JP2584160Y2 - Head carriage mechanism - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head carriage mechanism, and more particularly to a head carriage mechanism which moves a magnetic head in the radial direction of a magnetic disk while sliding the magnetic head on the magnetic disk.

[0002]

2. Description of the Related Art Conventional head carriage mechanisms include:
For example, there is a configuration shown in FIG. In the figure, a head carriage mechanism 1 has a lower magnetic head 3 supported near a tip of a carriage base 2 and an upper magnetic head 5 supported near a tip of a head arm 4. Is moved in the radial direction of the magnetic disk while sliding on the magnetic disk (not shown). The head arm 4 has a leaf spring 6 connected to the rear end fixed to the head arm mounting portion 2a of the carriage base 2 by screws 7, and is supported rotatably by bending the leaf spring 6.

A holding member 9 for holding a torsion spring 8 is fixed to the head arm mounting portion 2a of the carriage base 2 by screws 7 on the upper surface of the head arm mounting portion 2a of the carriage base 2. The spring 6 is sandwiched between the holding member 9 and the upper surface of the head arm mounting portion 2a.

The torsion spring 8 has a coil portion held by a holding portion 9a of a holding member 9, one end 8a of which is locked by a locking portion (not shown in FIG. 9) of the holding member 9, and a second end. 8b is a pressure receiving portion 4a provided on the upper surface of the head arm 4.
In the groove. Accordingly, the head arm 4 is pressed in the Y direction by the pressing force of the torsion spring 8, and the upper magnetic head 5 is rotated and urged clockwise close to the lower magnetic head 3.

[0005]

However, in the above-described conventional head carriage mechanism, the torsion spring 8 is held by the holding portion 9a of the holding member 9 provided above the head arm 4. The height dimension of the head carriage mechanism is determined by the mounting position. Therefore, conventionally, the height dimension of the head carriage mechanism is increased by the provision of the torsion spring 8 above the head arm 4, which hinders a reduction in the thickness of the magnetic disk drive.

Therefore, an object of the present invention is to provide a head carriage mechanism that solves the above-mentioned problems.

[0007]

According to the present invention, a first tip is provided.
And a carriage base having a head arm mounting portion formed near the base, and a second magnetic head supported near the free end facing the first magnetic head. In a head carriage mechanism having a head arm rotatably supported by a head arm mounting portion, and a torsion spring for urging the head arm so that the second magnetic head approaches the first magnetic head. The torsion spring is held along the side surface of the head arm, and is formed so as to contact the upper surface from the side surface of the head arm and press the tip end of the head arm.

[0008]

The torsion spring is held along the side surface of the head arm and comes into contact with the upper surface from the side surface of the head arm, so that there is no need to secure a space for providing the torsion spring above the head arm. The height can be reduced.

[0009]

1 to 5 show a first embodiment of a head carriage mechanism according to the present invention. 1 to 5, the same parts as those in FIG. 10 described above are denoted by the same reference numerals, and the description thereof will be omitted.

In each figure, a head carriage mechanism 11 has a spring locking groove 13 on an upper surface 12a of a head arm 12.
The spring locking groove 13 is formed so as to extend in the X direction orthogonal to the longitudinal direction of the head arm 12. The spring contact groove 14 is located at an intermediate position of the spring locking groove 13 in the X direction.
Is protruding.

On both side surfaces of the holding member 15, cylindrical spring holding portions 15a and 15b protrude, and extend in the lateral direction, respectively. The spring holding portions 15a, 1 are provided on both sides of the head arm mounting portion 16a of the carriage base 16.
Spring hooks 16b, 16 extending in the same direction below 5b
c is protruding.

As shown in FIG. 6, the torsion spring 17
The first coil part 17a fitted and held in the spring holding part 15a, the second coil part 17b fitted and held in the spring holding part 15b, and the first coil part 17a 2
And a catching portion (first catching portion) 17c formed in a U-shape and connected to the coil portion 17b. One end (second hook) 17d of the first coil portion 17a is connected to the hook 17
It extends in the direction opposite to the direction c, and comes into contact with the spring retaining portion 16b to be retained. The other end of the first coil portion 17a is
7c.

