JP2570235Y2 - Disk unit - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk device for recording or reproducing information on or from a disk, and more particularly to a structure of a head loading / unloading mechanism in the disk device.

[0002]

2. Description of the Related Art The above-mentioned disk device is a device for recording or reproducing information on or from a disk-shaped recording medium such as a magnetic disk or a laser disk. The disk is rotated by driving a motor, and recording or reproduction is performed while the head is moved in contact with or close to the disk. In this case, the head is mounted on a carriage and moved (seeked) along a radial direction of the disk by a motor.

In the above-mentioned disk device, an insertion / ejection means for mounting / discharging a disk cassette on a base for supporting each constituent member, a disk rotation driving means for rotating a disk by a motor, and a head along a radial direction of the disk. Head seek means for moving to an arbitrary track position, head load means for loading and unloading a head to and from a disk, and the like are provided. Further, a control circuit for controlling the entire disk device, a connector for power supply, and the like are provided, and the control circuit is connected to a host device or the like via an interface.

[0004] Such a disk device is used as an external storage device of an electronic device such as a personal computer or a word processor, and may be configured as an independent device, but is generally incorporated in the main body of the electronic device in many cases. . Also, with the miniaturization and portableness of electronic devices, there is a strong demand for smaller and lighter and thinner disk devices.

[0005] Such disk devices often adopt a structure in which the loading and unloading operations of the head onto and from the disk are linked to a cassette guide.
In this case, the cassette guide moves while being guided by a guide groove formed in the side wall of the base.

[0006]

However, in such a disk drive, the shape of the cassette guide plays an important role in smoothly moving the cassette guide along the side wall of the base. There is a problem that the head cannot be completely unloaded depending on the manufacturing accuracy of the cassette guide.

Further, the position of the unloading depends on the accuracy of each part and the accuracy of assembly, and depending on the accuracy, the position of the head is lower than a predetermined position.
There is a problem that the recording medium comes into contact with the head when the recording medium is inserted.

The present invention has been made in view of such a technical problem, and an object of the present invention is to make it possible to stably move a head to an unloading position with a simple configuration, It is an object of the present invention to provide a disk device that can make the distance between two heads constant at a load position regardless of the position of the head in the disk radial direction, and can reduce the thickness of the device.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems and to achieve the above-mentioned object, the present invention provides a method for rotating a disk-shaped recording medium and moving a head in a predetermined direction to store information on the recording medium. A disk device that records or reproduces, holds a first head,
A head carriage movable in the radial direction of the recording medium, a head arm supported by the head carriage and holding a second head facing the first head, and recording information on the recording medium Or renewable first
And a moving means for moving the second head at an impossible second position, and the head carriage is arranged such that the longitudinal direction of the head carriage and the moving direction of the head carriage are substantially the same. Placed vertically
The moving means has a support portion for supporting the head arm in the moving direction of the head carriage when the second head is located at the second position, and an elastic portion is provided on a part of the support portion. And a supporting portion holding member having the same.

Another invention is a disk device for recording or reproducing information on or from a recording medium by rotating a disk-shaped recording medium and moving a head in a predetermined direction. A head carriage that holds and is movable in the radial direction of the recording medium; a head arm that is supported by the head carriage and holds a second head facing the first head; Moving means for moving the second head to a first position at which information can be recorded or reproduced and a second position at which information cannot be recorded; a longitudinal direction of the head carriage; The moving direction is arranged so as to be substantially perpendicular to the moving direction, and the moving means moves the head arm to the head cap when the second head is located at the second position. Tsu has a support portion for supporting over the moving direction of the di-, the support portion has a plurality of shaft portions having different diameters, the axial portion of the plurality consists coupled axially eccentrically.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the same reference numerals indicate the same or corresponding parts. 1 to 4
FIG. 1 is a diagram showing an embodiment of a disk drive to which the present invention is applied, FIG. 1 is a plan view showing an internal configuration at the time of unloading with a cover omitted, and FIG. 2 is a diagram showing an internal configuration at the time of loading of FIG. FIG. 3 is a plan view, FIG. 3 is a front view taken along line 3-3 in FIG.
FIG. 4 is a rear view as viewed from line 4-4 in FIG. 2. 5a, 5
b is a main part enlarged view.

