KR19990017018U - Cushioned damper for CD player - Google Patents

Abstract

The present invention is to the damper for the CD player to effectively attenuate both the vibration of the low frequency region and the vibration of the high frequency region.

The present invention forms a shaft holder 20 is coupled to the attenuation object in the center of the body 12 having an inherent elastic modulus, filling the oil 30 having a viscosity in the body 12, the body The inner circumferential surface of (12) integrally forms an annular cushion (22) formed therein the chamber (26) in which the oil (30) is stored, and communicates with the chamber (26) above and below the cushion (22). The through hole 28 is formed, and a metal crust 24 is coated on the inner circumferential surface of the cushion 22.

The present invention is the vibration of the high frequency region of the vibration of the support shaft 20 inserted into the shaft holder 20 is reduced by the resistance and viscosity of the oil 30, the vibration of the low frequency region is the cushion 22 and the cushion 22 By rapidly reducing the elasticity of the oil 30 in the chamber 26 formed in the chamber 26 and the crust 24 coated on the cushion 22, the focus of the laser light on the disk in a stable posture in the optical pickup actuator installed in the deck There is an effect that the recording can be satisfactorily reproduced.

Description

Cushioned damper for CD player

The present invention relates to a damper for a CD player having a cushion, and in particular, a shaft holder is formed on the inner surface of the body of the CD player damper filled with oil, and the shaft holder is coated with an elastic crust. The present invention relates to a damper for a CD player having a cushion that can effectively attenuate both low frequency vibration and high frequency vibration.

In general, a CD player is an apparatus for reproducing recording of a disc by forming a focus of laser light on a pit recorded on the disc by using an optical pickup actuator, focusing the reflected light into an electric signal.

The optical pickup actuator of such a device can reproduce the recording well only by accurately focusing the laser light on the recording pit of the disc. When the CD player in which the optical pickup actuator is installed is installed in a place where vibration is continuously generated, such as a vehicle, Vibration transmitted to the player makes the focus of the laser light formed on the recording pit of the disc unstable, resulting in a failure or interruption of recording and reproduction. Therefore, damping is required for the CD player for a vehicle to rapidly reduce the transmitted vibration and to increase the recording and reproduction sensitivity.

As shown in FIG. 1, the CD player provided with a damper for damping includes a tray 130 in which a tray 132 for seating and rotating a disk and an optical pickup actuator for picking up a record of the disk are installed. Is fixed to the chassis 120 of the body. The CD player 110 supports the deck 130 to the chassis 120 with a tension spring 134 to protect the pickup function of the optical pickup actuator from the vibration and shock transmitted from the chassis 120 to the deck 130. Meanwhile, the support shaft 136 is fixed to the chassis 120 or the deck 130, and the damper 140 coupled to the support shaft 136 is fixed to the corresponding deck 130 or the chassis 120. By allowing the 130 to be supported by the damper 140, the vibration and shock transmitted from the chassis 120 are reduced by the damping action of the tension spring 134 and the damper 140.

Damper 140, which serves as described above, is usually used oil damper 140 injecting the oil 148 into the body 142, as shown in Figures 2 and 3, the upper side is closed The oil 148 was injected into the cylindrical body 142 and the bottom was sealed with the plate 150 to allow the oil 148 to be embedded therein. A shaft holder 144 is formed in the body 142 so as to be immersed downward from the upper side, and a support shaft 136 fixed to the chassis 120 or the deck 130 is inserted to damp the oil 148. To receive, and formed an annular groove 146 on the outer circumferential surface of the body 142 to be inserted into a circular hole formed in the chassis 120 or the deck 130 to be fixed.

Therefore, when the CD player 110 is installed in a vehicle, when the vehicle is driven, vibrations transmitted from the vehicle body are transmitted to the chassis 120 of the CD player 110, at which time the deck 130 is transferred to the chassis 120. The damper 140 to support the attenuated vibration to reduce the vibration transmitted to the deck. The action of the damper is such that when the shaft holder 144 into which the support shaft 136 is inserted vibrates in the oil 148 in the body 142, the shaft holder 144 is subjected to resistance and oil ( The vibration of the chassis 120 is attenuated by the friction of the viscosity of 148, so that the vibration of the chassis 120 is reduced and transmitted to the deck 130.

However, the damper 140 as described above does not effectively attenuate the vibration transmitted from the chassis 120 to the deck 130, for the following reasons.

First, the vibration generated during CD playback of the drive unit installed in the deck 130 is divided into the natural vibration of the optical pickup actuator and the external vibration transmitted from the chassis 120. Since the natural vibration of the actuator is eliminated by its damping action. Vibration damped by the damper 140 is limited to external vibration. When the CD player 110 is installed in a vehicle, the external vibration is divided into a vibration of a high frequency region generated from an engine of the vehicle and a vibration of a low frequency region transmitted from a suspension device of the vehicle body.

