JPH07307017A - Rotary drum device - Google Patents

Abstract

PURPOSE:To obtain a rotary drum device capable of exactly detecting a distance regardless of the roughness of a drum surface. CONSTITUTION:A scanner assembly 17 is fixed via an upper drum flange 6 to an upper drum shaft 8. The rear surface of this scanner assembly 17 is provided with a head 23. A lower drum shaft 15 is provided with an oscillation type distance sensor mounting flange 14 pivotally fitted thereto. An oscillation type distance sensor 1 is mounted atop this oscillation type distance sensor mounting flange 4. The oscillation type distance sensor 1 detects the distance between the front surface of the oscillation type distance sensor mounting flange 14 and the rear surface of the scanner assembly 17, thereby detecting the inclination of the upper drum shaft 8 and the lower drum shaft 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary drum device suitable for use in, for example, a video tape recorder.

[0002]

2. Description of the Related Art Conventionally, in a video tape recorder or the like, recording and / or reproduction is performed by helical scanning. That is, the magnetic head is mounted on a predetermined rotating drum device and rotated, and recording and / or reproducing is sequentially performed in a diagonal direction with respect to the longitudinal direction of the magnetic tape running while being wound on the rotating drum device.

As such a conventional rotary drum device,
First, there is a rotating drum system in which a rotating drum provided between a fixed upper drum and a fixed lower drum is rotated. Secondly, there is a rotary upper drum type which is fixed to a predetermined support member and rotates a rotary upper drum provided on the fixed drum.

By the way, in the rotary drum device having such a construction, the magnetic head fixed to the rotating middle drum or the upper drum is moved along the predetermined rotating trajectory by improving the accuracy of the rotating trajectory of the rotating middle drum or the upper drum. Can be rotated accurately.

However, in the conventional rotating drum device, when the magnetic head is replaced, the rotating drum or the rotating upper drum must be replaced, and the mounting accuracy of the rotating drum or the rotating upper drum is high. Since it is difficult to keep it at this level, it is necessary to detect the rotation accuracy of the rotating drum or the rotating upper drum and adjust it.

In this case, for example, a method is conceivable in which a sensor for detecting the rotation accuracy is provided on a rotating body that rotates together with the rotating drum or the rotating upper drum, and the output of this sensor is measured. It was necessary to use a slip ring as a method of transmitting the measurement output signal to an external circuit.

In this slip ring, as shown in FIG. 14, a plurality of sliding rings 135A to 135H are provided on a rotating member 133 which rotates integrally with a rotating body, and the sliding rings 135A to 135H are supported. A plurality of sliding contact pins 132A fixed to the member 131 via dampers 134
By slidably contacting each other through 132P, the measurement output signal from the sensor provided on the rotating body at this sliding contact portion can be sent to the circuit provided on the fixed member via the support member 131.

However, the slip ring 1 having such a structure
When 30 is used, the sliding contact pins 132A to 132A in the sliding contact portion
32P and the sliding contact rings 135A to 135H are worn,
There is a problem that it becomes difficult to reliably transmit the measurement output signal.

Considering the above-mentioned problems of the conventional rotating-drum type rotating drum device, a rotating drum device proposed by the same applicant as the present invention will be described.
FIG. 10 shows the configuration of the rotary drum device. In the rotating drum device, the fixed lower fixed drum 140 and the fixed upper fixed drum 143 are fixed to the support member 142, respectively. The fixed upper drum 143 has bearings 145A and 145.
The first rotary shaft 144 is rotatably supported via B,
The rotating drum 141 is fixed to the first rotating shaft 144. The magnetic head 120 is fixed to the peripheral side of the rotating drum 141.

On the other hand, the fixed lower drum 140 is provided with the second rotary shaft 1 via the bearings 150A and 150B.
46 is rotatably supported, and the first rotating shaft 144 and the second rotating shaft 146 are connected by a flexible joint 147. Therefore, the drive motor 16
When the second rotary shaft 146 is rotationally driven by 0, the first rotary shaft 144 rotates accordingly.

Further, the rotating body 15 is attached to the second rotating shaft 146.
0 is fixed, and a distance sensor 171 is provided on the upper side surface of the rotating body 150. Therefore, the distance sensor 171 can measure the distance between the rotating body 150 and the rotating drum 141 rotating together with the rotating body 150.

A rotary transformer 130 is provided between the second rotary shaft 146 and the fixed lower drum 140. The rotary transformer 130 sends a measurement output signal from the distance sensor 171 to a detection circuit provided on the stator side. As shown in FIG. 12, the distance sensor 171 reflects the laser light emitted from the light emitting unit 171A on the lower side surface 141A of the rotating drum 141 and receives the laser light on the light receiving unit 171B. Therefore, the light receiving unit 171 is generated according to the distance between the distance sensor 171 (that is, the rotating body 50) and the lower side surface 141A of the rotating drum 141.
The light receiving position of the laser beam at B is determined, and the light receiving position at the light receiving unit 171B changes according to the change in the distance.

FIG. 11 shows a structure of a supporting member of a rotary drum device proposed by the same applicant as the present invention. The support member 142 is provided with two slits 142C and 142D in the support member 142 that supports the rotary drum device, and is further provided with notches 142A and 142B. As a result, it is divided into an upper drum fixing block 142E that supports the fixed upper drum and a lower drum fixing block 142F that supports the fixed lower drum 140, and they are connected by a connecting portion 159.

Azimuth adjusting piezo elements 157A and 1
57B expands and contracts in the longitudinal direction (the direction of arrow d or the opposite direction) depending on the value of the applied voltage.
Therefore, the azimuth adjusting piezo elements 157A and 1
By controlling the voltage value applied to each of the 57B, contracting the azimuth adjusting piezo element 157A and extending the azimuth adjusting piezo element 157B, the upper drum fixing block 142E moves in the direction indicated by the arrow d around the fulcrum of the coupling portion 159. Lean.

On the other hand, the azimuth adjusting piezoelectric element 1
Along with extending 57A, azimuth adjusting piezo element 157
By contracting B, the upper drum fixing block 142E is tilted in the direction opposite to the direction indicated by the arrow d with the fulcrum of the coupling portion 159 as the center.

Thus, the azimuth adjusting piezo element 157
By adjusting the expansion and contraction amounts of A and 157B according to the voltage value applied to them, the locus of the magnetic head 120 is
It can be tilted in the azimuth direction with respect to the magnetic tape. This kind of adjustment is called horizontal adjustment.

