JPS61178784A - Head device - Google Patents

Abstract

PURPOSE:To make it possible to easily and securely position and fix a second supporting member with high accuracy by fixing the rear end of a second supporting member at a location on a line passing through the center of the recording and reproducing portion of a head element and running parallel to the driving direction and a location offset from the parallel line. CONSTITUTION:Since the positioning and fixing are performed by a screw 12a, only the rotational moment K about the screw 12a as fulcrum acts as rotational moment produced from the torque produced by screwing. Hence it is no longer necessary to provide for uniform torque for tightening plural screws so that an arm 6 can be very easily positioned and fixed in the stable state with high accuracy. After fixing, a screw 12b is passed through a hole 13b offset from a centerline L1 of a plate spring 13 and screwed into a screw hole 2b of a carriage 2. In this manner, the rotational moment about the screw 12a produced when an external force is applied to the arm 6 in the direction of the arrow mark F can be coped with to prevent positional deviation of the arm 16 under the external force.

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. 2.

In the configuration of the magnetic head device, which is generally indicated by the symbol l in FIG. 1, the symbol ? 2 is a carriage that supports the entire device and has holes 2e and 2g in bearing parts 2d and 2f protruding from the front and rear ends of the left side edge shown in FIG. The guide 1 in the floppy disk device (not shown) is inserted through the groove 21 of the protruding bearing portion 2h.
-- It is slidably provided on the shaft and is driven in the linear direction shown by arrows A and B in FIG. 1 by a driving means (not shown).

A screw hole 2a is provided at the rear end of the upper surface of the carriage 2.

2b is formed, and a first magnetic helad 3 for recording and reproducing information on the lower surface of the recording medium is elastically supported at the tip via a metal plate 4.

The sliding surface of the magnetic helad 3 with respect to the disk 5 is the disk 5.
It is positioned and attached so as to be in contact with the lower surface of the disk 5 at the same height or to slightly push up the lower surface of the disk 5. This allows the disk 5 to rotate during recording and playback.
oscillation, or an error in the clamping height caused by a disk clamping means (not shown) is corrected by the sliding surface of the magnetic helad 3, and the disk 5 is positioned within a certain range with respect to the sliding surface. be done.

On the other hand, in both figures, the reference numeral 6 is an arm, and a second magnetic field 8 for recording and reproducing information on the upper surface of the disk 5 is attached to the lower surface of the tip of the arm so as to be able to swing around a pressing pin 7. It is positioned and attached to the metal plate 4 through a gimbal plate 9 similar to the metal plate 4, and is arranged opposite to the first magnetic helad 3.

Further, 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.

As shown in FIG.
By fixing the leaf spring 13 on the convex portion 2C of the carriage 2 with screws 12a and 12b, it is attached and supported on the carriage 2.

As shown in FIG. 2, this arm 6 is attached via a screw 12a through a hole in a spring support lO (not shown here).
, 12b through the holes 13a and 13b of the leaf spring 13, and the screw hole 2a of the arm 2.

2b to temporarily fasten the arm 6 and interpose the spring 11 between the arm 6 and the spring support 10. After positioning the arm 6 with respect to the carriage 2, firmly tighten the screws 12a and 12b to release the leaf spring 13. This is done by fixing the By fixing this arm 6, the magnetic head device 1 is completed.

However, in this structure in which the arm 6 is positioned and fixed by tightening the two screws 12a and 12b, the torque of tightening the individual screws 12a and 12b causes the damage shown in FIGS. 3(a) and 3(b) to occur. As shown by the arrow in , the rotational moment G with the screw 12a as the fulcrum and ! , and rotational moments) H and J with the screw 12b as the fulcrum.

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.
The work was extremely difficult as it was not possible to position and fix it in a stable state.

