JP2002213564A - Feed screw drive device and information recording and/or reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a feed screw drive device applying only axial force without applying radial force and preventing an increase of a drive load even at high- speed drive by devising the structure of the power transmission member of the feed screw drive device and to provide an information recording and/or reproducing device having the feed screw drive device. SOLUTION: A feed nut 48 coupled with a feed screw 45 is moved in the axial direction of the feed screw 45 by rotatively driving the feed screw 45 with a feed motor 46. This feed screw drive device is provided with a coil spring 57 exciting the feed nut 48 in the axial direction of the feed screw 45.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a feed screw in which a power transmission member engaged with a feed screw is moved in the axial direction of the feed screw by rotating the feed screw with a drive source such as an electric motor. The present invention relates to a driving device, and an information recording and / or reproducing device that drives a pickup device with the feed screw driving device to record and / or reproduce information signals on a disk-shaped recording medium. In particular, the present invention removes the axial play between the power transmission member and the feed screw when converting the rotational motion of the feed screw driven by the drive source into the linear motion of the power transmission member, thereby achieving high-speed driving and high speed operation. The present invention relates to a feed screw driving device capable of realizing position control, and an information recording and / or reproducing device provided with the feed screw driving device.

[0002]

2. Description of the Related Art Conventionally, a disk drive device is generally provided as a device for recording and reproducing information signals using an optical disk such as a CD (compact disk) or a CD-ROM (read only memory) as a disk-shaped recording medium. Have been. As such a disk drive device, for example, one having a configuration as shown in FIG. 18 is known.

FIG. 18 shows a schematic configuration of a disk drive device 1. An optical pickup device 2 having an optical head 2a, a slide member 3 on which the optical pickup device 2 is mounted, and the slide member 3 Two guide shafts 4a and 4b slidably supported in parallel with each other, a feed screw driving device 5 for linearly reciprocating the optical pickup device 2 along the guide shafts 4a and 4b, It is provided with a spindle motor and the like which are not used. The rotating shaft of the spindle motor projects upward. An optical disc is mounted on a turntable (not shown) fixed to the upper end of the rotating shaft, and the optical disc is driven to rotate at a predetermined speed by driving the spindle motor.

[0004] The two guide shafts 4a and 4b are arranged so as to sandwich the spindle motor on one side in the axial direction. Both ends of the slide member 3 are slidably supported by the guide shafts 4a and 4b, and can move toward and away from the spindle motor. A power transmission member 6 constituting a part of the feed screw driving device 5 is attached to the slide member 3. The feed screw drive device 5 includes a feed motor 7, a feed screw 8, a support plate 9, and the like, in addition to the power transmission member 6.

The power transmission member 6 of the feed screw driving device 5 is
As shown in FIG. 19, the plate spring 10 includes a flexible leaf spring 10 and a feed nut 11 made of a synthetic resin material and fixed to a free end of the leaf spring 10. Leaf spring 1
Numeral 0 is attached to the lower surface of the slide member 3 by a fixing screw in a state where the flat feed nut 11 is protruded to the side. The feed nut 11 has two projecting ridges 11a projecting from the lower surface of the leaf spring 10 and extending in parallel with each other. The two protruding ridges 11a are urged by the spring force of the leaf spring 10 to engage with the screw groove 8a of the feed screw 8, and are pressed by the rotation of the screw groove 8a to cause the feed nut 11 to rotate. It is slid in the axial direction.

The feed screw 8 is configured as a rotation shaft of a feed motor 7, and the feed motor 7
Is fixed to a motor support piece 9a provided at one end in the longitudinal direction of the motor. The distal end of the feed screw 8 penetrating the motor support piece 9a is rotatably supported by a bearing member 12, which fits into a screw support piece 9b provided at the other longitudinal end of the support plate 9. Are held together.

Thus, when the feed motor 7 is driven to rotate the feed screw 8, the ridge 11 a is rotated by the rotation of the feed screw 8, and the ridge 11 a is rotated in accordance with the rotation direction of the feed screw 8. Pressed in one or the other of the directions. This pressing force is transmitted to the slide member 3 from the ridge 11a via the feed nut 11 and the leaf spring 10. As a result, the slide member 3 is guided by the two guide shafts 4a and 4b, and is moved in a direction approaching or away from the spindle motor.

[0008]

However, in such a conventional feed screw driving device 5 of the disk drive device 1, a power transmitting member 6 for transmitting the driving force of the feed screw driving device 5 to the slide member 3 is a plate. The feed nut 11 is formed by a spring 10 and a feed nut 11. The feed nut 11 is urged and pressed against the feed screw 8 by the spring force of the leaf spring 10, and a thread groove 8 a of the feed screw 8 and a ridge of the feed nut 11 are formed. 11a, the gap (play) generated between them was removed. Therefore, when the rotation speed of the feed screw 8 increases,
Since the feed nut 11 is easily disengaged from the thread groove 8a, in order to secure the engagement between the feed screw 8 and the feed nut 11, the pressing force of the feed nut 11 must be reduced in accordance with an increase in the rotation speed of the feed screw 8. Need to increase.
As a result, there is a problem that a driving load increases due to an increase in the pressing force of the feed nut 11, and a high-output motor is required for high-speed driving.

That is, in the conventional feed screw driving device 5 as shown in FIG. 19, the rotation of the feed screw 8 causes the power transmission member 6 to move the power transmission member 6 in the axial direction of the feed screw 8. And a radial force Y for moving the power transmission member 6 radially outward from the feed screw 8. Usually, the shape of the screw groove 8a is a V-shaped groove in order to maintain good engagement with the ridge 11a, so that the radial force Y increases and the ridge 11a is Away from the ridge 11
This causes backlash between a and the screw groove 8a. Therefore, as described above, the feed nut 11 is held by the leaf spring 10, and the ridge 11 a is pressed against the thread groove 8 a, and the ridge 11 a is pressed against the thread groove 8 a by the spring force of the leaf spring 10 to reduce the play. I try to remove it.

However, in the conventional disk drive device 1 used for audio equipment, CD players, and the like, the processing speed of the information signal by the pickup device does not have to be so high.
Also, the driving speed was not required to be so high, and similarly, the driving accuracy was not required to be so high. However, in recent years, the recording density of the disk-shaped recording medium has been increased, and the recording function has been generalized in addition to the reproducing function.
With the enrichment, it has become necessary to increase the processing speed of information signals by the pickup device. As a result, the drive speed of the feed screw drive device is also required to be increased, and the need for a high-precision drive mechanism is increasing.

