JP3402500B2 - 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. Field of 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 and 7) 8) Action (FIG. 1, FIG. 2, FIG. 3, FIG. 7 and FIG. 8) Example (FIGS. 1 to 9) Effect of the invention

[0002]

FIELD OF THE INVENTION The present invention relates to a rotary drum device,
This is to further improve 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 rotating drum device and rotated, so that the magnetic head is attached to a recording track formed obliquely in sequence with respect to the longitudinal direction of the magnetic tape running while being wound on the rotating drum device. A predetermined video signal is recorded and / or reproduced via the.

As such a rotary drum device, there is a middle drum type device which rotates a middle drum provided between a fixed upper drum and a fixed lower drum. That is, FIG.
(A) And (B) shows the top view and side view of the rotary drum apparatus 1 of a middle drum type, the cylindrical fixed upper drum 3 is fastened to the support member 2 by the screws 7A and 7B, and the said support. 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 the magnetic head 1 is slightly protruded from the peripheral side portion of the rotating drum 11.
2 is fixed. The rotating drum 3 is rotationally driven by the drive motor 6, and accordingly, the magnetic head 12 is rotated between the fixed upper drum 3 and the fixed lower drum 4.

At this time, a magnetic tape (not shown) runs diagonally along the outer peripheral side surfaces of the fixed upper drum 3 and the fixed lower drum 4 on the rotation locus of the magnetic head 12 fixed to the rotating drum 11. The recording tracks can be sequentially formed on the magnetic tape in a diagonal direction in the longitudinal direction.

FIG. 11 shows a sectional view of the rotary drum device 1. A transformer casing 4A is formed on the lower side of the fixed lower drum 4, and a stator 13A of a rotary transformer 13 is fixed in the transformer casing 4A. Has been done. Further, a cylindrical bearing holder 4B is formed in communication with the transformer housing 4A, and the rotary shaft 14 is rotatably supported by the bearings 15A and 15B held by the bearing holder 4B.

A flange 16 is fitted and fixed to the rotary shaft 14, and the rotary transformer 1 is mounted on the lower surface of the flange 16.
The rotor 13B of No. 3 is fixed, and the rotating drum 11 is fixed to the upper side surface of the flange 16. Therefore, by rotating the rotary shaft 14 by the drive motor 6 provided at the lower end of the rotary shaft 14,
The rotor 13B of the rotary transformer 13 and the rotating drum 11 can be rotationally driven.

A head substrate 21 is fastened to the peripheral side 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 the adjusting screw 22. Thus, by arranging the magnetic head 12 to project outside from the gap between the fixed upper drum 3 and the fixed lower drum 4, a predetermined image is formed on the magnetic tape (not shown) slidingly contacting the outer peripheral side surface via the magnetic head. A signal or the like can be recorded or reproduced.

Secondly, there is an upper drum type rotary drum device that rotates an upper drum provided on a fixed lower drum. That is, FIG. 12 in which parts corresponding to those in FIG.
Is rotatably supported, and the magnetic head 12 is fixed to the rotating upper drum 33 so as to slightly project from the peripheral side portion thereof. The rotary upper drum 33 is rotationally driven by the drive motor 6, and accordingly, the magnetic head 12 is rotated by the drive motor 6.
Rotates together with.

At this time, a magnetic tape (not shown) runs obliquely along the outer peripheral surface of the rotating upper drum 33 and the fixed lower drum 4 on the rotation locus of the magnetic head 12 fixed to the rotating upper drum 33. The recording tracks can be sequentially formed on the magnetic tape in a diagonal direction in the longitudinal direction.

FIG. 13 in which parts corresponding to those in FIG. 11 are designated by the same reference numerals is shown in FIG.
A transformer casing 4A is formed on the lower side of the fixed lower drum 4, and the stator 13A of the rotary transformer 13 is fixed in the transformer casing 4A. Also transformer housing 4
A cylindrical bearing holding portion 4B is formed in communication with A, and the rotary shaft 14 is rotatably supported by bearings 15A and 15B held by the bearing holding portion 4B.

