JP3952163B2 - Rotating head drum device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotary head drum device, and more particularly to a rotary head drum device having a rotary drum with a head attached to the outer peripheral portion.
[0002]
[Prior art]
A helical scan type magnetic recording / reproducing apparatus such as a VTR includes a rotating head drum. The rotary head drum has a magnetic head facing the outer periphery, and is arranged so as to be vertically stacked on the fixed guide drum in the axial direction. A magnetic tape is helically wound around the outer periphery of the rotary drum, and the rotary drum is attached to the rotary drum. By driving, the magnetic head is obliquely scanned on the magnetic tape to write and read signals.
[0003]
In such a helical scan type recording / reproducing apparatus, as the equipment on which it is mounted is reduced in size and weight, the rotary head drum apparatus is also reduced in size and weight, and the rotational speed tends to increase. Therefore, it is strongly required to reduce the vibration generated at the time of high-speed rotation from the viewpoint of improving the merchantability of a device equipped with this rotary head drum device. Therefore, for example, as disclosed in Japanese Patent Laid-Open No. 2001-23105, the vibration generated during high-speed rotation is reduced by adjusting the rotational balance of the rotary head drum device by attaching solder.
[0004]
Adjustment of the rotational balance in the conventional rotary head drum device is a method of soldering at a predetermined position or adhering a weight as described above. That is, when solder is not used, the weight is attached to a predetermined position of the rotary head drum with an adhesive or a double-sided adhesive tape. Alternatively, a metal having a high specific gravity is added to the adhesive to obtain a weight necessary for vibration reduction, and such an adhesive is applied and cured at a desired position on the rotating body. Alternatively, as described above, a method in which an appropriate amount of solder is heat-welded to a metal part of a rotating body or a sheet metal attached for soldering adjustment has been adopted.
[0005]
[Problems to be solved by the invention]
The method of attaching the weight to the predetermined position of the rotary drum with the adhesive or the double-sided adhesive tape is likely to cause the adhesion of the adhesive to scatter or to cause the adhesion portion to peel off, and to improve workability and reliability. There is a drawback that problems are likely to occur.
[0006]
On the other hand, a method of obtaining a weight necessary for vibration reduction by adding a metal such as copper having a high specific gravity to the adhesive, and applying and curing it on a rotating drum has a limit to the specific gravity that can be realized. There was a problem in terms of reduction in size and weight and productivity because post-treatment such as time for curing and ultraviolet irradiation was necessary.
[0007]
In the method of soldering at a predetermined position of the rotating drum, when the solder is heated and melted, the flux contained in the solder is scattered and the productivity is hindered, and the parts necessary for soldering are added. As a result, the material cost increases.
[0008]
The invention of the present application has been made in view of such problems, and eliminates the drawbacks associated with the adjustment of rotational balance by methods such as adhesives, double-sided adhesive tape, and soldering, and improves the workability of balance adjustment. It is another object of the present invention to provide a rotary head drum device that can reduce the work time and material cost.
[0009]
[Means for Solving the Problems]
The main invention of the present application is a rotary head device having a rotary drum with a head attached facing the outer periphery.
A holding member having a holding portion formed along a circumferential direction is provided on one end side in the axial direction of the rotating drum, the holding member having a holding portion along the circumferential direction, and a pressing plate having a substantially disk shape. A slit extending substantially in the radial direction is provided along the circumferential direction on the outer peripheral portion of the presser plate, and a presser portion is formed by cutting the slit.
A spherical balance weight is held at the holding portion at a predetermined position in the circumferential direction, and the balance weight is elastically deformed by a substantially radially extending slit formed on the outer peripheral portion of the presser plate, and the balance weight is pressed by the presser portion. The present invention relates to a rotary head drum device characterized in that the rotation adjustment is performed by pressing .
[0010]
Here, the pressing plate may be attached to the holding member so as to overlap with the holding member so that the outer peripheral portion of the pressing plate closes the open end in the axial direction of the holding portion including the stepped portion . Further, it is preferable that the holding member is also used as a rotor yoke of a motor that rotationally drives the rotary drum, and a step portion on the outer peripheral side of the rotor yoke is a holding portion. Moreover, the said press part may be formed in the innermost position of the innermost part or length direction of the said slit.
[0011]
Another aspect of the present invention is provided with the holding portion on one end side in the axial direction of the rotary drum, the second holding portion provided at the other side in the axial direction of the rotary drum, the holding portion and the second each at a predetermined position of the second holding portion relates rotary head drum apparatus characterized by performing rotational adjustment to hold the balance weight to form a spherical shape.
