JP2863499B2 - Rotating head device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a VTR, an R-D
The present invention relates to a rotary head device used in an AT or the like, and particularly 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. The rotating shaft 1 is driven by the motor 7.
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.

FIG. 17 is a sectional view of a magnetic head provided in the conventional rotary head device shown in FIGS. The magnetic head 46 includes a head base 34 and a head chip 35. The head base 34 is mounted on the rotating drum 17 by mounting screws 36. The end surface of the rotating drum 17 and the back surface 28 of the head base 34 are in contact with each other. A head chip 35 is attached to the back surface 28 of the head base 34. A terminal plate 38 is attached to the surface 32 of the head base 34.

A coil 42 is wound around the head chip 35. The coil 42 is fixed by a molding material 44. The coil 42 is electrically connected to the terminal plate 38. The terminal plate 38 is electrically connected to a rotary transformer (not shown). The height of the head chip 35 is adjusted by bending the head base 34 with the height adjustment screw 40.

[0018]

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

(1) The fixed shaft 31 is inserted by press-fitting technology.
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) The stator of the motor for rotating the rotary drum has a ring shape and is provided with a drive coil. The electrical connection between the external wiring and the drive coil has been made at a connection portion provided in the coil forming portion. Therefore,
Since the drive coil near the connection was smaller than the other drive coils, the magnetic flux generated from the drive coil near the connection was smaller than the magnetic flux generated from the other drive coils. For this reason, the motor cannot be rotated efficiently, and power consumption has increased. The present invention has been made to solve such a conventional problem.

An object of the present invention is to provide a rotary head device having a structure capable of improving the assembling accuracy and having the same magnetic flux generated from the drive coil.

[0022]

SUMMARY OF THE INVENTION A rotary head device according to the present invention is a rotary head device for rotating a magnetic head to scan a magnetic tape. The rotary head device has a rotary drum on which a magnetic head is mounted and a rotary drum facing the rotary drum. And placed on the bottom
A stationary drum composed of a cylindrical rising portion formed on its outer periphery, a rotor of a motor mounted on the rotating drum for rotating the rotating drum, and a ring-shaped surface. The stator is sandwiched between the rotor and the stator mounted on the fixed drum so as to face the rotor, and a plurality of drive coils provided on the stator and formed in the same size. And a rotating yoke attached to the rotating drum, and the outer peripheral portion of the stator is fixed.
At the position corresponding to the rising portion of the drum, a projection having an electrical connection to the drive coil is formed, and the rising of the fixed drum located on the outer peripheral side of the rotating yoke is formed.
Notch that penetrates the inner and outer circumferences
And electrically connected to the connection section and arranged below the fixed drum.
The lead wiring member to be wired is formed at the rising portion of the fixed drum so as not to protrude from the outermost periphery of the fixed drum.
It is fitted in the notch .

The operation of the present invention will be described below.

[0024]

[0025]

The connection between the drive coil and the external wiring is
A protrusion provided on the outer periphery of the stator of the motor, and a fixed drum
With the lead wiring member fitted into the wire. others
Therefore, the drive coils can all be the same size,
Stable motor drive can be realized. In addition, fixed
Arrange the lead wiring members so that they do not protrude from the outer periphery of the
Therefore, the size of the rotary head device can be reduced .

[0027]

FIG. 1 is a sectional view of a rotary head device according to an embodiment of the present invention. The rotating head device is
Rotary drum 51, fixed drum 53, ball bearing 6
3 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 mounted on the rotating 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 Stator 81 of rotary transformer
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 stator 69 of the motor is mounted on the fixed drum 53 by mounting screws 70. (The mounting state of the stator 69 of the motor will be further described with reference to FIG. 11.)
The motor stator 69 faces the motor rotor 75.

In FIG. 1, the rotating 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 fixing of the outer ring 65 of the ball bearing 63 and the fixed drum 53 is performed by using a heat fitting technique and an adhesive 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 mounted with high accuracy.

Further, since the rotor 75 of the motor for rotating the rotary drum 51 is mounted on the rotary drum 51, torsional resonance can be eliminated and the rotation accuracy can be improved.

Further, since the rotary transformer is of the 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 coaxial, even if the thickness of the rotary transformer is reduced, it does not warp during the processing.

The ground brush 59 is in contact with the end surface of the rotating 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. The head base 91 is mounted on the rotating drum 51 by mounting screws 93.
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 in 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.
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. A head chip 83 is attached to the head base 91. 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 = 12 Pl / Ebh ³ M: bending moment E: longitudinal elastic modulus I: secondary moment of area P: force applied from a height adjusting screw l: head base 91 The distance from the fixed portion to the point of application of P (1 is represented by a lowercase cursive letter in the drawing) b: the width of the head base 91 h: the thickness of the head base 91 As a method of obtaining the deflection of
increasing the value of l, decreasing the value of b, h
May be reduced.

However, increasing the value of ₁ is not preferable because the value of L ₁ shown in FIG. 2 increases. 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. 6 is a plan view of the motor shown in FIG. FIG. 7 shows FIG.
FIG. 6 is a plan view of a stator 69 of the motor shown in FIG. FIG. 8 is a plan view of the shield ring 111 that supports the stator 69 of the motor shown in 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 stator 69 of the motor
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 projection 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 electrical connection between the drive coil 119 and the connection pin 117 (see FIG. 5) provided on the lead wiring member 115 is made by the protrusion 121.

