JP3170226B2 - Sound skipping device for CD players - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound skipping prevention device for a CD player which prevents sound skipping when a strong external shock or a vertical vibration is applied during a reproducing operation.

[0002]

2. Description of the Related Art In order to cope with external vibrations, a CD player generally mounts a support member to which a motor and a pickup are mounted on a chassis in a state of being suspended via a buffer member. The rotating shaft of the motor is disposed substantially vertically, and a turntable is fixed to the rotating shaft. And
Hold the disc between the turntable and the clamper,
The turntable is rotated by a motor to reproduce information recorded on the disk.

[0003] The disk clamping force of the turntable and the clamper is generally determined by utilizing the elastic force of a spring, or attaching a magnet to one of the turntable and the clamper and a magnetic body to the other, to determine the magnetic force generated between the two. I use it. By the way, the rotation axis of the motor is
It can move slightly in the axial direction. The rotating shaft is normally fixed at the lowermost position by gravity, but the following problems occur when a strong shock or vertical vibration is applied from the outside.
That is, since the support member is attached to the chassis via the cushioning member, for example, when subjected to vertical vibration,
The support plate vibrates up and down with respect to the chassis with the motor, turntable, clamper, disk and pickup. The motor and the pickup always move up and down integrally with the support plate, but the turntable, the clamper and the disk move up and down integrally with the rotating shaft of the motor. Thus, once the raised support member turns to descend, the rotating shaft of the motor moves upward with respect to the motor as if thrown upward so as to be able to move in the axial direction. As a result, if the distance between the recording surface of the disc and the pickup rapidly increases, and if the focus control of the pickup cannot follow the change in the distance, the reproduction signal is interrupted, and so-called "jumps" occur.

In the structure in which the disk is held by the elastic force of the spring, the spring always applies a downward elastic force to the clamper during the reproducing operation, so that the contact friction between the clamper and the spring causes the friction when the motor rotates. Although there is a disadvantage in terms of load, the occurrence of “sound skip” is relatively small. This is because the rotating shaft is always pressed by the spring. In this regard, in the structure in which the disk is clamped by magnetic force, the load during rotation of the motor is small, but the force to push down the rotating shaft is only the gravity of the turntable, clamper, disk and rotating shaft itself and the magnetic force between the rotor and stator of the motor. Therefore, there is a problem that "jumps" are likely to occur when subjected to an external shock or vibration.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the foregoing circumstances, and has a motor and a pickup mounted on a common support member with the rotation axis of the motor oriented substantially vertically. The turntable is fixed to the chassis, the support member is mounted on the chassis via a buffer member, and the disc is clamped between the turntable and the clamper by a magnetic force. It is an object of the present invention to provide a sound skipping prevention device for a CD player that can prevent the occurrence of sound skipping even when the sound is received.

[0006]

According to the present invention, there is provided a sound skipping prevention device for a CD player in which a stopper means having elasticity is arranged at a position above a clamper, and a disc is held between the turntable and the clamper. The stopper means applies a downward elastic force to the clamper only when the support member to which the motor and the pickup are mounted moves above the neutral position of the buffer member. With such a configuration, even if a strong shock or vertical vibration is applied from the outside during the reproducing operation, when the support member moves upward, the stopper means exerts an elastic force to push the rotating shaft downward. The rotation shaft is prevented from moving upward with respect to the motor. Accordingly, the distance between the recording surface of the disc and the pickup does not change, and the occurrence of sound skipping can be prevented. Further, when the support member is at the neutral position, the stopper means does not apply an elastic force to the clamper, or applies only a very small elastic force to the clamper. Therefore, providing the stopper means increases the load on the motor. No fear.

If the stopper means is provided especially on the chassis side, the installation position, material, shape and the like of the stopper means can be selected relatively freely, so that the design is easy. It is also possible to provide the stopper means on the clamper side. In this case, the installation position and shape of the stopper means should be considered so as not to hinder the rotational balance of the clamper. In particular,
If the clamper is made of a synthetic resin, the stopper member can be molded integrally with the clamper to reduce the number of parts and simplify the configuration. When a metal leaf spring is used as the stopper member, the material can be easily selected, so that an optimal elastic force can be obtained.