In addition, by controlling the voltage value applied to the tilt adjusting piezo element 152 to extend the tilt adjusting piezo element 152, the tilt adjusting block 142G is brought closer to the lower drum fixing block 142F (direction of arrow b). ), And by contracting the piezoelectric actuator 152, the tilt adjustment block 142G can be displaced in the direction of separating from the lower drum fixing block 142F (the direction opposite to the arrow b).

Therefore, the tilt adjustment piezo element 152
By displacing the tilt adjustment block 142G with respect to the lower drum fixing block 142F in the direction of arrow b, the fixed upper drum 143 can be displaced via the upper drum fixing block 142E coupled to the tilt adjusting block 142G. . The displacement direction of the fixed upper drum 143 is the direction shown by the arrow c shown in FIG. 10 with the fulcrum of the coupling portion 165 of the support member 142 as the center.

On the other hand, the tilt adjustment piezo element 15
When the tilt adjusting block 142G is displaced in the direction opposite to the arrow b direction with respect to the lower drum fixing block 142F by 2, the fixed upper drum 143 is fixed via the upper drum fixing block 142E connected to the tilt adjusting block 142G. Can be displaced. The displacement direction of the fixed upper drum 143 is determined by the connecting portion 16 of the supporting member 142.
It is in the opposite direction to the arrow c shown in FIG.

Thus, the tilt adjustment piezo element 152
By adjusting the amount of expansion and contraction of the magnetic tape 120, the locus of the magnetic head 120 can be displaced in the vertical direction (tilt direction) with respect to the magnetic tape. Such adjustment is called vertical displacement adjustment.

FIG. 13 shows a block diagram of a reproducing circuit of a data recorder using a rotary drum device proposed by the same applicant as the present invention. The reproduction RF signal SRF obtained via the magnetic head 120 is the rotary transformer 1
It is sent to the filter 173A provided in the circuit part on the stator side through the filter 30 and reproduced R in the filter 173A.
Only the F signal SRF is extracted.

Reproduction RF output from the filter 173A
The signal SRF is frequency demodulated (F
It is M-demodulated) and then transmitted to the reproduction signal processing circuit 175A to obtain reproduction data.

A circuit board 176 is attached to the rotating body 150.
Is provided. The circuit board 176 is provided with a distance sensor 171 and a modulation circuit 172. The measurement output signal SD output from the distance sensor 171 is frequency-modulated (AM-modulated) in the modulation circuit 172, and is transmitted through the coupling capacitors C1 and C2 to the magnetic head 1.
It is superimposed on the reproduction RF signal SRF from 20.

Therefore, the measurement output signal SD is supplied to the filter 173B through the rotary transformer 130 together with the reproduction RF signal SRF. The filter 173B extracts only the modulated frequency component from the measurement output signal SD, and then supplies it to the demodulation circuit 174B.

The demodulation circuit 174B extracts the measurement output signal SD by frequency demodulating (FM demodulating) the output of the filter 173B, and supplies this to the measurement signal processing circuit 175B. The measurement signal processing circuit 175B uses the measurement output signal SD
Based on the distance sensor 171 (that is, the rotating body 150)
And the distance between the rotating drums 141 is detected, and the expansion / contraction amount of the piezoelectric actuator shown in FIG. 11 is controlled based on the detection result, thereby adjusting the rotation locus of the magnetic head 120 provided on the rotating drum 141. You can

[0026]

However, in the rotary drum device proposed by the same applicant as the applicant of the present invention, the distance sensor 171 and the laser beam emitted from the light emitting portion 171A of the rotating drum 141 are provided. Since the distance is detected by the change in the position where the light is reflected by the lower side surface 141A and is received by the light receiving section 171B, the distance detection by the laser light is performed as a positional relationship between the light emitting section 171A and the light receiving section 171B and as a reflection surface. However, there is a problem in that the surface roughness of the lower surface 141A of the drum 141 may be affected during the rotation.

In this rotary drum device, the distance sensor 171 reflects the laser beam emitted from the light emitting section 171A on the lower side surface 141A of the rotating drum 141,
Since this is received by the light receiving unit 171B and the reflection angle of the laser light is calculated as a distance, smoothness is required based on measurement accuracy, and accuracy in units of microns is required.
There is an inconvenience that it is difficult to secure the smoothness of the surface to be measured.

Further, in this rotary drum device, since the detection output of the distance sensor 171 is a pulsating flow and contains a DC component, the detection output cannot be directly passed through the rotary transformer, but must be passed through the rotary transformer in advance. Since it is necessary to perform modulation so that the above can be achieved, there is a disadvantage that an extra modulator must be provided.

Further, in the rotary drum device, if such a rotary transformer is not used, a transmission means such as a slip ring is required as in the conventional case, but in the slip ring, signal transmission is stabilized by friction. However, there is a disadvantage that the cost is increased.

The present invention has been made in view of the above points, and an object thereof is to provide a rotary drum device capable of detecting an accurate distance regardless of the roughness of the drum surface.

[0031]

As shown in FIGS. 1 to 9, the rotary drum device of the present invention has an upper shaft 8 pivotally mounted on a rotary drum 17 provided with a head 23 and a drive means 17. A predetermined signal is recorded on the tape-shaped recording medium 82 arranged so as to be in sliding contact with the head 23 by rotating the head 23 on the rotary drum 17 by connecting the lower shaft 15 to the lower shaft 15 by the connecting member 13. In the rotating drum device for reproducing and / or reproducing, the rotating drum 17 or the rotating drum 17
Oscillating means 84, 85, 1 provided on either one of the fixing members 14 provided facing each other for converting an inductive output into a frequency having an inductive element 84 having an open magnetic circuit, and the rotating drum 17 or The reacting means 83, which is provided on the other side of the fixed member 14 provided so as to face the rotary drum 17, has an inductive effect on the inductive element 84 of the oscillation means 84, 85, 1.
And a mixing means 73 for mixing the output signal of the output frequency from the oscillating means 84, 85, 1 with the reproduction signal of the head 23.
A transmission means 16 for sending the output signal and the reproduction signal mixed by the mixing means 73 from the rotary drum 17 side to the fixed member 14 side; and a separation means for extracting only the output signal from the output signal and the reproduction signal sent from the transmission means 16. Means 74,
Rotating drum adjusting means 11, 12 for adjusting the position of the rotating drum 17 with respect to the fixed member 14 based on the output signal separated by the separating means 74, and oscillating means 84, 8
5, 1 and the reacting means 83 detect the position of the rotary drum 17 with respect to the fixed member 14 as an inductive output and then convert it into a frequency, which is mixed with the reproduction signal by the mixing means 73 and output by the transmission means 16 and reproduced. A signal is sent from the rotary drum 17 side to the fixed member 14 side, and the separating means 7
4, only the output signal is extracted from the output signal and the reproduction signal, and the rotary drum adjusting means 11, 12 adjust the position of the rotary drum 17 with respect to the fixed member 14 based on the output signal.

