JPH058766U - Hard disk device head retract mechanism - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a head retracting mechanism of a hard disk device, and an object of the present invention is to realize a head retracting mechanism of a hard disk device which can reduce the size and cost of the hard disk device. [Structure] A head carriage 2, a flexible printed circuit board 6 made of an elastic body, and a pressing member 7 are pressed when the magnetic head 3 is on the data area 1a of the hard disk 1 when the hard disk device body 10 is powered off. The elastic restoring force of the flexible printed circuit board 6 curved by the member 7 rotates the head carriage 2 via the pressing member 7 to retract the magnetic head 3 onto the landing zone 1b of the hard disk 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a head retracting mechanism of a hard disk device, and more particularly to a head retracting mechanism of a hard disk device that retracts a magnetic head onto a landing zone of the hard disk when the power source of the hard disk device main body is turned off.

[0002]

[Prior Art]

 FIG. 6 shows a head carriage mechanism of a hard disk device to which a head retracting mechanism of a conventional hard disk device is applied.

In FIG. 6, 1 is a hard disk, 1a on the outer peripheral side is a data area, and 1b on the inner peripheral side is a landing zone. Reference numeral 2 denotes a head carriage, and upper and lower magnetic heads 3a and 3b (however, the lower magnetic head 3b is not shown) are fixed to the tip end thereof, and a drive coil 4 is attached to the base end thereof. A rotary shaft 5 rotatably holds the hard disk device body 10.

In the head carriage mechanism of the hard disk device configured as described above, the magnetic head 3 is still rotated after the power is turned off in order to prevent the magnetic head 3 from dropping onto the data area 1a of the hard disk 1 when the power of the hard disk device main body is turned off. Continuing to use the inertial force of the hard disk 1 to generate an electromotive force, and the electromotive force drives the head carriage 2 to move the magnetic head 3 to the landing zone 1b of the hard disk. The mechanism is known.

[0005]

[Problems to be solved by the device]

 However, in the head retracting mechanism of the conventional hard disk drive having the above-mentioned configuration, an electromotive force is generated from the inertial force of the hard disk 1 and the electromotive force causes the magnetic head 3 to move to the landing zone 1b of the hard disk. An electric circuit for driving the drive 2 is required, and the price and space required for the circuit configuration are factors that hinder the cost reduction and downsizing of the hard disk drive. The present invention has been made in view of the above problems, and an object of the present invention is to provide a head retracting mechanism for a hard disk drive that is inexpensive and does not require space for that purpose.

[0006]

[Means for Solving the Problems]

 The present invention provides a head carriage that has a magnetic head and is rotatably supported by a hard disk device body, one end of which is fixed to the head carriage and the other end of which is fixed to the hard disk device body. The magnetic head is located on the data area of the hard disk, which is provided on either or both of the flexible printed circuit board that electrically connects the main body and the fixed part at one end and the other end of the flexible printed circuit board. In this state, the flexible printed circuit board is composed of a pressing member that bends against the elastic force, and the flexible printed circuit board causes the magnetic head to move to the landing zone of the hard disk due to elastic restoring force when the hard disk device body is powered off. Move the above head key to move it up. It is substantially moved to constitute a ridge.

[0007]

[Action]

 In the present invention, there is provided a pressing member for bending the flexible printed circuit board, which is intended to electrically connect the head carriage and the hard disk drive, against the elastic force while the magnetic head is on the data area of the hard disk. By doing so, the magnetic head can be moved to the landing zone of the hard disk due to the elastic restoring force of the flexible printed circuit board when the power supply of the hard disk device main body is turned off. Further, it is possible to increase the distance between the rotation axis of the head carriage and the point where the turning force by the elastic restoring force of the flexible printed board acts.

[0008]

FIG. 1 shows a head carriage mechanism to which a head retracting mechanism of a hard disk drive according to an embodiment of the present invention is applied.

In FIG. 1, the head retracting mechanism is composed of a head carriage 2, a flexible print substrate 6, and a pressing member 7.

The same components as those of the conventional head carriage mechanism shown in FIG. 6 are designated by the same reference numerals, and the description thereof is partially omitted.

Upper and lower magnetic heads 3 a and 3 b are fixed to the tip of the head carriage 2, and the hard disk 1 is sandwiched between the magnetic heads 3 a and 3 b. The head carriage 2 is rotatably supported by the main body 10 of the hard disk drive about a rotary shaft 5, and the magnetic heads 3a and 3b are rotated by the head carriage 2 to move the magnetic heads 3a and 3b to the data area 1a on the hard disk 1. It is possible to move from the outer periphery to the landing zone 1b. A drive coil 4 is attached to the base end portion of the head carriage 2, and a drive current is passed from the hard disk device body 10 to the drive coil 4 via the flexible print substrate 6 to form a magnetic flux. Then, the head carriage 2 is driven by the interaction with the magnetic flux formed by the magnet 8 fixed to the main body 10 of the hard disk device.