[0008]

FIG. 1 shows the appearance of a CD player mounted on a vehicle. In the figure, reference numeral 1 denotes a chassis made of a metal plate having an upper plate, left and right side plates and a back plate. A front block 3 made of a synthetic resin having a disk insertion slot 2 is attached to the front end of the chassis 1. On the upper surface of the chassis 1, a pair of left and right clamper lifting plates 4a, 4b and disk guides 5a,
5b is mounted. The clamper lifting plates 4a and 4b engage the inner ends thereof with the clamper 6, and move up and down to move the clamper 6 up and down. However, during the reproducing operation, the clamper lifting plates 4a and 4b are separated from the clamper 6. The disk guides 5a and 5b rotate horizontally in conjunction with the up and down rotation of the clamper elevating plates 4a and 4b to guide the disk 7 inserted from the disk insertion slot 2 to the reproducing operation position, or the disk in the reproducing operation position. 7 is pushed back through the disc insertion slot 2 to the outside. A clamper cover 8 is mounted on the upper surface of the chassis 1 so as to cover the clamper 6. An eject lever 9 for taking out a disk is mounted on the side of the chassis 1 so as to be able to move forward and backward. A push button is attached to the end of the eject lever 9, but is omitted in the drawing.

FIG. 2 is a schematic vertical sectional view of the CD player, but the clamper cover 8 is omitted. In the figure, reference numeral 10 denotes a lifting plate. The lifting plate 10 is, for example, a link mechanism (not shown).
And is at the lowered position when the disk 7 is inserted / removed, and at the raised position during the reproducing operation. A support member 12 is mounted on an upper surface of the lifting plate 10 via a buffer member 11. The cushioning member 11
Even if the chassis 1 and the elevating plate 10 receive shocks and vibrations from the outside, they absorb the shocks and vibrations and prevent the shocks and vibrations from being directly transmitted to the support member 12. It consists of.

A motor 13 is fixed to the lower surface of the support member 12. The rotating shaft 14 of the motor 13 is disposed substantially vertically, protrudes toward the upper surface of the support member 12, and has a turntable 15 fixed to the upper end. The turntable 15
It is located directly below the clamper 6. The support member 12
, A pickup 16 is mounted movably in parallel with the recording surface of the disk 7. The rotating shaft 14 and the rotor 17 fixed thereto can move slightly in the axial direction with respect to the stator 18 in the motor 13, but are usually at the lowest position due to gravity and the magnetic force between the rotor 17 and the stator 18. ,
The lower end of the rotating shaft 14 is in contact with the thrust bearing 19 of the motor 13.

A metal leaf spring 20 as a stopper is mounted on the upper surface of the chassis 1. The elastic force of the leaf spring 20 is much weaker than the elastic force of the buffer member 11. The leaf spring 20 has one end fixed to the chassis 1 at a position below the clamper cover 8 and a free end positioned above the clamper 6. At the center of the upper surface of the clamper 6, a small protrusion 21 is provided so as to protrude therefrom.
Whether the free end of the leaf spring 20 slightly contacts the small projection 21;
Alternatively, a slight gap is provided between the free end of the leaf spring 20 and the small protrusion 21.

The clamper 6 has an annular permanent magnet 22.
Is mounted, and a circular concave portion 2 is formed on the inner side of the
It is set to 3. Further, the turntable 15 has a bulging portion 24 at the center of the upper surface, which fits into the circular concave portion 23 of the clamper 6 through the center hole of the disk 7, and an annular magnetic body 25 around the bulging portion 24. Is installed. The turntable 15 and the clamper 6 include the permanent magnet 22 and the magnetic body 2.
The disk 7 is held by the magnetic force generated between the disk 7 and the disk 5.