In the rotary drum device of the present invention, as shown in FIG. 8, in the above description, the reacted means 83 is a magnetic material or a metal.

The rotary drum device of the present invention is shown in FIGS.
As shown in FIG. 3, the upper shaft 8 axially mounted on the rotary drum 17 provided with the head 23 and the lower shaft 15 axially mounted on the driving means 17 are connected by the connecting member 13, and the head 23 on the rotary drum 17 is connected. In the rotary drum device for recording and / or reproducing a predetermined signal on the tape-shaped recording medium 82 arranged so as to be in sliding contact with the head 23 by rotating
The electric conductor 9 is provided on either the rotary drum 17 or the fixed member 14 provided so as to face the rotary drum 17.
Oscillating means 91 for converting the capacitive output to a frequency,
92, 93, 1 and the rotary drum 17 or the rotary drum 1
7 is provided on the other side of the fixing member 14 provided so as to face the oscillation member 7 and is grounded to oscillate means 91, 92, 93, 1
Means 90 to react with other conductors by capacitive influence
A mixing means 73 for mixing the output signal of the output frequency from the oscillating means 91, 92, 93, 1 with the reproduction signal of the head 23, and the output signal and the reproduction signal mixed by the mixing means 73 from the rotary drum 17 side. Transmission means 16 for sending to the fixed member 14 side, and separation means 7 for extracting only the output signal from the output signal and the reproduction signal sent from the transmission means 16.
4 and rotating drum adjusting means 11 and 12 for adjusting the position of the rotating drum 17 with respect to the fixed member 14 based on the output signal separated by the separating means 74, and the oscillating means 9
1, 92, 93, 1 and the reacting means 90 detect the position of the rotary drum 17 with respect to the fixed member 14 as a capacitive output, and then convert it into a frequency, and the mixing means 73 mixes it with the reproduced signal, and the transmitting means 16 The output signal and the reproduction signal are sent from the rotary drum 17 side to the fixed member 14 side, only the output signal is extracted from the output signal and the reproduction signal by the separating means 74, and the rotary drum adjusting means 11, 12 are provided.
The position of the rotary drum 17 with respect to the fixed member 14 is adjusted based on the output signal.

In the rotary drum device of the present invention, as shown in FIG. 9, in the above description, the reaction target means 90 is a conductor.

The rotary drum device of the present invention is shown in FIGS.
As described above, in the above description, the transmission means 16 is a rotary transformer.

The rotary drum device of the present invention is shown in FIGS.
As described above, in the above description, the separating means 74, 76, 7
Reference numerals 7, 78, 79, 86, and 88 are for extracting an output signal corresponding to the sample position by the sample pulse formed in synchronization with the rotary drum 17.

The rotary drum device of the present invention is shown in FIGS.
As shown in FIG.
Reference numerals 1 and 12 have azimuth adjusting piezoelectric elements 11 and 11 ′ for adjusting the inclination of the upper shaft 8 with respect to the lower shaft 15.

The rotary drum device of the present invention is shown in FIGS.
As shown in FIG.
Reference numerals 1 and 12 have tilting piezo elements 12 for adjusting the vertical position of the upper shaft 8 with respect to the lower shaft 15.

[0039]

According to the present invention, the position of the rotary drum 17 with respect to the fixed member 14 is detected as an inductive output by the oscillating means 84, 85, 1 and the reacted means 83, and then converted into a frequency, and reproduced by the mixing means 73. The signal is mixed with the output signal and the reproduction signal by the transmission means 16 and the rotary drum 1
7 side to the fixed member 14 side, the separating means 74 extracts only the output signal from the output signal and the reproduction signal, and the rotary drum adjusting means 11 and 12 adjust the position of the rotary drum 17 with respect to the fixed member 14 based on the output signal. Therefore, the inductive output can be directly converted into a change in frequency, and the reproduced signal can be mixed without providing any modulator, and the oscillation means 84, 85,
Since the total of the detection area of the reaction target means 83 and the distance to the reaction target means 83 with respect to 1 is compared with the laser spot, the average distance is measured in a large area. Can be less affected.

Further, according to the present invention, the reaction target means 83
Is a magnetic material or a metal, so that the inductive output of the inductive element 84 changes when the magnetic material or the metal approaches, so that the smoothness of the surface to be measured can be less affected.

Further, according to the present invention, the oscillating means 91, 9
2, 93 and the reacting means 90 detect the position of the rotary drum 17 with respect to the fixed member 14 as a capacitive output, and then convert it into a frequency, mix it with the reproduced signal by the mixing means 73, and output and reproduce it by the transmitting means 16. A signal is sent from the rotary drum 17 side to the fixed member 14 side, only the output signal is taken out from the output signal and the reproduction signal by the separating means 74, and the rotary drum 17 for the fixed member 14 is outputted by the rotary drum adjusting means 11 and 12 based on the output signal. Since the position of is adjusted, the capacitive output can be directly converted into a change in frequency, and the reproduced signal can be mixed without providing any modulator, and furthermore, the oscillation means 91, 92, 93. Is the sum of the detection area of the reaction target means 90 and the distance between the reaction target means 90 and the laser spot. To, since the average distance measured in a large area, can be less affected in the smoothness of the surface to be measured.

Further, according to the present invention, the reaction target means 90
Is a conductor, the capacitive output changes as the conductor approaches, so that it is less likely to be affected by the smoothness of the measured surface.

Further, according to the present invention, the transmission means 16 comprises:
Since it is a rotary transformer, highly reliable transmission can be performed with a simple configuration.

Also according to the invention, the separating means 74, 7
6, 77, 78, 79, 86, 88 are rotary drums 17.
Since the output signal corresponding to the sample position is taken out by the sample pulse formed in synchronization with, the position of the rotary drum can be adjusted corresponding to the sample position.

Further, according to the present invention, since the rotary drum adjusting means 11, 12 have the azimuth adjusting piezo elements 11, 11 'for adjusting the inclination of the upper shaft 8 with respect to the lower shaft 15, the oscillating means 84, 85 are provided. The azimuth adjustment can be performed based on the output signals of 1 and the reacting means 83.

Further, according to the present invention, since the rotary drum adjusting means 11, 12 has the tilt adjusting piezo element 12 for adjusting the vertical position of the upper shaft 8 with respect to the lower shaft 15, the oscillating means 84, 85, 1 Further, the tilt adjustment can be performed on the basis of the output signal from the reaction target means 83.

