JP2002133623A - Rotating drum device and magnetic record playback device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotating drum device which makes is possible to prevent a solder from flowing into the inside of the drum with certainty without the number of parts increased. SOLUTION: As the constitution of the rotating drum device having a motor stator 14 with a projecting part 18, as one united body, on which plural of land parts are formed, a slit hole 21 which can mate with the projecting part 18 and the plural of land parts 22 formed close to the slit hole 21 corresponding to the land part 19 on a side of the motor stator 14, and provided with a flexible printed board 16 for driving the motor soldered to the motor stator 14 using the land parts 19, 22, no gaps are made to be formed in a part to which the solder is supplied by setting a measure of the shorter side of the slit hole 21 in the flexible printed board smaller than the measure in the thickness of the projecting part 18.

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 on which a magnetic head is mounted and a magnetic recording / reproducing device using the same.

[0002]

2. Description of the Related Art Rotary drum devices compatible with a helical scan system are used in magnetic recording / reproducing devices such as video tape recorders, audio tape recorders, and data storage systems for computers using a magnetic tape as a recording medium. The rotary drum device is equipped with a magnetic head for actually recording a signal on a magnetic tape and reproducing a signal recorded on the magnetic tape.

In a rotating drum device, a magnetic head is mounted on a rotating drum having a predetermined inclination with respect to a running direction of a magnetic tape, and the rotating drum is rotated by a motor, so that the rotating head is rotated in a running direction of the magnetic tape. The magnetic head is slid (traced) diagonally.

Here, the motor for driving the rotary drum constitutes an element of the rotary drum device together with a wiring board for supplying the motor drive power thereto. A flexible wiring board is used as a wiring board for supplying motor drive power. The flexible wiring board is electrically connected to a motor stator (motor stator), and a specific connection method between them is soldering or a contact method using a connector.

In recent years, in order to reduce the size and thickness of a rotary drum device and a magnetic recording / reproducing device using the same, a motor for driving the rotary drum is incorporated inside a fixed lower drum. Things are known. In such a configuration, if the above-described contact method is adopted as the connection method between the motor stator and the flexible wiring board, it is necessary to secure a mounting space for the connector, which contradicts the original purpose of miniaturization. Therefore, in such a configuration, a method in which the motor stator and the flexible wiring board are connected by soldering which is advantageous for space saving is adopted.

FIG. 8 is a perspective view showing the arrangement of components when the motor stator and the flexible wiring board are connected by soldering. In FIG. 8, a motor stator 52 is incorporated in a lower drum 51. The lower drum 51 has a cylindrical structure with a concave cross section, and has a peripheral wall formed with an elongated hole 53 along the circumferential direction. Motor stator 5
Numeral 2 generally has a substantially disc shape, and a protruding portion 54 is integrally formed on an outer peripheral portion thereof. This protrusion 54
It is arranged so as to protrude outside the lower drum 51 through the elongated hole 53. Land portions 55 for soldering are formed on the front and back surfaces of the protruding portions 54, respectively.

On the other hand, the flexible wiring board 56
Is integrally formed with a contact portion 57 that is in contact with the outer peripheral surface of the lower drum 51. The contact portion 57 is formed with a slit hole 58 that can be fitted into the projecting portion 54 of the motor stator 52, and further has a land portion 59 for soldering over the slit hole 58. In the contact portion 57 of the flexible wiring board 56, the slit hole 5
8 is a boundary between one (upper part in the figure) and the other (lower part in the figure) land parts 59, one of the land parts 59 is a protruding part 54.
And the other land portion 59
Corresponds to a land portion (not shown) on the rear surface side of the protrusion 54.

When the motor stator 52 and the flexible wiring board 56 are connected by soldering, the slit holes 58 are fitted into the projecting portions 54 of the motor stator 52 projecting outside the lower drum 51, and the lower drum 51 Flexible wiring board 5 using an adhesive or an adhesive sheet on the outer peripheral surface of
6 are bonded. As a result, the land portion 55 of the motor stator 52 and the corresponding land portion 59 of the flexible wiring board 56 are in a state of being close to each other at a right angle. In this state, both land portions 5
By supplying an appropriate amount of solder 60 to the heated portions while heating 5, 59 as shown in FIG. 9, the motor stator 52 and the flexible wiring board 56 are electrically connected.