In the CD player constructed as described above, when the disc is not inserted, as shown in FIG. 3, the lifting plate 10 is at the lowered position together with the support member 12 and the turntable 15, and the clamper 6 is provided with the clamper lifting plates 4a and 4b. Is held in the raised position. In this state, when the disc 7 is inserted from the disc insertion slot 2, the disc guide 5a,
5b operates to retract the disk 7. When the disk 7 reaches the reproducing operation position, the clamper lift plate 4
a and 4b lower the clamper 6 in conjunction with the disk guides 5a and 5b.

At the same time, the lift plate 10 is raised, and the bulging portion 24 of the turntable 15 is fitted into the circular recess 23 of the turntable 15 through the center hole of the disk 7, and the turntable 15 and the clamper 6 are connected as shown in FIG. To hold the disk 7. The disk 7 is clamped between the turntable 15 and the clamper 6 by a magnetic force generated between the magnet and the magnetic body. Then, the motor 13 is started, the turntable 15 is rotated, the pickup is operated, and the information recorded on the disk 7 is reproduced. At this time, since the leaf spring 20 slightly contacts the small projection 21 of the clamper 6 or is slightly separated from the small projection 21, the rotational load of the motor 13 increases due to the contact friction between the leaf spring 20 and the clamper 6. There is no danger.

When ejecting the disc 7 after the end of the reproducing operation, the eject lever 9 is pushed in. Then, the motor stops, and the clamper lifting plates 4a, 4b rotate upward to raise the clamper. At the same time, the elevating plate 10 descends to separate the turntable 15 from the disk 7. The disk guides 5a and 5b rotate horizontally in conjunction with the upward rotation of the clamper elevating plates 4a and 4b, and push the disk 7 outward from the reproducing operation position.

In the reproducing operation state shown in FIG. 2, when the chassis 1 receives an external shock or vertical vibration due to the running of the vehicle, the shock or vibration is absorbed by the cushioning member 11 and the shock Transmission is eased. However, when the impact or the vibration is strong, a part of the vibration is also transmitted to the support member 12. When the support member 12 that has once risen turns to descend, the rotation shaft 14 and the rotor 17 of the motor 13 move upward with the turntable 13, the disk 7, and the clamper 6 with respect to the motor 13, the support plate 12, and the chassis 1. Try to move to However, when the clamper 6 attempts to move upward with respect to the chassis 1, the small protrusion 21 of the clamper 6 pushes up the free end of the leaf spring 20, so that the clamper 6 receives a reaction force from the leaf spring 20.
Therefore, the rotating shaft 14, the rotor 17, the turntable 1
The elastic force of the leaf spring 20 acts on the disc 3 and the clamper 6 downward. Even if the elastic force is extremely small, the axial movement of the rotating shaft 14 with respect to the motor 13 can be reliably prevented.

When the rotating shaft 14 is to move downward with respect to the chassis 1, the small projection 21 of the clamper 6 separates from the leaf spring 20 as shown in FIG. Therefore, the leaf spring 2
Zero elastic force does not act on the rotating shaft 14. As described above, according to the sound skip prevention device configured as described above, even when a strong shock or vertical vibration is applied from the outside during the reproducing operation, the rotating shaft 14 moves upward with respect to the motor 13. Therefore, the distance between the recording surface of the disk 7 and the pickup 16 does not change, and the occurrence of sound skipping can be prevented. When the support member 12 is in the neutral position by the buffer member 11, the leaf spring 20 does not apply an elastic force to the clamper 6 or applies only a very slight elastic force. Thus, there is no danger that the load on the motor 13 will increase.

In the above embodiment, since the metal leaf spring 20 as the stopper means is provided particularly on the chassis 1 side, the installation position, material, shape and the like of the leaf spring 20 can be selected relatively freely. Therefore, the design is easy, but it is also possible to provide the stopper means on the clamper side. FIG.
An embodiment in which the stopper means is integrally molded with a synthetic resin clamper is shown. That is, the synthetic resin clamper 31 is formed in a substantially cylindrical shape, the inner periphery is fitted to the bulging portion 24 of the turntable 15, and the elastic piece 32 as stopper means is integrated with the upper end of the inner periphery. Mold.
The elastic piece 32 extends substantially horizontally from the upper end of the inner periphery of the turntable 15 to the center thereof.
To protrude. The support member 12 is used as the buffer member 1.
In the state where the small projection 33 is stationary at the neutral position,
Is slightly contacted with the lower surface of the clamper cover 8 fixed to the chassis 1 or a small gap is provided between the small projection 33 and the clamper cover 8.