In response to such a demand, in the conventional feed screw driving device as described above, when the feed screw 8 is driven at a high speed, the radial force Y for separating the feed nut 11 from the feed screw 8 also becomes large. . If the radial force Y increases, the ridge 11a separates from the thread groove 8a and the backlash increases. To prevent this, the spring force of the leaf spring 10 is increased and the ridge 11a is removed from the thread groove 8a. Need to be pressed strongly. Then, the feed motor 7 is connected to the feed screw 8
There is a problem that a high output motor is required because a driving load for rotating the motor increases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and the structure of the power transmission member of the feed screw driving device is devised so that only the axial force acts and the radial force acts. It is another object of the present invention to provide a feed screw driving device that does not increase the driving load even when high-speed driving is performed, and an information recording and / or reproducing device including the feed screw driving device.

[0013]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems and to achieve the above object, a feed screw driving device according to the present application uses a drive source to rotate a feed screw so that the feed screw can be driven. In a feed screw driving device in which the engaged power transmission member is moved in the axial direction of the feed screw, an elastic member for urging the power transmission member in the axial direction of the feed screw is provided.

Further, the information recording and / or reproducing apparatus of the present application moves the power transmission member engaged with the feed screw in the axial direction of the feed screw by rotating and driving the feed screw by the drive source. An information recording and / or reproducing apparatus for recording and / or reproducing information by moving a pickup device in a radial direction of a disk-shaped recording medium via a transmission member;
Alternatively, in the reproducing apparatus, an elastic member for urging the power transmission member in the axial direction of the feed screw is provided.

With the configuration described above, in the feed screw driving device and the information recording and / or reproducing device of the present application, the power transmission member is urged in the axial direction of the feed screw by the elastic member, so that the motor The feed screw can be driven at high speed without increasing the driving load, and position control can be performed with high accuracy even during high-speed driving.

[0016]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 17 show an embodiment of the present invention. That is, FIG. 1 is a perspective view showing an embodiment of an information recording and / or reproducing apparatus using a feed screw driving device according to the present invention, and FIG. 2 is a sectional view of a part of the feed screw driving device shown in FIG. FIG. 3 is a perspective view of the feed screw driving device of FIG. 2 as viewed from the back side, and FIG. 4 is a perspective view of the same feed screw driving device at different angles. FIG.
Is a sectional view for explaining a main part of the feed screw driving device shown in FIG. 2, and FIG. 6 is an exploded perspective view showing a first embodiment of a power transmission member according to the feed screw driving device.

FIG. 7 is a perspective view of a first nut member of the power transmission member shown in FIG. 6, FIG. 8 is a side view of the first nut member,
FIG. 9 is a front view of the first nut member, and FIG. 10 is a longitudinal sectional view of FIG. 11 is a perspective view of a second nut member of the power transmission member shown in FIG. 6, FIG. 12 is a side view of the second nut member, FIG. 13 is a front view of the second nut member, and FIG.
3 is a longitudinal sectional view of FIG. FIG. 15 is a perspective view showing one embodiment of a use state of the information recording and / or reproducing apparatus shown in FIG. 16 and 17 show a second embodiment of the power transmission member. FIG. 16 is a sectional view corresponding to FIG. 5, and FIG. 17 is an exploded perspective view of the same.

The disk drive 20 shown as an embodiment of the information recording and / or reproducing apparatus of the present invention can record a video signal such as video information, a music signal such as audio information, and other information signals only once (additional recording). Rewritable) or a recordable (rewritable) optical disk that can be used repeatedly as many times as a disk-shaped recording medium. However, as an information recording and / or reproducing device, a disk reproducing device dedicated to reproducing information,
Alternatively, it is needless to say that the present invention can be applied to a disk recording device that exclusively records information.

In accordance with this, the present invention is not limited to the disk-shaped recording medium of this embodiment, but is a read-only optical disk in which all predetermined information signals are recorded in advance and the information signals cannot be written later. Needless to say, a magnetic disk in which a magnetic thin film layer is formed on the surface of a thin disk to store information signals according to the magnetization state at a specific position, and an optical head and a magnetic head are used for the magnetic thin film layer similarly formed. A magneto-optical disk or other storage medium that performs writing and reading of an information signal by using the same can also be applied.

As shown in FIG. 1, the disk drive device 20 includes a table drive device 21 for driving an optical disk to rotate at a predetermined speed (for example, a constant linear speed) and a pickup device for writing and reading information signals. An optical pickup device 22 showing a specific example, and a pickup moving device 23 for moving the optical pickup device 22 forward and backward with respect to the table driving device 21 are provided.

The table driving device 21 includes a spindle motor 25, a turntable 26 fixed to the end of a rotating shaft of the spindle motor 25, and a chucking plate (not shown) for holding an optical disc between the turntable 26. And the like. The spindle motor 25 is mounted on an upper surface of a motor base plate 27 made of a thin sheet metal, and a flexible wiring board 28 is fixed to an upper surface of the motor base plate 27 by fixing means such as an adhesive.

The wiring circuit of the flexible wiring board 28 includes:
The wiring of the spindle motor 25 and the wiring of the table driving connector 29a are connected. The first terminal of the flexible wiring board 30 is connected to the connector 29a, the second connector 29b is connected to the second terminal, and the third terminal is connected to the third terminal.
Is connected to a third connector 29c.
The second and third connectors 29b and 29c are fixed to the wiring base plate 31.

The spindle motor 25 has a fixed portion fixed to a motor base plate 27 and a rotating portion rotatably supported by the fixed portion. Are fitted together by fixing means such as press-fitting and are integrally formed. Turntable 2
Reference numeral 6 has a fitting portion 26a fitted into a center hole of an optical disk (not shown), a mounting portion 26b continuous with the lower end of the fitting portion 26a, and on which the optical disk is mounted. A chucking plate is installed to face the turntable 26, and the optical disk mounted on the mounting portion 26b is pressed by the chucking plate, whereby the optical disk is chucked by the turntable 26 and integrally rotated. It is possible.