Since the vibration of the low frequency region has a large vibration width and a large displacement amount, the damping force of the damper 140 must be increased to reduce the transmission rate, so that the transmission rate can be reduced, and the vibration of the high frequency region has a relatively small vibration width so that the displacement amount is small. In order to attenuate this vibration, it is known that the damping force of the damper 140 must be made small to reduce the transmission rate.

Therefore, in order to effectively attenuate both the vibration of the low frequency region and the vibration of the high frequency region transmitted from the chassis 120, the damping force of the damper 140 is increased when the vibration of the low frequency region is transmitted, and when the vibration of the low frequency region is transmitted. The damping force of the damper 140 should be small.

However, in the conventional conventional CD player damper 140, since the shaft holder 144 to which the support shaft 136 is coupled is simply vibrated in the oil 148 filled in the body 142, the contact resistance of the oil 148 Only damping force is generated. Therefore, the conventional damper 140 has a problem that it is impossible to effectively attenuate both the vibration of the low frequency region and the vibration of the high frequency region because the magnitude of the damping force is constant.

The present invention was devised to improve the conventional problems, and an object of the present invention is to allow the damper for the CD player to effectively attenuate both the vibration of the low frequency region and the vibration of the high frequency region, so that the CD player equipped with the damper has a low frequency. Even if the vibration of the region and the vibration of the high frequency region is continuously installed in a vehicle or the like to maintain a constant sensitivity of the optical pickup actuator installed in the deck.

1 is a perspective view showing a typical CD player.

Figure 2 is a side cross-sectional view showing a typical CD player damper.

Figure 3 is a cross-sectional view showing a typical CD player damper.

Figure 4 is a perspective view showing a cut in the damper for the CD player according to the present invention.

Figure 5 is a side cross-sectional view showing a damper for the CD player according to the present invention.

Figure 6 is a cross-sectional view showing a damper for the CD player according to the present invention.

<Explanation of symbols for main parts of drawing>

10 damper 12 body

14 plate 16: groove

20: shaft holder 22: cushion

24: Crust 26: Chamber

28: through hole 30: oil

40: support shaft

In the damper for CD player of the present invention, the shaft holder is coupled to the attenuation target in the center of the body having a unique elastic modulus, and in the damper for CD player filled with oil having a viscosity in the body, the body An annular cushion formed therein with a chamber in which oil is stored on the inner circumferential surface thereof, and a plurality of through holes communicating with the chamber are formed above and below the cushion, and a metal crust is coated on the inner circumferential surface of the cushion. It is characterized by.

The damper for the CD player dampens the external vibration by vibrating in the oil when the vibration of the high frequency region is transmitted, and reduces the external vibration by contacting the cushion by the shaft holder when the vibration of the low frequency region is transmitted. Therefore, both high frequency and low frequency vibrations can be effectively attenuated.

Hereinafter, the present invention will be described in detail by explaining a preferred embodiment of the damper for the CD player according to the present invention.

4 and 5, the damper of the present embodiment is a small damper that is installed with a tension spring having elastic resilience while being supported on the deck to attenuate vibration transmitted from the chassis of the CD player to the deck ( 10), the viscous oil 30 is injected into the cylindrical body 12 of which the upper side is sealed, and the lower part is sealed with the plate 14 so that the oil 30 is embedded.

The body 12 is formed of a rubber material, which rubber material corresponds to a spring in terms of vibration damping efficiency, and actually has a constant high elastic modulus.

And the body 12 is formed in the shaft holder 20 recessed downward from the upper center to combine the attenuation target, that is, the support shaft 40 fixed to the chassis or deck, the shaft on the inner peripheral surface of the body 12 The annular cushion 22 having the chamber 26 in which the oil 30 is stored therein is formed integrally with the holder 20. The cushion 22 is in contact with the shaft holder 20 when the shaft holder 20 to which the support shaft 40 is coupled vibrates up and down greatly in response to a large vibration of the low frequency region, thereby causing vibration of the shaft holder 20. It serves to rapidly attenuate.

In addition, a plurality of through holes 28 communicating with the chamber 26 are formed above and below the cushion 22, and a metal crust 24 is coated on the inner circumferential surface of the cushion 22. The through hole 28 is formed by the oil 30 in the chamber 26 and the oil 30 in the body 12 when one side of the cushion 22 is deformed by the pressure of the shaft holder 20. By bringing them together, the cushion 22 acts to greatly expand and contract. In addition, since the metal crust 24 coated on the inner circumferential surface of the cushion 22 has elasticity, even if the shaft holder 20 contacts a part of the cushion 22, only a part of the cushion 22 is prevented from being deformed. It serves to evenly distribute the pressure of the shaft holder 20 throughout the cushion (22).

And the outer circumferential surface of the body 12 to form an annular groove 16 is fixed to the circular hole formed in the chassis or deck.

On the other hand, when the damper 10 as described above is installed in the CD player and actually used, when the support shaft 40 is fixed to the deck, the damper 10 is fixed to the chassis and the support shaft 40 is damped by the damper 10. Coupled to the shaft holder 20, and the support shaft 40 is fixed to the chassis, and the damper 10 is fixed to the deck and the support shaft 40 is coupled to the shaft holder 20 of the damper 10. .