In a box-shaped base 10 having an open top,
As shown in FIGS. 1 and 2, each component is stored. The base 10 is formed of a thin metal body such as aluminum, for example, and its upper surface is provided with a cover (not shown) made of a thin plate of nonmagnetic material such as aluminum for magnetic shielding and dust prevention. Covered. As shown in FIG. 3, a front panel 13 having a cassette insertion opening 12 for inserting and ejecting a disk cassette 11 is attached to a front surface of the base 10. At the left end of the front panel 13, a push button (eject button) 14 which is operated when the loaded disk cassette 11 is ejected is provided.

1 and 2, a base 10 has a disk cassette 11 inserted, ejected, and loaded.
A cassette guide 15 for guiding unloading is held movably up and down and back and forth. The cassette guide 15 is provided for the disc cassette 1 inserted from the front.
1 has a cross-sectional shape for guiding and holding, and in the illustrated example, a notch 16
Is provided. Further, the cassette guide 15 is mounted at a position shifted to the right side (rightward shift position) with respect to the base 10, and a space for disposing other components is formed on the left side of the base 10. ing.

In FIG. 1 and FIG. 2, the area of the notch 16 of the cassette guide 15 is
1 is provided with a head seek mechanism 18 having a head 17 for recording or reproducing information on or from a disk (information medium) in the disk drive 1. This head seek mechanism 18
Is a mechanism for moving (seeking) the head 17 to an arbitrary track position along the radial direction of the disk.

A disk (magnetic disk, etc.) as an information medium (media) housed in the disk cassette 11 is opened from a head receiving opening by opening a slidable shutter 19 provided in the disk cassette. It can be accessed from outside such as loading the head 17.

In FIGS. 1 and 2, a shutter shaft 21 and a latch lever 22 which can swing about the shaft above the cassette guide 15 are provided on a vertical shaft 20 provided at the right rear portion of the cassette guide 15. It is pivoted. The shutter lever 21 is connected to the disc cassette 1.
The shutter 19 in the head receiving opening of the disk cassette 11 is opened and closed in conjunction with the insertion of the disk cassette 1. A pin 23 that can be abutted on the edge is provided. The shutter lever 21 is urged in the counterclockwise (leftward) direction in the figure by a spring 25 stretched between the shutter lever 21 and the cassette guide 15. Further, a groove 26 having a predetermined length is formed on the upper surface of the cassette guide 15 along the movement locus of the pin 23 so as to allow the pin 23 to move.

1 and 2, the latch lever 22 is urged by a latch spring 27 in a counterclockwise (left-handed) direction in the figure, and in an unloaded state, as shown in FIG. The roller 29 provided at one end of the lever 22 is latched by a stopper 28 formed on the base 10 to be in a latched state. The other end of the latch lever 22 is provided with a pin 30 with which the leading end of the disc cassette 11 to be inserted can abut. In this manner, the space opposite to the notch 16 of the cassette guide 15, that is, the side where the head seek mechanism 18 and a cassette loading mechanism 33 described below are disposed (a space is formed by moving the cassette guide 15 and the disk cassette 11 together). On the other side of
A latch mechanism 22 is provided.

FIGS. 6A and 6B are views showing parts to be mounted on the bottom surface of the base 10 by removing the cassette loading mechanism and the head seek mechanism, and FIG. 6A is a plan view.
(B) is a front view as seen from line BB in (a), and (c) is a side view as seen from line CC in (a). In FIG. 6, a disk-shaped flat motor 31 for driving a disk is mounted substantially at the center of the bottom surface of the base 10. The motor 31 has a central hole (not shown) of the disk cassette 11 and A center shaft 81 to be fitted, a drive pin 82 to be engaged with a drive hole (not shown) provided near the center hole of the disk cassette 11, and a magnet 83 for holding a disk hub by suction are provided. I have.
A positioning pin 84 for positioning the disc cassette 11 in a loading state is provided behind the motor 31, and a part of the base 10 is cut and raised near the cassette insertion slot 12 (FIG. 3). A positioning surface 85 is provided. A circuit board 32 for controlling the disk device is joined to the periphery of the motor 31.

1 and 2, in a space formed on the left side of the cassette guide 15 in the base 10, a cassette loading mechanism 33 for moving the cassette guide 15 to a load position and an unload position.
Are arranged. An operating lever 34 extending across the upper side of the cassette guide 15 and pivotally supported at both ends by the base 10 is mounted on the base 10. Button lever 3 of the loading mechanism 33
6 is constantly urged in the direction of the insertion opening 12 by the return spring 35 and can move rearward against the return spring 35 by pressing the eject button 14. The swing position of the operating lever 34 is regulated by the button lever 36, and the cassette guide 1 is
5 for driving the load 5 to the load position and the unload position.