[0012]
Yet another aspect of the present invention, the tape by the arranged a rotary drum and stationary drum overlapping in the axial direction, the head provided on the rotary drum by winding a helical tape-shaped recording medium relative to said rotary drum met rotary head drum apparatus has to scan obliquely to Jo recording medium,
A motor that rotationally drives the rotating drum is disposed in the fixed drum, and the rotor of the motor is fixed to the rotating drum, and a rotary transformer is disposed on the rotating drum,
Provided with the holding portion on the outer periphery of the rotor of the motor, the a on a rotating drum to the second holding portion provided on the outer peripheral side of the rotary transformer rotor, the holding portion and the second holding portion The present invention relates to a rotary head drum device characterized in that balance weights are respectively attached at predetermined positions in the circumferential direction.
[0013]
Here, it is preferable that the second holding portion is constituted by a holding groove opened upward, and a balance weight is press-fitted and held in the holding groove.
[0014]
A preferred embodiment of the invention included in the present application is a rotary head drum device in which a tape-like recording medium is helically wound and a head attached to the rotary drum performs recording and reproduction on the tape-like recording medium. By inserting a spherical balance weight between the holding member and the disc-shaped holder, the rotation adjustment can be reduced in size and weight and the productivity can be improved.
[0015]
Still another aspect of the invention included in the present application is a metal sphere having a spherical shape while elastically deforming the presser plate at a portion between a stepped portion formed on a rotor yoke of a motor driving a rotary head drum and the presser plate. The metal sphere is held by press-fitting, and if necessary, the metal sphere is press-fitted into a predetermined position in the circumferential direction of another holding ring at a position distant from the axial direction of the rotary drum. The generation of couples during rotation of the rotating drum is eliminated.
[0016]
According to such an aspect, since it is possible to reduce the time for adjustment work for reducing vibration due to rotation, it is possible to reduce the number of vibration adjusting machines in mass production and to reduce equipment investment. Further, by using an inexpensive punched steel plate as the presser plate, the material cost can be greatly reduced. Further, by using a press plate made of a punched steel plate, the axial dimension of the rotary drum to which the press plate is attached is reduced by reducing the thickness of the press plate. Moreover, there is an advantage that the reliability with respect to falling off and scattering of the weight is improved as compared with the application and curing of the conventional adhesive tape and adhesive.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2 show the entire configuration of a rotary head drum device according to an embodiment of the present invention. The rotary head drum device includes a rotary head drum 20, a fixed guide drum 21, and an auxiliary guide. 22. Then, the video signal flexible substrate 23 is pulled out from the side surface side of the auxiliary guide 22, and the motor driving flexible substrate 24 is pulled out from the side surface side of the fixed guide drum 21.
[0018]
Next, the structure of the rotary head drum 20 will be described with reference to FIGS. The diameter of the rotary head drum 20 is, for example, 21.7 mmφ, and a head base 27 is attached to the lower surface of the rotary head drum 20, and the magnetic head is located on the tip side of the head base 27 and facing the outer peripheral side of the rotary head drum 20. 28 is supported. A support shaft 30 is inserted through the rotary head drum 20. A preload spring 29 is interposed on the outer peripheral side of the support shaft 30, and the support shaft 30 rotatably supports the rotary head drum 20 by a pair of upper and lower bearings 31 and 32. The lower end portion of the support shaft 30 is press-fitted into the center hole 33 of the lower fixed guide drum 21 shown in FIG.
[0019]
Next, the structure of the motor disposed below the rotary head drum 20 and in the fixed guide drum 21 will be described. A coil substrate 34 constituting a stator is housed and held inside the fixed guide drum 21 and on the bottom side thereof. On the other hand, a rotor yoke 36 is attached to the lower surface of the rotary head drum 20 through a terminal attachment plate 35 as shown in FIG. A magnet 37 is fixed to the lower surface of the rotor yoke 36, and this magnet 37 faces the stator coil on the coil substrate 34 through an air gap. A back yoke 38 is attached to the lower end portion of the rotary head drum 20, and the back yoke 38 is positioned below the coil substrate 34. Therefore, the rotor yoke 36 and the back yoke 38 each having the magnet 37 are arranged above and below the coil substrate 34 constituting the stator.
