets the difference between the detection outputs of the distance sensors 171A and 171C as an error voltage V16 to the voltage driver AMP15.
And the inverting input terminal of the voltage driver AMP16.

Thus, the voltage drivers AMP15 and AM
P16 performs a differential operation with respect to the error voltage V16, thereby moving one of the piezoelectric actuators 157A and 157B in the extending direction and the other in the contracting direction. Thus, based on the height of the distance sensor 171A closest to the movable fulcrum O ₂ (FIG. 3B) in the azimuth direction, the detection output of the distance sensor 171B is
Feedback can be applied so as to match the detection output of 1A, and azimuth adjustment (horizontal level adjustment) of the rotating drum 41 can be performed.

Here, the oscillation waveform sent from the oscillation waveform generating circuit 179 is input to the inverting input terminal of the sensor amplifier AMP11 as the offset voltage V14. The offset voltage V14 is, for example, several [kHz] to as shown in FIG.
It has a continuous vibration waveform AC11 having a frequency of several tens [kHz] and a relatively small amplitude. The sensor amplifier AMP11 has a detection output V12 of the distance sensor 171B and an offset voltage V11.
14 is supplied to the control amplifier AMP1.
3

Accordingly, the control amplifier AMP13 operates the voltage drivers AMP15 and AMP16 based on the differential voltage V15 which continuously oscillates, whereby the piezoelectric actuators 157A and 157B can be continuously expanded and contracted. Fixed upper drum 43
Vibrates continuously.

In the above configuration, the rotary drum device 14
Reference numeral 0 denotes a rotating shaft 44 pivotally supported by the fixed upper drum 43 and a rotating shaft 14 pivotally supported by the fixed lower drum 4.
1 is fixed.

Therefore, when replacing the magnetic head 12,
During rotation, the drum 41 is replaced together with the fixed upper drum 43. At this time, the parallelism of the mounting surface 46A of the flange 46 fitted and fixed to the rotating shaft 44 (that is, the rotating shaft 44).
And the flatness of the mounting surface of the rotating drum 41 with respect to the flange 46 falls within a predetermined reference range, and an error in the rotation locus of the magnetic head 12 with respect to the fixed upper drum 43 is allowed. Within range.

Therefore, by previously fixing the fixed upper drum 43 incorporating the rotating drum 41 to the supporting member 142 in this manner, when the rotating drum 41 is attached to the flange 46 in the conventional manner, According to the present invention, mounting errors occurring between the drums 41 during rotation can be eliminated.

Further, for example, 180
In assembling a rotary drum device having a plurality of magnetic heads 12 such that two magnetic heads 12 are mounted opposite each other, the plurality of magnetic heads 12 follow the same trajectory when the magnetic heads 12 are mounted on the drum 41 during rotation. The adjustment is made so that the
Of the rotating drum 41 via the flange 46 to the rotating shaft 44 of
Perform with the attached.

Accordingly, the trajectories of the plurality of magnetic heads 12 can be adjusted in a state where the fixed upper drum 43, the rotating shaft 44, the flange 46, and the rotating drum 41 are assembled as one component. As a result, the magnetic head 12 can be replaced by replacing the fixed upper drum 43, the rotating shaft 44, the flange 46, and the rotating drum 41 as a single replacement part.
According to the present invention, when the drum 2 is replaced, the process of attaching the rotating drum 41 to the flange 46 can be eliminated according to the present invention, whereby the plurality of magnetic heads 12 can be replaced while their trajectories are guaranteed. can do.

Here, the fixed upper drum 43 is connected to the support member 142.
The piezoelectric actuator control circuit 175 allows the distance sensor 1
By expanding and contracting the piezoelectric actuator 152 based on the detection outputs of 71A and 171C, the fixed upper drum 4
3 and the rotation of the drum 41 during the rotation can be adjusted in the tilt direction.

The piezoelectric actuator control circuits 175 differentially operate the piezoelectric actuators 157A and 157B based on the detection outputs of the distance sensors 171A and 171B to adjust the inclination of the fixed upper drum 43 and the rotating drum 41 in the azimuth direction. be able to.

