JPH0718053Y2 - Head support device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The head support device of the present invention will be described according to the following items.

A. Industrial fields of use B. Overview of the device C. Prior art [Figs. 7 and 8] D. Problems to be solved by the device [Figs. 7 and 8] E. Solving problems F. Embodiment [FIGS. 1 to 6] a. Magnetic disk cassette [FIGS. 1 and 2] b. Outer casing, mechanical chassis [FIGS. 1 and 2] c. Recording Playback unit [Figs. 1 to 6] c-1. Disk drive mechanism, cassette carrier [Fig. 1,
FIG. 2] c-2. Head support device [FIGS. 1 to 6] c-2-a. Moving base [FIGS. 1 to 3] c-2-b. Head arm [FIGS. 1 to 1] FIG. 5] c-2-c. Head supporting piece of head arm and magnetic head [FIGS. 1 to 6] c-2-d. Head supporting piece of moving base and magnetic head [FIGS. 1 to 3] Fig.] C-3. Head support device moving means [Figs. 1 and 2] d. Recording or reproduction e. Height of outer casing G. Effect of device (A. Industrial application field) The present invention is novel Head support device. More specifically, a head supporting device having an arm for supporting a recording / reproducing head in contact with a recording medium disc at a tip end thereof, in particular, when the recording medium disc is not mounted on the disc mounting part of the recording / reproducing part, It is rotatably supported so that it stands by at a position with a disc insertion space between it and the recording / playback unit, and when the recording medium disc is mounted in the disc mounting unit, its head moves to a position where it comes into contact with the recording medium disc. The present invention relates to a head supporting device, and by devising the shape of the tip of the arm and the structure for supporting the head, the length of the arm can be truncated without impairing the orientation adjustment function of the head with respect to the recording medium disk. It is an object of the present invention to provide a novel head support device that can make this type of device thinner.

(B. Outline of the Invention) The head supporting device of the present invention supports a pair of upper and lower heads for recording / reproducing to / from a recording medium disk and a lower head of the pair of upper and lower heads, and supports the head in the radial direction of the recording medium disk. A movable carriage and an upper head of the pair of upper and lower heads are supported via a substantially rectangular head supporting piece made of an elastic member, and the carriage integrally moves together with the carriage to move the disk. A head support device comprising: an arm attached to a carriage so as to move in a radial direction, and rotatably attached to the carriage so that an upper head moves up and down with respect to a disk surface. , Which is plate-shaped and is bent in a substantially V shape when viewed from the side, and supports only a substantially U-shaped outer frame portion including three peripheral portions excluding the front edge portion of the head support piece. As described above, a substantially U-shaped cutout recess opening forward is formed at the arm tip, and the distance from the upper head supported by the arm to the arm tip is determined from the lower head supported by the carriage. It should be shorter than the distance to the tip of the carriage, so that the arm length can be reduced without impairing the orientation adjustment function of the head with respect to the recording medium disk, and this type of device can be made thinner. It is the one.

(C. Prior Art) [FIGS. 7 and 8] In a recording / reproducing device for recording and / or reproducing using a recording medium disk, for example, in a magnetic disk driver, the recording surface of the magnetic disk is contacted with. A head supporting device having a magnetic head for recording or reproducing is provided, and the magnetic head is supported by a head supporting member provided so as to be movable in a direction traversing a track of a magnetic disk, that is, a tracking direction. One of the head supporting devices is rotatably supported by a member that is movable in the tracking direction, and a magnetic head is supported at the rotating end thereof, and the magnetic disk is not mounted in the recording / reproducing unit. Between the magnetic disk and the disk mounting portion of the recording / reproducing unit, the magnetic head is moved to a position where it comes into contact with the magnetic disk when the magnetic disk is mounted in the disk mounting unit. Some are equipped with an arm.

FIG. 7 and FIG. 8 show an example a of a conventional head support device having such a structure.