[0009]

Conventionally, when the motor stator 52 and the flexible wiring board 56 are soldered, the protrusions 54 and the slit holes 5 are used.
8, a gap G (see FIG. 9) is formed in the vertical direction of the drum. On the other hand, the solder 60 is supplied so as to cover the gap. Therefore, the protrusion 54 and the slit hole 5
The solder 60 may flow into the lower drum 51 through the gap G of No. 8. Such inflow of solder is a serious problem that impairs the quality of the rotary drum device. In other words, the rotating part of the rotating drum device comes into contact with the stationary part (fixed part) due to the solder flowing into the drum, which leads to poor rotation operation. Further, when the solder flowing into the drum straddles between the conductor pattern of the motor stator 52 and the lower drum 51, rotation failure due to poor motor insulation is caused.

As a countermeasure, a means for adding a component for preventing solder inflow can be considered. However, in such a case, an increase in the number of components leads to an increase in material cost and processing cost, and an increase in mounting of the component for preventing solder inflow. The additional increase in the depth dimension of the soldered portion causes another problem that the entire rotary drum device becomes large.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and an object of the present invention is to provide a rotating device capable of reliably preventing the flow of solder into a drum without increasing the number of components. An object of the present invention is to provide a drum device and a magnetic recording / reproducing device using the same.

[0012]

According to the present invention, there is provided a rotary drum device comprising: a motor stator integrally having a projection formed with a plurality of lands; a slit hole which can be fitted in the projection; A plurality of lands formed in the vicinity of the slit holes corresponding to the lands on the stator side, and a flexible wiring for driving the motor which is soldered to the motor stator using the lands. And a substrate,
In addition, the short dimension of the slit hole of the flexible wiring board is set to be equal to or less than the thickness dimension of the protruding portion. Further, a magnetic recording / reproducing apparatus according to the present invention uses the rotary drum device having the above configuration.

In the rotary drum device and the magnetic recording / reproducing apparatus having the above-described configurations, the short dimension of the slit hole of the flexible wiring board is set to be equal to or less than the thickness dimension of the projecting section of the motor stator, so that the projecting section has the slit hole. When the two are fitted, no gap is formed between the two in the vertical direction of the drum, thereby preventing the flow of solder into the drum.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a side sectional view showing a configuration of a rotary drum device according to an embodiment of the present invention. In FIG. 1, a rotary drum device 1 has a configuration including a rotary drum 2 formed of aluminum, and fixed upper and lower drums 3 and 4 arranged so as to sandwich the rotary drum 2 from above and below. I have. A magnetic head 5 for recording and reproduction is attached to the rotating drum 2. Magnetic head 5
Is mainly composed of a head base and a head chip, and is positioned and fixed to the rotating drum 2 by screwing.

The upper drum 3 and the lower drum 4 are press-fitted into the upper and lower ends of a rotating shaft 6, respectively. On the rotating shaft 6,
A pair of upper and lower bearings 7A and 7B and a tension spring (compression coil spring) 8 are mounted. The pair of bearings 7a and 7b are integrated with the inner rotating shaft 6 and also with the outer flange member 9 integrally.
The tension spring 8 is mounted so as to urge the bearings 7A, 7B in a direction away from each other in order to remove a rotational shake or the like of the rotary drum 2 due to a play in mounting the bearings 7A, 7B and the rotary support shaft 8. I have.

On the other hand, the rotary drum 2 is mounted on the outer peripheral side of the flange member 9 at the mounting position of the upper bearing 7A. Between the rotating drum 2 and the upper drum 3, a rotary transformer stator 10 and a rotary transformer rotor 11 are incorporated. On the other hand, a motor rotor (motor rotor) 13 accommodated in a motor case 12, a corresponding motor stator (motor stator) 14, and a back yoke 15 are incorporated in the lower drum 4. The lower drum 4 is attached to the motor stator 14.
A flexible wiring board 16 for driving the motor is electrically connected from the outside.