Accordingly, the piezoelectric actuator control circuit 175
Accordingly, control can be performed such that the distance between the lower side surface 41C of the rotating drum 41 and the fixed lower drum 4 always coincides with each other.

In the piezoelectric actuator control circuit 175 for performing such control, the piezoelectric actuators 157A and 157B are continuously expanded and contracted by the vibration waveform AC11 output from the vibration waveform generation circuit 179, whereby the fixed upper drum 43 is moved. By performing the micro-vibration, the friction coefficient between the fixed upper drum 43 and the magnetic tape slidably contacting the upper drum 43 decreases.

Therefore, according to the above structure, the wear of the magnetic tape can be reduced by continuously vibrating the upper drum 43 finely to reduce the coefficient of friction with the magnetic tape.
This can protect the magnetic tape and improve the running characteristics of the magnetic tape.

When the magnetic head 12 is replaced, the fixed upper drum 43 to be fastened to the support member 142 and the rotating drum 41 integrally assembled with the fixed upper drum 43 are collectively replaced. The rotation trajectory of the magnetic head 12 fixed to the magnetic head 12 is adjusted by the piezoelectric actuators 152, 157A, and 157B of the support member 142, so that the rotation trajectory of the magnetic head 12 before and after the replacement of the magnetic head 12 can be accurately determined. Can be matched.

Accordingly, even in a rotating drum device of a recording / reproducing apparatus for performing high-density recording such as forming a recording track with a width of several [μm] on a magnetic tape, compatibility of the rotation locus of the magnetic head 12 is ensured. The replacement of the magnetic head 12 can be easily performed.

In the above-described embodiment, the case where the fixed upper drum 43 is continuously vibrated has been described. However, the present invention is not limited to this, and as shown in FIG. Time point t1 at which the magnetic tape starts running
1 from time 1 to time t12 after a lapse of a predetermined period.
[kHz] Vibration waveform A with a frequency less than or equal to and large in amplitude
C12 is output from the oscillation waveform generation circuit 179 to the offset voltage V
By sending it to the sensor amplifier AMP11 as 14, the fixed upper drum 43 can be vibrated with a relatively large amplitude when the magnetic tape starts running, so that the magnetic tape is stuck to the fixed upper drum 43. In this case, it can be easily peeled off. Therefore, breakage such as cutting of the magnetic tape can be avoided.

In the above embodiment, the case where the fixed upper drum 43 is vibrated in the azimuth direction by the piezoelectric actuators 157A and 157B has been described.
The present invention is not limited to this, and the fixed upper drum 43 may be vibrated in the tilt direction by the piezoelectric actuator 152.

Further, in the above-described embodiment, the case where the present invention is applied to the middle drum type rotary drum device 140 has been described. However, the present invention is not limited to this, This can also be applied.

In the above-described embodiment, the rotary shaft 14 pivotally supported on the fixed lower drum 4 is driven by the drive motor 6 so that the flexible joint 4
7 has been described, the present invention is not limited to this, and the rotating shaft 14 and the rotating shaft 44 are rotationally driven while being synchronized by separate drive motors. You may do it.

In the above-described embodiment, the piezoelectric actuators 152, 157A, and 15 having a laminated ceramic structure are used.
7B is used, but the present invention is not limited to this, and the slits 142C and 142C are formed using a small motor or the like.
Each 2D gap may be changed.

In the above-described embodiment, the case where the present invention is applied to the rotary drum device of the video tape recorder has been described. However, the present invention is not limited to this. For example, it is possible to record and / or reproduce a digital audio signal. The present invention can be applied to various other rotary drum devices such as a rotary drum device of an audio tape recorder made.

[0079]

As described above, according to the present invention, the first rotating shaft holding member is continuously finely vibrated by the vibration generating means, so that the friction of the tape-shaped recording medium slidably in contact with the rotating drum device. The coefficient can be reduced, thereby reducing the wear of the tape-shaped recording medium.

When the tape-shaped recording medium wound around the rotary drum device starts running, the first rotary shaft holding member is vibrated by the vibration generating means so that the tape-shaped recording medium is stuck to the rotary drum device. Even when the tape-shaped recording medium is attached, the tape-shaped recording medium can be easily peeled off, thereby preventing the tape-shaped recording medium from being damaged.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a rotary drum device of a middle drum type according to the present invention.

