JP3189852B2 - Information recording / reproducing means feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording / reproducing apparatus provided in an information recording / reproducing apparatus such as a CD player for recording or reproducing information such as images and sounds on a recording surface of a rotating recording disk. It relates to a means feeding device.

[0002]

2. Description of the Related Art An information recording / reproducing means (optical head, magnetic head, etc.) of an information recording / reproducing apparatus such as a CD player is rotating while moving in the radial direction of a recording disk by an information recording / reproducing means feeding device. Information such as images and sounds is recorded or reproduced on the recording surface of the disc.

An information recording / reproducing means feeding device for moving an information recording / reproducing means in a radial direction of a recording disk is usually of a type using a feed screw rod which rotates in a forward / reverse direction.

FIGS. 7 and 8 show the configuration of a conventional information recording / reproducing means feeding device provided in an information recording / reproducing device such as a CD player. FIG. 7 is a plan view, and FIG. 8 is a side view.

The information recording / reproducing means 1 is supported at one end by a feed screw rod 2 rotatable in forward and reverse directions, and at the other end by a non-rotatable reference shaft (guide shaft) 3. In both the feed screw rod 2 and the reference shaft 3, the information recording / reproducing means 1 is arranged in the radial direction of the recording disk (not shown)
b) so that the information recording / reproducing means 1
Through holes 1A and 1B.

At one end of the information recording / reproducing means 1, a leaf spring 5 having a half nut 4 screwed with a screw portion of the feed screw rod 2 is attached by a bolt 6. The half nut 4 is urged toward the feed screw rod 2 by the spring force of the leaf spring 5, and is screwed to the screw portion with a pressure that does not hinder the rotation of the feed screw rod 2.

In such a conventional information recording / reproducing means feeder, when the feed screw rod 2 is rotated forward or backward by a feed motor (not shown), information is recorded / reproduced on the feed screw rod 2. Since the half nut 4 on the unit 1 side is screwed, the information recording / reproducing unit 1 moves in the radial direction of the recording disk while being guided by the reference shaft 3. Then, the information recording / reproducing means 1 which moves in the radial direction of the recording disk due to the rotation of the feed screw rod 2 becomes uncontrollable for some reason, and reaches the inner movement limit position or the outer movement limit position (not shown). When the feed screw rod 2 continues to rotate, the urging force of the leaf spring 5 pressing the half nut 4 loses the rotational thrust of the screw thread of the feed screw rod 2. For this reason, the half nut 4 floats up from the feed screw rod 2, and the feed screw rod 2 enters an idle state, thereby preventing the feed screw rod 2 from biting into the half nut 4.

[0008]

However, as in the above-mentioned conventional information recording / reproducing means feeder, the nut screwed into the feed screw rod 2 is a half nut 4 provided in a leaf spring 5. In the case of the structure, even when an impact due to drop or the like is applied to the information recording / reproducing device, the half nut 4 screwed with the feed screw rod 2 rises up from the feed screw rod 2 to be unscrewed. turn into. At this time, since the information recording / reproducing means 1 moves rapidly, there is a disadvantage that the half nut 4 and the like are damaged by interference or collision.

Therefore, the present invention has been made in view of the above-mentioned circumstances, and even after the information recording / reproducing means reaches the inner movement limit position or the outer movement limit position, the feed screw rod continues to rotate. There is no biting between the screw rod and nut for
It is another object of the present invention to provide an information recording / reproducing means feeding device in which the screw rod for feeding and the nut do not unscrew even if an impact due to drop or the like is applied to the information recording / reproducing device.

[0010]

SUMMARY OF THE INVENTION The present invention provides an information recording / reproducing means for recording / reproducing information on / from a recording surface of a rotating recording disk in a radial direction of the recording disk. The present invention relates to an information recording / reproducing means for moving by using a feed device.

In order to achieve the above object, the information recording / reproducing means feeding device of the present invention is arranged such that the information recording / reproducing means is screwed to the feeding screw rod via a nut having a circumferential thread. Together with the feed screw rod,
In each of the portions corresponding to the inner movement limit position and the outer movement limit position of the information recording / reproducing means, an annular groove for screwing the thread of the nut from the screw portion of the feed screw rod is provided . For the regenerating means,
A screw rod through hole for passing
The above nut can move in the axial direction and cannot rotate
Left and right that are elastically deformed in the axial direction.
It is characterized by being held by a rubber ring as an elastic member .