In the figure, b is a moving base, which is substantially L-shaped when viewed from the side, and is supported by a chassis (not shown) so as to be movable in the tracking direction and moved by a moving means. ing. Reference numeral c is an arm supporting portion of the moving base b, and d is a pad attached to the tip of the moving base b. Reference numeral e designates a head arm positioned so as to face the moving base b from above, and one end of the head arm is rotatably supported by the arm supporting portion c of the moving base b and at the position facing the pad d. f is supported.

g is a disk mounting plate rotated by a motor h, i is a magnetic disk cassette in which a magnetic disk k is rotatably housed in a cassette case j, and l and l are head insertion holes formed in the cassette case j. The magnetic disk cassette i is inserted into a cassette carrier (not shown) and then moved downward so that the central portion of the magnetic disk k is mounted on the disk mounting plate g.

In the head arm e, the magnetic disk cassette i is inserted between the magnetic head f and the pad d as shown by the solid line in FIG. 7 while the magnetic disk k is not mounted on the disk mounting plate g. It is held in a standby position with space,
When the magnetic disk k is mounted on the disk mounting plate g, as shown by a two-dot chain line in FIG. 7, the magnetic head f is brought into contact with the magnetic disk k through the head insertion hole 1 of the cassette case j. Be moved.

In addition, m is a head support piece in which each part is integrally formed of a leaf spring material, and has a rectangular outer frame part n and the outer frame part n.
And a first swinging part o having a substantially frame shape located inside the
Second swinging part p positioned inside the swinging part o of the first swinging part o, and the first swinging part o is connected to the left and right side parts of the outer frame part m only in the substantially central part of the left and right side parts thereof. The second oscillating portion p is connected to the first oscillating portion o only at substantially central portions of the front and rear edges thereof, the magnetic head f is attached to the second oscillating portion p, and the outer frame portion n is attached. Is an opening q formed at the tip of the head arm e.
The support pin r fixed to the peripheral portion of the magnetic head f and arranged at the center of the opening q is in contact with the center of the magnetic head f with the head support piece interposed therebetween from above.
When the magnetic head f comes into contact with the magnetic disk k and is relatively pressed from below, the oscillating portions o and p oscillate according to the bias of the pressing force and the magnetic disk k of the magnetic head f.
The orientation for is adjusted automatically.

(D. Problems to be solved by the device) [Figs. 7 and 8]
By the way, recently, recording / reproducing devices are required to be thinner, and in the above-described head supporting device a, the length of the head arm e becomes a big problem in reducing the thickness. ing.

That is, the head arm e stands by at a standby position having a space for inserting the magnetic disk cassette i between the head arm e and the disk mounting plate g until the magnetic disk k is mounted on the disk mounting plate g. Therefore, when the head arm e is in the standby position, the tip end to which the magnetic head f is attached is above the base end supported by the moving base b, and the head arm e is inclined forward. Therefore, the upper limit of the height of the head supporting device a must be at least the height of the tip of the head arm e that is in the standby position, and the upper limit must be lowered. Is extremely difficult unless the length of the head arm e and the height of the disk insertion space required between the head arm e and the head arm g change.

In addition, since the head support piece m that supports the magnetic head f is provided at the tip of the head arm e, the tip of the head arm e needs to extend to a certain distance from the magnetic head f. Therefore, the head arm e
Requires a length including the above distance.

(E. Means for Solving Problems) Therefore, in order to solve the above problems, the head supporting device of the present invention includes a pair of upper and lower heads for recording / reproducing on / from a recording medium disk, and a pair of upper and lower heads. A carriage that supports the lower head of the head and is movably provided in the radial direction of the recording medium disk, and an upper head of the pair of upper and lower heads is supported via a substantially rectangular head support piece made of an elastic member. Mounted on the carriage so as to move integrally with the carriage in the radial direction of the disk as the carriage moves, and rotatably mounted on the carriage so that the upper head moves up and down with respect to the disk surface. And a front supporting edge of the head supporting piece, wherein the arm has a plate shape and is bent in a substantially V shape when viewed from the side. Except for the above, a substantially U-shaped cutout recess opening forward is formed at the arm tip end so as to support only the substantially U-shaped outer frame portion, and from the upper head supported by the arm. The distance to the arm tip is shorter than the distance from the lower head supported by the carriage to the carriage tip.

Therefore, according to the head support device of the present invention, since the tip of the arm and the portion of the head support piece corresponding to the tip are both open, the conventional arm in which both ends of the open portion are connected to each other. Compared with the above, the length of the arm can be reduced by the width of the portion that makes the above connection, and this makes it possible to reduce the distance between the tip of the arm and the disc mounting portion of the recording / reproducing portion when the arm is in the standby position. Since the head supporting device is shortened, the height of the head supporting device can be reduced, and even if the tips of the arm and the head supporting piece are opened in this way, the rocking function of the rocking part of the head supporting piece is impaired. And the automatic adjustment function of the orientation of the head with respect to the recording medium disk is not impaired.