A pair of guide shafts 32a and 32b are disposed so as to be substantially parallel to each other so as to sandwich the spindle motor 25 from both sides. A pair of guide shafts 32a,
32b is formed of a round bar-shaped member having a smooth outer peripheral surface. Then, both ends of the first guide shaft 32 a are supported by the adjustment plate 33, and the second guide shaft 3
2b is supported at both ends by a chassis described later.
The adjustment plate 33 is attached to the chassis so as to be able to change its attitude. By changing the attitude of the adjustment plate 33, the parallelism between the pair of guide shafts 32a and 32b can be adjusted.

The optical pickup device 22 is supported by the pair of guide shafts 32a and 32b so as to be able to move forward and backward so as to approach and separate from the turntable 26. One end of the pair of guide shafts 32a and 32b is disposed on both sides of the spindle motor 25, and the other end is substantially parallel and extends in a direction away from the spindle motor 25.

The optical pickup device 22 includes a slide member 35 which is guided and slid by a pair of guide shafts 32a and 32b, an optical head 36 mounted on the slide member 35 and reciprocated. ing. The slide member 35 is large enough to straddle the pair of guide shafts 32a and 32b, and is formed in a block shape to increase rigidity. On one side in the longitudinal direction of the slide member 35, there are provided bearing portions 35a and 35b that make a pair in a width direction crossing the slide member 35. A first guide shaft 32a is slidably inserted into these bearing portions 35a and 35b.

On the other side of the slide member 35 in the longitudinal direction,
An insertion hole (not shown) through which the second guide shaft 32b is slidably inserted is provided. The insertion hole is formed to be larger than the diameter of the second guide shaft 32b.
It can be tilted up and down about 2a as the center of rotation. Furthermore, the insertion hole is formed wide in the horizontal direction,
Thus, the second guide shaft 32b is configured to be slightly inclined with respect to the width direction of the slide member 35. Therefore, in this embodiment, the pair of guide shafts 32
Even if a and 32b are not parallel to each other and slightly cross each other, the slide member 35 can be smoothly slid while being guided by the first guide shaft 32a.

Optical head 3 of optical pickup device 22
6 is a two-axis actuator having an objective lens 37;
An optical control unit having a semiconductor laser and a photoelectric conversion element for recording and reproducing information signals via the biaxial actuator is provided. Most of the two-axis actuator is covered by a head cover 38, and an objective lens 37 is exposed from an opening provided in the head cover 38. The objective lens 37 of the optical head 36
Faces the information recording surface of the optical disc mounted on the turntable 26. Further, a pickup connector 39 attached to the upper surface of the slide member 35 is electrically connected to the optical control unit. The flexible wiring board 28 described above is connected to the connector 39.

The first of the pair of guide shafts 32a, 32b
The guide shaft 32 a is supported by a pair of shaft support pieces 40 provided on the adjustment plate 33. The adjustment plate 33 is formed of an elongated plate made of sheet metal having a length substantially equal to that of the guide shaft 32a. At both ends in the longitudinal direction of the adjustment plate 33, a pair of shaft support pieces 40, 40 projecting to the same side in the width direction intersecting the longitudinal direction are provided. Each of the shaft support pieces 40 has a tip raised up and a base portion bent in a crank shape, whereby an L-shaped shaft support raised to a predetermined height from a support surface is provided on a free end side. A portion 40a is formed.

A pair of shaft support pieces 4 having such a shape
The first guide shaft 32a is attached to each of the 0, 40 shaft support portions 40a.
Are positioned and mounted. Each end of the first guide shaft 32a is pressed and fixed by a shaft holding plate 41 screwed to the shaft support 40a with a fixing screw 42. The shaft holding plate 41 is provided with the first guide shaft 3.
A pressing piece 41a that presses the end of 2a from the radial direction;
A leaf spring having a suitable elasticity, having a stopper piece 41b for abutting against the end face of the guide shaft 32a to prevent movement in the axial direction, and a locking piece 41c for preventing rotational displacement of the shaft pressing plate 41. Is formed by

At a substantially central portion of the shaft holding plate 41, a fixing screw 42 is provided.
Is provided, a pressing piece 41a is provided so as to protrude to one side with the inserting hole interposed therebetween, and a locking piece 41c is provided to protrude to the other side. The stopper piece 41b is provided so as to protrude at a substantially central portion of the shaft pressing plate 41 in a direction orthogonal to a direction connecting the pressing piece 41a and the locking piece 41c. Further, the stopper piece 41b is formed by bending so that the tip part protrudes toward the pressing piece 41a, and the tip part abuts on the end face of the first guide shaft 32a by raising the tip part upward. . Further, the locking piece 41c is locked in a concave portion provided in the shaft support piece 40.
The shaft holding plate 41 is prevented from rotating even when a large force is applied to the b from the guide shaft 32a. Note that the pair of shaft holding plates 41, 41 have a symmetrical shape.

The adjustment plate 33 having such a configuration
Is attached to a chassis as described later, for example. The second guide shaft 32b is directly attached to a pair of shaft support pieces provided on the chassis using a pair of shaft holding plates, as will be described later. Then, a feed screw driving device 44 is attached to the adjustment plate 33.

The feed screw driving device 44 is shown in FIGS.
As shown in an enlarged manner in FIG.
, A support plate 47 and a power transmission member 48. The feed screw 45 is connected to the guide shafts 32a and 32b.
The spirally extended 1 is provided on the outer peripheral surface of a round bar slightly shorter than
It is formed by providing the thread groove 49 of the strip over substantially the entire length in the axial direction. The screw shape of the feed screw 45 is preferably a trapezoidal screw having a trapezoidal cross-sectional shape with a slight inclination on both sides of the groove, but may be a square screw having a rectangular cross-sectional shape, Alternatively, a semi-circular screw having a semi-circular cross-sectional shape may be used, and a screw of another well-known shape may be applied. Further, in this embodiment, the feed screw 45 is formed by a right-handed screw, but it is needless to say that a left-handed screw can be used.

The feed screw 45 also serves as a rotating shaft of a feed motor (electric motor) 46 as a drive source, and is directly rotated by the feed motor 46. Feed motor 46
Has a cylindrical motor case 46a and a case cover 46b closing one opening of the motor case 46a. The motor case 46a includes a support plate 47
Is fixed to the motor support piece 47a by a fixing means such as caulking or the like to be integrally formed. This motor case 46
A coil portion wound in a ring shape is fitted and fixed to the inner peripheral surface of a. A feed screw 45 is provided inside the coil portion.
A ring-shaped magnet fixed by press-fitting or the like to an end of the ring is rotatably fitted.