The lower drum 4 has a cylindrical structure with a concave cross section, and has a peripheral wall formed with an elongated hole 17 extending in the circumferential direction. As shown in FIG. 2, the motor stator 14 has a substantially disk shape as a whole, and a protrusion 1
8 are integrally formed. This protruding portion 18 is
7 and protrudes outside the lower drum 4. Land portions 19 for soldering are formed on the front and back surfaces of the protruding portion 18, respectively.

On the other hand, the flexible wiring board 16
Is formed by forming a wiring pattern on a film of, for example, polyester or polyimide with a copper foil or the like, and has an appropriate flexibility. This flexible wiring board 16
, An abutting portion 20 that abuts on the outer peripheral surface of the lower drum 4 is integrally formed. As shown in FIG. 2, the contact portion 20 has a slit hole 21 that can be fitted into the projecting portion 18 of the motor stator 14.
A land portion 22 for soldering is formed in a state of straddling one. One side of the contact portion 20 of the flexible wiring board 16 with the slit hole 21 as a boundary (upper part of the drawing)
And the other (lower in the figure) land portions 22, one land portion 22 corresponds to the land portion 19 on the front surface side of the projection 18, and the other land portion 22 corresponds to the land portion on the back surface side of the projection 18 ( (Not shown).

When the motor stator 14 and the flexible wiring board 16 are connected by soldering, the slit holes 21 are fitted into the projecting portions 18 of the motor stator 14 projecting outside the lower drum 4 and the lower drum 4 is connected. The contact portion 17 of the flexible wiring board 16 is adhered to the outer peripheral surface of the flexible wiring board 16 using an adhesive or an adhesive sheet. As a result, as shown in FIG. 3, the land portion 19 of the motor stator 14 and the corresponding land portion 22 of the flexible wiring board 16 are in a state of being close to each other at a right angle to each other. By supplying an appropriate amount of solder 23 while heating the lands 19 and 22, the motor stator 14 and the flexible wiring board 16 are electrically connected.

In the rotary drum device 1 having the above structure,
The drive of the rotating drum drive motor including the motor rotor 13 and the motor stator 14 causes the bearings 7A, 7B
The rotating drum 2, the motor case 12, the motor rotor 13, the back yoke 15, and the like rotate integrally with the flange member 9 fitted into the flange member 9. As a result, the magnetic head 5 slides on the surface of the magnetic tape while rotating (circularly moving) together with the rotary drum 2.

The rotary drum device 1 is used in a magnetic recording / reproducing device using a magnetic tape as a recording medium, for example, a magnetic recording / reproducing device such as a video tape recorder, an audio tape recorder, and a data storage system for a computer.

Here, in the rotary drum device 1 according to the embodiment of the present invention, as one of the characteristic portions, FIG.
As shown in (A) and (B), the flexible wiring board 1
6, the short dimension H of the slit hole 21 is
Is set to be equal to or less than the thickness dimension T of the projecting portion 18. However, when the short dimension H of the slit hole 21 is set smaller than the thickness dimension T of the projection 18, the slit 21 is fitted to the projection 18 when the motor stator 14 and the flexible wiring board 16 are soldered. It is necessary to appropriately set the dimensions H and T within a range in which the fitting state between the two can be obtained.

When the motor stator 14 having the dimensions H and T set as described above and the flexible wiring board 16 are to be soldered, the protrusions 18 of the motor stator 14 projecting from the elongated holes 17 of the lower drum 4 are required. Flexible wiring board 1
The 6 slit holes 21 are fitted. At this time, dimensions H,
Even if the relationship of T is H <T, by setting the dimensional difference as small as, for example, several μm to several tens μm, the slit portion 21 is formed in the protruding portion 18 by deformation (bending or the like) of the flexible wiring board 16 itself. Can be fitted.