(F. Embodiment) [FIGS. 1 to 6] The details of the head supporting device of the present invention will be described below with reference to the illustrated embodiment.

In the illustrated embodiment, the head supporting device of the present invention is applied to the head supporting device of the magnetic disk driver 1.

First, an example of a magnetic disk cassette used in the magnetic disk driver 1 will be described, and then each part of the magnetic disk driver will be described.

(A. Magnetic disk cassette) [FIGS. 1 and 2] 2 is a magnetic disk cassette.

3 is a cassette case of the magnetic disk cassette 2,
When viewed from the thickness direction, it is in the shape of a thin box having a substantially square shape, and the head insertion holes 5 and 5'are formed at positions near one side edge of the two wall portions 4 and 4'which face each other in the thickness direction. In addition, a circular opening 6 is formed in the substantially central portion of one wall portion 4 ', and the head insertion holes 5 and 5'indicate the magnetic disk cassette 2 in the cassette carrier of the magnetic disk driver 1 which will be described later. Shutter 7 while not inserted
(See FIG. 2).

A magnetic disk 8 is rotatably housed in the cassette case 3, and has a magnetic sheet 9 having a circular shape and magnetic layers formed on both surfaces thereof, and a center core 10 fixed to the center of the magnetic sheet 9. And the engaging holes 11 and 11 ′ are formed at the center of the center core 10 and the position deviated from the center,
The center core 10 is located so as to face the outside through the opening 6 of the cassette case 3.

(B. Outer casing, mechanical chassis) [FIGS. 1 and 2] 12 is an outer casing of the magnetic disk driver 1, and is in the front-rear direction (the leftward direction in FIG. 2 is the front side, and the rightward direction). The direction is the rear side, the upward direction in the figure is the left side, and the downward direction is the right side. In the following description, the direction is based on this direction. On the upper part of the front panel 13, a cassette insertion / ejection opening 14 which is long in the left-right direction is formed.

Reference numeral 15 is a mechanical chassis arranged in a lower portion inside the outer casing 12, and has a rectangular front portion that is long in the left-right direction when viewed from above.
15a and a rear portion 15b having a substantially L shape, and a recess 16 is formed in the central portion of the rear portion 15b in the left-right direction.

(C. Recording / reproducing unit) [FIGS. 1 to 6] Reference numeral 17 is a recording / reproducing unit for recording and / or reproducing on the magnetic disk 8, and a disk drive mechanism to which the magnetic disk 8 is detachably mounted, A magnetic disk cassette is detachably inserted, and a head support device including a cassette carrier for mounting the magnetic disk 8 of the inserted magnetic disk cassette in the disk drive mechanism, a moving base supporting a recording / reproducing head, a head arm, and the like. And a moving means for moving the head supporting device.

(C-1. Disk drive mechanism, cassette carrier) [First
FIG. 2, FIG. 2] 18 is a disk drive motor provided on the lower surface of the front part 15a of the mechanical chassis 15. The upper part of the rotary shaft 19 of the disk drive motor is projected upward from the mechanical chassis 15 and the upper end of the projected part is shown. A central portion of the disc mounting plate 20 is fixed at a position near the disc mounting plate 20, and a drive pin 21 is provided so as to project from a position deviated from the center of the disc mounting plate 20.