One end (second hooking portion) 17e of the second coil portion 17b extends in a direction opposite to the hooking portion 17c, and comes into contact with the spring hooking portion 16c to be hooked. The other end of the second coil part 17b is connected to the hook part 17c.

The latching portion 17c has a contact portion 17f fitted into the spring locking groove 13 and contacting the spring contact portion 14, and a contact portion 1c.
An extension portion 17g that connects one end of the first coil portion 17f to the other end of the first coil portion 17a and extends along the side surface 12b of the head arm 12, and another end of the contact portion 17f and the second coil portion 17b
And an extending portion 17h extending along the side surface 12c of the head arm 12 while being connected to the other end of the head arm 12.

The spring contact portion 14 is provided so as to be higher than the bottom of the spring retaining groove 13, but has a sufficient depth that the contact portion 17f of the torsion spring 17 is retained. I have. Also, the width dimension a of the spring locking groove 13 is set to a dimension sufficiently larger than the wire diameter of the torsion spring 17,
When the head arm 12 rotates, the contact portion 17f of the torsion spring 17 is loosely fitted so as to allow sliding displacement in the longitudinal direction of the head arm 12.

The torsion spring 1 formed as described above
7 is attached as shown in FIGS. That is, the coil portions 17a and 17b are fitted to the spring holding portions 15a and 15b, and one end 17d of the coil portion 17a and the second coil portion 1
One end 17e of 7b is brought into contact with spring retaining portions 16b and 16c, respectively, and contact portion 17f of retaining portion 17c is fitted into spring retaining groove 13 to come into contact with spring contact portion 14.

As a result, the tip of the head arm 12 is urged in the X direction by the spring force of the torsion spring 17 to press the upper magnetic head 5 against the lower magnetic head 3. Therefore, at the time of recording and reproduction, a magnetic disk (not shown) is inserted between the upper magnetic head 5 and the lower magnetic head 3, so that the upper magnetic head 5 slides on the upper surface of the magnetic disk, and The lower magnetic head 3 is in sliding contact with the lower surface.

The contact portion 17f of the torsion spring 17 contacts the spring contact portion 14 provided at the center of the spring locking groove 13, so that the extension portions 17 extending on both sides of the head arm 12 are provided.
A spring force corresponding to the torsion angle of the g and 17h with respect to the coil portions 17a and 17b acts on the upper magnetic head 5. Therefore, the spring force in the X direction by the torsion spring 17 acts as a head pressure of the upper magnetic head 5 and the lower magnetic head 3 on the magnetic disk.

As described above, since the coil portions 17a and 17b and the extending portions 17g and 17h of the torsion spring 17 are provided on both sides of the head arm 12,
The head carriage mechanism 11 is thinned accordingly.
Therefore, it is possible to promote a reduction in the thickness of the magnetic disk device in which the head carriage mechanism 11 is incorporated.

Since the torsion spring 17 has a pair of coil portions 17a and 17b, the total length of the coil portion is formed to be about twice as long as that of the conventional one. Accordingly, the amount of torsion of the coil portions 17a, 17b per one turn with respect to the deformation amounts (rotation angles) of the extending portions 17g, 17h is reduced, and the spring constant of the torsion spring 17 is reduced. The pressure becomes stable.

FIG. 7 shows a second embodiment of the present invention.

In FIG. 1, the head carriage mechanism 20 is provided with a projection 21a projecting rearward from a rear portion of the holding member 21, and on both sides of the projection 21a, a columnar spring holding portion extending in the lateral direction. 21b and 21c are provided.

The torsion spring 22 includes a spring holding portion 21b.
And a second coil portion 22b fitted and held in the spring holding portion 21c.
And a U-shaped hooking portion 22c that connects between the first coil portion 22a and the second coil portion 22b. The first coil portion 22a and the second coil portion 22b
Are provided so as to be located inside the hooking portions 22c, respectively, and are formed so as to reduce the mounting space in the lateral direction.