A flange 16 is fitted and fixed to the rotary shaft 14, and the rotary transformer 1 is mounted on the lower surface of the flange 16.
The rotor 13B of No. 3 is fixed, and the rotating upper drum 33 is fixed to the upper side surface of the flange 16. Therefore, by rotating the rotary shaft 14 by the drive motor 6 provided at the lower end of the rotary shaft 14,
The rotor 13B of the rotary transformer 13 and the rotary upper drum 33 can be rotationally driven.

A head substrate 21 is fastened to the peripheral side 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 the adjusting screw 22. Thus, on the fixed lower drum 4, the magnetic head 12
By arranging and projecting to the outside and rotating this, it is possible to record or reproduce a predetermined video signal or the like via a magnetic head on a magnetic tape (not shown) in sliding contact with the outer peripheral side surface.

[0015]

By the way, in the rotary drum device 1 having such a structure, the magnetic head 12 is replaced by replacing the entire rotating drum 11 with respect to the flange 16.

In this case, the perpendicularity of the mounting surface (upper side surface) 16A of the flange 16 to the rotating shaft 14 (that is, the parallelism of the mounting surface 16A) and the mounting surface 11A of the rotating drum 11 to the mounting surface 16A of the flange 16 are defined. The parallelism determines the trajectory drawn by the magnetic head 12 fixed to the rotating drum 11, and it is difficult to keep the trajectory within a few [μm] with respect to a plane perpendicular to the rotation axis 14, for example. However, since an error occurs in the trajectory of the magnetic head 12, it is difficult to achieve high density recording by narrowing the recording track formed on the magnetic tape.

When a plurality of magnetic heads 12 are provided for one rotating drum 11 such as a 180-degree facing head, the rotating drum 11 is assembled in the assembly process.
Is attached to an assembling jig flange having the same structure as the flange 16, and the tracks of the plurality of magnetic heads 12 are parallel to the attaching surface of the jig flange (the same surface as the attaching surface 16A of the flange 16). However, in this case, if the parallelism of the mounting surface of the jig flange has an error with respect to the parallelism of the mounting surface 16A of the flange 16 to be actually assembled, the jig flange is fixed to the rotating drum 11. There is a problem that the locus drawn by the magnetic head 12 does not fall within a few [μm] with respect to a plane perpendicular to the rotation axis 14, for example.

On the other hand, in the rotary drum device 30, the magnetic head 12 is replaced by replacing the entire rotary upper drum 33 with the flange 16, and in this case also, the flange 16 is similarly replaced. The parallelism of the mounting surface 16A and the parallelism of the rotary upper drum 33, and further the parallelism of the jig flange when assembling the plurality of magnetic heads 12 to the rotary upper drum 33 make The accuracy was determined, and it was difficult to keep the rotation locus within a few [μm] for one surface.

When the magnetic tape expands or contracts due to aging or the like, the scanning track of the magnetic head 12 with respect to the recording track formed on the magnetic tape is inclined so that accurate tracking can be performed with respect to the recording track. There was a problem that made it difficult.

As one method for solving this problem, a method of changing the scanning locus of the magnetic head 12 by using, for example, a dynamic tracking head (DT head) as the magnetic head 12, is conceivable. In this case, since the DT head is used, there is an unavoidable problem that the structure becomes complicated.

The present invention has been made in consideration of the above points, and the head can be rotated with high precision along a predetermined rotation locus, and tracking can be accurately performed on the recording track. It proposes a rotary drum device.

