JPH039184Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a disc player that reproduces information recorded on a recording surface of a compact disc or the like, and in particular, the present invention relates to a disc player that reproduces information recorded on a recording surface of a compact disc or the like. The present invention relates to a slider drive device for a disk player that is accurately engaged with a feed screw that drives a slider.

[Technical background]

A disc player that plays back information input on a recording surface of a compact disc, a magnetic disc, or the like has a built-in pick-up that reads the input information. The quality of the product is determined by the accurate and quick movement of the pick-up during rapid forwarding and the reading operation after stopping.
It is important for improving performance and functionality, and is also meaningful for ensuring product reliability.

[Prior art]

The operation of the conventional slider driving device for moving the pickup will be explained with reference to FIG. 4 (rear view), FIG. 5 (side view), and FIG. 6 (enlarged view of section A in FIG. 5).

When the compact disk 2 set on the turntable 1 rotates, a feed motor is driven in synchronization with this rotation, and a feed screw 7 connected to the feed motor rotates. A threaded portion 8a of a screw receiving member 8 is engaged with a threaded portion 7a screwed onto the feed screw 7. This screw receiving member 8 is attached to a slit 3a formed in the slider 3. Therefore, the slider 3 has a screw receiving member 8.
The rotational force of the feed screw 7 is transmitted as a linear force through the feed screw 7.

There are metal bushes 6a and 6 on both sides of the slider 3.
b is attached, and the main shaft 5a and subshaft 5b are inserted through this. Both shafts 5a and 5b are arranged parallel to the feed screw 7, and the slider 3 is supported by these shafts 5a and 5b and moves. During this movement, the optical pickup 4 mounted on the slider 3 reads and reproduces information recorded on the recording surface 2a of the compact disc 2.

[Problems with conventional technology]

However, the conventional slider driving device described above has the following problems.

(1) As shown in Figure 6, in slider 3,
A slight gap is formed between the slit 3a and the screw receiving member 8. Therefore, for example, after fast forwarding the slider 3, the feed screw 7
Even if the rotation of the slider 3 is slowed down, the slider 3 will protrude by the amount of the gap due to inertia. Furthermore, when the slider 3 is moved back after being moved forward, the screw receiving member 8 moves within the gap, and the backward movement of the slider 3 is delayed accordingly. As a result, a malfunction will occur in the reproduction operation of the optical pickup 4.

(2) Further, the back surface of the screw receiving member 8 is pressed by a leaf spring 9. Due to this pressing force, the backlash between the female threaded portion 8a of the screw receiving member 8 and the threaded portion 7a of the feed screw 7 is reduced.
This pressing force becomes a load on the feed motor.
Therefore, the feed motor not only becomes larger but also consumes more power.

(3) Further, when the screw receiving member 8 is pressed by the leaf spring 9, there is no gap between the threaded portion 7a and the female threaded portion 8a, and a pitch error occurs between the two threaded portions. They are fastened together and the slider cannot move smoothly.

[Purpose of this invention]

The present invention has been devised by focusing on the above-mentioned conventional problems, and provides a slider drive device for a disk player that does not cause backlash, reduces load resistance, and performs pickup playback quickly and accurately. is intended to provide.

[Structure of the present invention]

In the slider drive device according to the present invention, the chassis is provided with a motor for driving a disk, a guide shaft for slidably supporting the slider, and a feed screw parallel to the guide shaft, and a screw that engages with the feed screw. In the disk player in which the receiving member is attached to the slider, the screw receiving member includes a support shaft whose both ends are supported by the slider, and a pair of engaging members slidably inserted into the support shaft. A compression spring is interposed between the two engaging members, and each engaging member is formed with a protrusion that engages with the feed screw, and the side end surface of each engaging member is connected to the compression spring. It is characterized in that it is pressed into contact with the wall surface of the slider, and the driving force of the forward or reverse rotation of the feed screw is transmitted to the slider by either one of the pair of engagement members. This is something that is becoming more and more common.

[Example of the present invention]

Embodiments of the present invention will be described below with reference to the drawings of FIGS. 1 to 3.

Figure 1 is an enlarged sectional view of section B in Figure 2, Figure 1a,
FIG. 1b is an enlarged view of the main part of FIG. 1, FIG. 2 is a view taken along arrow C in FIG. 3, and FIG. 3 is a plan view of the main part of the disk player.

(Configuration of Example) Reference numeral 10 in the figure is a chassis. A spindle motor 11 is fixed to this chassis 10. A turntable 1 is fixedly installed above the spindle motor 11. A compact disc 2 is set on this turntable 1.