The end of the feed screw 45 on the magnet side is rotatably supported by a disc-shaped bearing member (not shown) mounted so as to close the opening of the motor case 46a. The motor case 46a is arranged so as to cover the bearing member, and the feed motor 46 is assembled by engaging a pair of engagement pieces with engagement holes provided on the outer peripheral surface of the motor case 46a.

The support plate 47 is formed of an elongated plate made of sheet metal having a length substantially equal to that of the feed screw 45. By raising both ends in the longitudinal direction of the support plate 47 in the same direction, a motor support piece 47a and a screw support piece 47b are provided so as to be parallel to each other. A through hole 50a is provided substantially at the center of the motor support piece 47a, and a fitting hole 50b is provided above the screw support piece 47b at a height corresponding to the through hole 50a. The feed motor 4 is provided on the outer surface of the motor support piece 47a.
6 is fixed, and the feed screw 45 passes through the through hole 50a. The leading end of the feed screw 45 is fitted into the fitting hole 50.
The supporting member 51 is rotatably supported by a bearing member 51 fitted and fixed to the member b.

The support plate 47 is provided with a guide ridge 52 by standing up one side in the width direction continuously in the longitudinal direction. This guide ridge 52
Is arranged substantially directly below the feed screw 45,
The feed screw 45 extends so as to be substantially parallel to the axis of the feed screw 45. Further, the support plate 47 is provided with two insertion holes 50c at two places, and as shown in FIG. 1, the support plate 47 is adjusted by the mounting screws 53 through which the shafts are inserted through the insertion holes 50c and 50c. 33.

Further, each insertion hole 50 of the support plate 47 is
c, a pair of positioning holes 54a for positioning,
54b are provided. These positioning holes 54a,
The support plate 47 is positioned at a predetermined position with respect to the adjustment plate 33 by engaging the positioning protrusion provided on the adjustment plate 33 with 54b. This allows
By simply assembling the support plate 47 with the adjustment plate 33, the axis of the first guide shaft 32a and the axis of the feed screw 45 can be automatically set in a substantially parallel state.

The feed nut 48, which is a specific example of the power transmission member, converts the rotational force of the feed screw 45 into linear motion and transmits the linear motion to the slide member 35.
5 and a second nut member 56.
Then, the first nut member 55 and the second nut member 56
A coil spring 57, which is a coil-shaped elastic body, showing a specific example of an elastic member is interposed between the coil spring 57 and the elastic member. The spring force of the coil spring 57 urges the pair of nut members 55 and 56 away from each other, thereby absorbing axial play between the feed nut and the feed screw 45.

As shown in FIGS. 5 to 10, the first nut member 55 is a block-shaped nut body 55a.
And a cylindrical first cylindrical shaft portion 55b formed continuously on one surface side of the nut main body 55a. An axial hole 55c penetrates through the center of the nut main body 55a and the first cylindrical shaft portion 55b, and the nut main body 55a side of the axial hole 55c is engaged with the thread groove 49 of the feed screw 45. A first screw portion 58 is provided.

As shown in FIGS. 9 and 10, the first screw portion 58 is formed at a position slightly inward from one end face 55d of the nut main body 55a.
A portion between the first screw portion 58 and the screw start end S where the first screw portion 58 starts is a screwless portion N. The first screw portion 58 is a complete screw portion P in which a thread having a predetermined shape is formed continuously in a perfect shape.
And an incomplete thread portion H until the thread is gradually removed and disappears. The completely threaded portion P extends from the beginning S of the thread to the midpoint T of the thread, and the incomplete threaded portion H
Is between the screw middle point T and the screw end point E.

As described above, the reason why the incompletely threaded portion H is provided so as to be continuous with the completely threaded portion P is that the end of the first threaded portion 58 on the incompletely threaded portion H side is connected to the threaded portion of the feed screw 45. This is to prevent the bite from coming off. Therefore, when there is no possibility that the incomplete threaded portion H may bite between the threaded portions even by the reverse rotation of the feed screw 45, the incomplete threaded portion H is eliminated and the entire first threaded portion 58 is completely screwed. P can be formed. The threadless portion N is provided in consideration of the balance with the incomplete threaded portion H, and may be configured as the same incompletely threaded portion as the incompletely threaded portion H. Abolished and start S of threaded part P
May be made to coincide with the end face 55d.

The shape of the thread at the complete threaded portion P of the first threaded portion 58 is a round thread having a semicircular tip. As described above, when the shape of the thread of the first nut member 55 is a round screw, the shape of the thread of the feed screw 45 is a trapezoidal screw. A smooth sliding operation can be ensured. However, the shape of the thread is not limited to that of this embodiment, and a combination of the same shape such as a round screw, a trapezoidal screw, a square screw, a triangular screw, and a saw tooth screw, or any combination thereof Combinations can also be applied. in this case,
When there is a corner at the tooth tip of the feed screw, it is preferable that the corner be rounded or beveled.

The nut body 55a of the first nut member 55
A drive projection 60 and an arc-shaped projection 61 projecting in a direction orthogonal to the direction in which the first cylindrical shaft portion 55b extends are provided on the outer surface of the first cylindrical shaft 55b. The drive projection 60 is provided on the first nut member 5.
5 is transmitted to the slide member 35, and is formed by a pin-shaped convex portion. Also, the arc-shaped protrusion 6
Numeral 1 is disposed at a position rotated and displaced by 90 degrees with respect to the drive projection 60. At the center of the arc-shaped projection 61,
A slit 62 is provided that extends in the direction in which the first cylindrical shaft portion 55b extends and that penetrates between the front and back surfaces, and is a specific example of a concave portion. The guide ridges 52 of the support plate 47 described above are slidably engaged with the slits 62.

The first cylindrical shaft portion 55b of the first nut member 55 is provided with a shaft slit 63 which extends linearly from a middle portion in the axial direction and is opened at the opening-side end face. . The shaft slit 63 is formed to penetrate from the outer peripheral surface to the inner peripheral surface of the first cylindrical shaft portion 55b. A key-shaped projection 64 provided on the second nut member 56 is slidably engaged with the shaft slit 63.

