JP2672891B2 - Rotating head device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a VTR, R-DAT
More particularly, the present invention relates to a rotary head device having a structure in which a rotor of a motor for rotating and driving a rotary drum is built in the rotary drum.

[0002]

2. Description of the Related Art FIG. 14 is a sectional view of an example of a conventional rotary head device. The rotating head device includes a rotating drum 1, a fixed drum 9, a motor 7, and a rotating shaft 13.

[0003] The rotating shaft 13 is rotatably held by a ball bearing 15. Ball bearing 15
Is attached to the fixed drum 9 by heat fitting and bonding.

The rotating drum 1 is disposed at a position facing the fixed drum 9. The rotating shaft 13 has a disk 3
Is installed. A rotating drum 1 is mounted on a disk 3 with mounting screws 2. A magnetic head 11 is attached to an end face of the rotating drum 1. The magnetic head 11 is rotated to scan a magnetic tape (not shown).

The disk 3 is provided with a rotor 5a of a rotary transformer. The fixed drum 9 is provided with a stator 5b of a rotary transformer. The rotor 5a of the rotary transformer and the stator 5b of the rotary transformer face each other. A predetermined air gap is provided between the rotor 5a of the rotary transformer and the stator 5b of the rotary transformer. The rotary transformer sends an electric signal to the magnetic head 11 or receives an electric signal from the magnetic head 11. This rotary transformer is a flat type.

[0006] The rotating drum 1 is arranged at one end of the rotating shaft 13. The motor 7 is arranged at the other end of the rotating shaft 13. By the motor 7, the rotating shaft 1
3 is driven to rotate. The members that are rotated by the rotation of the rotating shaft 13 are the rotating drum 1, the rotor 5a of the rotary transformer, the disk 3, and the magnetic head 11.

The problem of the rotary head device shown in FIG. 14 will be described below. With the recent miniaturization of the rotary head device, the rotary shaft 13 tends to be thin. If the rotating shaft 13 is thin,
When the rotating shaft 13 is driven to rotate by the motor 7, the rotating shaft 1
3 may be twisted. When the rotating shaft 13 is twisted, jitter occurs. Jitter manifests itself in the form of TV screen distortion.

To solve this problem, Japanese Patent Laid-Open No.
There is a rotary head device disclosed in -9013.
FIG. 15 is a sectional view of a rotary head device disclosed in Japanese Patent Application Laid-Open No. 2-9013. The rotary head device includes a rotary drum 17, a fixed drum 29, and a fixed shaft 31.

The fixed shaft 31 is passed through a ball bearing 41. A disk 43 is attached to the outer ring 27 of the ball bearing 41. As shown in FIG.
The fixed shaft 31 is attached to the fixed drum 29 by pressing the fixed shaft 31 into a hole 45 provided in the fixed drum 29.

As shown in FIG. 15, the rotating drum 17
It is arranged so as to face the fixed drum 29. The rotating drum 17 is attached to the disk 43 by the mounting screw 30.
Mounted on The head base 34 is attached to an end face of the rotating drum 17 by attaching screws 36. A head chip 35 is provided at the tip of the head base 34.
Is installed. The head base 34 and the head chip 35 constitute a magnetic head.

An earth ring 39 is attached to the fixed shaft 31. The motor stator 25 is provided with mounting screws 24
Is attached to the earth ring 39. The yoke 23 is mounted on the rotating drum 17 by mounting screws 26. The magnet 21 is attached to the yoke 23. The yoke 23 and the magnet 21 constitute a rotor of the motor. The rotating yoke 1 is provided on the rotating drum 17.
9 are attached.

An earth brush 37 is attached to the yoke 23. The earth brush 37 includes an earth ring 39
Is in contact with When the rotating drum 17 rotates, the ground brush 37 rotates around the ground ring 39 while contacting the ground ring 39. The rotating drum 17 is grounded by the ground brush 37.

The stationary drum 29 is provided with a stator 33a of a rotary transformer. Rotating drum 17
Is provided with a rotor 33b of a rotary transformer. The stator 33a of the rotary transformer and the rotor 33b of the rotary transformer face each other. A predetermined air gap is provided between the stator 33a of the rotary transformer and the rotor 33b of the rotary transformer.

In the rotary head device shown in FIG. 15, rotating components are a rotating drum 17, a rotating yoke 19, a magnet 21, a yoke 23, and a rotor 33 of a rotary transformer.
b, head base 34, head chip 35, ground brush 37, ball bearing 41, and disk 43.