FIG. 3 shows a state before the flexible printed board 6 is attached.

The flexible printed circuit board 6 is made of an elastic material, and generally has one end 6 a fixed to the head carriage 2, the other end 6 b fixed to the hard disk device body 10, the head carriage 2 and the hard disk device body 10. It is composed of a bridging portion 6c bridging between the two.

Further, of the one end portion 6a, a portion on the extension line of the bridging portion 2c is the one end side fixing portion 6e, the portion expanded to the upper part of FIG. The portion extended from is referred to as a coil connecting portion 6f. Further, of the other end side 6b, the part on the extension line of the bridging part 6c is the other end side fixing part 6h, the part expanded to the upper part is the circuit part 6g, and the part further extended to the lower right side of the circuit part 6g. Is referred to as a board connecting portion 6k.

FIG. 4 is a plan view (A) and a side view (B) showing the pressing member 7.

The pressing member 7 is, for example, a sheet metal molded product, and has a substantially rectangular shape. Further, a screw hole 7a is provided near the left end in FIG. 4, and the right end is slightly bent to form a substrate protecting part 7b.

FIG. 5 is a perspective view showing an extended state of the flexible printed circuit board 6 of FIG.

In FIG. 5, 9a and 9b are substrate holding plates, which are attached to the upper left portion of the hard disk device body 10 in FIG. 1, 9a is attached to the hard disk device body 10 horizontally, and 9b is attached vertically. In the flexible printed circuit board 6, the circuit portion 6g of the other end portion 6 is fixed to the substrate holding portion 9a by bending the other end side fixing portion 6h and the circuit portion 6g at a right angle. The board connecting portion 6k extends from the board holding plate 9a.

Further, at one end portion 6a of the flexible printed circuit board 6, a head connecting portion 6d is fixed around the rotating shaft 5 on the upper surface of the head carriage 2, and one end fixing portion 6e is arranged between the head connecting portion 6d and the head connecting portion 6d. Is bent at a right angle and is fixed to the side surface of the head carriage 2 near the rotary shaft 5 by a screw 11 together with the pressing member 7, and the coil connecting portion 6f is fixed to the rear of the head carriage 2.

The pressing member 7 is fixed to the head carriage 2 together with the flexible printed circuit board 6, and then bent outward by about 30 degrees at the bending portion 7c.

In this manner, the other end 6 b of the flexible printed circuit board 6 is fixed to the hard disk device main body 10 via the substrate holding portion 9, and the one end 6 a is fixed to the head carriage 2 while the flexible printed circuit board 6 is fixed. The bridging portion 6c of the above is a state in which it is curved inward between both fixing portions against the elastic force of the flexible printed board 6 made of an elastic body as described above (hereinafter, referred to as “first "Curvature".).

In the flexible printed circuit board 6 having the above structure, the board connecting portion 6k of the other end portion 6b is connected to the board of the hard disk device body 10, and the circuit portion 6g is an amplifier of the head.

Next, the operation of the head retracting mechanism of the hard disk device having the above configuration will be described.

1 and 5 show a state in which the magnetic head 3 is on the data area 1a of the hard disk 1, that is, a state in which data on the hard disk 1 is read and written by the magnetic head 3. The bridging portion 6c of the flexible printed circuit board 6 in this state is pressed by the base plate protecting portion 7b of the pressing member 7 which is further bent outward in addition to the above-described first curvature between both fixing portions. It is in a state of being curved in a direction opposite to the curve of No. 1 (hereinafter referred to as "second curve").

The flexible printed circuit board 6 in this state presses the pressing member 7 in an attempt to restore the above two curved portions by its elastic restoring force. Of this pressing force, the elastic restoring force for the first curve acts as a force for pressing the rotary shaft 5 of the head carriage 2 in the lower right direction in FIG. 1, and the elastic restoring force for the second curve is the head carriage. 2 acts to rotate counterclockwise.

During reading and writing of data on the hard disk 1 by the magnetic head 3, a drive current is passed through the flexible printed circuit board 6 to the drive coil 4, and the magnetic flux formed in the drive coil 4 is generated by this drive current. By the interaction between the magnet 8 and the magnet 8, the head carriage 2 is controlled so as to guide the magnetic head 3 to a predetermined track on the hard disk 1 against the turning force due to the elastic restoring force of the flexible printed circuit board 6 described above. There is.

