JPH04335270A - Moving device of recording and reproducing head - Google Patents

Abstract

PURPOSE:To make the device small in size and light in weight and to increase the recording and reproducing speed by mounting a bobbinless coil to the carriage in the state that the both end faces or the carriage side of coil end faces are held between, so as to drive a carriage. CONSTITUTION:A bracket 71 for supporting the coil is mounted by screws, etc., on the left/right sides of both sides of the moving direction guided by supporting guides 8 of the carriage 7. The bobbinless coil 9a is pushed in between a pair of confronted holding frames 71a for coil end faces on this bracket 71 so that the coil end faces are caught in. Or further, the side face of carriage 7 side of the coil 9a is adhered on the base surface 71b of bracket 71 by an adhesive. By this procedure, the recording/reproducing head 4 is rapidly moved to the specified position of recording track without causing a shearing elastic deformation, since the carriage 7 is pushed by the coil 9a with its entire coil end face, then the recording and reproducing speed can be increased.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording/reproducing head moving device for a disk drive device that reads information from or writes information to a recording disk such as a CD, magneto-optical disk, or magnetic disk.

0002

2. Description of the Related Art As a recording/reproducing head moving device as described above, a carriage carrying a recording/reproducing head is supported so as to be linearly movable parallel to a recording disk surface by two parallel supporting means on both sides of the recording/reproducing head position. The carriage is moved by a driving means comprising two parallel coils on both sides of the recording/reproducing head mounted on the carriage and two parallel fixed magnetic circuit forming members forming a single loop and intersecting the coils. It is known that things move. For example, the schematic plan view, side view, and perspective view of FIGS.
Examples of magneto-optical disk drives described in each publication of No. 192048 are shown below.

In the disk drive device shown in FIGS. 7 to 9, when a magneto-optical disk cartridge 11 is inserted into a cartridge holder 2 from the cartridge entrance 1a shown in FIG. The shutter of the cartridge 11 is opened by an action member (not shown), and when the insertion is completed, the cartridge holder 2 and the magnetic field generating means 10 are lowered from the two-dot chain line position shown in FIG. 8 to the solid line position by an unillustrated elevating means. is carried out, and the magneto-optical disk of the cartridge 11 in the cartridge holder 2 is equipped with the recording/reproducing head 4, which includes an objective lens 4a and an actuator 4b for causing the position of the objective lens 4a to follow the track of the magneto-optical disk. As it approaches the carriage 7, it engages with the rotating means 3, and the magnetic field generating means 10 approaches the magneto-optical disk and becomes ready for driving. By rotating the disk, driving the recording/reproducing head 4 and the accompanying laser light source 5 or the reflected light detecting element 6, and driving the magnetic field generating means 10, information is read from the magneto-optical disk and magneto-optical data is generated. It writes information to the disk, and when reading or writing is finished, the rotating means 3 rotates, the recording/reproducing head 4 and the magnetic field generating means 1
0 etc., the carriage 7 is returned to its original position, the cartridge holder 2 and the magnetic field generating means 10 are raised to their original positions, the cartridge 11 is ejected to the cartridge entrance/exit port 1a by the action member, and, Cartridge 1
1 is returned to its original state by taking it out from the cartridge entrance.

[0004] In this drive device, the carriage 7 is
Device frame 1 at a symmetrical position with respect to the recording/playback head 4 position.
The magneto-optical disk is supported movably in parallel to the surface of the magneto-optical disk by being fitted with two parallel support guides 8 fixedly provided. Further, the carriage driving means 9 includes two parallel coils 9a attached to both sides symmetrically with respect to the position of the recording/reproducing head 4 of the carriage 7, and a magnet 9b2 bonded to a single loop-shaped magnetic body 9b1. It consists of two parallel magnetic circuit forming members 9b which are fixed to the device frame 1 and intersect with the coils 9a, respectively. The carriage 7 is guided by the support guide 8 in accordance with Fleming's law according to the direction of the current flowing in the same direction in both coils 9a, and is moved parallel to the magneto-optical disk surface as shown in FIG.
It is moved to the left or right in FIG.

In such a conventional recording/reproducing head moving device, in order to reduce the overall weight of the carriage and make it easier to move, the gap between the intersection of the coil 9a and the magnetic circuit forming member 9b is reduced, thereby increasing the efficiency of VCM. A so-called bobbinless coil, in which the windings are hardened with resin, is used as the coil 9a in order to increase the driving force and obtain a large driving force, and also to reduce the thickness of the device. ing. The coil 9a of the bobbinless coil is attached by directly bonding the side surfaces to the left and right side surfaces on both sides in the direction of movement of the carriage 7, or by bonding the sides to a coil holder. It is fixed to the carriage 7 by being attached to the side surface using a method such as screwing.