In the rotary head device shown in FIG.
The rotor (yoke 23, magnet 21) of the motor for rotating the rotating drum 17 is mounted on the rotating drum 17. For this reason, even if the fixed shaft 31 is thin, the fixed shaft 31 is not twisted.

[0016]

Problems with the rotary head device shown in FIG. 15 will be described below.

(1) The fixed shaft 31 is pressed by a press-fitting technique.
It is attached to the fixed drum 29. For this reason, it was difficult to accurately obtain an air gap between the rotor 33b of the rotary transformer and the stator 33a of the rotary transformer.

The processing of the disk 43 is performed by rotating the disk 43. Fixed shaft 31 is fixed drum 2
After the disk 43 is mounted on the disk 9, the disk 43 cannot be processed. Therefore, it is necessary to process the disk 43 before attaching the fixed shaft 31 to the fixed drum 29. In this case, for example, the fixed drum 2 is
9, the rotary drum 17 can be mounted only in an inclined state.

(2) In this rotary head device,
It uses a flat plate rotary transformer. With the downsizing of the rotary head device, the thickness of the rotary transformer tends to be thin. The rotary transformer is processed by polishing. If the thickness of the rotary transformer is thin, the rotary transformer may warp during polishing.
If such a rotary transformer is used, an air gap between the stator 33a of the rotary transformer and the rotor 33b of the rotary transformer cannot be accurately obtained.

(3) In this rotary head device,
The earth brush 37 is brought into contact with the earth ring 39 attached to the outer periphery of the fixed shaft 31 to earth the rotary drum 17. Earth brush 37 and earth ring 39
The resistance of the contact portion with the rotary shaft 17 adversely affected the rotation accuracy of the rotary drum 17.

(4) Due to the miniaturization of the rotary head device,
The outer peripheral thickness of the rotary drum 17 also tends to be thin. In order to rotate the rotary drum 17 with low power consumption,
It is preferable to place the motor as outer as possible. Since the outer circumference of the rotary drum 17 is thin and the motor is arranged outside, the magnetic tape is affected by the magnetic force of the motor.

[0022]

[0023]

[0024]

The present invention has been made to solve the above conventional problems. An object of the present invention is to provide a rotary head device having a structure in which a magnetic tape is not affected by a magnetic force from a motor that rotationally drives a rotary drum and can reduce the number of parts.

[0026]

SUMMARY OF THE INVENTION A rotary head device according to the present invention rotates a magnetic head to scan a magnetic tape.

[0027]

[0028]

[0029]

Also, a rotary drive to which a magnetic head is attached.
The rotary shaft mounted on the rotary drum and the rotary shaft.
It is placed opposite the rotating drum and the rotating drum.
The fixed drum that fixes the outer ring of the bearing and the rotating drum.
The stator of the motor to be driven to rotate is opposite to the stator.
The rotor of the motor attached to the rotating drum,
Mounted on the rotating drum so that the stator is sandwiched between it and the rotor
Mounted on the fixed rotating drum and fixed drum
A stator fixing member for supporting the child, and the stator
The fixing member is a fixing portion having an upper surface to which the stator is fixed.
And / or at least one of the stator and rotor
Upright on the upper surface of the stator fixing part so that it is placed around the
And an upright portion, which is made of a magnetic material .

[0031]

[0032]

[0033]

The stator is provided between the rotor and the rotary yoke.
And is supported by the stator fixing member.
You. The stator fixing member is made of magnetic material,
A fixed portion having an upper surface to be fixed and a standing member provided on the upper surface.
The installation shields the magnetic tape from the magnetism of the stator or rotor. Therefore, this stator fixing member
Ri, magnetic tape hardly affected by the magnetic motor, a fixing member of the stator of the motor also serves as a shielding member.

[0035]

FIG. 1 is a sectional view of an embodiment of a rotary head device according to the present invention. The rotating head device includes a rotating drum 51, a fixed drum 53, a ball bearing 63, and a rotating shaft 61.

The ball bearing 63 holds the rotating shaft 61 rotatably. The fixed drum 53 fixes the outer ring 65 of the ball bearing 63. The outer ring 65 is fixed to the fixed drum 53 by heat fitting and bonding.
The fixed drum 53 is attached to the V base 55.
The V base 55 is attached to the mechanism chassis 57. An earth brush 59 is attached to the mechanism chassis 57. The ground brush 59 is in contact with the end surface of the rotating shaft 61.