Next, when the power source of the hard disk device body 10 is turned off, the supply of the drive current to the drive coil 4 is cut off, and the drive force of the drive coil 4 for the head carriage 2 disappears. Therefore, the head carriage 2 is rotated counterclockwise by the turning force for the head carriage 2 due to the elastic restoring force of the flexible printed board 6 described above, and the state shown in FIG. 2 is obtained.

In the state of FIG. 2, the above-mentioned second curve has already been eliminated. Therefore, in this state, there is rotational force for the head carriage 2 due to the elastic restoring force of the flexible printed circuit board 6. do not do. In this state, the magnetic head 3 is retracted onto the landing zone 1b of the hard disk 1. Further, in this state, the magnet 12 provided near the upper end of the magnet 8 of the main body 10 of the hard disk device holds the drive coil 4 at the base end of the head carriage 2 in FIG. The upper end is attracted and the head carriage 2 is held by the hard disk drive main body 10 via the magnet 12.

As described above, according to this embodiment, in addition to the function of transmitting a signal between the hard disk drive main body 10 and the head carriage 2 which is the original function of the flexible printed circuit board 6, the magnetic head is cut off when the power is turned off. Since the flexible printed circuit board 6 is provided with the function of retracting the hard disk drive 3 to the landing zone 1b of the hard disk 1, it is possible to eliminate the other structure for driving the head carriage 2 when the power is turned off.

Further, since the distance between the rotary shaft 5 of the head carriage 2 and the point where the rotational force of the flexible printed circuit board 6 acts can be lengthened, the flexible printed circuit board 6 can be utilized by utilizing the lever principle. The elastic restoring force can be effectively used as the force for rotating the head carriage 2.

Further, by adjusting the attachment point of the flexible printed circuit board 6 to the head carriage 2 and the bending angle of the bent portion 7c of the pressing member 7, the rotational force of the head carriage 2 due to the elastic restoring force of the flexible printed circuit board 6 is adjusted. It can be adjusted.

Although the pressing member 7 is attached to the head carriage 2 side of the flexible printed circuit board 6 in the present embodiment, the pressing member is not limited to the above-described structure, and the pressing member is not limited to the hard disk device body 10 of the flexible printed circuit board 6. The same effect may be obtained by mounting the pressing member on both the head carriage 2 side and the hard disk device body 10 side of the flexible printed circuit board 6 so as to obtain the same effect. You can

[0033]

[Effect of the device]

 As described above, according to the present invention, the function of retracting the magnetic head to the landing zone of the hard disk when the power is turned off is provided to the flexible printed circuit board. Therefore, the structure for driving the head carriage when the power is turned off is provided. It can be eliminated, and the hard disk drive can be downsized and the price can be reduced. In addition, since the distance between the rotation axis of the head carriage and the point where the rotation force of the flexible printed circuit board acts can be lengthened, the elastic restoring force of the flexible printed circuit board can be used as the force for rotating the head carriage. It can be used effectively.

[Brief description of drawings]

FIG. 1 is a plan view of a head carriage driving mechanism to which a head retracting mechanism of a hard disk device according to an embodiment of the present invention is applied.

FIG. 2 is a diagram showing a state in which the magnetic head of FIG. 1 is retracted onto a landing zone.

FIG. 3 is a view showing a flexible printed circuit board of a main part of an embodiment of the present invention.

FIG. 4 is a view showing a pressing member of an essential part of an embodiment of the present invention.

FIG. 5 is a perspective view of an embodiment of the present invention.

FIG. 6 is a plan view of a head carriage drive mechanism to which a head retracting mechanism of a conventional hard disk device is applied.

[Explanation of symbols]

 1 Hard Disk 1a Data Area 1b Landing Zone 2 Head Carriage 3 Magnetic Head 4 Driving Coil 5 Rotating Shaft 6 Flexible Printed Circuit Board 7 Pressing Member 8, 12 Magnet 9 Board Holding Plate 10 Hard Disk Drive Main Body

Claims (1)

Claims for utility model registration: 1. A head carriage having a magnetic head and rotatably supported by a hard disk drive main body; one end fixed to the head carriage and the other end fixed to the hard disk drive main body. The flexible printed circuit board for electrically connecting the head carriage and the main body of the hard disk device, and one or both of the fixed portions at one end and the other end of the flexible printed circuit board are provided, and the magnetic head is provided in the hard disk. Of the data area, the flexible printed circuit board includes a pressing member that bends the flexible printed circuit board against the elastic force. The head so that it moves over the landing zone of the hard disk Head retraction mechanism of a hard disk device substantially moved to configure Yarijji.