[0022]

In order to solve such a problem, according to the present invention, by rotating the head 12 fixed on a rotary drum 41, a predetermined signal is applied to a tape-shaped recording medium which is in sliding contact with the head 12. 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 together.
42, a first rotating shaft 44 rotatably supported by the first rotating shaft holding member 43, and a first rotating shaft 44 rotatably supported by the second rotating shaft holding member 4, A second rotating shaft 14 divided in relation to the first rotating shaft 44 and a synchronizing means 47 for matching the rotating operation of the second rotating shaft 14;
Of the rotary drum 44, which is fixedly engaged with the rotary shaft 44 of the head and has the head 12, and the detecting means 17 for detecting the envelope inclination of the reproduction RF signal SRF1 obtained through the head 12.
6 and the first member 142 for fastening the first rotary shaft holding member 43 by the first slit 142D formed in the support member 142 in the direction perpendicular to the surface formed by the rotation locus of the head 12. 1 vertical adjustment block 142E,
142G and a second vertical adjustment block 142F that fastens the second rotary shaft holding member 4, and a second vertical block 142F that is formed in a horizontal direction with respect to a plane formed by the rotation trajectory of the head 12. The first horizontal adjustment block 142E for fastening the first rotary shaft holding member 43 and the second horizontal adjustment blocks 142F, 142 for fastening the second rotary shaft holding member 4 by the slit 142C.
Adjusting means 142A, 142B, 142C for dividing into G,
142D, 152, 157A, 157B, and the adjustment means 142A, 142B, 142C, 142D, 1
52, 157A, 157B change the gap between the first slits 142D by the first actuator 152 based on the detection result of the detection means 176, so that the first rotary shaft holding member 43 is moved in the vertical direction. The displacement of the second slit 142C is adjusted and the gap of the second slit 142C is changed by the second actuators 157A and 157B to adjust the inclination of the first rotary shaft holding member 43 with respect to the horizontal direction. The inclination of the scanning locus with respect to the track of the tape-shaped recording medium is corrected.

Further, in the present invention, the synchronization means is the first
The flexible joint 47 connecting the rotating shaft 44 and the second rotating shaft 14 of FIG.

[0024]

[0025]

When the head 12 is replaced, the first rotary shaft 44
The rotary drum 41 engaged and fixed with the first rotary shaft holding member 43 is replaced, and the head locus on the rotary drum engaged and fixed with the first rotary shaft by the adjusting means becomes a predetermined locus. By adjusting the displacement in the vertical direction and adjusting the inclination with respect to the horizontal direction as described above, the head rotation loci can be matched before and after the head replacement.

In the adjusting means 175, the head 12
By tilting the rotational locus of the head 12 in a predetermined direction so as to correct the envelope inclination of the reproduction RF signal SRF1 obtained via the, the rotational locus of the head 12 that matches the track of each tape-shaped recording medium to be used. Adjustments can be made.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

The rotary drum device 140 of the medium drum type shown in FIG.
The fixed upper drum 43 is fastened to the support member 142 by the screw 7A.

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

A cylindrical fitting portion 46B formed at the center of the flange 46 is fitted and fixed to the lower end of the rotary shaft 44. Mounting surface (upper side surface) 4 of this flange 46
A rotating drum 41 is fixed to 6A. Further, 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.
Is fixed. This magnetic head 12 has an adjusting screw 22.
The height can be finely adjusted by using. Thus, the magnetic head 12 of the rotating drum 41 is integrated with the rotating shaft 44.
Can rotate.

Here, the rotary shaft 44 provided on the fixed upper drum 43 side and the rotary shaft 14 provided on the fixed lower drum 4 side are respectively coupled by a flexible joint 47, and the drive motor 6 is rotated. Drive and rotate axis 1
When 4 is rotated, the rotary shaft 44 can be rotated integrally with this. 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.

Further, the fixed upper drum 43 and the fixed lower drum 4
The support member 142 for supporting the two slits 142C
And 142D are formed, and as shown in FIG. 2, the notches 142A and 14 are communicated with the slit 142C.
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 divided into notches 142A and 14A.
It is connected by a connecting portion 159 formed between 2B.

A support hole 160A is formed in the vertical direction on the upper surface of the notch 142A.
Inside A, a cylindrical piezoelectric actuator 157A is provided. This piezoelectric actuator 157A has its lower end abutted on the bottom surface of the notch 142A, and its upper end abutted on 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 vertical direction on the upper surface of the notch 142B.
Inside B, a cylindrical piezoelectric actuator 157B is provided. This piezoelectric actuator 157B has its lower end abutted on the bottom surface of the notch 142B, and its upper end abutted on 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.