When the connection hole 123 shown in FIG. 7 is provided in the portion where the drive coil 119 of the motor stator 69 is formed, 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 at the connection hole was smaller than the magnetic flux generated from the drive coil 119 at the other portion. For this reason, the motor cannot be rotated efficiently and power consumption increases.
This does not happen because all 9 are the same size.

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 the 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, and a connection pin 117 is attached to the notch 133. The inserted lead wiring member 115 is fitted.

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. With the fixed drum 53, the ball bearing 6
The third outer ring 65 is fixed. Shield ring 111
Are mounted on the fixed drum 53 by mounting screws 70. The stator 69 of the motor is supported by the shield ring 111. Between the stator 69 and the fixed drum 53 of the motor, there is a rising portion 127 provided on the shield ring 111.

A disk 82 is mounted on the rotating 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 mounted thereon. 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.

The rotating yoke 67 has 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.

As the size of the rotary head device is reduced, the thickness of the outer peripheral portion of the fixed drum 53 tends to be reduced. 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 motor torque with a small amount of 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,
Between the stator 69 of the motor and the outer periphery of the fixed drum 53,
There is a rising portion 127 made of a magnetic member. Therefore,
It is possible to prevent the magnetic tape from being affected by the magnetic force of the stator 69 of the motor. If the thickness of the rising portion 127 is 0.1 mm or more, an 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 6
Positioning 7 is performed using the rotor 79 of the rotary transformer and the attractive force from the magnet 71. 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 rotating yoke 67 can be accurately arranged. Also,
Since the rotation yoke 67 is attached by the attraction force from the magnet 71, the rotation yoke 67 can be easily attached to the rotor 79 of the rotary transformer.

FIG. 12 is a cross-sectional view for explaining an attached state of a rotor of a rotary transformer provided in an embodiment of the rotary head device according to the present invention. FIG.
FIG. 2 is a plan view for explaining a state of attachment of a rotor of a rotary transformer provided in an embodiment of the rotary head device according to the present invention. As shown in FIG. 12, the reference surface 143 provided on the rotating drum 51 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 a step provided on the outer peripheral surface of the rotor 79 of the rotary transformer.

The rotor 79 of the rotary transformer is attached to the rotary drum 51 by holding 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.

A lead pin 151 is 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 attachment of the rotor 79 of the rotary transformer to the rotating drum 51 is performed by a leaf spring 147. 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, one end of a lead pin 151 and a rotor 7 of a rotary transformer are provided.
9 is connected to the through-hole 15 provided in the rotary drum 51.
7, the soldering of the connection portion 153 is facilitated. 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 14
Even if you directly press the rotor 79 of the rotary transformer with 7,
If the rotor 79 of the rotary transformer is not damaged, the buffer member 145 need not be provided.

[0065]

According to the rotary head device of the present invention, the motor fixed
The size of the drive coil attached to the set
Because of this, the rotation efficiency of the motor can be increased,
Power consumption can be reduced . Furthermore, make the drive coil the same size
Notch in the fixed drum corresponding to the projections
The notch is used for lead wiring.
Therefore, the protrusion does not protrude from the outer periphery of the fixed drum.
And miniaturization can be realized .

[0066]

[0067]

[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 an 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 an attached 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.

FIG. 17 is a sectional view of a magnetic head provided in the conventional rotary head device shown in FIGS. 14 and 15;

[Explanation of symbols]

 Reference Signs List 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 83 head chip 86 front surface 88 back surface 91 Head Base 95 Height Adjustment Screw 99 Notch 119 Drive Coil 121 Projection 123 Connection Hole

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-184713 (JP, A) JP-A-62-58412 (JP, A) JP-A-1-189018 (JP, A) JP-A 61-184018 104418 (JP, A) JP-A-64-62810 (JP, A) JP-A-1-98112 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G11B 5/52

Claims (1)

(57) [Claims] 1. A rotary head device for scanning a magnetic tape by rotating a magnetic head, comprising: a rotary drum on which the magnetic head is mounted; a rotary drum disposed opposite to the rotary drum;
A fixed drum formed of a cylindrical rising portion formed on the rotating drum; a rotor of a motor mounted on the rotating drum for rotating the rotating drum; and a ring shape, the surface of which faces the rotor. A stator mounted on the stationary drum, a plurality of drive coils provided on the stator and formed to have the same size, and the stator sandwiched between the rotor and the rotor. A rotating yoke attached to the rotating drum, and an outer peripheral portion of the stator,
A position corresponding to the Chi raised portion, the protrusion formed of electrical connections are formed on the drive coil, standing of the fixed drum which is located on the outer peripheral side of the rotary yoke
A notch is formed in the raised part that penetrates the inner and outer circumferences.
And is electrically connected to the connection portion to be below the fixed drum.
The rising portion of the fixed drum so that the lead wiring member for wiring
The rotary head device is fitted in the notch formed in the rotary head device.