As shown in FIGS. 5, 6, and 11 to 14, the second nut member 56 is formed of a cylindrical body formed in a sleeve shape, and has an axial hole 56a penetrated in the center thereof. I have. On one side of the axial hole 56a, there is provided a fitting hole 65 into which the first cylindrical shaft portion 55b of the first nut member 55 is removably fitted, and the fitting hole 65 is formed. The portion to be formed is a second cylindrical shaft portion 56b. A key-like projection 64 protruding radially inward is provided in the fitting hole 65 of the second cylindrical shaft portion 56b. The radially inner flat portion of the key-shaped projection 64 uses the inner peripheral surface of the axial hole 56a, and the key-shaped projection 64 extends linearly in the axial direction by leaving the same width as the axial slit 63. A projection 64 is formed.

The axial hole 5 of the second nut member 56
On the other side of 6a, a second screw portion 66 is provided which is engaged with the screw groove 49 of the feed screw 45. FIG. 13 and FIG.
As shown in FIG. 4, the second screw portion 66 is connected to the first screw portion 56.
It has the same configuration as That is, the second screw portion 66
Is formed at a position slightly inward from one end face 56c of the second nut member 56, and the end face 56c
A portion between the first screw portion 66 and the screw start end S where the second screw portion 66 starts is a screwless portion N. The second screw portion 66 also has a complete screw portion P and an incomplete screw portion H, like the first screw portion 56.

The reason why the incomplete thread portion H is provided in the second thread portion 66 is also the same, and the end of the complete thread portion P is
The reason for this is to prevent the bite 5 from being dislodged due to biting. Therefore, even when the reverse operation of the feed screw 45 is repeated, if there is no possibility that the complete screw portion P will bite into the feed screw 45, the incomplete screw portion H is eliminated and the entire screw portion 56 is completely screwed. It can be a part P. Further, the threadless portion N may have the same configuration as the incomplete threaded portion H, or may have a configuration without the threadless portion N. As a material of the first nut member 55 and the second nut member 56, for example, carbon fiber reinforced plastic is suitable, but high-strength engineering plastics or ceramics can also be used.

The coil spring 57 includes a first nut member 55
Of the first cylindrical shaft portion 55b. The coil spring 57 is a compression spring, and can be made by winding a steel wire into a coil shape, for example. However, in a preferred embodiment, the coil spring 5
The elastic member to which No. 7 is applied is not limited to this embodiment. For example, various elastic members such as a torsion spring, a conical coil spring, and a bamboo shoot spring can be used. Not only metals but also engineering plastics used as this kind of material can be used. Further, a rubber-like elastic body may be formed in a cylindrical shape and used as an elastic member.

The first nut member 55, the second nut member 56, and the coil spring 57 having such a configuration are combined in a state as shown in FIGS. Can be First, after inserting the coil spring 57 into the first cylindrical shaft portion 55b of the first nut member 55, the first cylindrical shaft portion 55b is fitted to the second cylindrical shaft portion 56b of the second nut member 56. The holes 65 are fitted. Next, the feed screw 45 is inserted through the feed nut 48 in which the first nut member 55 and the second nut member 56 are combined. In this embodiment, the feed screw 45 is configured to be inserted from the second nut member 56 side and protrude from the first nut member 55.

In this case, the first nut member 55 and the second nut member 56 are brought close to each other to slightly compress and contract the coil spring 57, and the compressed state is maintained, and the feed screw 45 is inserted while turning. Thereby, the feed screw 45
The first screw portion 5 of the first nut member 55 is
8 are engaged with each other, and the second nut member 5 is
6 are simultaneously engaged with each other. At this time, one end of the coil spring 57 is in contact with the inner end face of the nut body 55a of the first nut member 55, and the other end is the second end.
Of the nut member 56 on the side where the key-shaped protrusion 64 is provided.

As a result, the first nut member 55 is urged away from the feed motor 46 by the spring force of the coil spring 57, and the second nut member 56 is
6 is urged in a direction approaching. Therefore, in FIG. 5, in the first screw portion 58 of the first nut member 55, the left screw surface in the figure is pressed against the left screw surface of the feed screw 45, and a gap is generated between the right screw surfaces. Similarly, in the second screw portion 66 of the second nut member 56, the right screw surface in the figure is pressed against the right screw surface of the feed screw 45, and a gap is generated between the left screw surfaces.

As a result, the first nut member 55 and the second
Feed nut 48 in combination with the nut member 56 of FIG.
A gap between the whole and the feed screw 45 can be eliminated, so that there is no play. This play-free state between the feed nut 48 and the feed screw 45 can be maintained regardless of the rotation direction of the feed screw 45.

To insert the feed screw 45 into the feed nut 48, the feed screw 45 is inserted into the motor case 46a of the feed motor 46 and the motor support piece 47a of the support plate 47.
This is performed in a state of being inserted through the through hole 50a. Next, a slit 62 provided in the arc-shaped projection 61 of the first nut member 55
Is engaged with the guide ridge 52 of the support plate 47. Then, the tip end of the feed screw 45 is fitted to the bearing member 51 fitted in the fitting hole 50b of the shaft support piece 47b of the support plate 47.
Into the bearing hole. Then, after the bearing member is set in the opening of the motor case 46a, the case cover 46b is attached to the opening. Thus, the assembling work of the feed screw driving device 44 is completed.

The driving projection 60 of the feed screw driving device 44
As shown in FIG. 1, a projection receiving member 68 fixed to the slide member 35 is engaged, and the moving force of the feed nut 48 is transmitted to the slide member 35 via the projection receiving member 68. . As shown in FIG. 2, the projection receiving member 68 includes a fixing piece 68a for fixing to the slide member 35, and a support piece 68 connected to the fixing piece 68a.
b and an elastic piece 68c connected to the support piece 68b.

The fixing piece 68a of the projection receiving member 68 is made of an elongated plate material, and is provided on one side in the width direction at an intermediate portion in the longitudinal direction.
An L-shaped support piece 68b protruding to one surface side is provided. A support portion 69a formed of a notch for receiving and supporting the driving projection 60 is provided at a free end side corner of the support piece 68b. Further, an elastic piece 68c extending in the same direction as the fixed piece 68a is provided at the base of the support piece 68b. The elastic piece 68c is formed by bending it into a triangle so as to exhibit elasticity of an appropriate strength, and the bent piece at the tip is formed as a pressing portion 69b to face the supporting portion 69a of the supporting piece 68b. I have.