Piezoelectric actuators 157A and 157B
Are expanded and contracted in the longitudinal direction (direction of arrow d or the opposite direction) according to the applied voltage value. Therefore, the piezoelectric actuators 157A and 157
By controlling the voltage value applied to B respectively, and contracting the piezoelectric actuator 157A and extending the piezoelectric actuator 157B as shown in FIG.
The upper drum fixing block 42E tilts in the direction indicated by the arrow a around the fulcrum O ₂ of 59.

On the other hand, the piezoelectric actuator 157A
And the piezoelectric actuator 157B is contracted, the upper drum fixing block 42E is tilted in the direction opposite to the direction indicated by the arrow a with the fulcrum O ₂ of the coupling portion 159 as the center.

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

Further, the piezoelectric actuators 157A and 15
The upper drum fixing block 142E (Fig. 3)
When (B)) is tilted in the opposite direction to the arrow a, the fixed upper drum 43 fixed to the fixed block 142E is tilted in the opposite direction 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 is also tilted in the opposite direction to the arrow a together with the fixed upper drum 43, and as a result, the rotating drum 4 is rotated.
The locus of the magnetic head 12 fixed to 1 can be inclined with respect to a magnetic tape (not shown) that is in sliding contact with the peripheral side surfaces of the fixed upper drum 43 and the fixed lower drum 4.

In this way, by adjusting the expansion / contraction amount of the piezoelectric actuators 157A and 157B (FIG. 3B) according to the voltage value applied thereto, the scanning locus of the magnetic head 12 with respect to the magnetic tape is inclined in the azimuth direction. be able to. Incidentally, such adjustment in the azimuth direction is called horizontality adjustment.

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

A support hole 160C communicating with the lower drum fixing block 142F is formed in the tilt adjusting block 142G, and the piezoelectric actuator 152 is connected to 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 direction in which the tilt adjusting block 142G approaches the lower drum fixing block 42F (direction of arrow b).
The piezoelectric actuator 152 can be displaced to
It is possible to displace G in the direction away from the lower drum fixing block 142F (the direction opposite to the arrow b).

Accordingly, as shown in FIG. 1, when the piezoelectric actuator 152 displaces the tilt adjusting block 142G in the direction of arrow b with respect to the lower drum fixing block 142F, the upper part of the tilt adjusting block 142G is connected to the tilt adjusting block 142G. The fixed upper drum 43 can be displaced through the drum fixing block 142E. This fixed upper drum 4
The displacement direction of 3 is the direction indicated by the arrow c with the fulcrum O ₁ of the coupling portion 165 of the support member 142 as the center.

On the other hand, when the piezoelectric actuator 152 displaces the tilt adjusting block 142G in the direction opposite to the arrow b with respect to the lower drum fixing block 142F, the tilt adjusting block 142G is coupled to the tilt adjusting block 142G. The fixed upper drum 43 can be displaced through the drum fixing block 142E. This fixed upper drum 4
The displacement direction of 3 is the fulcrum O of the connecting portion 65 of the support member 142.
_The direction is opposite to the arrow c centered on ₁ .

As a result, as shown in FIG. 5 in which the supporting member 42 of FIG. 3B is viewed as the rotary drum device 140 from the opposite side of the paper surface, the fixed upper drum 43 is horizontal (FIG. 5A).
When the fixed upper drum 43 is displaced in the direction of arrow c by the piezoelectric actuator 152 in FIG. 5 (B), the rotary shaft 44 (FIG. 1) of the fixed upper drum 43 is correspondingly moved.
The rotating drum 41, which is integrated with the stationary drum 43, also tilts in the direction of arrow c together with the fixed upper drum 43. As a result, the locus of the magnetic head 12 fixed to the rotating drum 41 is determined by The magnetic tape (not shown) slidably contacting with can be displaced upward.

