JPH06101180B2 - Head device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head device, and more particularly to a head device for recording / reproducing on / from a disc-shaped recording medium.

[Prior Art] Various disc-shaped recording media such as magnetic discs, compact discs, and laser discs are widely used.

In order to perform recording and reproduction on this type of recording medium, a head device suitable for each recording medium is required.

A magnetic head device is an example of such a head device.

A conventional magnetic head device of this type is shown in FIGS.

In FIG. 4 to FIG. 8, what is denoted by reference numeral 1 is a magnetic head device, and this magnetic head device comprises a head carriage 2 and
The head arm 3 is arranged so as to face the head arm 3.

As shown in FIG. 7, the head carriage 2 is formed in a rectangular shape, and one side edge thereof is provided with protrusions 5 each having a through hole 5a slidably fitted in the guide shaft 4 at a predetermined interval. Two protrusions are provided apart from each other, and a guide shaft (not shown) is sandwiched from above and below on the other side edge, and a pair of upper and lower protrusions for preventing rotation of the head carriage 2 around the guide shaft 4 is provided. Pieces 6 and 6 are projected.

An opening 2a is formed at the tip of the head carriage 2, an elastic thin plate 7 called a gimbal spring is arranged facing the opening 2a, and a magnetic head assembly 8 is provided at the center of the elastic thin plate 7. Is attached.

The magnetic head on the side of the magnetic head assembly 8 located on the lower side is called a magnetic head for a zero plane head.

On the other hand, the head arm 3 is fixed to the base end side of the head carriage 2 via a leaf spring 9.

Further, one end of the support frame 10 is fixed to the base end side of the head carriage 2 by a screw 11, but the leaf spring 9 is fastened together with the support frame 10 by the screw 11.

The other end of the support frame 10 is arranged on the upper side until it reaches almost the center of the head arm 3 in the longitudinal direction. The head arm 3 is placed between the lower surface of the tip of the support frame 10 and the upper surface of the head arm 3. The pressing spring 12 is mounted.

A magnetic head assembly 13 is fixed to the lower surface of the tip portion of the head arm 3 so as to face the magnetic head assembly 8 and form a magnetic head on one surface side.

In addition, a projecting piece that projects from the side edge of the tip of the head arm 3
An elevating means (not shown) for the head arm 3 provided on the magnetic disk drive side is engaged with the disk 14.

A magnetic disk 15 is sandwiched between the upper and lower magnetic head assemblies 8 and 13 during magnetic recording and reproduction as shown in FIG.

At the time of magnetic recording / reproducing, the magnetic head device 1 having the above-described structure is moved along the guide shaft 4 by the driving means (not shown) to move the magnetic head assemblies 8 and 13 in the radial direction of the magnetic disk 15. It is moved to perform magnetic recording / reproduction.

By the way, as shown in FIG. 6, the magnetic head assembly 8 is fixed on the elastic thin plate 7 and is connected to an external circuit through the flexible printed board 16.

At this time, the straight line A passing through the gap of the magnetic head of the magnetic head assembly 8 is selected at a position separated from the side edge of the elastic thin plate 7 by a constant distance c, and the distance d from the upper surface of the elastic thin plate 7 is constant. Is selected and positioned and fixed.

The magnetic head assembly 8 fixed to the elastic thin plate 7
Is fixed to the head carriage 2 by positioning as shown in FIG.

That is, the horizontal distance b between the straight line B passing through the guide shaft 4 and the straight line A passing through the gap of the magnetic head and the height a from the horizontal plane including the straight line B are selected and fixed at predetermined values.

On the other hand, the head arm 3 side also has a substantially similar structure as shown in FIG.

That is, the elastic thin plate 17 is fixed to the back surface of the tip portion of the head arm 3.

This elastic thin plate 17 also has an opening so as to have a gimbal spring structure.
The magnetic head assembly 13 has 17a and 17b, and the magnetic head assembly 13 is fixed to the portion surrounded by these.

[Problems to be Solved by the Invention] However, when the above-mentioned structure is adopted, the magnetic head assembly is positioned and fixed to the elastic thin plate 7 or 17, and further, these are positioned and fixed to the head carriage 2. Requires a single assembly process.

Therefore, assembling errors of the respective parts are integrated and appear when they are attached to the head carriage or the head arm 3.

Therefore, although the number of parts and the number of assembling steps are large and the cost is increased, the positioning accuracy is deteriorated.

Further, the magnetic head device assembled in this way is
There is a problem that the dimensional accuracy is further deteriorated due to the difference in expansion coefficient due to changes in external conditions such as external temperature and humidity, and the reliability is remarkably reduced.