The fixing piece 68a of the projection receiving member 68 is provided with two mounting holes for mounting the fixing piece 68a to the slide member 35. This projection receiving member 70
The slide member 35 is attached to a longitudinal side surface of the bearing portion 35a, 35b by a fixing means such as a fixing screw. The drive projection 60 of the feed nut 48 mounted on the feed screw 45 is inserted between the support portion 69a of the projection receiving member 68 and the holding portion 769 thus attached. Then, the driving projection 60 is held between the support portion 69a and the pressing portion 69b by the spring force of the elastic piece 68c,
Thereby, the first nut member 55 and the slide member 35
And the transmission of force is possible.

As a material of the adjusting plate 33 and the support plate 47, for example, a stainless steel plate is preferable. However, a steel plate or other metal plate can be used, and an engineering plastic having high strength can be used. It can also be used. Also,
As a material of the feed screw 45, for example, a metal material which is not easily rusted and has sufficiently large strength, such as stainless steel, is preferable. Further, as the material of the projection receiving member 68,
For example, a highly elastic stainless steel plate is suitable,
Other plate materials can be used.

The pair of guide shafts 32a and 32b, the adjustment plate 33, and the feed screw driving device 44 described above
A pickup moving device 23 for moving the optical pickup device 22 forward and backward with respect to the turntable 26 is configured.

The disk drive device 20 having such a configuration is, for example, a chassis 70 as shown in FIG.
It is used by being mounted on. The chassis 70 has a planar shape as if the tip of a shell was cut off, and the peripheral edge thereof was continuously bent upward to form a reinforcing rib 70.
a is provided. Support projections 71 for supporting the chassis 70 on a member (not shown) of the apparatus main body are provided at four positions of the reinforcing ribs 70a. A motor base plate 27 on which the spindle motor 25 is mounted is fixed to a substantially central portion of the chassis 70 by fixing means such as fixing screws.

A first opening 72a and a second opening 72b, both rectangular, are provided on both sides of the chassis 70 in the longitudinal direction with the spindle motor 25 interposed therebetween.
The above-described disk drive device 20 is attached in association with the first opening 72a. The second opening 72b is used to mount another disk drive device (not shown).

The adjustment plate 33 of the pickup transfer device 23 is arranged at one edge portion in the width direction of the first opening 72a of the chassis 70. At this time, the adjustment plate 3
The pair of shaft support pieces 40, 40 are directed inward, and in this state, the adjustment plate 33 is fastened and fixed to the chassis 70 by fixing screws 73a. The first guide shaft 3 is provided between the pair of shaft support pieces 40 of the chassis 70.
2a, and both ends thereof are pressed by a shaft holding plate 41 to be positioned and fixed at predetermined positions.

On the other hand, the second guide shaft 32b is arranged on the other side in the width direction of the first opening 72a so as to sandwich the spindle motor 25 between the second guide shaft 32b and the first guide shaft 32a.
Then, a pair of shaft support pieces 74, 7 provided on the chassis 70
The two end portions are pressed by a shaft holding plate 41 and fixed at predetermined positions. Each shaft support piece 74 is formed by cutting and raising a part of the chassis 70, and by directly screwing the shaft holding plate 41 to the chassis 70, the second guide shaft 32 b is positioned at a predetermined position of the chassis 70. Positioning is fixed. In this state, the first guide shaft 32a and the second guide shaft 32b are substantially parallel to each other and extend in a direction away from the spindle motor 25.

The slide member 35 is slidably supported by the pair of guide shafts 32a and 32b. A support plate 47 is arranged on the adjustment plate 33, and the support plate 47 is fixedly fastened to the adjustment plate 33 by fixing means such as fixing screws. And
The drive projection 60 of the first nut member 55 attached to the feed screw 45 is provided with a support portion 69 a and a pressing portion 69 of a projection receiving member 68 attached to the side surface of the slide member 35.
b.

The disk drive device 20 mounted on the chassis 70 can be used, for example, as follows. First, the optical disk is mounted on the turntable 26, and the optical disk is pressed against the turntable 26 by a chucking plate (not shown). This allows
The optical disk can be chucked on the turntable 26.

Next, by driving the spindle motor 25 to rotate the turntable 26, the optical disk is rotationally driven at a predetermined speed (for example, constant linear speed). After that, the feed motor 46 of the feed screw driving device 44 is driven to rotate the feed screw 45. Thereby, the first nut member 55 and the second nut member 55 are changed according to the rotation direction of the feed screw 45.
The nut member 56 moves in a direction approaching the turntable 26 or in a direction away from the turntable 26 in the opposite direction.

That is, when the feed screw 45 rotates clockwise when viewed from the feed motor 46 side, the two nut members 5
5 and 56 move in a direction approaching the feed motor 46. Conversely, when the feed screw 45 rotates counterclockwise, the nut members 55 and 56 move away from the feed motor 46 and move closer to the turntable 26. As a result, the movement of the first nut member 55 causes the slide member 35 to move in the same direction while being guided by the pair of guide shafts 32a and 32b. Then, when the slide member 35 moves in the direction away from the turntable 26, the optical pickup device 22 having the objective lens 37 facing the information recording surface of the optical disk reads out an information signal from the information recording surface at the time of reproduction, and at the time of recording. Write an information signal. The reproduction and recording of the information signal are performed in this manner, and the object can be achieved as the disk drive device 20.

In this case, in the feed screw driving device 44, as shown in FIGS. 1 to 5, a first nut member 55 and a second nut member 56 are screwed to the feed screw 45.
The screw grooves 5 of the nut members 55 and 56 are provided in the screw grooves 49.
8, 66 are meshed with each other. Further, the first nut member 55 and the second nut member 56 are connected to the shaft slit 6 provided in the first cylindrical shaft portion 55b of the first nut member 55.
By engaging a key-shaped protrusion 64 provided on the second cylindrical shaft portion 56b of the second nut member 56 with the third nut 3, the second nut member 56 is integrated in the rotation direction. Then, a coil spring 57 is inserted in a compressed state between the first nut member 55 and the second nut member 56, and the two nut members 55 and 56 are configured to be urged in directions away from each other. .

Therefore, the first nut member 55 is urged away from the feed motor 46 by the spring force of the coil spring 57 acting only in the axial direction of the feed screw 45, and the second nut member 56 is It is urged in a direction approaching 46. Therefore, in FIG.
In the first threaded portion 58 of FIG. 5, the thread surface on the left side in the figure is pressed against the thread surface on the left side of the feed screw 45, and a gap which cannot be removed due to the relationship between the screw and the nut due to manufacturing is formed between the thread surfaces on the right. Can be transferred. On the other hand, the second nut member 56
In the second screw portion 66, the right screw surface in the drawing is pressed against the right screw surface of the feed screw 45, and the gap can be similarly shifted between the left screw surfaces.