[0020]
Next, the structure of the rotary transformer attached to the upper side of the rotary head drum 20 will be described. The rotary transformer is attached to the upper part of the rotary head drum 20, and includes a rotor 41 that rotates together with the rotary head drum 20, and a stator 42 that is disposed above the rotor 41 so as to face the rotor 41. The stator 42 is supported on the lower surface of the mounting boss 43. The mounting boss 43 is joined to the upper end side of the support shaft 30 by press fitting.
[0021]
Next, the connection structure provided in the rotor 41 of such a rotary transformer will be described with reference to FIGS. The rotor 41 is constituted by a disk made of a magnetic material, for example, ferrite, and a plurality of grooves 46 are formed concentrically on the upper surface thereof, and inserted into the grooves 46 with windings 47 wound respectively. Has been. A terminal mounting plate 48 is mounted on the outer peripheral side of the rotor 41, and a terminal 49 is supported on the terminal mounting plate 48. In particular, the terminal 49 includes a pair of spring contacts 50 that are opened by elastic deformation as shown in FIGS. These spring contacts 50 are inclined surfaces 51 whose front end portions are opened outward. Further, the spring contact 50 having such an inclined surface 51 is cut out at both ends of the spring contact 50 to form a notch 52.
[0022]
Each of the pair of spring contacts 50 is arranged inside four guide walls 53 formed integrally with the terminal mounting plate 48. A mounting plate 54 is interposed between the terminal mounting plate 48 and the rotor 41, and a screw 57 that passes through a screw insertion hole 56 on the distal end side of the arm 55 of the mounting plate 54 is a rotary head as shown in FIG. The rotor 41 is fixed to the rotary head drum 20 by being screwed into the upper surface of the drum 20. At this time, the spring contact 50 disposed on the inner side by the guide wall 53 is positioned inside the through hole 39 of the rotary head drum 20.
[0023]
Next, the structure of the terminal attachment plate 35 attached to the lower side of the rotary head drum 20 will be described with reference to FIGS. Projecting portions 60 are formed on the terminal mounting plate 35 so as to protrude upward at positions 180 degrees apart from each other in the circumferential direction. These protrusions 60 have a wedge-shaped portion on the tip side to form an inclined guide surface 61. The protrusions 60 are provided with ribs 62 on the opposite sides thereof.
[0024]
The electrode portion 64 of the head contact terminal 63 mounted on the terminal mounting plate 35 is bent and arranged so as to extend below the inclined guide surface 61 of the protrusion 60 and to the outer surface thereof. A guide plate 65 is formed by the head contact terminal 63, and the portions on both sides of the protruding portion 60 are closed by the guide plate 65, thereby introducing the spring contact 50 to the inclined guiding surface 61 side of the protruding portion 60. I am doing so. The head contact terminal 63 includes a spring contact 66, and the spring contact 66 is crimped to a connection land of the head base 27 including the magnetic head 28.
[0025]
In the configuration as described above, when the coil of the coil substrate 34 in the fixed guide drum 21 is energized through the motor driving flexible substrate 24, the current flowing in the coil is linked to the magnetic circuit formed by the magnet 37 of the rotor yoke 36. In addition, the rotary head drum 20 is driven to rotate with respect to the fixed guide drum 21 by this motor. Accordingly, the magnetic head 28 attached so as to face the outer peripheral surface of the rotary head drum 20 is scanned obliquely with respect to the magnetic tape helically wound around the rotary head drum 20 and the fixed guide drum 21. .
[0026]
When a video signal is supplied from the outside and the signal is written on the magnetic tape by the magnetic head 28, the signal is supplied to the stator 42 of the rotary transformer on the rotary head drum 20 through the video signal flexible substrate 23. Then, this signal is transmitted to the rotor 41 side of the rotary transformer. A signal is transmitted from the rotor 41 of the rotary transformer to the electrode portion 64 of the head contact terminal 63 of the terminal mounting plate 35 through the terminal 49 and the spring contact 50 of the terminal mounting plate 48. This signal is transmitted to the magnetic head 28 supported by the head base 27 through the spring contact 66 of the head contact terminal 63 and written on the magnetic tape.
[0027]
On the other hand, when reading the signal written on the magnetic tape, the signal read by the magnetic head 28 is transmitted from the spring contact 66 of the head contact terminal 63 to the electrode portion 64, and from this electrode portion 64. It is transmitted to a terminal 49 having a spring contact 50 and transmitted from this terminal 49 to the winding 47 of the rotor 41 of the rotary transformer. Therefore, the signal generated in the winding 47 is transmitted to the fixed circuit by the video signal flexible board 23 through the stator 42 of the rotary transformer.