FIGS. 7 to 10 are partial side views showing the unloading state and the loading state of the cassette loading mechanism 33. FIG. 7 shows the state of the button lever 36 at the time of unloading, and FIG. FIG. 9 shows the state of the button lever 36 during loading, and FIG. 10 shows the state of the operating lever 34 during loading.
And the state of the cassette guide 15. The button lever 36 is slidably supported in the front-rear direction with respect to the base 10 by a sliding guide portion including a pin and a long hole, and is constantly urged leftward (forward) in the figure by a return spring 35. ing. The operation lever 34 is pivotally supported at both ends thereof so as to be able to swing about a fulcrum 37 provided on the base 10. Therefore, a notch 38 formed in the button lever 36 and a pin 39 provided on one side of the operation lever 34 are engaged.

The cam groove 4 is provided on both sides of the operating lever 34.
0 is formed, and stepped holding portions 41 are provided on both sides of the base 10. On the other hand, the cassette guide 15
The center pin 42 slidably engaged with the cam groove 40 of the operating lever 34 and the holding portion 41 of the base 10
The roller portion 43 is provided in contact with the roller portion 43. Since the cassette guide 15 has a cut-out shape in the left half portion as shown in FIGS. 1 and 2, the holding portion 41 and the roller portion 43 have a total of one portion on the left side and two portions on the right and left sides. It is provided in three places.

Next, the operation of each part when loading and unloading the disk cassette 11 will be described with reference to FIGS. Cassette insertion slot 1
When the disk cassette 11 is inserted from the disk cassette 2 (FIG. 3), the leading end of the disk cassette 11
1 and 2, the shutter lever 21 rotates clockwise (clockwise) in FIG. At this time, the pin 23 (FIGS. 1 and 2) of the shutter lever 21 abuts on the edge of the shutter 19 of the disk cassette 11, and the shutter 19 is returned by a spring ( (Not shown), the head receiving port is opened, and the head 17 can access the disk (media).

Next, when the tip of the disk cassette 11 contacts the pin 30 of the latch lever 22 (FIGS. 1 and 2), and further presses the disk cassette 11 (in the insertion direction), the latch lever 22 is turned on the clock (see FIG. 1). The roller 29 of the latch lever 22 comes off the stopper 28 of the base 10. By releasing the latch, the cassette guide 15 restrained by the roller 29 can be moved rearward (to the right in FIG. 8) of the apparatus. The position of the disc cassette 11 in the forward direction in the cassette guide 15 is regulated by the pin 23, the leading end of which contacts the rear end of the groove 26 (FIG. 2).

When the disc cassette 11 is further pushed, the cassette guide 15 also moves to the rear of the apparatus. Therefore, the center pin 42 of the cassette guide 15 (FIG. 8,
10) horizontally moves the cam groove 40 of the operating lever 34 rightward (backward of the apparatus) in the figure, and the urging force of the return spring 35 acts on the pin 39 of the operating lever 34 via the button lever 36. Then, the operating lever 34 rotates, and the operating lever 34 rotates clockwise (clockwise) from the position shown in FIG. At the same time, the roller portions 43 (three places) of the cassette guide 15 also move rearward along the horizontal portion 41b of the holding portion 41. Since the pin 39 moves to the left in the drawing by the rotation of the operation lever 34, the button lever 36 also moves in conjunction with it.

When the disc cassette 11 is further pushed, the roller portion 43 of the cassette guide 15 descends so as to move along the lower vertical portion 41c of the stepped holding portion 41, and the cassette guide 15 is moved to the position shown in FIG. Cassette loading state (a state in which the disk cassette 11 is at the loading position).

In the loading state where the cassette guide 15 is lowered, the cassette guide 15 is brought into contact with the roller portion 43 of the cassette guide 15 and the lower holding surface (vertical surface) 41c of the holding portion 41 of the base 10. The front and rear position of is regulated. In this loading state, the disc cassette 11 is mounted on the positioning pins 8.
4 and the positioning surface 85, the cassette guide 15 is positioned in the mounted state.
4 is urged downward by the downward urging force. Therefore, the loading position of the cassette guide 15 is regulated by pressing and positioning the upper surface of the disk cassette 11 by the plurality of disk cassette pressing projections 86 (FIGS. 1 and 2) provided on the cassette guide 15. Is done. Then, when the cassette guide 15 is at the load position, the disk in the disk cassette 11 (specifically,
The hub (the hub portion) is magnetically attracted onto the rotor of the disk drive motor 31 (FIG. 6) and engages with the center shaft 81 and the drive pin 82 on the rotor, thereby positioning the disk (media) (high). Direction, rotation direction). That is, the disc is set to a loading state in which information can be recorded and reproduced on the disc.