Reference numeral 22 denotes a cassette carrier into which the magnetic disk cassette 2 is detachably inserted, and has a plate shape in which left and right end portions are formed with substantially U-shaped cassette support portions whose open ends face each other when viewed from the front-rear direction. It is located above the front part 15a of the mechanical chassis 15 and is movably supported in the vertical direction by cassette carrier support walls (not shown) arranged on both left and right sides of the mechanical chassis 15, and is constantly lowered by elastic means (not shown). Has been urged to move toward. The cassette carrier 22 has an eject position at the same height as the cassette insertion / removal port 14, that is, the magnetic disk, in a state where the magnetic disk cassette 2 is not inserted to a predetermined insertion completion position as shown by a solid line in FIG. The cassette 2 is held at a position where it is inserted and taken out, and the magnetic disk cassette 2 is inserted to a predetermined insertion position (the state shown by the solid line in FIG. 1 is the state at the time when this insertion is completed). Then, the shutter 7 is moved to a position where the head insertion holes 5 and 5'are opened, and is also moved to a mounting position shown by a chain double-dashed line in FIG. 1, and the center core 10 of the magnetic disk 8 is moved to the disk. It is attached to the mounting plate 20 and the center core
The disk drive motor 18 is inserted into the engaging holes 11 and 11 'formed in
The upper end portion 19a of the rotary shaft 19 of the disk and the drive pin 21 are engaged with each other, whereby the magnetic disk 8 is mounted on the disk mounting plate 20.
It will be in a state of being integrally rotated with.

(C-2. Head support device) [Figs. 1 to 6] 23 is a head support device, which is a movable base movably supported by the mechanical chassis 15 and is pivoted substantially vertically in the movable base. It comprises a head arm supported freely, a recording / reproducing magnetic head, a head supporting piece attached to the movable base and the head arm for supporting the magnetic head.

(C-2-a. Moving base) [FIGS. 1 to 3] Reference numeral 24 is a moving base, and each part thereof is integrally formed of synthetic resin.

Reference numeral 25 denotes a main portion of the moving base 24, which has a plate shape that is long and relatively thick in the front-rear direction, and has its front end portion formed to be narrower than the remaining portion, and from the front and rear end portions on the left side surface. Projecting pieces 26, 26 are provided in a protruding manner, and insertion holes 26a, 26a are coaxially formed in the projecting pieces 26, 26 so that the axial direction extends along the front-rear direction. In addition, on the upper surface of the main portion 25, a concave portion 27 having a substantially rectangular shape that is long in the front-rear direction when viewed from above is formed in a portion deviated to the right side edge of the portion excluding portions near the front and rear ends thereof, and a portion near the front end. A recess 28 continuous with the recess 27 is formed by a groove having a substantially square shape when viewed from above and having a narrow width, and the upper end 28a of the recess 28 is slightly larger than the remaining portion. A short support pin 29 is provided so as to project from a substantially central portion of the bottom surface of the recess 28.

A portion of the upper surface of the main portion 25 on the rear side from the recess 27 is higher than the remaining portion, and a higher arm support portion 30 is formed at the rear end portion of this portion, and the arm support portion 30 is formed. A spring arranging hole 31 penetrating in the height direction is formed in a portion biased toward the portion 30.

Incidentally, 32 is a spring hook portion located at the lower end portion of the spring arrangement hole 31, 33 is an eave portion protruding from the upper end portion of the front side surface of the spring arrangement hole 31, and a pressure contact spring 34 is provided on the lower surface of the eave portion 33. It is fixed, and the pressed pin 35 is provided so as to project from the right end surface of the eaves portion 33 obliquely to the upper right.

(C-2-b. Head Arm) [FIGS. 1 to 5] 36 is a head arm.

The head arm 36 has a substantially rectangular plate shape slightly shorter than the length of the moving base 24 in the front-rear direction, and is bent in a substantially V-shape when viewed from the side. Is projected.

A portion of the head arm 36 excluding the left and right end portions of the tip surface 36a is formed to have a concave arc shape projecting rearward when viewed in the thickness direction. Has a U-shaped cutout recess 38 that is open toward the front, and the lower end 38a of the cutout recess 38 is slightly larger than the remaining portion. Reference numeral 39 is a seat arrangement recess formed in the rear end surface of the cutout recess 38 at substantially the center thereof.

Reference numeral 40 denotes a short support pin vertically extending from a central portion in the left-right direction of a portion of the upper surface of the cutout recess 38 near the front end.

Reference numeral 41 denotes a hinge plate protruding from the rear end surface of the head arm 36, which is made of a leaf spring material.

The head arm 36 is positioned so as to face the main portion 25 of the moving base 24 from above, and the hinge plate 41 is
The rear end portion of the head arm 36 is fixed to the upper surface of the arm support portion 30 of the moving base 24 so that the rear end portion is supported by the moving base 24 so as to be rotatable in a substantially vertical direction, and is provided on the lower surface of the rear end portion of the head arm 36 so as to project. Tension spring 43 stretched between the spring hook 42 and the spring hook 32 formed at the rear of the moving base 24.
(See FIG. 1), the downward turning force is constantly urged.