The fixed upper drum 43 is horizontal (see FIG. 5).
When the fixed upper drum 43 is displaced in the opposite direction to the arrow c by the piezoelectric actuator 152 in (A)) (FIG. 5C), the rotary shaft 44 of the fixed upper drum 43 (FIG. 5C) is correspondingly moved. The rotating drum 41 integrated with 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 rotating drum 41
Can be displaced downward with respect to a magnetic tape (not shown) that is in sliding contact with the peripheral side surfaces of the fixed upper drum 43 and the fixed lower drum 4.

By thus adjusting the expansion / contraction amount of the piezoelectric actuator 152 (FIG. 1), the scanning locus of the magnetic head 12 with respect to the magnetic tape is moved in the vertical direction (tilt direction).
Can be translated. Incidentally, such adjustment in the tilt direction is called vertical displacement adjustment.

Here, as shown in FIG. 6, the rotary drum device 1
An area where the magnetic head 12 is not provided on the lower side surface 41C of the rotating drum 41 of 40 is mirror-finished, and a distance sensor 171C is fixed at a position facing the lower side surface 41C of the fixed lower drum 4. . The distance sensor 171C includes a laser diode for irradiating the lower side surface 41C of the rotating drum 41 with a laser beam and a lower side surface 41C.
A light receiving portion 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 provided at the light receiving position of the reflected laser light (that is, the distance from the lower side surface 41C). A detection output having a corresponding voltage level is sent to the control unit.

In the rotary drum device 140, the distance sensor 1 having the same structure as the distance sensor 171C having the above structure.
71A and 171B are fixed to the lower fixed drum 4. The arrangement of the distance sensors 171A, 171B, and 171C is shown in FIG.
, The distance sensors 171A and 171C
Is the center of rotation of the rotating drum 41 (that is, the rotation shaft 44)
Is arranged on a straight line passing through the distance sensor 171B, and the distance sensor 171B is arranged at a position spaced apart by 90 degrees from the distance sensors 171A and 171C.

On the straight line passing through the distance sensors 171A and 171C, the connecting portion 159 of the supporting member 142 shown in FIG.
, Which allows piezoelectric actuators 157A and 1
57B when the rotating drum 41 is adjusted in azimuth 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 piezoelectric actuator 152 prevents the rotating drum 41 from moving. The detection outputs of the distance sensors 171A and 171C change when the tilt adjustment (vertical displacement degree adjustment) is performed and when the rotating drum 41 is displaced in the tilt direction.

Further, the detection output of the distance sensor 171B changes when the rotating drum 41 is tilt-adjusted 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.

Here, FIG. 7 shows distance sensors 171A and 171.
A piezoelectric actuator control circuit 175 for controlling the applied voltage to each piezoelectric actuator 152, 157A and 157B based on each detection output of B and 171C is shown.
The detection output V11 output from the distance sensor 171C is sent 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 thereof, and sets the difference between the detection outputs of the distance sensors 171A and 171C as the error voltage V19 to the voltage driver AMP17.
Input to the non-inverting input terminal of.

As a result, the voltage driver AMP17 sends the driving voltage V23 to the piezoelectric actuator 152 of the support member 142 so that the difference between the detection outputs of the distance sensors 171A and 171C becomes 0, so that the piezoelectric actuator 152 drives the driving voltage V23. Expands and contracts according to. As a result, the distance sensor 17 is based on the height of the distance sensor 171A closest to the movable fulcrum O ₁ (FIG. 6) in the tilt direction.
Feed back can be applied so that the detection output of 1C matches the detection output of the distance sensor 171A, and the tilt adjustment (vertical displacement degree adjustment) of the rotating drum 41 can be performed.