According to the above embodiment, similarly to the embodiment of FIGS. 1 to 4, the upward movement of the rotating shaft 14 with respect to the motor 13 can be prevented, and the occurrence of sound skipping can be prevented. In addition, by forming the elastic piece 32 (stopper member) integrally with the synthetic resin clamper 31, the number of parts can be reduced and the configuration can be simplified. Note that the present invention is not limited to the embodiment shown here. For example, a magnet may be mounted on the turntable side, and a magnetic body may be mounted on the clamper side. The cushioning member is not limited to the coil spring, but may be any member having a cushioning function of preventing shocks and vibrations applied to the chassis from being directly transmitted to the support member.

[0020]

According to the present invention, the motor and the pickup are mounted on a common support member with the rotation axis of the motor oriented substantially vertically, and a turntable is fixed to the rotation shaft. In a CD player in which the disc is clamped by a turntable and a clamper by magnetic force, an elastic stopper means is arranged above the clamper, and the disc is clamped between the turntable and the clamper. In the above, only when the supporting member to which the motor and the pickup are attached is moved upward from the neutral position by the cushioning member, the stopper means applies a downward elastic force to the clamper.
Even if a strong shock or vertical vibration is applied from the outside during the reproducing operation, when the support member moves upward, the stopper means exerts an elastic force for pushing the rotating shaft downward.

Accordingly, the rotation shaft is prevented from moving upward with respect to the motor, the distance between the recording surface of the disk and the pickup does not change, and the occurrence of sound skipping can be prevented. Further, when the support member is at the neutral position, the stopper means does not apply an elastic force to the clamper, or applies only a very small elastic force to the clamper. Therefore, providing the stopper means increases the load on the motor. No fear.
When the stopper means is provided on the chassis side in particular, the installation position, material, shape and the like of the stopper means can be selected relatively freely, so that the design becomes easy. It is also possible to provide the stopper means on the clamper side, provided that the installation position, shape, etc. of the stopper means do not hinder the rotational balance of the clamper. In particular, if the clamper is made of a synthetic resin, the stopper member can be molded integrally with the clamper to reduce the number of components and simplify the configuration. When a metal leaf spring is used as the stopper member, the material can be easily selected, so that an optimal elastic force can be obtained.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a vehicle-mounted CD player showing an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of the CD player.

FIG. 3 is a longitudinal sectional view showing the CD player in a state where a disc is not inserted.

FIG. 4 is a longitudinal sectional view showing a state where the CD player is subjected to external vibration.

FIG. 5 is a longitudinal sectional view of a CD player showing another embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 chassis 6, 31 clamper 7 disk 11 buffer member 12 support member 13 motor 14 rotating shaft 15 turntable 16 pickup 20, 32 stopper means 22 magnet 25 magnetic body

Claims (3)

(57) [Claims] 1. A motor and a pickup are mounted on a common support member with a rotating shaft of a motor oriented substantially vertically, and a turntable is fixed to the rotating shaft. The support member is mounted on the chassis (1) in a state of being floated via the buffer member (11), and the magnet (2) is attached to one of the turntable and the clampers (6, 31) disposed above the turntable.
2) On the other side, a magnetic body (25) is mounted, and a CD player for generating a magnetic force for clamping the disc (7) between the turntable and the clamper. ) Is disposed at a position above the clamper, and in a state where the disc is sandwiched between the turntable and the clamper, the stopper means is moved to the clamper only when the support member moves above the neutral position by the buffer member. A sound skipping prevention device for a CD player, wherein a downward elastic force acts on the sound. 2. The sound skipping prevention device for a CD player according to claim 1, wherein said stopper means is provided on a chassis side. 3. The sound skipping prevention device for a CD player according to claim 1, wherein said stopper member is a leaf spring made of metal.