A disk 82 is attached to the rotary shaft 61. The rotating drum 51 is attached to the disk 82. In one embodiment of the rotary head device according to the present invention, the rotary transformer is coaxial.
The rotor 79 of the rotary transformer is mounted on the rotating drum 51. The stator 81 of the rotary transformer is
It is attached to the fixed drum 53. The rotary transformer sends an electric signal to the magnetic head or receives an electric signal from the magnetic head. A magnetic head 77 is attached to the rotating drum 51.

The rotor 75 of the motor comprises a yoke 73 and a magnet 71. The rotor 75 of the motor is mounted on the rotating drum 51 by mounting screws 76. A rotary yoke 67 is provided at the end face of the rotor 79 of the rotary transformer. The rotating yoke 67 is fixed to the rotor 79 of the rotary transformer by the attraction force from the magnet 71.

The motor stator 69 is attached to the fixed drum 53 by means of attachment screws 70. The motor stator 69 faces the motor rotor 75.

In FIG. 1, the rotary drum 5 rotates.
1, rotating shaft 61, rotating yoke 67, motor rotor 7
5, a magnetic head 77, a rotor 79 of a rotary transformer, and a disk 82.

The outer ring 65 of the ball bearing 63 and the fixed drum 53 are fixed by using a heat fitting technique and a bonding technique. Therefore, the amount of the air gap between the rotor 75 of the motor and the stator 69 of the motor can be made more accurate than in the case where the motor is fixed using the press-fitting technique.

Further, since the disk 82 can be processed even after the ball bearing 63 is fixed to the fixed drum 53, the rotary drum 51 can be accurately mounted.

Since the rotor 75 of the motor for rotating the rotary drum 51 is attached to the rotary drum 51, the torsional resonance can be eliminated and the rotation accuracy can be improved.

Since the rotary transformer is a coaxial type,
Compared with the flat type, there is no variation in the core facing area. Since the core facing area is uniform, the transmission characteristics of the rotary transformer are:
Every channel is the same. Since the transmission characteristics of the rotary transformer are the same for all channels, there is no need to adjust the characteristics of the recording / reproducing amplifier and the like.

Since the rotary transformer is of the coaxial type, it does not warp during processing even if the thickness of the rotary transformer is thin.

The ground brush 59 is in contact with the end surface of the rotary shaft 61. Therefore, the rotation accuracy of the rotary drum 51 can be improved as compared with the rotary head device shown in FIG.

FIG. 2 is a sectional view of a magnetic head provided in an embodiment of the rotary head device according to the present invention. The magnetic head 77 includes a head base 91 and a head chip 83.
And The head base 91 is provided with mounting screws 93.
Is attached to the rotating drum 51. The end surface of the rotating drum 51 and the back surface 88 of the head base 91 are in contact. A head chip 83 and a terminal plate 89 are attached to a surface 86 of the head base 91.

A coil 101 is wound around the head chip 83. The coil 101 is fixed by the molding material 85. The coil 101 is electrically connected to the terminal plate 89. The terminal plate 89 is electrically connected to a rotary transformer (not shown). The height of the head chip 83 is adjusted by bending the head base 91 with the height adjusting screw 95.

The distance L ₁ from the tip of the head chip 83 to the end of the head base 91 is such that when the head chip 83 is mounted on the front surface 86 of the head base 91, the head chip 83 is mounted on the back surface 88 of the head base 91. It can be shorter than the case.

FIG. 3 is a plan view of a magnetic head provided in an embodiment of the rotary head device according to the present invention. As shown in FIG. 3, the head base 91 is provided with a mounting hole 97 and a notch 99. The head base 91 is fixed to the rotating drum 51 by passing the mounting screw 93 shown in FIG. Head base 91
, A head chip 83 is attached. A coil 101 is wound around the head chip 83.

The terminal plate 10 is attached to the head base 91 shown in FIG.
FIG. The coil 101 is electrically connected to the first connection portion 107 on the terminal plate 105. The second connecting portion 109 of the terminal plate 105 is a lead pin (not shown) electrically connected to the rotary transformer.
Is electrically connected to

As described above, the head chip 83
Is made by bending the head base 91. By the way, the equation of deflection of a beam is expressed as follows.