As a result, the combination of the first nut member 55 and the second nut member 56 can be viewed as one feed nut, so that a gap between the feed nut and the feed screw is eliminated, and a driving error is eliminated. It is possible to obtain a driving device capable of transmitting the driving force without causing the backlash. Therefore,
The moving force of the first nut member 55 due to the rotation of the feed screw 45 immediately causes the protrusion receiving member 6 without causing a driving error.
8, the driving of the slide member 35 can be accurately controlled.

Further, the spring force of the coil spring 57 acts only in the axial direction of the feed screw 45 and does not generate a component force directed in a direction intersecting the axial direction. Does not increase too much.
As a result, even when the speed of the feed motor 46 is high, the motor load is not significantly increased, so that a high-output motor is not required, and by using the same output motor as the conventional one, High-precision high-speed driving can be realized.

FIGS. 16 and 17 show a second example of a feed nut which is a power transmission member of the feed screw driving device 44 of the present invention.
FIG. The feed nut 75 shown in this embodiment is different from the first embodiment in that the first nut member 55
The first nut member 76 and the second nut member 7 are not connected so that they cannot rotate between the first nut member 76 and the second nut member 56.
7 are rotatably connected to each other, but the guide projections 52 of the support plate 47 prevent the nut members 76 and 77 from rotating individually, and are configured to be linearly movable only in the axial direction. It was done.

The first nut member 76 is connected to the nut body 55
a and a first cylindrical shaft portion 55b, and a first screw portion 58 is provided in an axial hole 55c penetrating the center portion.
Further, the nut main body 55a is provided with a driving projection 60 and an arc-shaped projection 61, and the arc-shaped projection 61 has a slit 62
Are formed. The difference between the first nut member 76 and the first nut member 55 of the first embodiment is that
Is that the shaft slit 63 of the cylindrical shaft portion 55b is eliminated.

The second nut member 77 is formed of a sleeve-like cylindrical body having an axial hole 56a, and a second screw portion 66 is provided on one side of the axial hole 56a.
By providing a fitting hole 65 on the other side of the axial hole 56a, a second cylindrical shaft portion 56b is formed. The difference between the second nut member 77 and the second nut member 56 of the first embodiment is that the key-shaped protrusion 64 provided in the fitting hole 65 is eliminated while the arc-shaped protrusion of the first nut member 76 is formed. Part 61
The present embodiment is different from the first embodiment in that a protrusion 78 similar to that described above is provided on the outer peripheral surface, and a slit 79 is formed in the protrusion 78. The protruding portion 78 protrudes radially outward in an arc shape, and a slit 79 is formed at the center of the outer surface. The slit 79 penetrates from one surface of the protruding portion 78 to the other surface and extends radially inward.

The first cylindrical shaft portion 55b of the first nut member 76 is rotatably fitted in the fitting hole 65 of the second nut member 77 having such a configuration. The feed screw 45 is inserted through a feed nut 75 composed of the first nut member 76 and the second nut member 77, and the feed screw 45
Guide ridge 5 of support plate 47 for rotatably supporting
2 is slidably engaged with the slit 62 of the arc-shaped protrusion 61 and the slit 79 of the protrusion 78.

According to the feed nut 75 having such a configuration, the coil spring interposed between the first nut member 76 and the second nut member 77, as in the first embodiment described above. 57, the first nut member 5
5 is urged away from the feed motor 46, and the second nut member 56 is urged toward the feed motor 46. Accordingly, in FIG. 16, the first screw portion 58 has the left screw surface pressed against the left screw surface of the feed screw 45,
The second screw portion 66 has a right screw surface pressed against the right screw surface of the feed screw 45. As a result, both surfaces of the screw portion of the feed nut are simultaneously pressed against both surfaces of the screw groove 49 of the feed screw 45, so that a gap that cannot be removed in manufacturing can be virtually eliminated.

As a result, the gap between the feed nut and the feed screw 45 is eliminated, and the driving force can be transmitted without generating a drive error (play). Further, the guide protrusions 52 are engaged with the slits 62 in the first nut member 76, and the guide protrusions 52 are simultaneously engaged in the slits 79 in the second nut member 77. 77 is not driven to rotate based on the rotation of the feed screw 45. Therefore, the moving force of the first nut member 76 due to the rotation of the feed screw 45 can be immediately transmitted to the projection receiving member 68 without causing a drive error, and therefore, the drive control of the slide member 35 can be accurately performed. it can.

As described above, the present invention is not limited to the above-described embodiment. For example, in the above-described embodiment, an example in which an electric motor is used as a driving source has been described. And the like can be used. Also, an example in which the feed nut 48 (75) is configured by two nut members has been described, but the feed nut is configured by one member, and the feed nut and the motor support piece 47a or the shaft support piece 47b are interposed. It is also possible to adopt a configuration in which a coil spring 57 is interposed. Further, an example has been described in which the first cylindrical shaft portion 55b is provided with the shaft slit 63 and the key-shaped projection 64 engaged with the shaft slit 63 is provided in the second cylindrical shaft portion 56b. The second cylindrical shaft portion 56b is provided with a shaft slit, and the projection engaged with the shaft slit is formed by the first cylindrical shaft portion 55.
The structure provided in b may also be adopted.

In the above embodiment, the support plate 47
The guide projection 52 is provided on the
Although the example provided in the nut member 55 described above was described, conversely, a guide elongated hole formed of an elongated hole or a groove is provided in the support plate 47, and the convex portion engaged with this guide elongated hole is formed as a first portion.
Nut member 55 (76) and second nut member 56
A configuration may also be provided in one or both of (77). Further, the example in which the feed screw driving device 44 is applied to the disk drive device 20 has been described. However, the present invention is not limited to this, and it is needless to say that the present invention can be applied to various devices that linearly drive the devices and components. As described above, the present invention can be variously modified without departing from the gist thereof.

[0080]

As described above, according to the feed screw driving device and the information recording and / or reproducing device of the present application, since the power transmission member is urged in the axial direction of the feed screw by the elastic member, the feed screw is driven. By eliminating the gap between the nut and the feed screw, it is possible to transmit the driving force without generating a driving error (play). Therefore, it is possible to realize high-speed driving of the feed screw without increasing the driving load of the motor, and it is possible to obtain an effect that position control can be performed with high accuracy even during high-speed driving.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of an information recording and / or reproducing apparatus using a feed screw driving device according to the present invention.