[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 floral disk device, but is also capable of recording information on both sides of a recording medium. Two head elements that perform playback are supported by first and second supporting members facing each other, the first supporting member is driven in a linear direction, and the second supporting member supports the head element at its tip. , a head device whose rear end portion is fixed to a 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 above type, in which the rear end portion 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. Here, the above-mentioned magnetic head device for a floppy disk device is used as an example, 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. Explanation 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 same 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 shown 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 top surface of the convex portion 2C, and in this case, one of the screw holes 2a is formed on the center line indicated by the symbol Ll at the center of the top surface of the convex portion 2C, and this center line L1 is Center 1 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, a line passing through the center between the recording/reproducing magnetic gap and the erasing magnetic gap and parallel to the drive directions A and B of the carriage 2; It has become.

In addition, the other screw hole 2b has a convex portion 2c that is deviated from the center line Ll.
It is formed on the left end of the top surface.

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 hole 13a corresponds to the screw hole 2a for positioning the arm 6, which will be described later.

A hole is formed in the center of the leaf spring 13 as a fixing hole,
It is formed on the center line indicated by the symbol L2. This center line L2 passes through the center of the recording/reproducing portion of the magnetic helad 8 and is a line parallel to the longitudinal direction of the arm 6, and is aligned with the center line L1 during positioning, which will be described later.

The other hole 13b corresponds to the screw hole 2b, and is used as a fixing hole for preventing the arm 6 from moving backward.
It is formed at the left end of 3.

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, aligning the aforementioned center line L2 with the center line Ll, and positioning the arm 6 with respect to the carriage 2, screw the 12a
The arm 6 is attached to the carriage 2 by strongly tightening and fixing the leaf spring 13.

In this case, positioning is performed using one screw 12a.

Since it is fixed, the rotational moment generated by the screw tightening torque is only the rotational moment about the screw 12a as a fulcrum, as shown in Fig. 5. Unlike the conventional method, 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-mentioned fixation, the screw 12b is passed through the hole 13b of the leaf spring 13 which is offset from the center line L1, and then screwed into the screw hole 2b of the carriage 2 and tightened.

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 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, if there is twisting as shown by arrow N in FIG.
Twisting occurs as shown by arrow P. Therefore, in order to deal with this twist, the second embodiment of the present invention is modified from the structure of the first embodiment.
The structure of the embodiment is shown in FIG.

As shown in the figure, in this embodiment, the leaf spring 13 has a reference numeral 1.
The substantially rectangular block-shaped reinforcement section indicated by 3c is shown in FIG.
It is integrally formed in a region of the leaf spring 13 indicated by the reference numeral 14 in FIG. 5 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 can be significantly reduced, and the occurrence of twisting of the arm 6 can be prevented.

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

Furthermore, the configuration of the present invention related to positioning and fixing of the support 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 as long as they are 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 supporting members. , 1st
In a head device in which the supporting member is driven in a linear direction, the second supporting member supports the head element at the leading end, and the rear end is fixed to the first supporting member, the second supporting member is driven in a linear direction. This can be achieved extremely simply and at low cost by fixing the end portions at a location located on a line passing near the recording/reproducing portion of the head element and substantially parallel to the driving direction, and at a location offset from the parallel line. By employing this structure, 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. 3(a) and 3(b) are FIGS. 1 and 2.
The figure shows a top view and a side view illustrating the positioning of the arm and the rotational moment when it is 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. FIG. 4 is a top view illustrating arm positioning, fixing, and rotational moment due to external force, and 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 lO...Spring support 11...Springs 12a, 12b...
Screw 13... Leaf springs 13a, 13b... Hole 1
3c... Leaf spring 13c... Reinforcement part LL, L
2...Center line Figure 2 Figure 3 HG Figure 5 M Figure 6

Claims (1)

[Claims] Two head elements that record and reproduce information on both sides of a recording medium are supported by first and second supporting members facing each other, the first supporting member being driven in a linear direction, and the second supporting member being driven in a linear direction. In a head device in which a head element is supported at a front end portion and a rear end portion is fixed to a first support member, the rear end portion of the second support member is passed through the vicinity of the recording/reproducing portion of the head element. 1. A head device, characterized in that it is fixed at a location disposed on a line substantially parallel to the driving direction and at a location deviated from the parallel line.