JPH0576718B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a head device, and more particularly to a head device that records and reproduces information using two head elements supported oppositely on both sides of a recording medium. be.

[Prior Art] As a head device of this type, a magnetic head device used in a floppy disk device that records and reproduces information on both sides of a floppy disk, which is a flexible magnetic recording medium, is known.

The conventional structure of this magnetic head device is shown in a front view in FIG. 1 and an exploded perspective view in FIG.

In the configuration of the magnetic head device, which is generally indicated by the reference numeral 1 in FIG. 1, a carriage is indicated by the reference numeral 2, which supports the entire device and is protruded from the front and rear ends of the left side edge shown in FIG. bearing part 2
It is slidably provided on a guide bar in a floppy disk device (not shown) through holes 2e, 2g of holes 2e, 2g of d and 2f and a groove 2i of a bearing part 2h protruding from the middle part of the right side edge. It is driven by the driving means in the linear direction shown by arrows A and B in FIG.

The rear end of the upper surface of the carriage 2 has a screw hole 2a,
A first magnetic head 3 for recording and reproducing information on the lower surface of the recording medium is elastically supported at the tip thereof via a metal plate 4.

The magnetic head 3 is positioned and attached so that its sliding surface against the disk 5 contacts the lower surface of the disk 5 at the same height or slightly pushes up the lower surface of the disk 5. As a result, the sliding surface of the magnetic head 3 corrects the vibration of the disk 5 due to rotation during recording and reproducing, or the error in the clamping height caused by the disk clamping means (not shown), and the disk 5 is corrected by the sliding surface of the magnetic head 3. It is positioned within a certain range based on the reference.

On the other hand, on both sides, an arm is designated by the reference numeral 6, and a second magnetic head 8 for recording and reproducing information on the upper surface of the disk 5 is attached to a pressing pin 7 on the lower surface of the tip of the arm.
It is positioned and attached via a gimbal plate 9 similar to the metal plate 4 so as to be able to swing around the metal plate 4, and is disposed facing the first magnetic head 3.

In addition, the rear end surface of the arm 6 has holes 13a at both ends.
A substantially rectangular leaf spring 13 having a diameter 13b is installed.

And the arm 6 is the arm 6 as shown in FIG.
The leaf spring 13 is attached to the screw 12 via the spring column 10 that supports the spring 11 that presses the spring 11 downward.
It is attached on the carriage 2 by fixing it on the convex part 2c of the carriage 2 with a and 12b,
Supported.

To attach the arm 6, as shown in FIG.
a, 13b, and screw holes 2a, 2b of arm 2.
After temporarily fixing the arm 6 by screwing it in, and interposing the spring 11 between the arm 6 and the spring support 10, firmly tighten the screws 12a and 12b while positioning the arm 6 with respect to the carriage 2 to tighten the leaf spring 13. This is done by fixing. By fixing this arm 6, the magnetic head device 1 is completed.

However, like this, the two screws 12a and 12b
In this structure, the arm 6 is positioned and fixed by tightening the individual screws 12a, 12b.
The tightening torque generates rotational moments G and I with the screw 12a as the fulcrum, and rotational moments H and J with the screw 12b as the fulcrum, as shown by arrows in FIGS. 3a and 3b.

Therefore, in order to position and attach the arm 6 with high precision, it is necessary to equalize the tightening torque of the two screws 12a and 12b and tighten them alternately and gradually. However, the work was extremely difficult because it could not be fixed.

[Objective] The present invention has been made in view of the above circumstances, and is not limited to the magnetic head device for the above-mentioned floppy disk device, but is also applicable to recording and reproducing information on both sides of a recording medium. two head elements to be used are supported oppositely by first and second support members;
In a head device in which the first support member is driven in a linear direction, the head element is supported at the front end of the second support member, and the rear end is fixed to the first support member,
It is an object of the present invention to provide a head device that can easily and accurately position and fix a second support member in a stable state during the manufacturing process using a structure that can be easily realized at low cost.

[Structure of the Invention] In order to achieve the above object, the present invention provides a head device of the type described above, in which the rear end of the second support member passes through the center of the recording/reproducing portion of the head element in the driving direction. A structure is adopted in which the parts are fixed on a line parallel to the line and the parts arranged offset from the parallel line.

[Example] Hereinafter, details of an example of the present invention will be described with reference to FIG. 4 and subsequent figures. The above-mentioned magnetic head device for a floppy disk device is used as an example here, and in FIG. 4 and below, the same or corresponding members as in FIGS. 1 to 3 of the conventional example are given the same reference numerals. , description of the same parts will be omitted.

[First Embodiment] FIG. 4 is an exploded perspective view showing the structure of a magnetic head device according to a first embodiment of the present invention.

As shown in the figure, in this embodiment, the convex portion 2c of the carriage 2 is formed so that the left end side in the figure protrudes more than the conventional example in FIG. 2, and has a hole 2e for inserting a guide bar (not shown). It is formed by being combined with the bearing part.

Screw holes 2a and 2b are formed on the upper surface of the convex portion 2c, and in this case, one screw hole 2a is formed on the center line indicated by the symbol L1 at the center of the upper surface of the convex portion 2c, and this center line L1 is A line parallel to the driving directions A and B of the carriage 2 passes through the center of the recording/reproducing part of the magnetic head 3 (not shown in detail here), for example, in the case of a tunnel erase type, the center between the recording/reproducing magnetic gap and the erasing magnetic gap. It's summery.

The other screw hole 2b is formed at the left end of the upper surface of the convex portion 2c, which is offset from the center line L1.