The above-mentioned problems can be said not only with respect to the magnetic head assembly on the side of the head carriage 2 located on the lower side in the drawing, but also with respect to the magnetic head assembly on the side of the head arm 3 located on the upper side.

The above-described problems apply to head devices other than the magnetic head device in exactly the same manner.

[Means for Solving Problems] In the present invention, in order to solve the above-mentioned problems, a carriage that is movably provided by engaging a guide portion,
A head device comprising an arm rotatably provided on the carriage, and first and second heads arranged on the carriage and the arm so as to face each other when a recording medium is sandwiched, The carriage has a structure in which an elastic support portion surrounded by a plurality of grooves is directly formed at the tip end portion, and the first head is fixed to the elastic support portion.

[Operation] When the above-mentioned configuration is adopted, the first head is directly fixed to the elastic support portion of the carriage without the elastic thin plate interposed, and therefore, the positioning between the first thin head and the elastic thin plate is not required, and the assembly is performed. The accuracy can be greatly improved and the first head can be elastically supported.

[Examples] Hereinafter, details of the present invention will be described based on Examples shown in the drawings.

[First Embodiment] FIGS. 1 to 3 are views for explaining an embodiment of the present invention, in which the same or corresponding parts as those in FIGS. 4 to 8 are designated by the same reference numerals, The description is omitted.

In this embodiment, a groove 2b directly surrounding the corner of the quadrilateral is formed on the upper surface of the tip of the head carriage 2, and an opening into which the magnetic head assembly located in the center of the thin plate portion 2c surrounded by these is fitted. And a portion 2d is formed.

When such a structure is adopted, when the magnetic head assembly 8 is attached, as shown in FIG. 2, the horizontal distance b between the straight line B passing through the guide shaft 4 and the straight line passing through the gap of the magnetic head and the straight line B are included. The magnetic head assembly 8 can be fixed only by positioning and fixing it so that the height a from the horizontal plane to the gap becomes a predetermined dimension.

Therefore, as in the conventional example described above, the positioning with respect to the elastic thin plate or the like can be performed, and all the assembling steps can be omitted, so that the assembling accuracy is significantly increased.

Also, as shown in FIG. 3, an opening is formed on the head arm 3 side.
If 3a and 3b are formed and the magnetic head assembly 13 is fixed to the thin plate 3c surrounded by these, the magnetic head assembly 13 can be accurately positioned and fixed with a small number of assembling steps, similarly to the head carriage side.

Further, although the above-described embodiment has been described by taking the magnetic head device as an example, the present invention can be applied to a head device for a compact disk or a laser disk in exactly the same manner.

[Effects of the Invention] As is apparent from the above description, according to the present invention, a carriage that is engaged with a guide portion and is movably provided, an arm that is rotatably provided on this carriage, and a recording device. In a head device provided with the carriage and first and second heads arranged on the arm so as to face each other when a medium is sandwiched, the carriage is surrounded by a plurality of grooves at its tip. Since the elastic support portion is directly formed and the first head is fixed to the elastic support portion, the number of assembling steps and the number of parts are reduced, and the assembling accuracy is greatly improved and the Cost reduction can be realized. Also,
An excellent effect that the first head can be elastically supported is obtained.

[Brief description of drawings]

1 to 3 are diagrams for explaining an embodiment of the present invention. FIG. 1 is a perspective view of a head carriage, FIG. 2 is a perspective view of a head carriage in an assembled state, and FIG. 3 is a perspective view of a head arm. FIG. 4 is a perspective view of a head carriage for explaining the second embodiment of the present invention, FIG. 5 is a perspective view of a head carriage for explaining the third embodiment of the present invention, and FIGS. FIG. 4 illustrates a conventional structure. FIG. 4 is a perspective view of a magnetic head device, FIG. 5 is a side view of the magnetic head device, FIG. 6 is a perspective view of a magnetic head assembly, and FIG. 7 is a head carriage. FIG. 8 is a perspective view of the head arm. 1 ... Magnetic head device 2 ... Head carriage 3 ... Head arm 4 ... Guide shaft 8 ... Magnetic head assembly

Claims (1)

[Claims] 1. A carriage movably provided in engagement with a guide portion, an arm rotatably provided on the carriage, the carriage and the arm so as to face each other when a recording medium is nipped. A head device including: a first head and a second head disposed on the carriage; and an elastic support portion surrounded by a plurality of grooves is directly formed on a tip portion of the carriage, and the carriage is provided with the first head. Is fixed to the elastic support portion.