A large hole 10a is bored in the chassis 10. Main shafts 5 facing each other with the spindle motor 11 in between are located on both sides of this hole 10a.
a and a subshaft 5b are arranged. Both ends of the shafts 5a, 5b are fixed onto the chassis 10 via fasteners 12.

Reference numeral 13 is a slider. This slider 13
faces the hole 10a of the chassis 10. Further, metal bushes 1 are attached to shaft holders 13a and 13b formed at both ends of this slider.
4a and 14b are attached, and are inserted through the main shaft 5a and the subshaft 5b.

An optical pickup 4 is mounted on the slider 13. A lens barrel 4a projecting upward is provided at the center of the optical pickup 4, and an objective lens 4b is housed in this lens barrel 4a. This objective lens 4b is opposed to the recording surface 2a (see FIG. 4) of the compact disc 2 with a predetermined distance therebetween. The slider 13 is supported by both shafts 5a and 5b, and moves inside the hole 10a of the chassis 10 from the position indicated by the dashed-dotted line to the position indicated by the solid line shown in FIG. He can move freely between facing the out zone.

(Description of Features) As shown in FIG. 2, a U-shaped groove 13c that opens laterally is formed in the lower part of the shaft holder 13a formed on one side of the slider 10. The feed screw 7 is loosely inserted (see Figure 2). The feed screw 7 is disposed parallel to the main shaft 5a, and both ends thereof are rotatably supported on the chassis 10. A sliding plate 14 is interposed between the back surface of the feed screw 7 and the U-shaped groove 13c.

A notch 13d is provided on the upper surface of the U-shaped groove 13c.
is formed. The screw receiving member 15 is attached to this notch 13d. A support shaft 15a of this screw receiving member 15 is disposed parallel to the feed screw 7, and both ends thereof are supported by a wall surface 13e within the notch 13d. Furthermore, a pair of symmetrical engaging members 15b and 15c are slidably spline-fitted onto this support shaft 15a. In the radial direction of the engaging members 15b and 15c, there is a 1 extending in a helical direction.
A striped protrusion 15d is formed. This protrusion 15
d is engaged with the threaded portion 7a of the feed screw 7. Furthermore, the base portions 15e of the engaging members 15b, 15c are formed to have a small diameter. Compression springs 15 are attached to both bases 15e of the engaging members 15b and 15c.
f is interposed. The tip surfaces 15 of the engaging members 15b and 15c pressed by the compression spring 15f
g is pressed against the wall surface 13e of the notch 13d. In this state, the engaging members 15b and 15c
The pitch between the protrusions 15d formed on the feed screw 7 is set to be a positive multiple of the pitch of the threaded portion 7a of the feed screw 7. Furthermore, this protrusion 15d has a cross-sectional shape symmetrical to that of the threaded portion 7a.

Further, the feed screw 7 is connected via a belt 18 to a feed motor 17 fixed to the chassis 10. This feed motor 17 rotates in synchronization with the spindle motor 11.

(Operation of the Embodiment) Next, the operation of the disc player with the above configuration will be explained.

The slider 13 in its initial state is at the position indicated by the dashed line in FIG. At this time, the objective lens 4b of the optical pickup 4 faces the lead-in zone of the compact disc 2.

In the reproduction operation, first, the spindle motor 11 is driven, and the compact disc 2 set on the turntable 1 is rotated. At the same time slider 13
A feed motor 17 that drives the spindle motor 11 rotates in synchronization with the spindle motor 11. This feed motor 1
The driving force of 7 is transmitted to the feed screw 7 via the belt 18. The rotational force of the feed screw 7 is transmitted to the slider 13 via the screw receiving member 15.

The slider 13 has metal bushes 14 on shaft holders 13a and 13b formed on both sides thereof.
The main shaft 5 inserted through a and 14b
a and the subshaft 5b, and move toward the lead-out zone of the compact disc 2. At this time, the slider 13 moves with the main shaft 5a as a reference.

During this time, the information recorded on the recording surface 2a of the compact disc 2 is read by the optical pickup 4 and then reproduced. When the objective lens 4b reaches the lead-out zone of the compact disc 2 (the position indicated by the solid line in FIG. 3), the reproducing operation ends.