On the other hand, in the configuration on the arm 6 side, the leaf spring 13 is formed in such a shape that its left end in the figure is more protruding than before, corresponding to the upper surface of the convex portion 2c of the carriage 2.

Holes 13a and 13b are formed in the leaf spring 13, and in this case, one of the holes 13a is a screw hole 2.
Corresponding to a, the hole is formed in the center of the leaf spring 13 as a hole for positioning and fixing the arm 6, which will be described later, and is formed on the center line indicated by the symbol L2.
This center line L2 passes through the center of the recording/reproducing part of the magnetic head 8 and is parallel to the longitudinal direction of the arm 6.
1.

The other hole 13b corresponds to the screw hole 2b, and is formed at the left end of the leaf spring 13 as a hole for fixing the arm 6 to prevent it from shifting, which will be described later.

Based on the above configuration, the screw 12a is passed through the hole 13a of the leaf spring 13 through the hole of the spring support 10 (not shown), and is screwed into the screw hole 2a of the arm 2 to temporarily fix the arm 6. At the same time, after similarly interposing the aforementioned spring 11 (not shown) between the arm 6 and the spring support 10, align the aforementioned center line L2 with the center line L1, and while positioning the arm 6 with respect to the carriage 2, tighten the screws. 12a
The arm 6 is attached to the carriage 2 by strongly tightening and fixing the leaf spring 13.

In this case, positioning using one screw 12a,
Since it is fixed, the rotational moment generated by the screw tightening torque is only the rotational moment K with the screw 12a as the fulcrum as shown in Fig. 5. Unlike the conventional case, there is no need to equalize the tightening torque of multiple screws, so the arm 6 can be positioned and fixed in a stable state extremely easily and with high precision.

Furthermore, after the above fixing, the center line L1 of the leaf spring 13
Pass the screw 12b through the deviated hole 13b, screw it into the screw hole 2b of the carriage 2, and tighten.

As a result, as shown in FIG. 5, it is possible to cope with the rotational moment M about the screw 12a that is generated when an external force in the direction of the arrow F is applied to the arm 6, and to prevent the arm 6 from shifting due to the external force.

[Second Embodiment] By the way, in the configuration of the first embodiment described above, the fourth embodiment
When there is twist as shown by arrow N in the figure, this causes twist in the arm 6 as shown by arrow P. Therefore, in order to deal with this twist, the structure of the second embodiment of the present invention, which is a modified structure of the first embodiment, is changed to the sixth embodiment.
As shown in the figure.

As shown in the figure, in this embodiment, the leaf spring 13 has a substantially rectangular parallelepiped block-shaped reinforcing part designated by the reference numeral 13c, and the leaf spring 13 shown by the reference numeral 14 in FIGS.
It is integrally formed in the region 3 with a width corresponding to the arm 6 by molding or the like.

Due to the presence of this reinforcing portion 13c, the occurrence of twisting of the leaf spring 13 described above is greatly reduced, and the arm 6
It is possible to prevent the occurrence of twisting.

In the configurations of the first and second embodiments described above, instead of fixing the arm 6 with the screw 12b, other fixing means such as adhesive may be used to prevent the arm 6 from shifting. Further, although the screw 12a is used for positioning and fixing, other fixing means and other fixing structures may be used as long as they can be used as a fulcrum during positioning.

Furthermore, the configuration of the present invention relating to the positioning and fixing of the supporting member of the head element as described above is not limited to the magnetic head device of the embodiment, but can of course be applied to other magnetic head devices of the type described in the object section. Of course, the present invention can also be widely applied to other head devices such as optical head devices.

[Effects] As is clear from the above description, according to the present invention, two head elements for recording and reproducing information on both sides of a recording medium are supported facing each other by first and second support members, In a head device in which the first support member is driven in a linear direction, the second support member supports a head element at its distal end, and its rear end is fixed to the first support member, the second support member The rear end of the head element is fixed in an extremely simple and inexpensive manner at a location disposed on a line passing near the recording/reproducing portion of the head element and substantially parallel to the driving direction, and at a location deviated from the parallel line. By employing a structure that can be realized, an excellent effect can be obtained in that the positioning and fixing of the second support member in the manufacturing process can be performed in a stable state, extremely easily, and with high precision.

[Brief explanation of the drawing]

1 and 2 are a front view and an exploded perspective view illustrating the structure and arm attachment of a conventional magnetic head device, and FIGS. 3a and 3b are
A top view and a side view illustrating the positioning of the arm in Figures and Figure 2, and the rotational moment when fixed;
FIG. 4 is an exploded perspective view illustrating the structure of the first embodiment of the present invention and the attachment of the arm, and FIG. 5 is a top view illustrating the positioning of the arm in FIG. 4, when it is fixed, and the rotational moment due to external force. , FIG. 6 is a perspective view showing the structure of a second embodiment of the present invention. 1... Magnetic head device, 2... Carriage, 2a,
2b...screw hole, 3,8...magnetic head, 4...metal plate, 5...disk, 6...arm, 9...gimbal plate, 10...spring support, 11...spring, 12a, 12b...screw, 13...plate spring,
13a, 13b...hole, 13c...plate spring, 13c...
Reinforcement part, L1, L2...center line.

Claims (1)

[Claims] 1 Two head elements for recording and reproducing information on both sides of a recording medium are supported facing each other by first and second support members, the first support member being driven in a linear direction, and the second head element being driven in a linear direction. In a head device in which the member supports a head element at its distal end and its rear end is fixed to a first support member, the member passes through the rear end of the second support member near the recording/reproducing portion of the head element. a location arranged on a line substantially parallel to the driving direction;
A head device, characterized in that the head device is fixed at a location offset from the parallel line.