FIG. 2 is a perspective view illustrating a configuration of a support member.

FIG. 3 is a top view and a side view showing a configuration of a support member.

FIG. 4 is a schematic diagram illustrating azimuth adjustment of a magnetic head locus.

FIG. 5 is a schematic diagram for explaining a tilt adjustment of a magnetic head locus.

FIG. 6 is a sectional view showing an arrangement state of a distance sensor.

FIG. 7 is a block diagram showing a configuration of a piezoelectric actuator control circuit.

FIG. 8 is a signal waveform diagram showing a continuous vibration waveform.

FIG. 9 is a signal waveform diagram showing a vibration waveform superimposed at the start of tape running.

FIG. 10 is a top view and a side view showing a conventional middle drum type rotary drum device.

FIG. 11 is a cross-sectional view showing a conventional middle drum type rotary drum device.

FIG. 12 is a side view showing a conventional upper drum type rotary drum device.

FIG. 13 is a sectional view showing a conventional upper drum type rotary drum device.

[Explanation of symbols]

4 ... fixed lower drum, 6 ... drive motor, 12 ... magnetic head, 13 ... rotary transformer, 14, 44 ... rotating shaft, 41 ... rotating drum, 43 ... fixed upper drum,
46 ... Flange, 47 ... Flexible joint,
140 ... rotating drum device, 142 ... support member, 14
2A, 142B ... notch, 142C, 142D ...
Slit, 152, 157A, 157B ... Piezoelectric actuator, 171A, 171B, 171C ... Distance sensor, 175 ... Piezoelectric actuator control circuit, 179 ...
... vibration waveform generation circuit, AC11, AC12 ... vibration waveform.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hideaki Kawada 6-7-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation (58) Field surveyed (Int. Cl. ⁷ , DB name) G11B 5 / 588 G11B 15/61

Claims (3)

(57) [Claims] A first rotating shaft holding member for rotating a head fixed on a rotating drum to record and / or reproduce a predetermined signal on a tape-shaped recording medium which slides on the head; A support member for fastening the second rotating shaft holding member, a first rotating shaft rotatably supported by the first rotating shaft holding member, and a rotatably pivoting support to the second rotating shaft holding member. And the first
A second rotating shaft that is divided with respect to the rotating shaft, a synchronization unit that matches the rotating operations of the first rotating shaft and the second rotating shaft, and is fixedly engaged with the first rotating shaft. The rotating drum having the head, adjusting means for adjusting the degree of horizontality and vertical displacement of the first rotating shaft holding member, and finely vibrating the adjusting means to the first rotating shaft holding member. And a vibration generating means for continuously applying fine vibrations to the first rotating shaft holding member by continuously applying fine vibrations to the first rotating shaft holding member. A rotary drum device characterized in that the friction coefficient of the recording medium is reduced. 2. A rotating drum device which records and / or reproduces a predetermined signal on a tape-shaped recording medium which slides on the head by rotating a head fixed on the rotating drum. A support member for fastening the second rotating shaft holding member, a first rotating shaft rotatably supported by the first rotating shaft holding member, and a rotatably pivoting support to the second rotating shaft holding member. And the first
A second rotating shaft that is divided with respect to the rotating shaft, a synchronization unit that matches the rotating operations of the first rotating shaft and the second rotating shaft, and is fixedly engaged with the first rotating shaft. A rotating drum having the head; adjusting means for adjusting the horizontality and vertical displacement of the first rotating shaft holding member; and the first rotating shaft by vibrating the adjusting means at a predetermined timing. Vibration generating means for applying vibration to the first rotating shaft holding member when the tape-shaped recording medium in sliding contact with the holding member is started, and the first rotating shaft when the tape-shaped recording medium starts running. A rotating drum device, wherein the tape-shaped recording medium stuck to the first rotating shaft holding member is peeled off by applying vibration to the holding member. 3. The rotary drum device according to claim 1, wherein said synchronization means comprises a flexible joint connecting said first rotary shaft and said second rotary shaft.