D ² y / dx ² = M / EI = 12Pl / Ebh ³ M ... bending moment E ... longitudinal elastic modulus I ... second moment of area P ... force applied from height adjusting screw l ... head base 91 The distance from the fixed part to the point of action of P (1 is represented by a lowercase cursive letter in the drawing) b ... lateral width of head base 91 h ... thickness of head base 91 Meanwhile, bending stress is σ = 6Pl / bh It is represented by ² , and the allowable stress is determined by the material. Although P for giving a predetermined displacement is determined from the displacement equation, it is also necessary that the bending stress does not exceed the allowable stress. (Because I want to use it in the range that has elasticity).

Therefore, it is preferable that the value of P is as small as possible. As a method of reducing the value of P and obtaining the desired deflection, there are cases where the value of l is increased, the value of b is decreased, and the value of h is decreased.

However, if the value of l is increased, the value of L ₁ shown in FIG. 2 increases, which is not preferable. The value of h is 0.8 m from the viewpoint of the strength and manufacturability of the head base 91.
m is the limit. Therefore, in the present invention, the value of b is reduced. The head base 91 has a terminal plate 10
5, the entire width of the head base 91 cannot be reduced. For this reason, in the present invention, the notch 99 is provided so that the terminal plate 105
And the need to reduce the width b. In addition, you may provide a through-hole instead of a notch.

FIG. 5 is a sectional view of a motor provided in an embodiment of the rotary head device according to the present invention. FIG.
FIG. 6 is a plan view of the motor shown in FIG. 5. FIG. 7 is a plan view of the stator 69 of the motor shown in FIG. FIG. 8 shows FIG.
Shield ring 1 that supports the stator 69 of the motor shown in FIG.
11 is a plan view of FIG. FIG. 9 is a cross-sectional view of the shield ring 111 shown in FIG.

As shown in FIG. 5, the rotor 75 of the motor
Is obtained by attaching a magnet 71 to a yoke 73. The rotor 75 of the motor is mounted on the rotating drum 51 by fixing the mounting boss 113 provided on the yoke 73 and the rotating drum 51 shown in FIG.

As shown in FIG. 5, the motor stator 69
Are attached to the shield ring 111. The shield ring 111 functions to maintain the flatness of the stator 69 of the motor.

As shown in FIGS. 5 and 7, the stator 69 of the motor is provided with a protrusion 121. As shown in FIG. 7, the protrusion 121 is provided with a connection hole 123. The stator 69 of the motor has a ring shape. The motor stator 69 has a plurality of drive coils 11
9 are provided. The drive coil 119 and the connection pin 117 provided on the lead wiring member 115 are electrically connected by the protrusion 121.

When the connection hole 123 shown in FIG. 7 is provided in the drive coil 119 forming portion of the stator 69 of the motor, the drive coil 119 located in that portion becomes smaller than the drive coil 119 located in other portions. For this reason, the magnetic flux generated from the drive coil 119 located at the connection hole is smaller than the magnetic flux generated from the drive coil 119 located at other portions.

By the way, the magnetomotive force is F = B · I · l (B:
Magnetic flux density, I: current, l: coil effective length). The drive coil 119 at the connection hole has a smaller coil area than the others, that is, the effective coil length is shorter and the magnetomotive force is smaller. On the other hand, in order to make the magnetomotive forces the same (compared to the same coil size example), it is necessary to increase the current from the above. As a result, power consumption increases. In the present invention, such a phenomenon does not occur because the sizes of the drive coils 119 are all the same.

As shown in FIG. 8, the shield ring 111
Is provided with a stator fixing portion 131. A rising portion 127 is provided around the stator fixing portion 131. The rising portion 127 is not provided in a portion corresponding to the protrusion 121 shown in FIG. The shield ring 111 is provided with a fixing screw hole 125. The shield ring 111 is fixed to the fixing drum 53 by attaching the fixing screw 70 shown in FIG.
Fixed to The shield ring 111 is made of a magnetic material such as permalloy.

FIG. 10 shows a stator 69 of the motor shown in FIG.
FIG. 4 is a perspective view for explaining an attached state of FIG. A step is provided on the outer periphery of the fixed drum 53, and the step forms a lead 135. The lead portion 135 regulates the running of the magnetic tape. In one embodiment of the rotary head device according to the present invention, a notch 133 is provided in a portion of the outer peripheral surface of the fixed drum 53 where the magnetic tape is not wound,
The lead wiring member 115 to which the connection pin 117 is attached is fitted in the notch 133.