[0028]
Next, a structure for adjusting the balance of rotation of the rotary head drum 20 in such a rotary head drum apparatus will be described. As shown in FIGS. 2 and 5, a holding portion 69 formed of a step portion is formed on the outer peripheral side portion of the rotor yoke 36 of the motor for driving the rotary head drum 20 to rotate. The holding portion 69 is a balance weight. It is a holding part of the steel ball 70 which comprises. A pressing plate 71 which is attached to the terminal mounting plate 35 on the upper surface of the rotor yoke 36 presses the balance weight 70 and prevents it from falling off.
[0029]
The presser plate 71 is made of, for example, a punched steel plate having a thickness of 0.1 mm, and a large number of slits 72 are formed along the circumferential direction on the outer peripheral side thereof as shown in FIG. 17, FIG. 19, or FIG. Has been. In addition, in the innermost part or the middle part of the slit 72, a notch 73 constituting a presser part is formed as shown in FIG. 18, FIG. 20, or FIG. A part of the upper end side of the steel ball 70 held by the stepped portion 69 and pressed by the presser plate 71 is restrained by a notch 73 of the slit 72 on the outer peripheral side of the presser disc 71, thereby being stable at that position. Retained. Therefore, the rotation adjustment of the rotary head drum 20 can be achieved simply by inserting the steel ball 70 at a desired circumferential position of the balance weight holding portion 69 and pressing it with the notch 73 of the slit 72 of the presser plate 71.
[0030]
Moreover, as shown in FIGS. 2 and 5, the rotary head drum device of this embodiment includes a mold ring 74 on the outer peripheral side of the rotor 41 of the rotary transformer and on the upper surface of the rotary head drum 20, and this mold ring. The steel ball 76 constituting the balance weight is inserted and held in the balance weight holding groove 75 opened at the upper part of 74. Here, the steel ball 76 is press-fitted into the holding groove 75. Accordingly, it is possible to adjust the rotation at the same time at the position on the upper end side in the axial direction of the rotary head drum 20 and at the position shifted in the axial direction from the adjustment position of the balance weight holding portion 69 by the steel ball 70. With such a configuration, generation of a couple of the rotating head drum 20 during rotation is prevented.
[0031]
As described above, in the rotary head drum device according to the present embodiment, for the purpose of reducing vibration during rotation of the rotary head drum 20, the holding portion 69 and the presser on the outer peripheral side of the rotor yoke 36 attached to the rotary head drum 20 are pressed. The steel ball 70 is held in a space formed between the disk 71 and the outer periphery of the disk 71 is elastically deformed by the slit 72 and pressed into the space to be held. The steel ball 70 inserted here is held by a pressing portion 73 formed by cutting a slit 72. For this reason, a rotary head drum device which is small and light and has high productivity and reliability is provided.
[0032]
Further, the vibration of a rotating body such as the rotating head drum 20 having a thickness in the rotation axis direction is accompanied by generation of couples. In order to solve this problem, it is necessary to adjust the rotational vibration at two or more positions separated in the axial direction. Therefore, the rotary head drum device 20 of the present embodiment holds the steel ball 70 on the stepped portion 69 on the outer peripheral side of the rotor yoke 36 and at the same time, in the holding groove 75 of the mold ring 74 attached to the upper surface of the rotary head drum 20. A steel ball 76 is attached by press-fitting or bonding, thereby eliminating the occurrence of couples.
[0033]
As the presser plate 71 attached to the upper side of the rotor yoke 36 of the rotary head drum 20, a presser disc 71 having slits 72 of various shapes as shown in FIG. 17, FIG. 19, or FIG. 21 can be used. . These presser discs 71 are each provided with a presser portion 73 formed by cutting at the innermost position of the slit 72 or at an intermediate position thereof as shown in FIG. 18, FIG. 20, or FIG. The steel ball 70 is pressed and held. The space that can be utilized for the rotation adjustment can optimize the shape of the press-fit portion of the steel ball 70. Further, the material and thickness can be arbitrarily selected for optimization.
[0034]
According to such a balance adjustment method using the presser disc 71 and the step portion 69 of the rotor yoke 36, it is possible to reduce the work time of the vibration reduction adjustment work, and to reduce the number of vibration adjusters in mass production. This makes it possible to reduce capital investment. Further, by using an inexpensive steel plate as the presser disc 71, the material cost can be greatly reduced. In addition, by reducing the thickness of the presser disc 71, the axial dimension of the rotary head drum 20 can be shortened to make the rotary head drum device thinner. Further, the reliability with respect to falling off and scattering of the weight is greatly improved as compared with the conventional weight adhesion, adhesive application and curing.