[0047]

1 to 9 show the construction and operation of an embodiment of a rotary drum device according to the present invention. In the embodiment of the present invention, an oscillation type distance sensor is used as a distance sensor for detecting the inclination of the upper shaft in a rotary drum device of the upper shaft and the lower shaft which are separated. FIG. 1 is a plan view of an embodiment of a rotary drum device according to the present invention. Figure 2
1 is a sectional view of an embodiment of a rotary drum device according to the present invention. FIG. 2 is a sectional view taken along line AA in FIG. Figure 1
2, the upper drum 5 is a fixed upper drum, and supports the upper drum shaft 8 via ball bearings 9 and 9 '. Further, the upper drum 5 supports the upper drum 5 in advance in the direction of the upper drum shaft 8 by a preload flange 7 at a predetermined pressure.

The upper drum flange 6 which is mounted on the upper drum shaft 8 and has a disk-shaped contact portion 24 is attached to the disk-shaped scanner assembly 17 by a screw 25 so as to contact the contact portion 24. Fixed by. A head 23 is provided on the lower surface of the scanner assembly 17. A disk-shaped oscillating type distance sensor mounting flange 14 is provided on the lower drum shaft 15. The oscillation type distance sensor 1 is attached to the upper surface of the oscillation type distance sensor attachment flange 14 by the attachment member 2.

The oscillation type distance sensor 1 detects the distance between the upper surface of the oscillation type distance sensor mounting flange 14 and the lower surface of the scanner assembly 17 to detect the inclination between the upper drum shaft 8 and the lower drum shaft 15. The drive shaft of the motor 21 is attached to the lower drum shaft 15. Lower drum shaft 15
Is mechanically connected to the upper drum shaft 8 by a metal spring coupling 13. As a result, by rotating the motor 21, the oscillation type distance sensor mounting flange 14
The scanner assembly 17 is rotated in synchronization with the above, and the head 23 is rotated.

The lower drum 4 includes a rotary transformer 16
Is provided. The rotary transformer 16 is rotatably supported on the lower drum shaft 15 by ball bearings 20 and 20 '. The rotary transformer 16 includes a stator fixed to the lower drum 4 and a rotor fixed to the lower drum shaft 15.

The drum column 10 is fixed to the upper drum 5 and the lower drum 4 with screws 18 and 19. The drum support 10 has piezo elements 11 and 11 'for adjusting azimuth.
Are provided in parallel with the upper drum shaft 8 and the lower drum shaft 15. In addition, the drum support 10 is provided with a tilt adjusting piezo element 12 for the upper drum shaft 8 and the lower drum shaft 15.
It is installed vertically.

FIG. 3 is a sectional view of the upper drum assembly of an embodiment of the rotary drum device according to the present invention. The upper drum assembly includes a slip ring 30, a preload flange 7, an upper drum shaft 8, an upper drum 5, an upper drum flange 6, a scanner assembly 17, and a head 23. The upper drum 5 is provided with ball bearings 9 and 9'for mounting the upper drum shaft 8. The ball bearings 9 and 9'support the upper drum shaft 8 rotatably on the upper drum 5. There is.

A preload flange 7 for mounting the slip ring 30 is attached to the upper part of the upper drum shaft 8. At the bottom of the upper drum shaft 8, the upper drum flange 6
Is pivoted. A scanner assembly 17 having a head 23 for recording and reproducing signals on a tape (not shown) is attached to the upper drum flange 6 on the lower surface thereof. The slip ring 30 and the scanner assembly 17 are rotated by the rotation of the upper drum 5, and the head 23 is brought into sliding contact with the tape, thereby obtaining a signal from the tape and mounting it on the substrate 3 provided on the scanner assembly 17 from the slip ring 30. In this case, signals such as power supply and ground are supplied to an amplifier (not shown).

FIG. 4 is a sectional view of the lower drum assembly of an embodiment of the rotary drum device according to the present invention. The lower drum assembly includes a metal spring coupling 13, an oscillation type distance sensor assembly 14, a lower drum shaft 15, a rotary transformer 16, a lower drum 4, and a motor 21. The upper drum assembly and the lower drum assembly are mechanically coupled by a metal spring coupling 13. The metal spring coupling 13 absorbs the eccentricity and declination of the upper drum 5 with respect to the lower drum 4 when the head locus is changed, and transmits the rotation of the lower drum shaft 15 rotated by the motor 21 to the upper drum shaft 8.

The rotary transformer 16 includes a rotor 40.
And a stator 41. Rotor 40
Is fixed to the lower drum shaft 15, and the stator 41 is fixed to the lower drum 4. The rotary transformer 16 transmits the signal of the rotor 40 to the stator 41.

Further, an oscillation type distance sensor assembly 14 is provided on the lower drum shaft 15, which is mechanically coupled by a metal spring coupling 13 and has a height of a rotating scanner assembly 17 of the upper drum assembly. Is detected to detect the tilt of the upper drum shaft 8 with respect to the lower drum shaft 15.

FIG. 5 is a sectional view of a drum strut assembly of an embodiment of the rotary drum device according to the present invention. FIG. 5 is a sectional view taken along line BB in FIG. FIG. 6 is a sectional view of a drum strut assembly of an embodiment of the rotary drum device according to the present invention. FIG. 6 shows A- in FIG.
It is an A line sectional view. The drum support assembly includes a piezo holder 50, azimuth adjusting piezo elements 11, 11 ',
It is composed of a tilt adjusting piezo element 12 and a drum strut 10.

The drum strut 10 has two slits 54.
And 55 are provided, and slits 63 and 64 are further provided. As a result, it is divided into a block that supports the upper drum 5 and a block that supports the lower drum 4, and they are connected by the azimuth rotation center point 53 that is the connecting portion of the two blocks.

Azimuth adjusting piezo elements 11 and 11 '
Expands and contracts in the longitudinal direction according to the value of the applied voltage. Therefore, the azimuth adjusting piezoelectric element 11
By controlling the voltage values applied to 11 and 11 'respectively to contract the azimuth adjusting piezo element 11 and extend the azimuth adjusting piezo element 11', the upper drum 5 tilts to the right around the azimuth rotation center point 53.

On the other hand, the azimuth adjusting piezo element 1
By stretching 1 and contracting the azimuth adjusting piezo element 11 ′, the upper drum 5 tilts leftward about the azimuth rotation center point 53.