In the loading state, the center pin 42 of the cassette guide 15 is
0 is urged obliquely downward and to the left in FIG. 10 by the top end side 40 a of the cassette guide 15, whereby the roller portion 43 of the cassette guide 15 is
c regulates the front and rear position, and the cassette guide 1
5 holds the disk cassette 11 in a stable state with respect to the base 10.

When ejecting the disc cassette 11 set in the disc device, the eject button 14
(FIGS. 3 and 9), the button lever 36 is moved rearward against the return spring 35. When the button lever 36 moves rearward, first, the engagement of the notch 38 of the button lever and the pin 39 of the operation lever 34 causes the operation lever 34 to rotate counterclockwise from the position shown in FIG. (Rotation) direction. Next, the center pin 42 is lifted by the cam groove 40, and the cassette guide 15 moves upward. When the eject button 14 is further pressed, the roller portion 43 is disengaged from the lower holding portion (vertical portion) 41c due to the rise of the cassette guide 15, and the cassette guide 1
Reference numeral 5 denotes a state in which the apparatus can be moved forward (to the left in FIG. 10).

When the eject button 14 is further depressed, the shutter lever 21 and the latch lever 22 are vigorously rotated counterclockwise (counterclockwise) by the urging forces of the return springs 25 and 27 (FIGS. 1 and 2). Then, the disc cassette 11 is ejected forward (ejected), and the cassette guide 15 is moved forward. At that time, an elastic member for urging the cassette guide 15 forward may be provided to assist the smooth movement of the cassette guide 15. In this embodiment, the operating lever 34 and the cassette guide 1
5, a spring member 87 (FIGS. 1 and 2) is attached. Further, the shutter spring 25 (FIGS. 1 and 2)
May be used. In that case, one end of the shutter spring 25 is attached to a fixed side of the base 10 or the like or to the operation lever 34. When the shutter lever 21 moves in the groove 26 and returns, the pin 23 of the shutter lever 21 comes into contact with the front end of the groove 26 to apply a return force to the cassette guide 15. Thus, first, the cassette guide 15 is returned to the initial position in FIG. So, eject button 1
4 is stopped, the urging force of the return spring 35 (FIGS. 7 and 9) causes the button lever 36 and the operating lever 34 to move.
Is returned to the initial position (unload position) shown in FIGS.

As shown in FIGS. 1 and 2, a head seek mechanism 18 is provided in the area of the notch 16 of the cassette guide 15. FIG. 12 is a line 10-10 in FIG.
FIG. 5 is a vertical sectional view of a head seek mechanism 18 along the line.
Next, the head seek mechanism will be described with reference to these drawings. In the illustrated example, a notch 16 extending over a substantially quarter area is provided on the left side of the rear half of the cassette guide 15.
However, in some cases, a notch corresponding to this may be provided on the right side of the rear half. In that case, a mechanism corresponding to the head seek mechanism 18 is also provided in the area of the notch on the right side. Will be.

In FIG. 1 and FIG.
6 or the like, that is, near the side edge in the space formed by moving the cassette guide 15 to one side (the right side in the illustrated example) (the left side in the illustrated example). The cassette loading mechanism 33 and the head seek mechanism 18 are arranged along the side edge of the disk cassette 11 in the insertion direction of the disk cassette 11.

The head seek mechanism 18 includes a head driving motor 51 fixed to the rear wall of the base 10, a driving shaft 53 composed of a lead screw rotated by the motor 51 through a gear train 52, A head carriage 54 which engages with a lead groove of a shaft (lead screw) 53 and which can reciprocate by forward and reverse rotation of the drive shaft 53; and a guide bar 55 which fits with the head carriage 54 and guides the head carriage 54. A lower head 17B mounted on the distal end of the head carriage 54, a head arm 57 movably mounted on the head carriage 54 via a leaf spring 56, and a distal end of the head arm 57. And a head for urging the head arm 57 downward (toward the head load position). And a spring 58 for over de.