When the rotating drum 41 is arbitrarily tilted in the tilt direction, the offset voltage V17 is input from the power supply voltage V _CC to the inverting input terminal of the sensor amplifier AMP12 via the variable resistor R12 to detect the distance sensor 171C. Difference voltage V between output V11 and 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 the difference between the detection outputs of the distance sensors 171A and 171C is set as the error voltage V16 to the voltage driver AMP15.
Input to the non-inverting input terminal and the inverting input terminal of the voltage driver AMP16.

Thus, the voltage drivers AMP15 and AM
P16 operates differentially with respect to the error voltage V16 to move one of the piezoelectric actuators 157A and 157B in the extending direction and the other in the contracting direction. Thus, the movable fulcrum O in the azimuth direction
_{2 Based on} the height of the distance sensor 171A closest to FIG. 3 (B), the feedback output can be applied so that the detection output of the distance sensor 171B matches the detection output of the distance sensor 171A. Azimuth adjustment (horizontal level adjustment) can be performed.

Here, the reproduction RF signal SRF1 obtained via the magnetic head 12 is R via the preamplifier AMP21.
It is input to the F peak detection circuit 176. The RF peak detection circuit 176 detects the peak of the RF signal from the reproduction RF signal SRF1 and inputs the RF peak signal SRF2 to the tilt controller 177.

The tilt controller 177 detects the tilt of the track pattern formed on the magnetic tape with respect to the scanning locus of the magnetic head 12 on the basis of the RF peak signal SRF2, and an offset voltage V14 for correcting the tilt.
Is input to the inverting input terminal of the sensor amplifier AMP11.

Accordingly, the detection output V1 of the distance sensor 171B
By sending the difference voltage V15 between the offset voltage V14 and the offset voltage V14 to the control amplifier AMP13, the tilt in the tilt direction determined by the offset voltage V14 can be given by the piezoelectric actuators 157A and 157B.

Thus, as shown in FIG. 8A, when the scanning locus of the magnetic head 12 is inclined with respect to the recording track of the magnetic tape, the reproduction RF signal SRF1 reproduced via the magnetic head 12 is reproduced. Has a signal waveform with a tilted envelope, but the tilt controller 177 of the piezoelectric actuator control circuit 175 corrects the scanning trajectory of the magnetic head 12 so as to match the tilt of the recording track in accordance with the recording track. ,
As shown in FIG. 8B, a good reproduction RF signal SRF1 '
To get

By the way, the tilt controller 177 superimposes the AC signal AC1 as shown in FIG. 9 on the offset voltage V14 given to the sensor amplifier AMP11, and the driving voltage V given to the piezoelectric actuators 157A and 157B.
21 and V22 are changed to an AC wave shape, and the piezoelectric actuators 157A and 157B are expanded / contracted in accordance with this, thereby wobbling the magnetic head 12 and thereby detecting the maximum value of the reproduction RF signal. it can.

In the above structure, the rotary drum device 14
In 0, the rotating shaft 44 pivotally supported by the fixed upper drum 43 and the rotating shaft 14 pivotally supported by the fixed lower drum 4 are divided, and the rotating drum 44 is rotated by the rotating shaft 44 pivotally supported on the fixed upper drum 43 side.
1 is fixed.

Therefore, when replacing the magnetic head 12,
The rotating drum 41 and the fixed upper drum 43 will be replaced. At this time, the parallelism of the mounting surface 46A of the flange 46 fitted and fixed to the rotary shaft 44 (that is, the rotary shaft 44
And the flatness of the mounting surface of the rotating drum 41 with respect to the flange 46 are within a preset reference range, and an error in the rotational trajectory of the magnetic head 12 relative to the fixed upper drum 43 is allowed. It is included in the range.

Accordingly, by fastening the fixed upper drum 43 in which the rotating drum 41 is assembled in advance to the support member 142, the flange 46 and the flange 46 when the rotating drum 41 is attached to the flange 46 as in the conventional case. According to the present invention, a mounting error caused between the rotating drums 41 can be eliminated.