As a result, when the upper drum 5 is horizontal and the upper drum 5 is tilted rightward by the azimuth adjusting piezo elements 11 and 11 ', it is integrated with the upper drum shaft 8 rotatably supported by the upper drum 5. The converted scanner assembly 17 also tilts to the right along with the upper drum 5. As a result, the locus of the head 23 fixed to the scanner assembly 17 can be tilted with respect to the tape slidingly contacting the peripheral side surfaces of the upper drum 5 and the lower drum 4.

On the other hand, the azimuth adjusting piezo element 1
By stretching 1 and contracting the azimuth adjusting piezo element 11 ′, the upper drum 5 tilts leftward about the azimuth rotation center point 53. Therefore, the scanner assembly 17 integrated with the upper drum shaft 8 rotatably supported by the upper drum 5 also tilts leftward together with the upper drum 5.
As a result, the locus of the head 23 fixed to the scanner assembly 17 can be tilted with respect to the tape slidingly contacting the peripheral side surfaces of the upper drum 5 and the lower drum 4.

As described above, the locus of the head 23 can be tilted with respect to the tape in the azimuth direction by adjusting the expansion and contraction amounts of the azimuth adjusting piezoelectric elements 11 and 11 'according to the voltage value applied thereto. This kind of adjustment is called horizontal adjustment.

In addition, by controlling the voltage value applied to the tilt adjustment piezo element 12 to extend the tilt adjustment piezo element 12, the slits 63 and 64 are extended, and the drum support 10 approaches the lower drum 4. It is possible to displace the lower drum 4 by moving the tilt adjustment piezo element 12 and the slits 63 and 64.
It is possible to displace the drum support column 10 in the direction in which the drum support column 10 is separated from the drum support column 10.

Accordingly, when the tilt adjusting piezo element 12 displaces the drum strut 10 in the direction of approaching the lower drum 4, the upper drum assembly is displaced through the upper drum 5 connected to the drum strut 10. be able to. The upper drum assembly is displaced in the upward direction about the tilt rotation center point 62 of the drum support column 10.

On the other hand, the tilt adjustment piezo element 12
By displacing the drum support column 10 in the direction away from the lower drum 4, the upper drum assembly can be displaced via the upper drum 5 coupled to the drum support column 10. The displacement direction of the upper drum assembly is downward around the tilt rotation center point 62 of the drum support column 10.

As a result, when the upper drum 5 is displaced horizontally by the tilt adjusting piezo element 12 in a horizontal state, the upper drum 5 rotatably supported by the upper drum 5 accordingly. The scanner assembly 17 integrated with the shaft 8 also tilts upward together with the upper drum 5, and as a result, the tape of the head 23 fixed to the scanner assembly 17 slidably contacts the peripheral side surfaces of the upper drum 5 and the lower drum 4. In contrast, it can be displaced upward.

On the other hand, when the upper drum 5 is displaced horizontally by the tilt adjustment piezo element 12 while the upper drum 5 is horizontal, the upper drum 5 is correspondingly displaced.
The scanner assembly 17 integrated with the upper drum shaft 8 is also tilted downward together with the upper drum 5, and as a result, the locus of the head 23 fixed to the scanner assembly 17 is moved to the peripheral side surfaces of the upper drum 5 and the lower drum 4. It can be displaced downward with respect to the tape in sliding contact.

As described above, by adjusting the expansion / contraction amount of the tilt adjusting piezo element 12, the locus of the head 23 can be displaced in the vertical direction (tilt direction) with respect to the tape. Such adjustment is called vertical displacement adjustment.

That is, the drum strut assembly is provided with the tilt adjusting mechanism and the azimuth adjusting mechanism which utilize the elastic deformation of the drum strut 10 in order to change the posture of the upper drum assembly. The tilt direction means a direction in which the height of the winding center changes when the tape is wound around the upper drum 5 and the lower drum 4. What is the azimuth direction?
It is the direction perpendicular to the tilt direction.

In FIGS. 5 and 6, the drum strut 10 is shown.
In order to facilitate elastic deformation, slits 54, 55 are provided symmetrically with respect to the azimuth rotation center point 53. Piezo storage holes 52, 52 'for storing the azimuth adjusting piezo elements 11, 11' are provided symmetrically with the slits 54, 55 as bases.

Azimuth adjusting piezo elements 11, 11 'are stored in the piezo storage holes 52, 52'. It is sandwiched by the piezo holder 50 and the piezo preload screws 51 and 51 'at a predetermined pressure. Then, the azimuth adjusting piezo elements 11 and 11 'arranged on the left and right around the azimuth rotation center point 53 expand and contract differentially on the left and right, so that the upper drum assembly is moved to the azimuth rotation center point 5.
Can be tilted around 3. This constitutes an azimuth adjustment mechanism.

On the other hand, the tilt adjustment piezo element 12 is housed in the piezo housing hole 61 at the bottom of the drum column 10. The tilt adjustment piezo element 12 is a piezo preload screw 60.
Are sandwiched and fixed by a predetermined pressure.

The tilt of the upper portion of the drum support 10 can be changed about the tilt rotation center point 62 by expanding and contracting the tilt adjusting piezo element 12. That is, the upper drum assembly, which is attached to the upper part of the drum strut 10 by the screw 19, is inclined around the tilt rotation center point 62. This constitutes the tilt adjustment mechanism.

FIG. 7 is a conceptual diagram for explaining the operation of an embodiment of the rotary drum device according to the present invention. As described above, the upper drum assembly and the lower drum assembly are rotated in synchronization with the rotation of the motor 21 by connecting the upper drum shaft 8 and the lower drum shaft 15 with the metal coupling 13. ing. At this time, the oscillation type distance sensor 1 is attached to the oscillation type distance sensor attachment flange 14 of the lower drum assembly, and the height of a certain portion of the scanner assembly 17 is constantly measured in synchronization with the scanner assembly 17.

FIG. 7 shows the operation of this oscillation type distance sensor,
The operation of the azimuth adjustment and the tilt adjustment according to this will be described. In FIG. 7, the output signal of the oscillation type distance sensor 1 is directly frequency-modulated according to the distance information. The frequency-modulated oscillation frequency is set outside the band of the reproduced signal by the head 23. The reproduction signal from the head 23 is amplified by the amplifier 72 and then mixed with the oscillation frequency by the mixer 73.

The mixed signal mixed by the mixer 73 is taken out of the lower drum assembly via the rotary transformer 16. The mixed signal extracted to the outside by the rotary transformer 16 is separated into a head reproduction signal and a distance signal by the distance signal separation circuit 74. The distance signal is amplified by the amplifier 75, and then the sample hold circuit 7
6, 77, 78, 79. In the sample hold circuits 76, 77, 78, 79, the height information of the scanner assembly 17 corresponding to the sample points a, b, c, d is generated by the sample pulse formed in synchronization with the rotation of the scanner assembly 17. Sampling from the distance signal.