The output of the motor 51 may be transmitted to the drive shaft 53 by a belt or the like. At this time, as shown in FIG. 13, a spring 101 is interposed between a pulley 100 fixed to an output shaft 51a of the motor 51 so as to eliminate backlash in the axial direction between the motor 51 and the output shaft 51a. To be configured. By adopting such a configuration, it is possible to prevent the backlash in the axial direction and the vibration due to the step driving of the step motor 51 and the noise due to the vibration. Further, since the position of the pulley 101 is stabilized by the pressing force of the spring 101, the backlash in the axial direction and the forward and reverse rotation of the step motor 51 cause the pulley 1 to rotate.
The position does not change back and forth in the axial direction of 00. Therefore, the engagement state of the belt with the pulley 100 is stabilized, and the belt does not come off the pulley 100. The same applies when the belt transmission mechanism is replaced with a gear transmission mechanism.

On the side of the notch 16 of the cassette guide 15, there is a bar 61 extending below the head arm 57. As shown in FIGS. 11 (a) and 11 (b), the bar 61 has an end. The shaft portion 61a has a groove 61c for engaging a tool such as a screwdriver with the shaft portion, and a shaft portion 61b eccentric by a predetermined amount with respect to the shaft portion 61a. A bar 61 for a head lift (unloading of the head) is attached so that a holder 90 is attached to an end of the shaft 61 a and an end of the shaft 61 b is fixed to the cassette guide 15.
Is attached. Then, FIGS. 11 (a) and 11 (b)
As shown in (5), a bar or the like is rotated by engaging a tool such as a screwdriver in the groove 61c, and the position of the head arm 57 in the height direction is adjusted. Also, this bar 61 is shown in FIG.
As shown by a solid line in (a) and (b), the bottom 90b of the holder 90 is configured to engage with the base 10 when the head is unloaded. The holder 90 has a base 10 on the side surface of the holder 90 when the head is unloaded.
An elastic portion 90a is formed so as to easily engage with the elastic member.

With the above arrangement, when the cassette guide 15 is unloaded to move upward, the head arm 57 is lifted to a raised position as shown in FIG.
The upper head 17A is held at the unload position. At this time, in order to reduce the thickness of the device while taking into account the force against the urging force of the spring 58, the bar 61 supports the head arm 57 at a substantially central portion between its fixed point and the holding point of the head 17A. It has been made like that.

Further, the movement of the holder 90 when the head shifts to the unload state will be described in detail. The movement of the holder 90 when shifting the head to the unload state will be described in detail. 15 moves upward, and the bar 61 also moves upward in FIG.
Move to the base 10 side. Immediately before shifting to the state shown in FIG. 5B, the holder 90 comes into contact with the side wall of the base 10 and hinders the movement of the holder 90. Part 90a
Smooth movement can be achieved due to deflection and formation of an inclined surface. Further, as shown in FIG. 11B, since the bar 61 has an eccentric shaft portion 61b, the disk cassette 11 is inserted when the head 17a is unloaded and a driver is inserted into the groove 61c of the bar 61. Is inserted and rotated, the eccentric shaft portion 61b is fitted with the cassette guide 15, so that the head arm 57 can be moved up and down by the amount of eccentricity. That is, the position of the head 17a can be adjusted.

As described above, the disk device of this embodiment is configured so that the upper head 17A and the lower head 17B can be simultaneously loaded on the upper and lower surfaces of the medium (disk) in the disk cassette 11. Have been. FIG. 12 shows a state where the cassette guide 15 and the heads 17A and 17B are at the unload position. In this state, the upper surface (the highest portion) of the cassette guide 15 and the upper surface (the highest portion) of the head arm 57 are shown.
Are arranged so as to have substantially the same height, that is, to be substantially coplanar. In the present embodiment, FIG.
As shown in FIG. 2, by setting the distance between the upper surface of the cassette guide 15 or the upper surface of the head arm 57 and the cover 63 (FIG. 12) covering the open upper surface of the base 10 in this unloaded state as small as possible, The height (thickness) is configured to be as small as possible.

According to the embodiment described above, while rotating the disk as the recording medium, the head 17A,
In a disk device that records or reproduces information on the disk by moving 17B in a predetermined direction on the disk, a bar 61 held by a cassette guide 15 and the other end of the bar 61 are mounted. It has a head loading / unloading means composed of a holder 90 and a structure in which the holder 90 is securely engaged with the base 10 at the time of unloading. Therefore, regardless of the position of the head in the disk radial direction, The distance between the lower head and the upper head during unloading can be made constant, and the device can be made thinner. Also, the reliability has been improved.