While the magnetic disk 8 is not mounted on the disk mounting plate 20, the head arm 36 is moved by the cassette carrier 22 against the tensile force of the tension spring 43 to the standby position shown by the solid line in FIG. It is held and when the magnetic disk 8 is mounted on the disk mounting plate 20, the cassette carrier is held.
It is moved to the contact position shown by the two-dot chain line in FIG.

(C-2-c. Head support piece of head arm and magnetic head) [FIGS. 1 to 6] 44 is a head support piece attached to the head arm 36,
Each part is integrally formed of a material having spring elasticity, for example, a leaf spring material, and its outer shape is a substantially rectangular shape that is long in the left-right direction.

Reference numeral 45 denotes a kerf formed in an approximately U-shape with a gap between the head support piece 44 and three peripheral edges except the front edge.
The part of the 45 extending in the front-rear direction is interrupted at positions 45a, 45a on the front side of the intermediate part thereof, and the U-shaped part 46 on the outer side from the cut groove 45 is attached to the head arm 36. It is the outer frame.

Reference numeral 47 denotes a kerf formed on the front edge of the head support piece 44 and the inside of the kerf 45 so as to form a substantially rectangular contour with a gap between them. The portion extending in the direction is interrupted at positions 47a, 47a substantially in the middle thereof,
A substantially frame-shaped portion 48 between the inner cut groove 47 and the cut groove 47 serves as a first swing portion, and the inner cut groove 47 is formed.
A substantially rectangular portion 49 on the inside serves as the second swinging portion.

Therefore, since the first swinging portion 48 is connected to the outer frame portion 46 only through substantially central portions of the left and right side portions thereof via the cutout portions 45a, 45a of the cut groove 45, the front and rear ends thereof have a plate thickness. The second swinging portion 49 is movably supported by the outer frame portion 46 so as to be displaced in the direction, and the second swinging portion 49 has the cutout portions 47a, 47a of the cut groove 47 only at substantially central portions of both front and rear edges thereof. Since it is connected to the first swinging portion 48 via, the left and right ends thereof are swingably supported by the first swinging portion 48 so as to be displaced in the plate thickness direction.

The second swinging portion 49 is swingably supported by the outer frame portion 46 so that the front, rear, left, and right are displaced in the vertical direction. 1 swinging part
A point at which a line passing through the connecting portions 45a and 45a between the 48 and the outer frame portion 46 and a line passing through the connecting portions 47a and 47a between the second swinging portion 49 and the first swinging portion 48 intersect. A magnetic head 50 is attached to a portion centered on.

In addition, 50a is a head holder, and 50b is the head holder 50a.
Is a head chip supported by.

The head support piece 44 has its outer frame portion 46 fixed to the lower end portion 38a of the cutout recess 38 formed in the head arm 36 by a fixing means such as adhesion, and the outer frame portion 46 is opened in a U shape. The portion is aligned with the U-shaped opening of the cutout recess 38 and the head chip 50b of the magnetic head 50 is arranged so as to face downward.

Then, when the head support piece 44 is attached to the head arm 36 in this way, the support pin 40 located at the rotating end of the head arm 36 of the magnetic head 50 and provided in the cutout recess 38 is formed. Is brought into contact with the central portion of the magnetic head 50 from above with the head support piece 44 interposed therebetween, whereby the magnetic head
When 50 is pressed from below, 50 can be swung in the direction corresponding to the deviation of the pressing force with its central portion as the swing center point.

The head chip 50b of the magnetic head 50 is connected to a circuit board 52 (see FIG. 1) via a flexible printed circuit board 51.

(C-2-d. Head support piece and magnetic head of moving base) [FIGS. 1 to 3] 53 is a head supporting piece fixed to the moving base 24, and has a substantially rectangular outer frame portion 54. And a first oscillating portion 55 and a second oscillating portion 56 having the same oscillating function as the oscillating portions 48 and 49 of the head support piece 44 are integrally formed of a leaf spring material, and The magnetic head 57 is attached to the upper surface of the second swinging portion 56, and the outer frame portion 54 of the head supporting piece 53 is formed in the recess 28 formed at the front end portion of the upper surface of the main portion 25 of the moving base 24. It is fixed to the upper end 28a of the.