The engaging portion 22c of the torsion spring 22 is fitted in the spring engaging groove 13 of the head arm 12 and abuts on the spring abutting portion 14 like the torsion spring 17. A spring hook 23b extending in the same direction below the spring holding portions 21a and 21b protrudes from the rear surface of the head arm attachment portion 23a of the carriage base 23. Therefore, one end (not shown) extending rearward from the inside of the coil portions 22a and 22b is hooked on the spring hooking portion 23b, and the other end is connected to the hooking portion 22c.

As described above, since the coil portions 22a and 22b are held at the rear portion of the holding member 21, the head carriage mechanism 20 is reduced in thickness, and the width is reduced to reduce the size.

FIGS. 8 and 9 show a third embodiment of the present invention.

In both figures, the torsion spring 25 is formed in substantially the same shape as the right half of the aforementioned torsion spring 17 (see FIG. 6), and has a cantilevered spring shape. That is, the torsion spring 25 includes a coil portion 25a fitted and held in the spring holding portion 15b and a coil portion 25a.
And a hook portion 25b extending rearward from one end of the coil portion 25c and hooked on the spring hook portion 16c.
It comprises a hook 25c formed in a character shape. The hook 25c extends along the side surface 12c of the head arm 12 and an extension 25d. The contact portion 25e is in contact with the contact portion 14.

The contact portion 25e is inclined so that its end faces downward as shown by the solid line in FIG. This is because the torsion spring 25 has a cantilevered spring shape. When the torsion spring 25 is attached as shown in FIG. 8, the contact portion 25e is elastically deformed as shown by the broken line in FIG. The spring contact groove 14 of FIG.

Since the torsion spring 25 has a cantilevered spring shape as described above, it is difficult to press the head arm 12 in the X direction. Since the pressure is applied only to the portion 14, the head pressure of the magnetic heads 3 and 5 against the magnetic disk can be kept stable and constant.

[0030]

As described above, in the head carriage mechanism according to the present invention, the torsion spring is held along the side surface of the head arm and abuts on the upper surface from the side surface of the head arm. There is no need to secure space for the torsion spring above,
The height dimension can be reduced accordingly. Therefore, the magnetic disk device in which the head carriage mechanism is incorporated can be further reduced in thickness.

[Brief description of the drawings]

FIG. 1 is a perspective view of a first embodiment of a head carriage mechanism according to the present invention.

FIG. 2 is a side view of the head carriage mechanism shown in FIG.

FIG. 3 is a front view of a head carriage mechanism.

FIG. 4 is a plan view of a head carriage mechanism.

FIG. 5 is a perspective view of a head carriage mechanism before a torsion spring is attached.

FIG. 6 is a diagram for explaining the shape of a torsion spring.

FIG. 7 is a perspective view of a second embodiment of the present invention.

FIG. 8 is a perspective view of a third embodiment of the present invention.

FIG. 9 is a perspective view illustrating a shape of a torsion spring used in a third embodiment of the present invention.

FIG. 10 is a perspective view of a conventional head carriage mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Head carriage mechanism 12 Head arm 13 Spring locking groove 14 Spring contact part 15 Holding member 15a, 15b Spring holding part 16 Carriage base 17, 22, 25 Torsion spring

Claims (1)

(57) [Scope of request for utility model registration] 1. A carriage base having a first magnetic head supported at a distal end thereof and a head arm mounting portion formed near a base, and a second magnetic head near a free end opposed to the first magnetic head. And a head arm whose base is rotatably supported by a head arm mounting portion of the carriage base, and biases the head arm such that the second magnetic head is close to the first magnetic head. Wherein the torsion spring is held along a side surface of the head arm, and is formed so as to abut on a top surface from the side surface of the head arm to press the tip end of the head arm. Head carriage mechanism.