FIG. 11 is an enlarged sectional view of a motor provided in an embodiment of the rotary head device according to the present invention. The ball bearing 63 holds the rotating shaft 61 rotatably. The outer ring 65 of the ball bearing 63 is fixed by the fixed drum 53. The shield ring 111 is attached to the fixed drum 53 by the attachment screw 141. The stator 69 of the motor is supported by the shield ring 111. A rising portion 127 provided on the shield ring 111 is provided between the stator 69 and the fixed drum 53 of the motor.

A disk 82 is attached to the rotary shaft 61. The rotating drum 51 is attached to the disk 82. The rotary drum 51 is provided with a rotor 79 of a rotary transformer. In the fixed drum 53,
The stator 81 of the rotary transformer is mounted.

The rotor 75 of the motor comprises a yoke 73 and a magnet 71 attached thereto. By fitting the mounting screw 76 into the mounting boss 113 provided on the yoke 73,
The rotor 75 of the motor is mounted on the rotating drum 51.

On the rotary yoke 67, the first positioning surface 13
7 and a second positioning surface 139 are provided. The positioning of the rotary yoke 67 in the thrust direction is performed by the first positioning surface 137 and the attractive force of the magnet 71. The positioning of the rotary yoke 67 in the radial direction is performed on the second positioning surface 139.

Due to the miniaturization of the rotary head device, the wall thickness of the outer peripheral portion of the fixed drum 53 tends to be thin. At present, the thickness of the outer peripheral portion of the fixed drum 53 is about 0.6 mm. On the other hand, in order to increase the number of rotations of the motor with small electric power, it is desirable that the motor is provided at a position as far as possible from the rotating shaft 61. When the motor is provided at a position away from the rotating shaft 61, the distance between the magnetic tape and the motor becomes short, and the magnetic tape is affected by the magnetic force of the motor. In one embodiment of the rotary head device according to the present invention, a rising portion 127 made of a magnetic member is provided between the stator 69 of the motor and the outer periphery of the fixed drum 53. Therefore, it is possible to prevent the magnetic tape from being affected by the magnetic force of the stator 69 of the motor. The thickness of the rising portion 127 is
If it is 0.1 mm or more, the effect of magnetic shielding can be expected.
When the rising portion 127 is further extended, the magnetic force of the rotor 75 of the motor can be shielded.

As shown in FIG. 11, in one embodiment of the rotary head device according to the present invention, the rotary yoke 67 is positioned by using the rotor 79 of the rotary transformer and the attraction force from the magnet 71. There is. Since the rotary transformer is processed by polishing, it can be processed with high precision. Since the rotor 79 of the rotary transformer is used as a reference for positioning the rotary yoke 67, the rotary yoke 67 can be accurately arranged. Further, since the rotating yoke 67 is attached by the attraction force from the magnet 71, the rotating yoke 67 can be easily attached to the rotor 79 of the rotary transformer.

FIG. 12 is a sectional view for explaining a mounting state of a rotor of a rotary transformer provided in an embodiment of the rotary head device according to the present invention. FIG.
FIG. 4 is a plan view for explaining a mounting state of a rotor of a rotary transformer provided in one embodiment of the rotary head device according to the present invention. As shown in FIG.
The reference surface 143 provided on the reference numeral 1 positions the rotor 79 of the rotary transformer in the thrust direction.
A step is provided on the outer periphery of the rotor 79 of the rotary transformer. A buffer member 145 is fixed to the outer periphery of the rotor 79 of the rotary transformer with an adhesive. The positioning of the buffer member 145 is performed by the rotor 79 of the rotary transformer.
Is carried out by a step provided on the outer peripheral surface.

The rotor 79 of the rotary transformer is attached to the rotary drum 51 by pressing the buffer member 145 with the leaf spring 147. The leaf spring 147 is attached to the mounting screw 1.
49 attaches to the rotating drum 51.

Lead pins 151 are attached to the buffer member 145. Connection portion 153 between one end of lead pin 151 and the wiring of rotor 79 of the rotary transformer
Is in a through hole 157 provided in the rotating drum 51. The other end of the lead pin 151 is electrically connected to the terminal plate 89.

As shown in FIG. 13, the buffer member 145 is provided with a recess 155. By fitting the leaf spring 147 into the concave portion 155, the rotation of the leaf spring 147 when the leaf spring 147 is mounted with the mounting screw 149 is prevented.