The magnetic head 57 is located on the upper surface of the front end portion of the main portion 25 of the moving base 24, and the head supporting piece is provided at the center portion thereof.
When the support pin 29 is contacted from below with the pinch 53 in between, and thereby pressed from above, the support pin 29 can swing about the central portion in the direction corresponding to the bias of the pressing force. .

The magnetic head 57 is a flexible printed circuit board 58.
The magnetic head 50 supported by the head arm 36 faces the magnetic head 57 of the moving base 24 from directly above when the head arm 36 reaches the contact position. Is located.

(C-3. Head support device moving means) [FIGS. 1 and 2] 59 and 59 are support members fixed to the left side of the recess 16 formed in the rear portion 15b of the mechanical chassis 15, A guide shaft 60 is supported between the support members 59 so as to extend in the front-rear direction.

In the head support device 23, the guide shaft 60 is slidably inserted into the through holes 26a, 26a of the projecting pieces 26, 26 projecting from the moving base 24, whereby the mechanical chassis is formed.
It is supported by 15 so as to be movable in the front-back direction.

The head support device 23 has its lower portion located in the recess 16 of the mechanical chassis 15, and the central portions of the magnetic heads 50 and 57 pass through the central portion of the disk mounting plate 20 in a straight line extending in the front-rear direction. Therefore, when the head support device 23 moves in the front-back direction, the magnetic head 50 and
57 moves in the tracking direction with respect to the magnetic disk 8 mounted on the disk mounting plate 20.

Reference numeral 61 denotes a sub-chassis, in which the lead screw 62 is rotatably supported on the wall portions 61a and 61b projecting upward from both front and rear ends thereof, and the motor 63 is supported on the rear wall portion 61b. The lead screw 62 is rotated by the motor 63.

The sub chassis 61 is fixed to the right side of the rear portion 15b of the mechanical chassis 15 with the lead screw 62 extending in the front-rear direction, and the pressed pin 35 and the right end of the press contact spring 34 provided on the moving base 24. Lead screw 62
Is positioned so that it is sandwiched between the upper and lower sides, and
35 is engaged with the spiral groove 62a of the lead screw 62.

Then, when the lead screw 62 rotates, the pressed pin 35 is pressed in the front-rear direction, whereby the head support device 23 is moved in the front-rear direction.

(D. Recording or reproduction) 64 is an arm push-up portion (see FIG. 2) provided so as to project rearward from the rear end portion of the cassette carrier 22, and the head arm 36 is at the eject position of the cassette carrier 22. When the arm piece 37 comes into contact with the arm push-up portion 64 from above in the state where the magnetic head 50 is in the standby position against the tensile force of the tension spring 43, that is, the magnetic head 50 is connected to the magnetic head 57 of the moving base 24. In this state, the head arm 36 is tilted forward and upward.

Therefore, when the cassette carrier 22 is moved to the mounting position, the magnetic disk 8 is mounted on the disk mounting plate 20 and the magnetic head 57 of the moving base 24 is relatively contacted with the lower surface of the magnetic disk 8. At the same time, the head arm 36 is moved downward by the tensile force of the tension spring 43, and the magnetic head 50 is brought into contact with the upper surface of the magnetic disk 8. At this time,
When the magnetic heads 50 and 57 are relatively pressed by the magnetic disk 8, the magnetic heads 50 and 57 oscillate according to the bias of the pressing force, and the orientation is automatically adjusted so that the orientation with respect to the magnetic disk 8 becomes correct.

When the operation of recording or reproducing is started, the magnetic disk 8 is rotated and the head supporting device 23 is moved to a position where the magnetic head 50 or 57 of the magnetic disk 8 corresponds to a predetermined track of the magnetic disk 8, As a result, recording or reproduction is performed on the magnetic disk 8.