[0039]

As is apparent from the above description, in the present invention, the supporting portion for supporting the head arm in the moving direction of the head carriage has a plurality of shaft portions having different diameters. Since the shaft portions are eccentrically connected in the axial direction, the head can be reliably moved from a recordable or reproducible position to a non-recordable position with a compact configuration.

Further, since a mechanism is provided which enables fine adjustment of the position of the head attached to the head arm in a position where recording and reproduction are not possible, it is possible to provide a disk device which can be made thinner and highly reliable. Can be.

[Brief description of the drawings]

FIG. 1 is a plan view showing an unloaded state of a disk device according to an embodiment of the present invention, with a cover removed.

FIG. 2 is a plan view showing a state where the disk device of FIG. 1 is loaded, with a cover removed.

FIG. 3 is a front view taken along line 3-3 in FIG. 2;

FIG. 4 is a rear view taken along line 4-4 in FIG. 2;

5A and 5B are enlarged views of a main part of the embodiment, in which FIG. 5A shows a state in which a bar for unloading a head arm is moving, and FIG. It shows the state where it is.

6A and 6B are diagrams showing a configuration on the bottom surface of the base of the disk device of FIG. 1, wherein FIG. 6A is a plan view, FIG. 6B is a front view seen from line BB in FIG. () Is a side view seen from line CC in (a).

FIG. 7 is a partial side view showing a state when the button lever in FIG. 1 is unloaded.

FIG. 8 is a partial side view showing a state when the operation lever and the cassette guide in FIG. 1 are unloaded.

FIG. 9 is a partial side view showing a state when the button lever in FIG. 2 is loaded.

FIG. 10 is a partial side view showing a state in which an operation lever and a cassette guide in FIG. 2 are loaded.

FIGS. 11A and 11B are enlarged explanatory views of a main part of the present embodiment, in which FIG. 11A schematically shows a mechanism, and FIG. 11B shows a method of adjusting the height of a head arm.

FIG. 12 is a vertical sectional view of a portion of the head seek mechanism taken along line 10-10 in FIG. 1;

FIG. 13 is an enlarged explanatory diagram of a main part of the present embodiment.

[Explanation of symbols]

 Reference Signs List 10 Base 11 Disk cassette 15 Cassette guide 17A Upper head 17B Lower head 18 Head seek mechanism 31 Motor for driving disk 33 Cassette loading mechanism 51 Motor for driving head 53 Drive shaft (lead screw) 54 Head carriage 55 Guide bar 57 Head arm 58 Spring (for biasing head arm) 61 Bar (for lifting head arm) 61a Shaft portion 61b Shaft portion 61c Groove 90 Holder 90a Elastic portion 90b Bottom portion

Claims (2)

(57) [Scope of request for utility model registration] 1. A disk device for recording or reproducing information on or from a recording medium by rotating a recording medium in a predetermined direction while rotating the recording medium. A head carriage movable in the radial direction of the medium, a head arm supported by the head carriage and holding a second head facing the first head, and recording or reproducing information on or from the recording medium Moving means for moving the second head to a possible first position and an impossible second position, wherein the head carriage has a longitudinal direction of the head carriage and a moving direction of the head carriage. The moving unit is provided so as to be substantially perpendicular to the moving direction, and the moving unit moves the head arm forward when the second head is located at the second position. A supporting portion having one end held by the moving means and the other end being a free end and extending in parallel with the moving direction of the head carriage so as to be supported in the moving direction of the head carriage; and And a support unit holding member having an elastic portion having elasticity in a moving direction of the head carriage is provided on a free end side of the support unit. 2. A disk device for recording or reproducing information on or from a recording medium by rotating a disk-shaped recording medium and moving a head in a predetermined direction. A head carriage movable in the radial direction of the medium, a head arm supported by the head carriage and holding a second head facing the first head, and recording or reproducing information on or from the recording medium Moving means for moving the second head to a possible first position and an impossible second position; and a longitudinal direction of the head carriage, and a moving direction of the head carriage, Wherein the moving means is configured to move the head arm when the second head is located at the second position. A support portion that supports over, the supporting portion has a plurality of shaft portions having different diameters, the disk device, characterized in that the plurality of shaft portions which are axially connected to be eccentric.