As shown in FIGS. 12 and 13, in one embodiment of the rotary head device according to the present invention, the leaf spring 147 mounts the rotor 79 of the rotary transformer to the rotary drum 51. Therefore, the rotor 79 of the rotary transformer can be replaced. The reason why the buffer member 145 is provided between the leaf spring 147 and the rotor 79 of the rotary transformer is as follows. The rotor 79 of the rotary transformer is made of ferrite which is a brittle material. Therefore, if the rotor 79 of the rotary transformer is directly pressed by the leaf spring 147, the rotor 79 of the rotary transformer may be damaged. As a material of the buffer member 145, a soft member such as a resin is preferable.

As shown in FIG. 12, in one embodiment of the rotary head device according to the present invention, the rotary drum 51 is provided with a connection between one end of the lead pin 151 and the rotor 79 of the rotary transformer. Since the through hole 157 is provided, the connection portion 153 can be easily soldered. The other end of the lead pin 151 comes into contact with the terminal plate 89 when the rotor 79 of the rotary transformer is mounted on the rotary drum 51. The leaf spring 147
If the rotor 79 of the rotary transformer is not damaged even if the rotor 79 of the rotary transformer is directly pressed by the above, the buffer member 145 need not be provided.

[0076]

[0077]

[0078]

[0079]

In the rotary head device of the present invention, the stator of the motor
Since the fixing member that supports the
Is less susceptible to the magnetic force of the motor, and
The number of parts is reduced because the fixed member doubles as the shield member.
Can be .

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of a rotary head device according to the present invention.

FIG. 2 is a sectional view of a magnetic head provided in an embodiment of the rotary head device according to the present invention.

FIG. 3 is a plan view of a magnetic head provided in an embodiment of the rotary head device according to the present invention.

FIG. 4 is a plan view showing a state where a terminal plate is attached to the magnetic head shown in FIG. 3;

FIG. 5 is a sectional view of a motor provided in one embodiment of the rotary head device according to the present invention.

FIG. 6 is a plan view of the motor shown in FIG.

FIG. 7 is a plan view of a stator of the motor shown in FIG.

8 is a plan view of a shield ring that supports a stator of the motor shown in FIG.

9 is a cross-sectional view of the shield ring shown in FIG.

FIG. 10 is a perspective view for explaining a mounting state of a stator of the motor shown in FIG. 7;

FIG. 11 is an enlarged sectional view of a motor provided in an embodiment of the rotary head device according to the present invention.

FIG. 12 is a cross-sectional view for explaining a mounting state of a rotor of a rotary transformer provided in an embodiment of the rotary head device according to the present invention.

FIG. 13 is a plan view for explaining a mounted state of a rotor of a rotary transformer provided in one embodiment of the rotary head device according to the present invention.

FIG. 14 is a sectional view of an example of a conventional rotary head device.

FIG. 15 is a sectional view of a rotary head device disclosed in Japanese Patent Application Laid-Open No. 2-9013.

FIG. 16 is a cross-sectional view for explaining that the fixed shaft shown in FIG. 15 is fixed to a fixed drum.

[Explanation of symbols]

 51 rotating drum 53 fixed drum 59 earth brush 61 rotating shaft 63 ball bearing 65 outer ring 67 rotating yoke 69 motor stator 75 motor rotor 77 magnetic head 79 rotary transformer rotor 81 rotary transformer stator

Claims (1)

(57) [Claims] 1. A rotary head device for rotating a magnetic head to scan a magnetic tape, comprising: a rotary drum to which the magnetic head is attached; a rotary shaft attached to the rotary drum; and the rotary shaft. A rotatably held bearing, a fixed drum that is arranged so as to face the rotary drum and that fixes the outer ring of the bearing, a stator for the motor that drives the rotary drum to rotate, and a stator that faces the stator. The rotor of the motor attached to the rotary drum, and the rotor so that the stator is sandwiched between the rotor and the rotor.
A rotating yoke attached to the drum, and a fixed member attached to the fixed drum for supporting the stator.
A stator fixing member, wherein the stator fixing member has an upper surface on which the stator is fixed.
Having a fixed part and less of the stator or rotor
And the stator to be arranged around either one
A fixed part that is erected on the upper surface of the fixed part.
A rotary magnetic head device comprising a material .