(E. Height of Outer Casing) As described above, the head arm 36 is in a forward inclined posture when the head arm 36 is in the standby position. Therefore, the top plate 12a of the outer casing 12 is at least in the standby position. It is necessary to be at a position higher than the tip of the head arm 36 that is coming, but the tip of this head arm 36 is cut out in a substantially U-shape open to the tip, and furthermore, the magnetic head 50 is supported. Since the outer frame portion 46 of the head supporting piece 44 has substantially the same shape as the cutout portion 38 and the open portion of the outer frame portion 46 is positioned to coincide with the open portion of the cutout portion 38, The conventional head arm e in which both ends of these open portions are connected
Compared with, the length is the width of the connected portion, that is,
The length of the head arm is reduced by the length along the longitudinal direction, and the height of the head support device is also reduced accordingly.

Therefore, the height of the outer casing 12 can be reduced correspondingly,
The magnetic disk driver 1 can be made thin.

(G. Effect of the Invention) As is clear from the above description, the head supporting device of the present invention is composed of a pair of upper and lower heads for recording / reproducing to / from a recording medium disk, and a lower head of the pair of upper and lower heads. And a carriage movably provided in the radial direction of the recording medium disk and an upper head of the pair of upper and lower heads via a substantially rectangular head support piece made of an elastic member to move the carriage. And an arm attached to the carriage so as to move integrally with the carriage in the radial direction of the disc, and rotatably attached to the carriage so that the upper head moves up and down with respect to the disc surface. In the head supporting device, the arm is plate-shaped and is bent into a substantially V shape when viewed from the side, and the front supporting portion of the head supporting piece is excluded.
The front end of the arm is formed with a substantially U-shaped notch recess so as to support only the substantially U-shaped outer frame portion composed of two peripheral portions, and the upper head supported by the arm to the arm tip. Is shorter than the distance from the lower head supported by the carriage to the tip of the carriage.

Therefore, according to the head support device of the present invention, both the tip of the arm and the portion corresponding to the tip of the head support piece are opened, so that both ends of the opened portion are connected to the conventional arm. By comparison, the length of the arm can be cut off by the width of the part that makes the above connection, and by this,
Since the distance between the tip of the arm and the disk mounting portion of the recording / reproducing portion when the arm is in the standby position is short, the height of the head supporting device can be reduced, and the arm and head supporting device can be made smaller. Even if the tip end of the piece is opened in this way, the swing function of the swing portion of the head support piece is not impaired at all, and the automatic adjustment function of the orientation of the head with respect to the recording medium disk is not impaired.

[Brief description of drawings]

FIGS. 1 to 6 show an embodiment in which the head supporting device of the present invention is applied to a head supporting device in a magnetic disk driver, and FIG. 1 is an enlarged sectional view taken along the line II of FIG. FIG. 2 is a plan view of an essential part of a magnetic disk driver shown with a magnetic disk cassette mounted, FIG. 3 is an enlarged perspective view of a head supporting device, and FIG. 4 is a head arm, a head supporting piece, and a magnetic head. FIG. 5 is an enlarged perspective view showing the head arm separately, FIG. 5 is an enlarged bottom view of the head arm, and FIG.
FIG. 7 is an enlarged plan view of a head support piece, FIGS. 7 and 8 show an example of a conventional head support device, FIG. 7 is a side view with a part cut away, and FIG. 8 is a head arm. FIG. Explanation of symbols 8 ... Recording medium disk, 23 ... Head support device, 24 ...
… Carriage, 36 …… Arms, 38 …… Notched recesses, 44 ……
Head support piece, 46 ... Outer frame part, 50 ... Upper head, 57 ...
… Lower head

Claims (1)

[Scope of utility model registration request] 1. A pair of upper and lower heads for recording / reproducing on / from a recording medium disc, and a carriage that supports the lower heads of the pair of upper and lower heads and is movably provided in the radial direction of the recording medium disc. The upper head of the pair of upper and lower heads is supported via a substantially rectangular head support piece made of an elastic member, and the carriage is configured to move integrally with the carriage in the radial direction of the disc as the carriage moves. A head support device comprising: an arm attached to a carriage so that the upper head moves up and down with respect to a disk surface, and the arm is plate-shaped and laterally disposed. As seen, the arm tip portion is bent so as to have a substantially V-shape, and supports only the substantially U-shaped outer frame portion including the three peripheral portions excluding the front edge portion of the head support piece. A substantially U-shaped cutout recess opening forward is formed, and the distance from the upper head supported by the arm to the arm tip is shorter than the distance from the lower head supported by the carriage to the carriage tip. Head support device characterized in that