[0035]
Although the invention included in the present application has been described with the illustrated embodiment, the invention of the present application is not limited to the above-described embodiment, and various modifications can be made within the scope of the technical idea of the invention. For example, the above embodiment relates to a rotary head drum device having a small rotary head drum 20 with a diameter of 21.7 mmφ, but the invention of the present application can be widely applied to rotary head drum devices of various sizes and types. It is.
[0036]
【The invention's effect】
The main invention of the present application is a rotary head device having a rotary drum having a head attached to the outer peripheral portion, and is composed of a step portion opened toward the outer peripheral side at one end side in the axial direction of the rotary drum and in the circumferential direction. A holding member having a holding portion is provided along the holding plate, and a holding plate having a substantially disk shape is provided, and a slit extending in the radial direction is provided in the outer circumferential portion of the holding plate along the circumferential direction, and cut into the slit. The presser part is formed by holding a spherical balance weight in the holding part at a predetermined position in the circumferential direction, and elastically deformed by a substantially radially extending slit formed in the outer peripheral part of the presser plate. By adjusting the balance weight, the rotation is adjusted.
[0037]
Therefore, according to such a rotary head drum device, it is possible to adjust the rotation of the rotary head drum by holding the spherical balance weight at a predetermined position in the circumferential direction of the holding portion.
[0038]
Another aspect of the present invention is provided with a holding portion on one end side in the axial direction of the rotary drum, the second holding portion provided at the other side in the axial direction of the rotary drum, the holding portion and the second holding portion Rotation adjustment is performed by holding a spherical balance weight at each predetermined position.
[0039]
Therefore, according to such a rotary head drum device, it is possible to balance the rotation by the holding portions provided on both ends in the axial direction of the rotary head drum. Occurrence can be prevented.
[0040]
According to still another aspect of the present invention, a rotating drum and a fixed drum are arranged so as to overlap each other in the axial direction, and the tape-shaped recording medium is helically wound around the rotating drum, and the head provided on the rotating drum is attached to the tape-shaped recording medium. met rotary head drum apparatus has to scan obliquely against, arranged motor for rotating the rotary drum into the fixed drum, moreover fix the rotor of the motor to the rotary drum, further rotary on a rotating drum A transformer is provided, and a holding portion is provided on the outer peripheral portion of the rotor of the motor, and a second holding portion is provided on the outer peripheral side of the rotor of the rotary transformer on the rotating drum, and a circle of the holding portion and the second holding portion is provided. A balance weight is attached to each predetermined position in the circumferential direction.
[0041]
Therefore, according to such a rotary head drum device, a predetermined position in the circumferential direction of the first holding part on the outer peripheral side of the rotor of the motor and the second holding part on the outer peripheral side of the rotary transformer on the rotary drum. By attaching a balance weight to each, it becomes possible to balance the rotation of the rotating drum and to prevent the occurrence of couples.
[Brief description of the drawings]
FIG. 1 is an external perspective view of a rotary head drum device.
FIG. 2 is a longitudinal sectional view of the relevant part.
FIG. 3 is a perspective view of a rotary head drum.
FIG. 4 is a plan view of a rotary head drum.
FIG. 5 is an assembled cross-sectional view of a rotary head drum.
FIG. 6 is a bottom view of the rotary head drum.
FIG. 7 is a plan view of a rotor of a rotary transformer.
FIG. 8 is a longitudinal sectional view of the rotor.
FIG. 9 is a bottom view of the rotor.
FIG. 10 is a side view of the rotor.
FIG. 11 is an enlarged perspective view of a main part showing a structure of a spring contact of a terminal mounting plate provided in the rotor.
FIG. 12 is a plan view of a terminal mounting plate that supports a head contact terminal.
FIG. 13 is an enlarged perspective view of a main part of a head contact terminal provided on the terminal mounting plate.
FIG. 14 is a front view of the main part of the head contact terminal.
15 is a cross-sectional view taken along line AA in FIG.
FIG. 16 is an enlarged side view of a spring contact portion of the head contact terminal.
FIG. 17 is a plan view of a presser plate.
FIG. 18 is an enlarged plan view of a slit of the presser plate.
FIG. 19 is a plan view of another presser plate.
FIG. 20 is an enlarged plan view of a slit of the presser plate.
FIG. 21 is an enlarged plan view of still another presser plate.