By fitting the slit holes 21 of the flexible wiring board 16 into the projecting portions 18 of the motor stator 14 in this manner, the upper edge and the lower edge of the slit holes 21 respectively contact the front and back surfaces of the projecting portions 18. It will be in the state of having done. The contact state between the two is obtained over the entire length of the slit hole 21 in the longitudinal direction. As a result, as shown in FIG.
A gap is not formed between the slit hole 21 and the vertical direction of the drum. Therefore, the land portion 1 of the motor stator 14
When the solder 23 is supplied to the lands 9 of the flexible wiring board 16 corresponding to the solder 9, the flow of the solder 23 into the drum can be reliably prevented.

By the way, in the experiment by the present inventors, the thickness of the motor stator 14 including the protrusion 18 in FIG. 4A and FIG.
8 is set to W1 = 7.2 mm, the short dimension of the slit hole 21 of the flexible wiring board 16 is set to H = 0.4 mm, and the same width W2 = 7.5 mm.
It was confirmed that the fitting between the groove and the slit hole 21 was performed without any problem, and that the flow of solder into the drum could be reliably prevented.

The thickness T of the protrusion 18 and the short dimension H of the slit 21 have some tolerance in manufacturing (working) the motor stator 14 and the flexible wiring board 16. Therefore, the relationship between the thickness dimension T of the projection 18 and the short dimension H of the slit hole 21 is set to H <T, and when the thickness dimension T of the projection 18 is near the maximum value of the allowable error range, If the short dimension H is close to the minimum value of the allowable error range, there is a concern that the fitting between the two becomes tight and the assemblability is deteriorated.

As a countermeasure against such a case, it is effective means to form a cut portion at the opening edge of the slit hole 21 of the flexible wiring board 16. Specifically, as shown in FIG. 6, at the opening edge of the slit hole 21, the cut portions 24 are formed at the upper edge and the lower edge of the slit hole 21 so as to be located on both sides of each land 22. It is desirable that the width of the cut portion 24 be set as small as possible. Further, it is desirable that the depth of the cut portion 24 is appropriately set within a range where the degree of freedom of movement of the land portion 22 can be obtained without excess or deficiency.

By forming the cuts 24 at the opening edges of the slit holes 21 in this manner, each land 22 can have a degree of freedom of movement between the cuts 24 adjacent to each other. Therefore, as described above, the thickness dimension T of the protruding portion 18 and the short dimension H of the slit hole 21 are determined.
Is set to be H <T, the thickness dimension T of the protruding portion 18 is near the maximum value of the allowable error range, and the short dimension H of the slit hole 21 is near the minimum value of the allowable error range. The slit holes 21 can be smoothly fitted into the protruding portions 14 by a minute movement of each land portion 22 between the cut portions 24. Further, between the notches 24 adjacent to each other, the protrusion 14 and the slit hole 21 are formed.
Since there is no gap in the upper and lower directions of the drum, the flow of solder into the drum can be effectively prevented.

In forming the cut portion at the opening edge of the slit hole 21, it is also possible to adopt a form as shown in FIG. That is, the upper edge and the lower edge of the slit hole 21 are formed linearly, and the cut portions 25 are formed at both ends (non-land forming portions). The notch 25 is located on the center axis of the slit hole 21,
Further, it is desirable to form the slit along the longitudinal direction of the slit hole 21. Further, it is desirable that the depth of the cut portion 25 is appropriately set within a range where the degree of freedom of movement of a land forming portion described later can be obtained without excess or deficiency.

By forming the cut 25 at the opening edge of the slit hole 21 in this manner, the cut 2
The one (upper) land forming portion and the other (lower) land forming portion with the boundary of 5 can each have a degree of freedom of movement. Therefore, as described above, the protrusion 18
The relationship between the thickness T of the sheet and the short dimension H of the slit hole 21 is H
<T, the thickness dimension T of the projection 18 is near the maximum value of the allowable error range, and the short dimension H of the slit hole 21 is near the minimum value of the allowable error range. The slit hole 21 can be smoothly fitted into the protruding portion 14 by a minute movement of one land forming portion and the other land forming portion at the boundary. Also,
Since there is no gap between the protrusion 14 and the slit hole 21 in the vertical direction of the drum, it is possible to effectively prevent the solder from flowing into the drum.