[0012]

Further, the information recording / reproducing means is urged outward or inward by a return spring when the information recording / reproducing means is at the inner movement limit position or the outer movement limit position.

[0014]

In the information recording / reproducing means feeding device having the above structure, when the feed screw rod is rotated, the information recording / reproducing means screwed to the feed screw rod via a nut in the radial direction of the recording disk. Move within a predetermined range. Then, when the rotation of the feed screw rod continues until the information recording / reproducing means reaches the inner movement limit position or the outer movement limit position, the thread of the nut screwed with the screw portion of the feed screw rod is fed. It is unscrewed from the screw part of the screw rod for feeding and is fitted into the annular groove of the screw rod for feeding. Therefore, the feed screw rod which continues to rotate thereafter is in an idle state in which it is not screwed with the nut.

As a result, the information recording / reproducing means, which is normally controlled to move within a predetermined range between the inner movement limit position and the outer movement limit position, becomes uncontrollable for some reason, and the inner movement limit. Even when reaching the limit position or the outer movement limit position, the feed screw rod that continues to rotate does not bite into the nut.

Further, the nut fitted into the threaded rod through-hole is provided with a rotation of the thread of the screw rod for feeding which is continuously rotated even after the information recording / reproducing means reaches the inner movement limit position or the outer movement limit position. The thrust moves the screw ring through hole while compressing one rubber ring or the return spring.

By this movement of the nut, the thread of the nut is screwed off from the threaded portion of the feed screw rod and fitted into the annular groove of the feed screw rod. At this time, the thread of the nut compressing one of the rubber rings or the return spring comes into contact with the end face of the thread of the feed screw rod. As a result, the thread of the nut fitted in the annular groove smoothly engages with the thread when the feed screw rod rotates in the opposite direction.

The nut screwed into the feed screw rod has a circumferential thread. Thus, even if an impact due to a drop or the like is applied to the information recording / reproducing apparatus, the screw rod and the nut that are screwed together will not be unscrewed.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

<Embodiment 1> FIG. 1 shows an overall configuration of a CD player provided with an information recording / reproducing means feeding device according to Embodiment 1 of the present invention, and FIG. 2 shows an information recording / reproducing means feeding device in the same CD player. The configuration is shown.

At the center of the CD player main body 11, a disk drive motor 13 for rotating and driving the recording disk 12 is provided.
The information recording / reproducing means 1 for recording or reproducing information on the recording surface of the rotating recording disk 12
4 are installed.

The disk drive motor 13 and the information recording / reproducing means 14 are mounted on a mounting base 15 of the CD player main body 11. The information recording / reproducing means 14 is supported by a feed screw rod 16 and a reference shaft 17 in a parallel state in an opening 15A formed in the mounting base 15. The feed screw rod 16 is rotatably mounted on the mounting base 15, and the reference shaft 17 is mounted on the mounting base 1.
5 is mounted non-rotatably.

The feed screw rod 16 is provided for the information recording / reproducing means 1.
4 is screwed with a nut portion 18 formed integrally on one end side. The nut portion 18 has a circumferential thread 18A shown in FIG.

An annular groove 16 for screwing the thread 18A of the nut portion 18 from the threaded portion 16A of the feed screw rod 16 is provided at both left and right ends of the screw portion 16A of the feed screw rod 16.
B and 16C are formed (see FIG. 3). Each annular groove 1
6B and 16C are smaller in diameter than the root diameter of the screw portion 16A.

As shown by the solid line in FIG. 2, when the information recording / reproducing means 14 moves to the outer movement limit position (X1 position) where it comes into contact with the outer end surface of the opening 15A, the thread 18A of the nut portion 18 becomes the threaded portion. It is unscrewed from 16A and fitted into annular groove 16B. At this time, the information recording / reproducing means 14 is urged inward by a return spring (coil spring) 19 installed on the mounting base 15. For this reason,
The thread 18A of the nut 18 contacts the end surface of the thread 16A.