FIG. 22 is an enlarged plan view of a slit of the presser plate.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Rotary drum, 2 ... Head base, 3 ... Magnetic head, 4 ... Terminal mounting plate, 5 ... Head contact terminal, 6 ... Through hole, 7 ... Lead, 8 ... Rotor (rotary transformer) ), 9 ... Coil winding, 10 ... Connection board, 11 ... Connection land, 14 ... Cut, 15 ... Solder rod, 16 ... Flexible printed circuit board, 20 ... Rotary head drum, 21 ... · · · Fixed guide drum, 22 · · · Auxiliary guide, 23 · · · Flexible substrate for video signal, 24 · · · Flexible substrate for motor drive, 27 · · · Head base, 28 · · · Magnetic head, 29 · · · Preload spring Support shaft, 31, 32 ... Bearing, 33 ... Center hole, 34 ... Coil substrate (stator), 35 ... Terminal mounting plate, 36 ... Rotor yoke, 37 ... Magnet, 38 ... Bar Quoke, 39 ... Through hole, 40 ... Screw, 41 ... Rotor, 42 ... Stator, 43 ... Mounting boss, 46 ... Groove, 47 ... Winding, 48 ... Terminal mounting plate, 49 ... Terminal, 50 ... Spring contact, 51 ... Inclined surface, 52 ... Notch, 53 ... Guide wall, 54 ... Mounting plate, 55 ... Arm, 56 ... Screw insertion hole, 57 ... Screw, 60 ... Projection, 61 ... Inclined guide surface (wedge-shaped guide surface), 62 ... Rib, 63 ... Head contact terminal, 64 ... Electrode, 65 ... Guide plate, 66 ... Spring contact, 69 ... Balance weight holding part (step part), 70 Steel ball (balance weight), 71 Presser disc, 72 ... Slit, 73 ... Notch (presser part), 74 ... Mold ring, 75 ... Balance weight holding groove, 76 ... Steel ball (balance weight)

Claims (8)

In a rotary head device having a rotary drum with a head attached facing the outer periphery,
A holding member having a holding portion formed along a circumferential direction is provided on one end side in the axial direction of the rotating drum, the holding member having a holding portion along the circumferential direction, and a pressing plate having a substantially disk shape. A slit extending substantially in the radial direction is provided along the circumferential direction on the outer peripheral portion of the presser plate, and a presser portion is formed by cutting the slit.
A spherical balance weight is held at the holding portion at a predetermined position in the circumferential direction, and the balance weight is elastically deformed by a substantially radially extending slit formed on the outer peripheral portion of the presser plate, and the balance weight is pressed by the presser portion. Rotating head drum device characterized by adjusting rotation by pressing The presser plate is attached to the holding member in an axial direction so that the outer peripheral portion of the presser plate closes the open end in the axial direction of the holding portion including the stepped portion. The rotary head drum device described.   2. The rotary head drum device according to claim 1, wherein the holding member is also used as a rotor yoke of a motor that rotationally drives the rotary drum, and a step portion on an outer peripheral side of the rotor yoke is a holding portion. The rotary head drum device according to claim 1 , wherein the pressing portion is formed at the innermost portion of the slit. The rotary head drum device according to claim 1 , wherein the pressing portion is formed at an intermediate position in the length direction of the slit. Provided with the holding portion on one end side in the axial direction of said rotary drum, said second holding portion provided at the other side in the axial direction of the rotary drum, a predetermined of the holding portion and the second holding portion 2. The rotary head drum device according to claim 1, wherein rotation adjustment is performed while holding a balance weight having a spherical shape at each position. The rotating drum and the fixed drum are arranged so as to overlap in the axial direction, the tape-shaped recording medium is helically wound around the rotating drum, and the head provided on the rotating drum is inclined with respect to the tape-shaped recording medium. met rotary head drum apparatus has to scan,
A motor that rotationally drives the rotating drum is disposed in the fixed drum, and the rotor of the motor is fixed to the rotating drum, and a rotary transformer is disposed on the rotating drum,
Provided with the holding portion on the outer periphery of the rotor of the motor, the a on a rotating drum to the second holding portion provided on the outer peripheral side of the rotary transformer rotor, the holding portion and the second holding portion 7. The rotary head drum device according to claim 6, wherein balance weights are respectively attached at predetermined positions in the circumferential direction. 7. The rotary head according to claim 6 , wherein the second holding portion is configured by a holding groove which is open at an upper end portion in an axial direction , and a balance weight is press-fitted and held in the holding groove. Drum equipment.

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