In addition, one rotating drum 41 has, for example, 180
In assembling a rotary drum device having a plurality of magnetic heads 12 such that two magnetic heads 12 are opposed to each other, when the magnetic heads 12 are attached to the rotating drum 41, the plurality of magnetic heads 12 follow the same locus. Adjustment is made so that the fixed upper drum 43
The rotating drum 44 of the rotating drum 44 through the flange 46.
With the attached.

Therefore, the loci of the plurality of magnetic heads 12 can be adjusted with the fixed upper drum 43, the rotating shaft 44, the flange 46 and the rotating drum 41 assembled as one component. As a result, when the magnetic head 12 is replaced, the fixed upper drum 43, the rotary shaft 44, the flange 46, and the rotating drum 41 are assembled and replaced as a single replacement part, so that the magnetic head 1 can be replaced as in the conventional case.
When the rotating drum 41 is attached to the flange 46 when exchanging the two, the process can be eliminated by the present invention, and thus the plural magnetic heads 12 are exchanged while the loci of the magnetic heads 12 are guaranteed. can do.

Here, the fixed upper drum 43 is attached to the support member 142.
Even if there is a mounting error due to dust or the like when fastening with respect to, the piezoelectric actuator control circuit 175 causes the distance sensor 1 to
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 rotating drum 41 can be adjusted in displacement in the tilt direction.

Further, the piezoelectric actuator control circuit 175 differentially operates 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
Thus, it is possible to perform control such that the distance of the lower side surface 41C of the rotating drum 41 with respect to the fixed lower drum 4 is always matched, or control is performed so as to obtain a desired rotation locus.

Further, the reproduction RF signal (RF peak signal SRF) obtained via the magnetic head 12 is detected, and the magnetic head 12 is rotated via the piezoelectric actuators 157A and 157B so that the reproduction RF signal has a good waveform. By controlling the locus, the inclination of the scanning locus of the magnetic head 12 with respect to the recording track formed on the magnetic tape can be corrected.

As described above, the rotational locus of the magnetic head 12 can be adjusted according to the recording track of each magnetic tape to be used. For example, even when the magnetic tape is extended, the magnetic head can be adjusted accordingly. Twelve rotation trajectories can be matched.

According to the above construction, the fixed upper drum 4 which is fastened to the support member 142 when the magnetic head 12 is replaced.
3 and the rotating drum 41 integrally assembled with the fixed upper drum 43 are replaced together.
The rotation trajectory of the magnetic head 12 fixed to the
Two piezoelectric actuators 152, 157A and 157B
The magnetic head 1 can be adjusted by adjusting
It is possible to match the rotation loci of the magnetic head 12 with high accuracy before and after the replacement of No. 2.

Thus, even in the rotary drum device of the recording / reproducing apparatus for performing high-density recording such that recording tracks are formed on the magnetic tape with a width of several [μm], the compatibility of the rotational locus of the magnetic head 12 is ensured. The magnetic head 12 can be easily replaced.

The tilt controller 177 of the piezoelectric actuator control circuit 175 is used to adjust the rotation locus of the magnetic head 12 so that the reproduced RF signal has a good waveform, so that the magnetic tape is used for each magnetic tape to be used. The rotational trajectory of the magnetic head 12 can be adjusted according to the recording track, and as a result, the tracking adjustment for the recording track can be easily performed without using the DT head having a complicated structure as in the conventional case.

In the above embodiment, the case where the present invention is applied to the intermediate drum type rotary drum device 140 has been described. However, the present invention is not limited to this, and an upper drum type in which the upper drum rotates can be used. Can also apply this.

Further, in the above-described embodiment, the rotary shaft 14 pivotally supported on the fixed lower drum 4 side is driven by the drive motor 6, and the flexible joint 4 with respect to the rotary shaft 14 is driven.
The case where the rotary shaft 44 coupled by 7 is rotated has been described, but the present invention is not limited to this, and the rotary shaft 14 and the rotary shaft 44 are rotationally driven while being synchronized by respective separate drive motors. You may do it.