As shown by the imaginary line in FIG. 2, when the information recording / reproducing means 14 moves to the inner movement limit position (X2 position) in contact with the inner end face of the opening 15A, the nut 1
The thread 18A of No. 8 is unscrewed from the threaded portion 16A to form the annular groove 1A.
Fit into 6C. At this time, the information recording / reproducing means 14
Is urged outward by a return spring 20 installed on the mounting base 15. For this reason, the thread 18A of the nut 18 comes into contact with the end face of the thread 16A.

When the information recording / reproducing means 14 is located within the normal feed range between the X1 position and the X2 position, the screw portion 18A of the nut portion 18 becomes the screw portion 16A of the feed screw rod 16.
Is screwed.

The rotation of the feed motor 21, which can be rotated forward and backward, is transmitted to the feed screw rod 16 via gears 31 and 32. Accordingly, when the feed screw rod 16 rotates at the start of rotation of the feed motor 21, the information recording / reproducing means 14 moves in the radial direction of the recording disk 12 (the directions of arrows a and b). At this time, the information recording / reproducing means 14 is normally controlled to move within a predetermined range between the X1 position and the X2 position. During this moving process, the information recording / reproducing means 14 records or reproduces information on the recording surface of the rotating recording disk 12. When the information recording / reproducing means 14 reaches the X1 position or the X2 position following the rotation of the feed screw rod 16 for some reason, the screw thread 18A of the nut portion 18 is fed as described above. Threaded from the threaded portion 16A of the threaded screw rod 16 to form annular grooves 16B, 16B.
Fit into C. Therefore, the feed screw rod 16 that continues to rotate is in an idling state in which the nut portion 18 is not screwed.

On the other hand, when the feed screw rod 16 rotates in the opposite direction in a state where the thread 18A of the nut 18 is fitted in the annular grooves 16B and 16C of the feed screw rod 16, the thread 18A of the nut 18 is rotated. Is screwed with the screw portion 16A, so that the information recording / reproducing means 14 moves in the radial direction of the recording disk 12.

<Embodiment 2> FIG. 4 shows the configuration of an information recording / reproducing means feeder according to Embodiment 2 of the present invention. In the present information recording / reproducing means feeding device, the nut portion 18 of the information recording / reproducing means feeding device of the first embodiment is changed as follows. That is, as shown in FIG. 6, a screw rod through hole 33 for passing the feed screw rod 16 is provided in one end housing portion of the information recording / reproducing means 14, and the screw rod through hole 33 is provided.
Nut member 34 having a circumferential thread 34A therein.
And rubber rings (elastic members) 35 and 36 which are arranged on both the left and right sides thereof and elastically deform in the axial direction.

The nut member 34 is inserted into the screw rod through hole 33.
It is fitted so that it can move in the axial direction and cannot rotate. Rubber rings 35, 36 for holding the nut member 34 from both right and left sides are provided with an end wall 37 formed at one end of the screw rod through hole 33 and a bolt 38 on the information recording / reproducing means 14.
The position is fixed in the axial direction with the end plate 39 fixed by.

Screw hole through hole 33 of information recording / reproducing means 14
The thread 34A of the nut member 34 attached inside is
The information recording / reproducing means 14 is at the outer movement limit position (X1 position)
When it is located in the normal feed range between the inner feed limit position (X2 position) and the inner movement limit position (X2 position), as shown in FIG. Has become. At this time, the nut member 34 is in a state where the right and left rubber rings 35 and 36 are not pressed.

Then, it becomes out of control for some reason,
If the feed screw shaft 16 continues to rotate even after the information recording / reproducing means 14 has reached the X1 position or the X2 position, the thread 1
The nut member 34 moves while compressing one of the rubber rings 35 and 36 (the left rubber ring 35 in the X1 position, and the right rubber ring 36 in the X2 position) by the rotational thrust of the 6A thread. And the thread 34A has the annular groove 16
B, 16C. Therefore, the feed screw shaft 16
Even if the rotation continues, since the nut member 34 is unscrewed from the screw portion 16A, the feed screw shaft 16 is idle.

As described above, the thread 34 of the nut member 34
When A is fitted into the annular grooves 16B, 16C, the nut member 34 compresses one of the rubber rings 35, 36, so that the thread 34A is in contact with the end face of the threaded portion 16A. Therefore, when the feed screw shaft 16 rotates in the opposite direction in a state where the thread 34A of the nut member 34 is fitted in the annular grooves 16B and 16C, the nut member 34 is rotated.
Is smoothly screwed into the screw portion 16A of the feed screw shaft 16.