In the azimuth direction, the values of the sampling points b and d are compared in the comparator 80, and the azimuth adjusting piezo elements 11 and 11 'are differentially driven to adjust the inclination of the upper drum assembly. The azimuth adjustment range is the range of α. In the tilt direction, the values of the sample points a and c are compared by the comparator 81, and the tilt adjusting piezo element 12 is driven differentially to adjust the inclination of the upper drum assembly. The tilt adjustment range is β range.

FIG. 8 is a block diagram of a rotary drum device using an inductance type distance sensor according to an embodiment of the rotary drum device of the present invention. The signal recorded on the tape 82 is reproduced by the head 23, and the reproduced signal is reproduced by the amplifier 7
Amplify by 2. Further, the oscillation type distance sensor 1 provided in the oscillation type distance sensor assembly 14 is provided by the magnetic body 83 provided on the lower surface of the scanner assembly 17.
A change in the inductive output signal occurs in the open magnetic circuit inductor 84 of. This inductive output signal is converted into an oscillation frequency by the oscillator 85. In this case, since the frequency of the inductive output signal can be directly converted, the conversion efficiency is good.

The reproduction signal and the distance signal of the oscillation frequency are mixed by the mixer 73. The mixed signal mixed by the mixer 73 is taken out of the lower drum assembly by the rotary transformer 16. The mixed signal taken out of the lower drum assembly is supplied to the distance signal separation circuit 74. The distance signal separation circuit 74 separates the head signal a into the distance signal b. Distance signal separation circuit 7
4 is comprised by a distributor, for example.

The distance signal separated by the distance signal separation circuit 74 is amplified by the amplifier 75 and then supplied to each sample hold circuit 76, 77, 78, 79 corresponding to each sample point a, b, c, d. To be done. On the other hand, the rotation frequency detected by the drum PG oscillator 86 for detecting the rotation frequency of the rotary drum scanner assembly 17 is transmitted to the sample timing generator 88 via the amplifier 87.
Is supplied to. The sample timing generator 88 includes sampling points a, b,
The timing signals for sampling in c and d are generated.

The sampling timing signals generated by the sample timing generator 88 at the sampling points a, b, c and d of the scanner assembly 17 are supplied to the sample hold circuits 76, 77, 78 and 79. Each sample hold circuit 76, 77, 7
8 and 79, sampling points a, b, c, d
The respective distance signals of the scanner assembly 17 corresponding to the sampling timing signal in (3) are sampled and held.

The distance signals sampled and held at the sampling points b and d are supplied to the inverting input terminal and the non-inverting input terminal of the comparator 80, respectively. When the height error in the azimuth direction is detected by the comparator 80, a differential voltage is supplied to the azimuth adjusting piezo elements 11 and 11 ′ so as to eliminate this error.

The distance signals sampled and held at the sampling points a and c are supplied to the inverting input terminal and the non-inverting input terminal of the comparator 81, respectively.
When the height error in the tilt direction is detected by the comparator 81, a differential voltage is supplied to the tilt adjusting piezo element 12 so as to eliminate this error.

According to the above example, the oscillating type distance sensor 1 including the open magnetic circuit inductor 84 and the oscillator 85 as the oscillating means and the magnetic body 83 as the reacting means allows the oscillating type distance sensor mounting flange as the fixing member. Scanner assembly 17 as a rotating drum for 14
Position is detected as an inductive output and then converted into a frequency, mixed with a reproduction signal by a mixer 73 as a mixing means, and the output signal and the reproduction signal are mixed by a rotary transformer 16 as a transmission means with a scanner assembly 17 as a rotary drum. Side to the oscillating type distance sensor mounting flange 14 side as a fixing member, the distance signal separating circuit 74 as separating means extracts only the output signal from the output signal and the reproduction signal, and the azimuth adjusting piezo element 11 as the rotating drum adjusting means. , Tilt adjustment piezo element 1
2 adjusts the position of the scanner assembly 17 as a rotating drum with respect to the oscillation type distance sensor mounting flange 14 as a fixed member based on the output signal.
Can directly convert the inductive output to changes in frequency,
Further, the reproduced signals can be mixed without providing any modulator, and moreover, the magnetic body 83 as the reaction target means of the oscillation type distance sensor 1 including the open magnetic circuit inductor 84 and the oscillator 85 as the oscillation means. Since it is the sum of the distance between the detection part area and the magnetic body 83 as the reaction target means, the average distance measurement in a large area is performed as compared with the laser spot, so that the smoothness of the measurement surface is affected. It can be hard to receive.

According to the above example, the means to be reacted 83 is
Since it is a magnetic material or a metal, the inductive output of the open magnetic circuit inductor 84 as an inductive element is changed by approaching the magnetic material or the metal so that the smoothness of the measured surface is less likely to be affected. be able to.

Further, according to the above example, since the transmission means 16 is a rotary transformer, it is possible to perform highly reliable transmission with a simple structure.

Further, according to the above example, the distance signal separating circuit 74 and the sample and hold circuits 76 and 7 as the separating means.
7, 78, 79, the drum PG oscillator 86, and the sample timing generator 88 extract the output signal corresponding to the sample position by the sample pulse formed in synchronization with the scanner assembly 17 as the rotating drum. Correspondingly, the position of the scanner assembly 17 as a rotating drum can be adjusted.

Further, according to the above example, since the rotary drum adjusting means 11, 12 have the azimuth adjusting piezo elements 11, 11 'for adjusting the inclination of the upper shaft 8 with respect to the lower shaft 15, the oscillating means 84, 85 are provided. The azimuth adjustment can be performed based on the output signals of 1 and the reacting means 83.

Further, according to the above example, since the rotary drum adjusting means 11, 12 have the tilt adjusting piezo element 12 for adjusting the vertical position of the upper shaft 8 with respect to the lower shaft 15, the oscillating means 84, 85, 1 Further, the tilt adjustment can be performed on the basis of the output signal from the reaction target means 83.

FIG. 9 is a block diagram of a rotary drum device using a capacitive distance sensor according to an embodiment of the rotary drum device of the present invention. The rotating drum device of this example differs from the rotating drum device shown in FIG. 8 in that an inductance type distance sensor is used as the oscillation type distance sensor 1 in FIG. The point is that a capacitive distance sensor is used as the mold distance sensor. Below, FIG.
The description of those described in 1 above will be simplified.

