JP3492387B2 - Flexible printed circuit board of spindle motor for driving magneto-optical disk of information recording / reproducing 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 flexible printed circuit board of a spindle motor for driving a magneto-optical disk of an information recording / reproducing apparatus.

[0002]

2. Description of the Related Art A control drive board of a spindle motor for rotationally driving a magneto-optical disk of an information recording / reproducing apparatus using a magneto-optical disk is provided with a spindle motor as disclosed in Japanese Patent Laid-Open No. 1996-199631. Many were formed integrally. However, recently, with the progress of miniaturization of the information recording / reproducing apparatus, other parts are often mounted in the vicinity of the spindle motor, and the spindle motor control drive board is configured separately from the spindle motor, and It has become more common to be electrically connected via a connector.

Further, in the information recording / reproducing apparatus disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 2-199631, the rotor of the spindle motor and the turntable are constructed separately, but in the present situation, for example, Japanese Patent Application Laid-Open No. As disclosed in Japanese Unexamined Patent Publication No. 64-67760, it is common knowledge to integrally form a rotor of a spindle motor and a turntable to make the spindle motor thinner.

However, in the spindle motor having such a structure, when the spindle motor and the control drive board are integrally formed, the board needs to be arranged so as to face the rotor due to the structure of the spindle motor. It will be arranged in the space in the device where the motor is arranged. However, in the information recording / reproducing apparatus, particularly in the optical disk drive apparatus, the internal space of the apparatus where the optical system exists is kept closed or close to it in order to prevent the entry of dust. Since it is driven by a large current, the driver IC on the substrate generates heat, which is a problem. For this reason, the control drive board of the spindle motor is often configured separately from the spindle motor and arranged in the space outside the apparatus.

FIG. 5 shows an example of the arrangement of the spindle motor and the control drive board of the information recording / reproducing apparatus having such a structure. In FIG. 5, a flexible printed circuit (Flexible Print Circuit) on which a stationary part such as a stator coil of the spindle motor 1 and a Hall element for detecting a rotational position is mounted.
The board (hereinafter abbreviated as FPC) 2 has a cable portion 2b that extends from the mounting portion 2a facing the rotor portion 3 of the spindle motor 1 on the same plane and has a connector for connecting to the control drive board 8 at its tip. Has been formed.

A filter 5 and a seal member 6 are attached to a chassis 4 on which the spindle motor 1 is installed, and a loading portion 7 for a magneto-optical disk is mounted on the chassis 4 so as to be almost sealed from the outside and to prevent dust and the like. Intrusion is prevented. The cable portion 2b extending from the mounting portion 2a of the FPC 2 passes through the cutout portion 4a provided between the chassis 4 and the filter 5 and exits to the external space of the device, and the spindle installed on the back surface of the chassis 4 Motor control drive board 8
Connected via a connector.

However, this configuration has the following problems. The first problem is that it is unavoidable to provide the cutout portion 4a in order to bring the cable portion 2b of the FPC 2 from the internal space of the apparatus to the external space, but dust or the like enters from this portion and adheres to the optical system or the like. , And has an adverse effect on the recording and reproduction of information.

The second problem is that the cable portion 2 of the FPC 2 is
In the space between the chassis 4 and the loading section 7 in the space outside the apparatus where b is disposed, a switch for detecting a cartridge of a normal disc, a loading motor serving as a drive source for inserting and ejecting the cartridge, and the like are disposed. Therefore, if the cable portion 2b is arranged in this portion, it will be an obstacle to the arrangement of these parts.

To solve these problems, the FPC is electrically connected to the control drive board 8 provided in the external space of the apparatus,
Moreover, as a method of sealing the internal space of the apparatus, as shown in FIG. 6, the connector 9 of the control drive board 8 provided on the back surface of the chassis 4 is exposed to the hole 4b provided in the chassis 4, and the connector 9 of the FPC 2 is attached. A structure in which a connector 9'at the tip of the cable portion 2b is coupled and the hole 4b is closed by the control drive board 8 is considered.

Although not shown in FIGS. 5 and 6, a head for recording and reproducing information on the disk around the spindle motor 1 and a head for moving the head in the radial direction of the disk. The guide rails, the FPC for electrically connecting the head and the circuit board, and the like are arranged. Therefore, the cable portion 2b of the FPC 2 for the spindle motor 1 and the connector 9 of the control drive board 8 are these components. Must be placed so that it does not interfere with. Therefore, in FIG. 6, the connector 9 is provided in the vicinity of the base portion 1a of the spindle motor 1 so that the cable portion 2b and the connector 9 can be accommodated in the space allowed for the FPC 2 in the apparatus internal space in FIG. Further, in connection with the connector 9, the cable portion 2b needs to have a certain degree of slack and needs to be long, and is bent upward at a substantially right angle in the vicinity of the portion of the spindle motor 1 extending from the rotor portion 3. At the same time, the connector 9'is further folded back at an angle of about 180 °, and the connector 9'is inserted and coupled to the mating connector 9.