In the present information recording / reproducing means feeding device,
The left and right rubber rings 35, 36 attached in the screw rod through holes 33 of the information recording / reproducing means 14 are similar to the left and right return springs 19, 20 of the information recording / reproducing means 14 of the first embodiment, respectively. The nut member 34 that has been unscrewed from the 16 screw portions 16A plays a role of smoothly screwing into the screw portion 16A again.

The right and left rubber rings 35, 36 for holding the nut member 34 in the screw rod through hole 33 of the information recording / reproducing means 14 can be replaced by coil springs or the like.

[0037]

As described above, according to the information recording / reproducing means feeding device of the present invention, the information recording / reproducing means becomes uncontrollable for some reason and reaches the inner moving limit position or the outer moving limit position. Then, the thread of the nut of the information recording / reproducing means, which is screwed with the screw part of the feed screw rod, is fitted into the annular groove provided in the feed screw rod, and the nut is screwed from the screw part of the feed screw rod. Since it is detached, even if the feed screw rod continues to rotate, it does not bite into the nut.

Further, since the nut has a circumferential thread, even if an impact such as a drop is applied to the information recording / reproducing apparatus, the screw rod for feeding and the nut will not be unscrewed. Therefore, parts such as nuts are not damaged by interference or collision due to sudden movement of the information recording / reproducing means.

Further, the left and right sides of a nut mounted in the screw rod through hole of the information recording / reproducing means so as to be axially movable and non-rotatably are clamped by elastic members and further urged by urging means. Therefore, when the nut screwed off from the screw portion of the feed screw rod is screwed again to the screw portion of the feed screw rod, the screw thread of the nut is smoothly screwed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an overall configuration of a CD player provided with an information recording / reproducing means feeding device according to Embodiment 1 of the present invention.

FIG. 2 is a cross-sectional plan view showing a configuration of an information recording / reproducing means feeding device in the CD player.

FIG. 3 is a perspective view showing a configuration of a nut portion and a feed screw rod of the information recording / reproducing means feed device.

FIG. 4 is a cross-sectional plan view showing a configuration of an information recording / reproducing means feeding device according to a second embodiment of the present invention.

FIG. 5 is a cross-sectional plan view showing a threaded state of a nut member and a feed screw rod of the information recording / reproducing means feed device.

FIG. 6 is an exploded perspective view showing a mounting structure of a nut member in the information recording / reproducing means feeding device.

FIG. 7 is a plan view showing a configuration of a conventional information recording / reproducing means feeding device.

FIG. 8 is a side view showing a configuration of the information recording / reproducing means feeding device.

[Explanation of symbols]

 Reference Signs List 12 recording disk 14 information recording / reproducing means 16 feed screw rod 16A screw part 16B, 16C annular groove 18 nut part (nut) 18A nut part screw thread 33 screw rod through hole 34 nut member (nut) 34A nut member screw member 35, 36 Rubber ring (elastic member) X1 Outside movement limit position X2 Inside movement limit position

Claims (2)

(57) [Claims] 1. A information to the recording surface of the recording disk is rotating recording or information recording and reproduction means for reproducing, in the radial direction of the recording disc, the information is moved with the feed screw rod in the recording reproducing unit feeder, the information recording and reproducing means, with respect to the feed screw rod,
Via a nut having a circumferential thread screwed, the feed screw rod, each portion corresponding to the inner movement limit position and an outer limit position of the information recording and reproducing means, the nut thread and an annular groove for causing unscrewed from the threaded portion of the feed screw rod is provided, the above-mentioned information recording and reproducing means is passed through the feed screw rod
Female screw rod through hole is provided, and the nut moves in the axial direction in the screw rod through hole.
Fits in a non-rotatable and non-rotatable
An information recording / reproducing means feeding device which is sandwiched between left and right elastic members which are elastically deformed . Wherein said information recording means, when in the inner movement limit position or outside the movement limit position, and further comprising biasing means for biasing said information recording and reproduction means outside or inside The information recording / reproducing means feeding device according to claim 1.