Further, in the above-mentioned embodiment, the piezoelectric actuators 152, 157A, 15 of the laminated ceramic structure are used.
Although the case where 7B is used has been described, the present invention is not limited to this, and the slits 142C and 14C are formed by using a small motor or the like.
The 2D gaps may be changed.

In the above embodiment, the case where the present invention is applied to the rotary drum device of the video tape recorder has been described, but the present invention is not limited to this, and for example, recording and / or reproducing 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 that has been made.

[0083]

As described above, according to the present invention, according to the detection result of the detecting means, the vertical and horizontal displacement of the first rotary shaft holding member supporting the first rotary shaft is adjusted by the first adjusting means. By adjusting with the 1st and 2nd actuators,
It is possible to adjust the displacement of the head locus on the rotary drum fixedly engaged with the first rotary shaft in the vertical direction so as to have a predetermined locus, and adjust the inclination with respect to the horizontal direction. Can be rotated at high density along the rotation locus of.

[0084]

Further, by controlling the adjusting means so as to correct the waveform of the reproduction RF signal obtained through the head to a predetermined waveform, the head locus is adjusted for each tape-shaped recording medium to be used in accordance with the recording track. It can be performed.

[Brief description of drawings]

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

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

3A and 3B are a top view and a side view showing a configuration of a support member.

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

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

FIG. 6 is a cross-sectional view showing an arrangement state of distance sensors.

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

FIG. 8 is a signal waveform diagram showing an RF peak detection signal waveform.

FIG. 9 is a signal waveform diagram for explaining the addition of an AC waveform to a control voltage.

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 medium drum type rotary drum device.

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

FIG. 13 is a cross-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 ...
Slits, 152, 157A, 157B ... Piezoelectric actuators, 171A, 171B, 171C ... Distance sensors, 175 ... Piezoelectric actuator control circuit, 176 ...
... RF peak detection circuit, 177 ... Tilt controller.

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hideaki Kawada 6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation (56) References JP-A-62-295212 (JP, A) JP-A-SHO 53-128321 (JP, A) JP-B-63-22364 (JP, B1) (58) Fields investigated (Int.Cl. ⁷ , DB name) G11B 5 / 48-5 / 53 G11B 5 / 56-5 / 60

Claims (2)

(57) [Claims] 1. Rotating a head fixed on a rotating drum
Tape-type recording medium that slides into contact with the head by
A rotary drum device that records and / or reproduces a predetermined signal on
Be careful Fastening the first rotary shaft holding member and the second rotary shaft holding member
A support member forthe above A first rotatably supported by a first rotary shaft holding member
Rotation axis ofthe above The second rotary shaft holding member is rotatably supported by the second rotary shaft holding member.
A second axis of rotation divided with respect to the first axis of rotation; The rotation operation of the first rotating shaft and the second rotating shaft is
Synchronization means to match, The head is engaged and fixed to the first rotating shaft and has the head.
The above rotating drum, Envelope of reproduced RF signal obtained through the head
Detecting means for detecting a tilt,In the above support member, due to the rotation trajectory of the head,
A first strip formed in a direction perpendicular to the surface to be formed
A first fastening means for fastening the first rotary shaft holding member
1 vertical adjustment block and the second rotary shaft holder
When divided into a second vertical adjustment block to fasten the material
Both face the surface formed by the trajectory of the head.
The second slit formed in the horizontal direction
First horizontal adjustment for fastening the first rotary shaft holding member
Second block for fastening the block and the second rotary shaft holding member
With the adjustment means to divide the horizontal adjustment block of With The adjusting means is Based on the detection result of the detection means, the first slit
To change the gap between the upper and lower parts by the first actuator.
By the above, the first rotary shaft holding member is displaced in the vertical direction.
Adjust and adjust the gap of the second slit to the second
By changing it with a cut-out,
Adjust the rotation shaft holding member of the
Scanning the head against the track of the tape recording medium
Correct the inclination of the trajectory Rotating drum equipment characterized by
Place 2. The rotary drum device according to claim 1, wherein the synchronizing means is a flexible joint that connects the first rotary shaft and the second rotary shaft.