In FIG. 9, the signal recorded on the tape 82 is reproduced by the head 23, and this reproduced signal is reproduced by the amplifier 7
Amplify by 2. The scanner assembly 90 is a conductor and is grounded, and a capacitive output signal is provided between the lower surface of the scanner assembly 90 and the conductor 91 of the capacitive distance sensor provided in the oscillation type distance sensor 1. Cause changes. This capacitive output signal is converted to the oscillation frequency by the oscillator 93. This allows
The capacitive output signal can be directly converted to frequency.

The reproduction signal and the distance signal of the oscillation frequency are mixed by the mixer 73. The mixed signal mixed by the mixer 73 is taken out of the lower drum assembly by the rotary transformer 16. The mixed signal taken out of the lower drum assembly is supplied to the distance signal separation circuit 74. The distance signal separation circuit 74 separates the head signal a into the distance signal b.

The distance signal separated by the distance signal separation circuit 74 is amplified by the amplifier 75 and then supplied to each sample hold circuit 76, 77, 78, 79 corresponding to each sample point a, b, c, d. To be done. On the other hand, the rotation frequency detected by the drum PG oscillator 86 for detecting the rotation frequency of the rotary drum scanner assembly 17 is transmitted to the sample timing generator 88 via the amplifier 87.
Is supplied to.

The sampling timing signals generated by the sample timing generator 88 at the sampling points a, b, c and d of the scanner assembly 17 are supplied to the sample hold circuits 76, 77, 78 and 79.

When the comparator 80 detects a height error in the azimuth direction, the distance signals sampled and held at the sampling points b and d are sent to the azimuth adjusting piezo elements 11 and 11 'so as to eliminate the error. Supply a dynamic voltage.

Further, when the comparator 81 detects a height error in the tilt direction, the distance signals sampled and held at the sampling points a and c are differentially fed to the tilt adjusting piezo element 12 so as to eliminate the error. Supply the voltage of.

According to the above example, the conductor 9 as the oscillating means
1, the resonance circuit 92, the oscillator 93, and the conductor 90 as a reaction target means detect the position of the scanner assembly 17 as a rotating drum with respect to the oscillation type distance sensor mounting flange 14 as a fixed member as a capacitive output, and then detect the frequency. A mixer 73 for converting and mixing
Is mixed with the reproduction signal by the rotary transformer 16 as the transmission means, and the output signal and the reproduction signal are sent from the scanner assembly 17 side as the rotary drum to the oscillation type distance sensor mounting flange 14 side as the fixing member, and the distance as the separation means. Only the output signal is taken out from the output signal and the reproduction signal by the signal separation circuit 74, and the azimuth adjusting piezo element 11 as the rotating drum adjusting means,
A scanner assembly 17 as a rotary drum for an oscillation type distance sensor mounting flange 14 as a fixed member based on an output signal by the tilt adjustment piezo element 12.
Since the position of is adjusted, the capacitive output can be directly converted into a change in frequency, and the reproduced signal can be mixed without providing any modulator, and moreover, the conductor 91 as the oscillating means. , The total of the distance between the detection portion area of the conductor 91 as the capacitive element of the resonance circuit 92 and the oscillator 93 and the conductor 90 as the reaction target means, and therefore, in a large area compared with the spot of the laser. Since the average distance is measured, it is possible to make it less susceptible to the smoothness of the surface to be measured.

Further, according to the above example, the means 90 to be reacted is
Since it is a conductor, it is possible to make the capacitive output change due to the proximity of the conductor so that it is less likely to be affected by the smoothness of the surface to be measured.

[0100]

According to the present invention, the position of the rotary drum with respect to the fixed member is detected as an inductive output by the oscillating means and the reacted means, and then converted into a frequency, which is mixed with the reproduced signal by the mixing means, and then the transmitting means. The output signal and the reproduction signal are sent from the rotary drum side to the fixed member side by means of the separating means, only the output signal is taken out from the output signal and the reproduction signal by the separating means, and the position of the rotary drum with respect to the fixed member is determined based on the output signal by the rotary drum adjusting means. Since the adjustment is performed, the inductive output can be directly converted into the change in frequency, and the reproduced signal can be mixed without providing any modulator, and the inductive element of the reaction target means with respect to the oscillation means. Since it is the sum of the distance between the detection area and the reaction target, the average distance is measured in a large area compared to the laser spot. Is performed, it is possible to easily influenced the smoothness of the surface to be measured.

Further, according to the present invention, since the reaction target means is a magnetic material or a metal, the inductive output of the inductive element is changed by approaching the magnetic material or the metal, and the surface to be measured is changed. Can be made less susceptible to the smoothness of.

Further, according to the present invention, the position of the rotary drum with respect to the fixed member is detected as a capacitive output by the oscillating means and the reacted means, and then converted into a frequency, which is mixed with the reproduced signal by the mixing means, and the transmitting means. The output signal and the reproduction signal are sent from the rotary drum side to the fixed member side by means of the separating means, only the output signal is taken out from the output signal and the reproduction signal by the separating means, and the position of the rotary drum with respect to the fixed member is determined based on the output signal by the rotary drum adjusting means. Since the adjustment is performed, the capacitive output can be directly converted into a change in frequency, and the reproduced signal can be mixed without providing any modulator, and moreover, the capacitive element of the reacted means with respect to the oscillating means. Since it is the sum of the distance between the detection part area of and the reaction means, compared to the laser spot,
Since the average distance is measured in a large area, it is possible to reduce the influence of the smoothness of the surface to be measured.

Further, according to the present invention, since the reacting means is a conductor, the capacitive output changes when the conductor approaches, so that the smoothness of the surface to be measured is less likely to be affected. can do.

Further, according to the present invention, since the transmission means is a rotary transformer, it is possible to perform highly reliable transmission with a simple structure.

Further, according to the present invention, the separating means extracts the output signal corresponding to the sample position by the sample pulse formed in synchronization with the rotary drum, so that the position of the rotary drum can be determined corresponding to the sample position. Can be adjusted.

Further, according to the present invention, the rotary drum adjusting means has the azimuth adjusting piezo element for adjusting the inclination of the upper shaft with respect to the lower shaft. Therefore, based on the output signals from the oscillating means and the reacted means, You can make adjustments.

Further, according to the present invention, since the rotary drum adjusting means has the tilt adjusting piezo element for adjusting the vertical position of the upper shaft with respect to the lower shaft, based on the output signals from the oscillating means and the reacted means, The tilt can be adjusted.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of a rotary drum device of the present invention.

FIG. 2 is a sectional view of an embodiment of the rotary drum device of the present invention.

FIG. 3 is a diagram showing a configuration of an upper drum assembly of an embodiment of the rotary drum device of the present invention.

FIG. 4 is a diagram showing a configuration of a lower drum assembly of an embodiment of the rotary drum device of the present invention.