[0006]

[Problems to be Solved by the Invention] A disk drive device using the conventional recording/reproducing head moving device as described above cannot obtain a sufficient servo band due to unnecessary low frequency resonance of the bobbinless coil portion. First, there is a problem in that it takes time for the recording/reproducing head to align with a designated recording track on the recording disk.

The present invention has been made to solve this problem, and provides a recording/reproducing head moving system suitable for use in a disk drive device that can easily align the position of the recording/reproducing head with a specified position on a recording disk. The purpose is to provide equipment.

[0008]

[Means for Solving the Problems] The present invention provides a conventional recording/reproducing head moving device as described above, in which a bobbinless coil with low rigidity of a carriage driving means is attached to a carriage or a carriage with adhesive on the side surface. The inventor of the present invention found that since the driving force is transmitted to the carriage in the state of a cantilever beam glued to the This was achieved as a result of research, and a carriage equipped with a recording/reproducing head is supported so as to be movable in a straight line parallel to the recording disk surface by two parallel support means on both sides of the recording/reproducing head position, and a recording/reproducing head attached to the carriage is supported. Reading information from a recording disk by being moved by a driving means consisting of two parallel coils on both sides of the head position and two fixed magnetic circuit forming members forming a single loop shape and intersecting with the coils. or in a recording/reproducing head moving device of a disk drive device in which information is written to a recording disk, the two coils are bobbinless coils and are mounted on the carriage with both end surfaces sandwiched; Alternatively, the recording/reproducing head moving device is fitted into a recess provided on the left and right side surfaces of the carriage in the moving direction, and is attached to the carriage with at least the end surface of the coil layer on the carriage side being sandwiched between the side surfaces of the recess. It is in.

[0009]

[Function] Even if a bobbinless coil is used as the coil of the carriage driving means, the recording/reproducing head moving device of the present invention is capable of attaching the coil to the carriage with both end faces of the coil or at least the end face of the coil layer on the carriage side sandwiched therebetween. Because of this, the coil transmits the driving force to the carriage over the entire end face or the entire end face of the coil layer on the carriage side, and there is less shear elastic deformation, which makes it easier to align the position of the recording/reproducing head with the designated recording track of the recording disk. can be easily done to increase the speed of recording and playback,
This makes it possible to reduce the size and weight of disk drives.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below with reference to embodiments shown in FIGS. 1 to 6.

FIGS. 1 to 6 are perspective views showing an example of the recording/reproducing head moving device of the present invention before main parts are assembled, respectively.
In FIGS. 1 to 6, the same reference numerals as in FIGS. 7 to 9 indicate the same functional members. Further, FIGS. 1 to 3 show an example of the present invention in which the coil of the carriage driving means is attached to the carriage with both end surfaces sandwiched, and the coil on one side is omitted. 4 to 6 show an example of the present invention in which the coil of the carriage driving means is fitted into a recess provided in the carriage and is attached to the carriage with at least the end face of the coil on the carriage side being sandwiched between the sides of the recess. There is.

The example in FIG. 1 shows a support guide 8 for a carriage 7.
A pair of left and right coil support brackets 71, which are coil holding members, are attached to the left and right side surfaces on both sides in the direction of movement guided by the coil support brackets 71 using screws (not shown) or the like.
Pushing the bobbinless coil 9a between a pair of opposing coil end face clamping frames 71a so that the coil end face is sandwiched by the pair of coil end face clamping frames 71a;
Alternatively, the coil 9a is attached to the carriage 7 by bonding the side surface of the coil 9a on the carriage 7 side to the base surface 71b of the coil support bracket 71 with adhesive. In this example, the coil 9a may be attached to the coil support bracket 71 first, and then the coil support bracket 71 may be attached to the carriage 7.

In the example shown in FIG. 2, a pair of front and rear coil support brackets 72 are attached to the front and rear surfaces of the carriage 7 in the moving direction using screws (not shown), and the coil support brackets 72 are attached between the coil end face clamping frame portions 72a of both brackets 72. The carriage 7 can be removed by pushing the coil 9a in the same manner as in the above, or by gluing the side surface of the coil 9a to the side surface of the carriage 7 with adhesive.
Attach coil 9a to.

The example shown in FIG. 3 is an example in which the coil support bracket 71 or 72 of the example shown in FIG. 1 or 2 is formed integrally with the carriage.