Hereinafter, the operation of the damper assembled in the CD player as described above.

When the CD player equipped with the damper 10 is installed in the vehicle, when the vehicle is driven, the vibration of the low frequency region generated from the suspension device of the vehicle according to the vibration of the high frequency region generated from the engine of the vehicle and the road surface state of the road It is delivered to the player, causing the chassis of the body to vibrate. As a result, the support shaft 40 or the damper 10 fixed to the chassis of the CD player vibrates, and the direction of vibration acts almost vertically.

In the transmission of the vibration, the chassis vibrates in the same manner as the vehicle body, and the damper 10 supporting the deck on the chassis attenuates the vibration transmitted from the chassis, and the support shaft 40 is fixed to the chassis and the damper on the deck For example, the action of the damper 10 in the case where 10) is fixed will be described with reference to FIG. 6.

When the vibration of the high frequency region generated from the engine of the vehicle body is transmitted to the CD player, the support shaft 40 fixed to the chassis vibrates the shaft holder 20 of the damper 10 by vibrating minute amplitudes with a small period. . Accordingly, the shaft holder 20 vibrates finely in the oil 30 in the body 12.

At this time, the vibration speed of the shaft holder 20 is lowered by the resistance and viscosity of the oil 30 in contact with the shaft holder 20. Therefore, the vibration of the high frequency region generated from the engine of the vehicle is not transmitted or weakly transmitted to the deck supported by the damper 10 and the tension spring and disappears.

On the other hand, when the vibration of the low frequency region is transmitted to the CD player from the suspension of the vehicle body, since the support shaft 40 fixed to the chassis vibrates with a large amplitude with a large period, the damper 10 into which the support shaft 40 is inserted is provided. Of the shaft holder 20 vibrates greatly between the oil 30 in the body 12, and at the same time, the upper and lower sides of the shaft holder 20 alternately contact the upper and lower sides of the cushion 22 according to the vibration period.

The shaft holder 20 is in contact with the cushion 22 while being damped by the resistance and viscosity of the oil 30, the elasticity of the cushion 22 itself and the buffering action of the chamber 26 formed inside the cushion 22. As a result, vibrations are reduced quickly. When the oil 30 is filled in the chamber 26 and the cushion 22 is deformed by the pressure of the shaft holder 20, the through hole formed at the top and bottom of the cushion 22 while the oil 30 is compressed ( By escaping outward through 28 and joining with the oil 30 in the body 12, the cushion 22 is greatly contracted so that the vibration of the shaft holder 20 is more efficiently reduced.

In addition, even when the shaft holder 20 contacts a portion of the metal crust 24 coated on the inner circumferential surface of the cushion 22, only a portion of the cushion 22 is compressed by dispersing the pressure of the shaft holder 20 by its elasticity. And the vibration of the shaft holder 20 is reduced more quickly by causing the entire cushion 22 to contract.

Therefore, the damper 10 has an improved damping force by the cushion 22 to effectively reduce the vibration of the high frequency region and the vibration of the low frequency region transmitted from the chassis to the deck.

As described above, the deck in which the damper 10 of the present embodiment is installed is quickly stabilized by the vibration damping action of the tension spring supporting the deck to the chassis together with the vibration damping action of the damper 10, and thus, the deck is installed in the drive unit of the deck. The optical pickup actuator forms a focus of the laser light on the disk in a stable posture. As a result, recording reproduction sensitivity of the optical pickup actuator is improved.

As described in the above embodiment, the present invention forms an axis holder 20 to which the attenuation target is coupled to the center of the body 12 having an inherent elastic modulus, and has an oil having viscosity inside the body 12. Filling 30, the inner peripheral surface of the body 12 is formed integrally with an annular cushion 22 formed therein the chamber 26, the oil 30 is stored therein, the inner peripheral surface of the cushion 22 As a damper for a CD player coated with a metal crust 24, the vibration of the high frequency region of the vibration of the support shaft 20 inserted into the shaft holder 20 is reduced by the resistance and viscosity of the oil 30. The vibrations in the low frequency region are rapidly reduced by the elasticity of the oil 22 in the chamber 26 formed inside the cushion 22 and the cushion 22 and the crust 24 coated on the cushion 22, thereby being installed in the deck. In the optical pickup actuator, the laser beam is focused on the disk in a stable posture. There is an effect that the recording can be reproduced well.

Claims (1)

A shaft holder 20 to which the attenuation target is coupled is formed in the center of the body 12 having an inherent elastic modulus, and the damper 10 for the CD player in which the oil 30 having viscosity is filled in the body 12. ), An inner cushion 22 having an annular cushion 22 formed therein is formed integrally with the inner circumferential surface of the body 12, and communicates with the chamber 26 above and below the cushion 22. Forming a plurality of through-holes 28, the damper for a CD player having a cushion, characterized in that the coating of the metal crust 24 on the inner peripheral surface of the cushion (22).