FIG. 5 is a diagram showing a configuration of a drum strut assembly of an embodiment of the rotary drum device of the present invention.

FIG. 6 is a diagram showing a configuration of a drum support assembly of an embodiment of the rotary drum device of the present invention.

FIG. 7 is a diagram for explaining the operation of one embodiment of the rotary drum device of the present invention.

FIG. 8 is a block diagram of a rotary drum device using an inductance type distance sensor according to an embodiment of the rotary drum device of the present invention.

FIG. 9 is a block diagram of a rotary drum device using a capacitive distance sensor according to an embodiment of the rotary drum device of the present invention.

FIG. 10 is a diagram showing a configuration of a rotary drum device which the applicant of the present invention has previously filed.

FIG. 11 is a diagram showing a configuration of a supporting member of a rotary drum device which the applicant of the present invention has previously filed.

FIG. 12 is a diagram showing measurement by a distance sensor of a rotary drum device previously filed by the applicant of the present invention.

FIG. 13 is a diagram showing a configuration of a reproducing apparatus using a rotary drum device, which the applicant of the present invention has previously filed.

FIG. 14 is a view showing a slip ring used in a conventional rotary drum device.

[Explanation of symbols]

 1 Oscillation type distance sensor 2 Mounting member 3 Substrate 4 Lower drum 5 Upper drum 6 Upper drum flange 7 Preload flange 8 Upper drum shaft 9 Ball bearing 9'Ball bearing 10 Drum support 11 Azimuth adjusting piezo element 11 'Azimuth adjusting piezo element 12 Aori Adjustment piezo element 13 Metal spring coupling 14 Oscillation type distance sensor mounting flange 15 Lower drum shaft 16 Rotary transformer 17 Scanner assembly 18 Screw 18 'Screw 19 Screw 19' Screw 20 Ball bearing 20 'Ball bearing 21 Motor 22 Screw 23 Head 24 Contact part 25 Screw 30 Slip ring 40 Rotor 41 Stator 50 Piezo holder 51 Piezo preload screw 51 'Piezo preload screw 52 Piezo storage hole 52' Piezo storage hole 53 Ajima Adjustment center point 54 Slit 55 Slit 60 Piezo preload screw 61 Piezo storage hole 62 Tilt rotation center point 63 Slit 72 Amplifier 73 Mixer 74 Distance signal separation circuit 75 Amplifier 76 Sample hold circuit 77 Sample hold circuit 78 Sample hold circuit 79 Sample hold Circuit 80 Comparator 81 Comparator 82 Tape 83 Magnetic material 84 Open magnetic circuit inductor 85 Oscillator 86 Drum PG oscillator 87 Amplifier 88 Sample timing generator 90 Scanner assembly 91 Conductor 92 Resonant circuit 93 Oscillator

Claims (8)

[Claims] 1. An upper shaft axially mounted on a rotary drum provided with a head and a lower shaft axially mounted on a drive means are connected by a connecting member to rotate the head on the rotary drum, In a rotary drum device for recording and / or reproducing a predetermined signal on a tape-shaped recording medium arranged so as to be in sliding contact with the head, one of the rotary drum and a fixing member provided facing the rotary drum. And an oscillating means for converting an inductive output into a frequency having an inductive element of an open magnetic circuit, and the other of the rotating drum or a fixing member provided facing the rotating drum, The reacting means that inductively influences the inductive element of the means, mixing means for mixing an output signal of the output frequency from the oscillating means with the reproduction signal of the head, and the mixing means. Transmission means for sending the output signal and the reproduction signal mixed by the stage from the rotary drum side to the fixed member side, and a separation means for extracting only the output signal from the output signal and the reproduction signal sent from the transmission means Means, and rotating drum adjusting means for adjusting the position of the rotating drum with respect to the fixed member based on the output signal separated by the separating means, wherein the oscillating means and the reacted means allow the rotating member to adjust to the fixing member. After detecting the position of the rotary drum as an inductive output, it is converted into a frequency, mixed with the reproduction signal by the mixing means, and the output signal and the reproduction signal are transmitted from the rotary drum side to the fixed member side by the transmission means. To the output signal and the reproduction signal from the output signal by the separating means, Serial rotary drum apparatus by rotating the drum adjusting means based on the output signal, characterized in that to adjust the position of the rotary drum with respect to the fixed member. 2. The rotary drum device according to claim 1, wherein the reaction target means is a magnetic material or a metal. 3. An upper shaft axially attached to a rotary drum provided with a head and a lower shaft axially attached to a driving means are connected by a connecting member to rotate the head on the rotary drum, In a rotary drum device for recording and / or reproducing a predetermined signal on a tape-shaped recording medium arranged so as to be in sliding contact with the head, one of the rotary drum and a fixing member provided facing the rotary drum. An oscillating means having a conductor for converting a capacitive output to a frequency, and an oscillating means provided on the other of the rotating drum or a fixed member provided so as to face the rotating drum and grounded. And a mixing means for mixing an output signal of the output frequency from the oscillating means with a reproduction signal of the head, Transmitting means for sending the output signal and the reproduction signal mixed by the mixing means from the rotary drum side to the fixed member side; and only the output signal from the output signal and the reproduction signal sent from the transmitting means. And a rotating drum adjusting means for adjusting the position of the rotating drum with respect to the fixing member based on the output signal separated by the separating means, and the fixing means by the oscillating means and the reacted means. The position of the rotary drum with respect to the member is detected as a capacitive output, converted to a frequency, mixed with the reproduction signal by the mixing means, and the output signal and the reproduction signal are fixed by the transmission means from the rotary drum side. Sent to the member side, and the separating means extracts only the output signal from the output signal and the reproduction signal. Out, rotary drum apparatus being characterized in that to adjust the position of the rotary drum with respect to the fixing member based on the output signal by the rotary drum adjusting means. 4. The rotary drum device according to claim 3, wherein the reaction target means is a conductor. 5. The rotary drum device according to claim 1 or 3, wherein the transmission means is a rotary transformer. 6. The rotary drum device according to claim 1 or 3, wherein the separating means extracts the output signal corresponding to the sample position by a sample pulse formed in synchronization with the rotary drum. Rotating drum device. 7. The rotary drum device according to claim 1, wherein the rotary drum adjusting means has an azimuth adjusting piezo element for adjusting the inclination of the upper shaft with respect to the lower shaft. apparatus. 8. The rotary drum device according to claim 1, wherein the rotary drum adjusting means includes a tilt adjusting piezo element for adjusting the vertical position of the upper shaft with respect to the lower shaft. Drum device.