When the slider 13 moves toward the lead-out zone of the compact disk 2, the feed screw 7 is in a normal rotation state, and the threaded portion 7a of the feed screw 7 advances in the direction of the arrow shown in FIG. 1a. Then, the protrusion 15d formed on the engagement member 15c of the screw receiving member 15 is pressed against one slope of the threaded portion 7a. Then, the distal end surface 15 of the engaging member 15c
g presses the wall surface 13e formed in the notch 13d of the slider 13, and moves the slider 13.

To return the slider 13 to its initial position, the feed screw 7 is reversed. Then, as shown in FIG. 1b, one slope of the threaded portion 7a presses the other engaging member 15b. At this time, the distal end surface 15g of the engagement member 15b is connected to the compression spring 15.
Since the slider 13 is in contact with the wall surface 13e of the slider 13 by the angle f, the slider 13 quickly slides back.

In addition, if there is an error in the pitch of the threaded portion 7a of the feed screw 7, the compression spring 15
Since the distance between the engaging members 15b and 15c is adjusted by the elastic force f, the threaded portion 7a is not fastened between the protrusions 15d.

(Modification) Support shaft 15 of the screw receiving member 15 in the illustrated embodiment
a and the engaging members 15b, 15c are spline-fitted, but since a small torque is sufficient to move the slider 13, the protrusion 15d of the engaging member 15b, 15c and the screw of the feed screw 7 that presses it. Since there is low friction between the engaging member 15 and the portion 7a,
Even if b and 15c are rotatably mounted, they do not rotate due to the frictional force between the tip end surface 15g and the wall surface 13e, and the driving torque is sufficiently transmitted.

Furthermore, the slider driving device according to the present invention can also be applied to magnetic recording and reproducing devices.

[Effects of this invention]

As described above, according to the present invention, the following effects can be achieved.

(1) In the screw receiving member attached to the slider, both ends of the support shaft are supported by the slider, and a pair of engaging members are slidably inserted into the support shaft, and a compression spring is interposed between each engaging member. The distal end surface of each engaging member is pressed against the wall surface of the slider, and each engaging member is formed with a protrusion that engages with the feed screw, so that the feed screw is connected to one side. Since only the protrusion formed on the engagement member is pressed, the number of sliding parts is reduced.
The load resistance becomes extremely small, and the driving torque of the feed screw can be significantly reduced compared to the conventional method.

Therefore, the feed motor that drives the feed screw can be made smaller, the energy consumption rate is lower, and the entire apparatus can be made more compact.

(2) Also, since the tip end surface of each engaging member is always in contact with the wall surface of the slider by the compression spring,
No bumps occur between the two when the feed screw is started or during fast forwarding. Therefore, the slider can be moved quickly and the pick-up reading operation can be started quickly. Furthermore, even if the feed screw suddenly stops, the slider will not stick out due to inertia, and even if it moves back immediately after moving forward, there will be no movement delay due to play between the screw receiving member and the slider. will not occur. Therefore, highly accurate reproduction operation can be performed.

(3) Furthermore, since each engaging member is only pressed in the axial direction by a compression spring, even if there is an error between the pitches of the feed screw, there will be no difference between the protrusions formed on each engaging member. Therefore, the screw pitch of the feed screw is never tightened, and movement of the slider is not hindered.

[Brief explanation of drawings]

1 to 3 show an embodiment of the present invention, and FIG. 1 is an enlarged sectional view of section B in FIG. 2, and FIG.
1b is a partial enlarged view of FIG. 1, FIG. 2 is a view taken in the direction of arrow C in FIG. 3, FIG. 3 is a plan view of the main part of a disk player, and FIG. 4 is a rear view of essential parts of the disk player, FIG. 5 is a right side view of FIG. 4, and FIG. 6 is an enlarged sectional view of section A of FIG. 5. 2... Disk, 5a, 5b... Guide shaft, 7... Feed screw, 10... Chassis,
11...Motor, 13...Slider, 13e...
Wall surface, 15... Screw receiving member, 15a... Support shaft, 1
5b, 15c...Engaging member, 15d...Protrusion, 1
5e...Compression spring, 15g...Tip surface.

Claims (1)

[Scope of utility model registration request] The chassis includes a motor that drives the disk, and a guide shaft that slidably supports the slider.
In a disk player in which the guide shaft is provided with a feed screw parallel to the guide shaft, and a screw receiving member that engages with the feeding screw is attached to the slider, both ends of the screw receiving member are supported by the slider. Consisting of a support shaft, a pair of engagement members slidably inserted through the support shaft, and a compression spring interposed between the two engagement members to press each engagement member against the wall surface of the slider, A slider drive device for a disk player, wherein each of the engaging members is formed with a protrusion that engages with the feed screw.