Further, in the one shown in FIG. 6, the slit holes 21 in which a plurality (four in the illustrated example) of land portions 22 are arranged are arranged.
Although there is a slight gap 24 between the upper edge and the lower edge of the slit hole 21, no gap is formed between the upper edge and the lower edge of the slit hole 21 in FIG. After smooth fitting of the protrusion 14 and the slit hole 21, it is possible to more reliably prevent the solder from flowing into the drum.

In the above-described embodiment, the rotary drum device having a three-layer drum structure including the rotary drum 2, the upper drum 3, and the lower drum 4 has been exemplified. However, the present invention is not limited to this, and the rotary drum and the fixed drum may be used. The present invention is also applicable to a two-layer drum having a lower drum.

Further, in the above embodiment, the motor stator 14 in which the plurality of lands 19 are formed on the front and back surfaces of the protruding portion 18 is exemplified. The structure in which the land portion 19 is formed is also applicable.

[0035]

As described above, according to the present invention, by setting the short dimension of the slit hole of the flexible wiring board to be equal to or less than the thickness dimension of the projecting portion of the motor stator,
When a slit hole is fitted to the protrusion, no gap is formed between the two in the vertical direction of the drum. For this reason, it is possible to reliably prevent the solder from flowing into the drum without adding a solder inflow prevention component. As a result, it is possible to eliminate various problems (such as a rotational operation failure of the drum) due to the flow of the solder into the drum without increasing the cost and size of the device due to the increase in the number of components.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a configuration of a rotary drum device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing an arrangement state of components according to the embodiment of the present invention.

FIG. 3 is a perspective view showing a connection state between a motor stator and a flexible wiring board according to the embodiment of the present invention.

FIG. 4 is a diagram illustrating a dimensional relationship between a motor stator and a flexible wiring board according to the embodiment of the present invention.

FIG. 5 is a side sectional view showing a connection state between a motor stator and a flexible wiring board according to the embodiment of the present invention.

FIG. 6 is a structural explanatory view (part 1) of a flexible wiring board according to another embodiment of the present invention.

FIG. 7 is a diagram (part 2) illustrating the structure of a flexible wiring board according to another embodiment of the present invention.

FIG. 8 is a perspective view showing a conventional arrangement state of components.

FIG. 9 is a side sectional view showing a conventional connection state between a motor stator and a flexible wiring board.

[Explanation of symbols]

1 rotary drum device, 2 rotary drum, 3 upper drum,
4 Lower drum, 14 Motor stator, 16 Flexible wiring board, 17 Slot, 18 Projection, 19, 22
Land part, 21: slit hole, 23: solder, 24, 2
5 ... notch

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Satoshi Uemura Sakazaki, Koda-cho, Nada-gun, Aichi Prefecture, 1st place within the park, Sony Koda Co., Ltd. No. 1 at Suzugairi Sony Koda Co., Ltd. (72) Shinichi Hasegawa 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo Sonny Co., Ltd. 7-35 Chome Sony Corporation F-term (reference) 5D036 AA17 CC04 CC43 CC51 CC95

Claims (3)

[Claims] 1. A motor stator integrally having a projection formed with a plurality of lands, a slit hole capable of being fitted to the projection and the slit hole corresponding to the land on the motor stator side. A plurality of lands formed in the vicinity of the motor, and a flexible wiring board for driving the motor, which is soldered to the motor stator using the lands, A short drum dimension is set to be equal to or less than a thickness dimension of the protruding portion. 2. The rotary drum device according to claim 1, wherein a cut portion is formed at an opening edge of the slit hole of the flexible wiring board. 3. A motor stator integrally having a projection formed with a plurality of lands, a slit hole fittable with the projection, and the slit hole corresponding to the land on the motor stator side. A plurality of lands formed in the vicinity of the motor, and a flexible wiring board for driving the motor, which is soldered to the motor stator using the lands, A magnetic recording / reproducing apparatus using a rotary drum device having a short dimension set to be equal to or less than a thickness dimension of the protrusion.