In the example of FIGS. 1 to 3, the coil 9a
pushes the carriage 7 with the entire end face of the coil, so the carriage 7 is forcefully pushed in response to the current signal applied to the coil 9a without being subjected to shear elastic deformation, and the recording/reproducing head 4 is quickly moved to the specified recording track position on the recording disk. It is also possible to increase the speed of recording and playback.

The example shown in FIG. 4 is different from the example shown in FIG. 3 in that the carriage 7 is the same as that of the example shown in FIG. Differently, in this example, the coil 9a is attached to the carriage 7 with the carriage-side end face of the coil end face sandwiched between grooves on the side surface of the carriage 7.

The example shown in FIG. 5 differs from the example shown in FIG. 4 in that the groove on the side surface of the carriage 7 is a downward dead end groove, and the vertical position of the coil 9a can be regulated by the downward dead end. .

The example shown in FIG. 6 is different from the examples shown in FIGS. 4 and 5 in that the groove on the side surface of the carriage 7 has a dead-end hole not only at the bottom but also at the top, into which the side surface of the coil 9a fits and falls. different.

In the examples of FIGS. 4 to 6, the coil 9a
pushes the carriage 7 with the end face of the coil on the side of the carriage 7, so at least that end face does not undergo shear elastic deformation, and therefore pushes the carriage 7 more forcefully than the conventional recording/reproducing head moving device to move the recording/reproducing head 4.
can be quickly brought to the designated recording track position of the recording disk, and the recording and reproduction speeds can also be increased.

[0020]

As described above, according to the present invention, the disk drive device can be made smaller and lighter by using a bobbinless coil for the coil of the carriage drive means, and moreover, the recording/reproducing head can be moved to the designated recording track of the recording disk. It can be quickly brought to the desired location, and recording and playback speeds can also be increased.

[Brief explanation of drawings]

1 to 6 are perspective views before assembly of main parts showing examples of the recording/reproducing head moving device of the present invention, respectively, and FIGS. 7, 8, and 9 are disk drive devices in which the recording/reproducing head moving device of the present invention is used. FIG. 2 is a schematic configuration plan view, side view, and perspective view showing an example of the configuration.

[Explanation of symbols]

4...recording/playback head,
7... Carriage, 8... Support guide, 9... Carriage driving means, 9a... Coil,
9b...Magnetic circuit forming member, 7
1, 72...Coil support bracket, 71
a...Coil end face clamping frame, 71b...Base surface,
72a...Coil side clamping frame part.

Claims (7)

[Claims] 1. A carriage carrying a recording/reproducing head is supported by two parallel support means on both sides of the recording/reproducing head position so as to be movable in a straight line parallel to the recording disk surface, The device is driven by a driving means consisting of two parallel coils and two fixed magnetic circuit forming members forming a single loop shape and intersecting the coils, respectively, to read information from or to the recording disk. A recording/reproducing head moving device for a disk drive device in which information is written, wherein the two coils are bobbinless coils and are mounted on the carriage with both end surfaces sandwiched. Head moving device. 2. The recording/reproducing head moving device according to claim 1, wherein the coil holding members attached to the left and right side surfaces of the carriage in the moving direction sandwich both end surfaces of the coil. 3. The recording/reproducing head moving device according to claim 1, wherein the coil holding members attached to the front and rear surfaces in the moving direction of the carriage sandwich both end surfaces of the coil. 4. A carriage on which the recording/reproducing head is mounted is supported by two parallel support means on both sides of the recording/reproducing head position so as to be movable in a straight line parallel to the recording disk surface; The drive means is driven by a driving means consisting of two coils and two fixed magnetic circuit forming members that form a single loop shape and intersect with the coils, respectively, to read information from the recording disk or to transfer information to the recording disk. In a recording/reproducing head moving device of a disk drive device in which writing is performed, the two coils are bobbinless coils, and are fitted into recesses provided on the left and right side surfaces in the moving direction of the carriage, so that at least the coil end surface is moved by the side surfaces of the recess. A recording/reproducing head moving device characterized in that the recording/reproducing head moving device is attached to a carriage with the carriage side thereof being sandwiched. 5. The recording/reproducing head moving device according to claim 4, wherein the depression is a vertical groove. 6. The recording/reproducing head moving device according to claim 4, wherein the recess is a vertical groove with a bottom end. 7. The recording/reproducing head moving device according to claim 4, wherein the recess is a hole into which a portion of the coil on the carriage side falls.