With such a configuration, the bending and folding back of the cable portion 2b of the FPC 2 is performed almost by hand, and since the FPC 2 is flexible, the bending and folding angles are highly accurate. It is difficult to manage, and due to this variation in bending and folding angle, FP
There is a great risk that the standing surface, which is bent and rises above C2, tilts and comes into contact with the rotor portion 3 of the spindle motor 1 that faces the standing surface.

In order to prevent this, it is conceivable to provide some kind of guide member at the bent portion of the FPC 2, but this has the drawback of increasing the cost.

[0013]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems in disposing the FPC of the conventional spindle motor.
Even when a connector for connecting the FPC cable part to the spindle motor control drive board provided on the back surface of the chassis is provided on the chassis surface near the spindle motor, the standing surface of the FPC cable part contacts the rotor part of the spindle motor. An object of the present invention is to provide an FPC for a spindle motor that does not cause

[0014]

The FPC according to the present invention comprises:
In order to solve the above-mentioned problems, the cable portion extending from the mounting portion of the FPC is bent in a substantially right-angled direction with a straight line extending radially from the rotation center of the spindle motor in the vicinity of the spindle motor as a fold line, thereby rotating the spindle motor. It is characterized in that a first erected surface is formed which extends in a range not interfering with the rotor portion of the spindle motor in a plane including the shaft.

When the spindle motor control drive board is arranged below the FPC, the first standing surface is folded back by approximately 180 ° at the upper end. The height of the first standing surface has a width necessary for disposing a cable electrically connecting the spindle motor and its control drive circuit, and the edge of the first standing surface facing the spindle motor. From the edge on the opposite side, it is preferable to extend to the spindle motor control drive board after being bent at an appropriate number of times with a straight line parallel to the rotation center of the spindle motor as a fold line. An edge of the first standing surface facing the spindle motor is configured to draw an arc having a curvature radius of a width required for disposing a cable electrically connecting the spindle motor and a control drive circuit thereof. May be. A cable extending to the side opposite to the edge of the first standing surface facing the spindle motor is bent by about 180 ° to form a second standing surface, and a spindle motor control is provided at the lower end edge of the second standing surface. It is also convenient to provide a connector for connection to the drive board.

[0016]

In the FPC of the present invention, as described above, the first standing surface of the FPC is formed so as to extend within the plane including the rotation axis of the spindle motor so as not to interfere with the rotor portion of the spindle motor. Even if the angle of the first standing surface with respect to the chassis surface varies due to the variation in angle, the edge of the first standing surface facing the rotor portion of the spindle motor may be separated from the rotor portion, but there is no risk of interference.

[0017]

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a diagram showing a first embodiment of the present invention. In the figure, a cable 2b extending from the mounting portion 2a of the FPC 2 facing the rotor portion 3 of the spindle motor 1
Is bent so that a straight line B passing through the axis 0 of the spindle motor 1 and extending in the radial direction is a fold line, and is bent upward at a substantially right angle to form a first standing surface 2c. First
An end edge of the standing surface 2c on the spindle motor 1 side faces the outer peripheral surface of the rotor portion 3 of the spindle motor 1 with a slight gap. The first standing surface 2c is approximately 180 at the upper end.
° Folded back, and the chassis 4
In the hole 4b provided in the connector, a connector 9'that is inserted and coupled to the connector 9 of the control drive circuit board 8 provided on the back side of the chassis is provided so as to cover the hole 4b.

With this configuration, the FPC2
Even if the bending angle of the first standing surface 2c provided on the cable 2b varies, the distance between the edge of the first standing surface 2c on the spindle motor side and the outer peripheral surface of the rotor portion 3 of the spindle motor is small. (Because the edge is raised as one end of the standing surface with a slight distance from the outer peripheral surface of the rotor portion), they do not interfere with each other. Also, the first standing surface 2c
Sufficient slack is obtained at the trailing edge and the trailing edge, so that the connectors 9 and 9'can be joined together without difficulty.

FIG. 2 is a diagram showing a second embodiment of the present invention. In this embodiment, as in the example of FIG. 1, the cable 2b of the FPC 2 is formed with a first vertical line formed by bending a straight line B in the radial direction passing through the rotation center of the spindle motor at a fold line at an angle of approximately 90 °. Although the installation surface 2c is provided, in this example, it is not folded downward by 180 ° at the upper end, and is extended substantially in the radial direction from the edge of the first standing installation surface 2c on the opposite side of the spindle motor 1. The control drive board 8 provided on the rear surface of the chassis 4 is bent at an appropriate number of times and at an appropriate angle in an arbitrary plurality of planes perpendicular to the surface of the chassis so as to match the position of the connector 9. A connector 9 ′ is provided at a lower end of the control drive circuit board 8 so as to extend slightly downward just above and connected to the connector 9 of the control drive circuit board 8. In this case, the first standing surface 2c and the portion of the cable 2b following the first standing surface 2c
The width in the height direction of the control drive unit 8 and the spindle motor 1
The width H is necessary for the arrangement of a cable for electrically connecting and.