FIG. 2 is a perspective view showing a cross section of a power transmission member and the like of the feed screw driving device shown in FIG. 1;

FIG. 3 is a perspective view of the feed screw driving device shown in FIG. 2 as viewed from a driving projection side.

FIG. 4 is a perspective view of the feed screw driving device shown in FIG. 2 as viewed from a driving projection side at different angles.

FIG. 5 is an explanatory view showing a cross section of a main part of the feed screw driving device shown in FIG. 2;

FIG. 6 is an exploded perspective view showing a first embodiment of a power transmission member used in the feed screw driving device shown in FIG. 2;

FIG. 7 is a perspective view showing a first nut member of the power transmission member shown in FIG. 6;

FIG. 8 is a side view of the first nut member shown in FIG.

FIG. 9 is a front view of the first nut member shown in FIG. 6;

FIG. 10 is a longitudinal sectional view of the first nut member shown in FIG.

FIG. 11 is a perspective view showing a second nut member of the power transmission member shown in FIG.

FIG. 12 is a side view of the second nut member shown in FIG.

FIG. 13 is a front view of the second nut member shown in FIG.

FIG. 14 is a longitudinal sectional view of a second nut member shown in FIG. 6;

FIG. 15 is a perspective view showing one embodiment of a use state of the information recording and / or reproducing apparatus shown in FIG. 1;

FIG. 16 is a sectional view showing a second embodiment of the power transmission member used in the feed screw driving device according to the present invention and corresponding to FIG. 5;

FIG. 17 is an exploded perspective view showing a second embodiment of the power transmission member shown in FIG. 16;

FIG. 18 is a perspective view showing a main part of a conventional disk drive device.

FIG. 19 is an explanatory view showing a main part of a conventional feed screw driving device.

[Explanation of symbols]

Reference Signs List 20 disk drive device (information recording and / or reproducing device), 21 table drive device, 22 optical pickup device (pickup device), 23 pickup moving device, 25 spindle motor, 26 turntable, 35 slide member, 36 optical head, 44 Feed screw drive, 45 feed screw,
46 feed motor (drive source), 47 support plate,
48, 75 power transmission member (feed nut), 49
Screw groove, 52 guide ridge, 55, 76 first nut member, 55b, 56b cylinder shaft, 56, 77 second
Nut member, 57 coil spring (elastic member), 5
8, 66 screw portion, 60 drive protrusion (output portion), 62
Slit, 63 axis slit, 64 key-shaped protrusion (convex portion), 68 protrusion receiving member

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F16H 25/20 F16H 25/20 Z G11B 21/02 611 G11B 21/02 611E

Claims (12)

[Claims] 1. A feed screw driving device in which a power transmission member engaged with the feed screw is moved in an axial direction of the feed screw by rotating the feed screw by a drive source. A feed screw driving device provided with an elastic member for urging the feed screw in the axial direction of the feed screw. 2. The power transmission member comprises a tubular feed nut fitted to the feed screw, and the elastic member is loosely fitted to the feed screw and at least one end is seated on the feed nut. The feed screw driving device according to claim 1, wherein the driving screw drive device is formed of a coil-shaped or cylindrical elastic body. 3. The feed nut comprises a combination of a first nut member and a second nut member divided in an axial direction of the feed screw, wherein the first nut member, the second nut member, 3. An elastic body is interposed between the first and second members to urge them so as to be separated from each other in the axial direction.
A feed screw drive as described. 4. A first cylindrical shaft portion extending in the axial direction is provided on one of the first nut member and the second nut member, and the other is fitted with the first cylindrical shaft portion. A second cylindrical shaft portion, a slit extending in the axial direction is provided on one of the first cylindrical shaft portion and the second cylindrical shaft portion, and a convex portion engaged with the slit is provided on the other. 4. The feed screw driving device according to claim 3, wherein the first nut member and the second nut member are integrated in the rotation direction by engagement of the projection with the slit. 5. The elastic body is formed of a coil spring, and the coil spring is fitted on the first cylindrical shaft portion.
The feed screw driving device according to claim 4, wherein the coil spring is interposed in a compressed state between the first nut member and the second nut member. 6. An output unit for taking out, as a driving force, a force caused by movement of the feed nut, at least one of the first nut member and the second nut member is provided. A feed screw drive as described. 7. A power transmission member engaged with the feed screw is moved in the axial direction of the feed screw by rotating the feed screw by a driving source, and the pickup device is disc-shaped via the power transmission member. In an information recording and / or reproducing apparatus for recording and / or reproducing information by moving the recording medium in a radial direction, an elastic member for urging the power transmission member in the axial direction of the feed screw is provided. An information recording and / or reproducing apparatus characterized by the above-mentioned. 8. The power transmission member comprises a tubular feed nut fitted to the feed screw, and the elastic member is loosely fitted to the feed screw and at least one end is seated on the feed nut. 8. The information recording and / or reproducing apparatus according to claim 7, wherein the information recording and / or reproducing apparatus is made of a coiled or cylindrical elastic body. 9. The feed nut, comprising a combination of a first nut member and a second nut member divided in the axial direction of the feed screw, wherein the first nut member, the second nut member, 9. The device according to claim 8, wherein said elastic body is interposed therebetween to urge the members apart from each other in the axial direction.
An information recording and / or reproducing device according to the description. 10. A first cylindrical shaft portion extending in the axial direction is provided on one of the first nut member and the second nut member, and the other is fitted with the first cylindrical shaft portion. A first cylindrical shaft portion, a slit extending in the axial direction is provided on one of the first cylindrical shaft portion and the second cylindrical shaft portion, and a convex portion engaged with the slit is provided on the other. 10. The information recording and / or reproducing apparatus according to claim 9, wherein the first nut member and the second nut member are integrated in the rotation direction by engagement of the projection with the slit. 11. The elastic body comprises a coil spring. The coil spring is fitted to the first cylindrical shaft portion, and the coil spring is moved between the first nut member and the second nut member. 11. The information recording and / or reproducing apparatus according to claim 10, wherein the information recording and / or reproducing apparatus is interposed in a compressed state. 12. An output unit for extracting at least one of the first nut member and the second nut member as a driving force from a movement of the feed nut. An information recording and / or reproducing device according to the description.