With this configuration, when the space for providing the connector 9 cannot be provided near the spindle motor 1, the FPC 2 can be provided up to the connector provided at an arbitrary position.
The cable portion 2b can be extended, and the cable portion 2b is always a plane parallel to the axis 0 of the spindle motor 1, so that the ratio of the cable portion 2b to the chassis surface can be minimized. Wiring can be performed by utilizing a space such as a gap between other components, space efficiency is improved, and the device can be downsized.

In the embodiment shown in FIG. 3, the upper edge of the first standing surface 2c of the FPC 2 on the side facing the spindle motor is
It is formed so as to draw an arc 2d having a radius of curvature of H described above. With this configuration, not only is there no hindrance to the arrangement of the connection cable, but also the position of the bending line and the bending angle of the FPC 2 vary, and the mounting height of the connector 9 also varies, so Even if the first standing surface 2c has an error, the FPC 2 is more difficult to contact the rotor portion 3 of the spindle motor 1.

In the fourth embodiment shown in FIG. 4, the upper end edge of the first standing surface 2c on the spindle motor side is formed in an arc shape having a radius of curvature of H as in the third embodiment. A second standing surface 2d is formed by being folded back at an angle of about 180 ° at an extension portion opposite to the spindle motor. The lower end thereof is extended slightly downward, a connector 9'is provided on the lower end, and is connected to the connector 9 of the control drive board 8 provided on the back side of the chassis 4.

With such a configuration, the connector 9 can be located at the desired position, that is, the cable end portion can be set to an arbitrary length, but the cable cannot be sufficiently extended and arranged, and the connector 9 can be placed near the spindle motor 1. Even if it can only be taken, the connector 9 ′ at the tip of the FPC 2 can be easily inserted and connected to the connector 9 of the control drive board 8.

[0024]

As described above, according to the present invention, when electrically connecting the flexible printed circuit board to the spindle motor control drive board, the cable portion of the FPC is combined with the spindle motor control drive board provided on the back surface of the chassis. Even when the connector is provided on the chassis surface near the spindle motor, there is no possibility that the standing surface of the cable portion of the FPC will come into contact with the rotor portion of the spindle motor.
This is effective in improving reliability and downsizing the device.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing another embodiment of the present invention.

FIG. 3 is a perspective view showing still another embodiment of the present invention.

FIG. 4 is a perspective view showing still another embodiment of the present invention.

FIG. 5 is a perspective view showing an example of a flexible substrate for a spindle motor for driving a magneto-optical disk of a conventional information recording / reproducing apparatus.

FIG. 6 is a perspective view showing another example of a conventional flexible substrate.

[Explanation of symbols]

1 Spindle motor 2 Flexible printed circuit board (FPC) 2a Mounting part 2b Cable part 2c First standing surface 2d Second standing surface 3 rotor 4 chassis 8 Spindle motor control drive board 9,9 'connector

Claims (4)

(57) [Claims] 1. A mounting part on which a stator coil and a rotational position detecting element of a spindle motor for driving a magneto-optical disk of an information recording / reproducing apparatus are mounted, and a cable electrically connecting the mounting part and a spindle motor control drive board. In a flexible printed circuit board having a cable portion provided with and a connector formed at the tip of the cable portion for connection with the spindle motor control drive substrate, the cable portion extending from the mounting portion of the flexible printed circuit board is By being bent at a substantially right angle with a straight line extending in the radial direction from the center of rotation of the spindle motor in the vicinity of the spindle motor as a fold line, it extends to a range that does not interfere with the rotor portion of the spindle motor within a plane including the rotation axis of the spindle motor. Flexible print characterized by having an upright surface Plate. 2. The spindle motor of the first upright surface, wherein the height of the first upright surface has a width necessary for disposing a cable electrically connecting the spindle motor and its control drive circuit. From the edge on the opposite side of the edge facing to, the straight line parallel to the rotation center of the spindle motor is folded at any number of times,
The flexible printed board according to claim 1, wherein the flexible printed board extends to the spindle motor control drive board after being bent at an appropriate angle. 3. An edge of the first erected surface facing the spindle motor draws a circular arc having a radius of curvature required for disposing a cable electrically connecting the spindle motor and its control drive circuit. The flexible printed circuit board according to claim 2, wherein the flexible printed circuit board is configured as described above. 4. A cable extending to the opposite side of an edge of the first erected surface facing the spindle motor is bent by about 180 ° to form a second erected surface, and a lower end edge of the second erected surface is formed. The flexible printed circuit board according to claim 2 or 3, wherein the connector is provided in the.