KR19990013031U - Damping structure of the damper for CD player - Google Patents

Abstract

The present invention relates to a damping structure of a damper for a CD player. This has a rubber body 12 having a unique elastic modulus and a variable damping coefficient inside the body 12 so as to effectively attenuate vibration generated in a high frequency region and a low frequency region installed in a vehicle. Shaft hole 20 is formed in the center of the small damper 10 filled with the fluid 30 and the elastic ring portion integrally connected with the body 12 on the inner horizontal facing surface of the shaft hole 20, the attenuated object is built up And a damper 10 provided with a chamber 24 formed through the center of the elastic ring portion 22. As a result, the vibration generated in each natural frequency band is effectively attenuated, and thus, the optical pickup actuator installed in the deck can form a focus of the laser light on the disk in a stable posture, whereby the recording of the disk can be satisfactorily reproduced.

Description

Damping structure of the damper for CD player

The present invention relates to a damping structure of a CD player damper, and in particular, fills the oil on the inner side of the damper and forms an elastic ring and a hole contacting the oil, thereby improving the vibration damping effect of the shaft hole, which serves to reduce the vibration. A damping structure of a damper for a CD player capable of effectively attenuating both vibrations in a low frequency region and vibrations in a high frequency region.

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 having the damper for damping includes a tray 132 for seating and rotating the disk and a deck 130 provided with an optical pickup actuator for picking up the recording of the disk. 120). 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 vibrations and shocks transmitted from the chassis 120 to the deck 130. Meanwhile, the fixed shaft 136 is fixed to the chassis 120 or the deck 130 and the damper 140 is fixed to the corresponding deck 130 or the chassis 120 so that the deck 130 is provided to the damper 140. By being supported, 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 generally used oil damper 140 injecting oil 148 into the body 142, which is shown in Figures 2a and 2b, the damper 140 ) Injects the oil 148 into the cylindrical body 142 of which the upper side is sealed, and seals the lower part with the plate 150 to have the oil 148 embedded therein. A shaft holder 144 is formed in the body 142 to be immersed downward from the upper side, and a fixed 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.

When the damper 140 formed as described above is installed in the CD player 110, the operation of each part during vibration attenuation will be described as follows.

First, vibration generated during regeneration is divided into natural vibration and external vibration. Vibration in which the damper is attenuated is external vibration, and the generation of such external vibration can be regarded as starting from the chassis 120 of the CD player 110. The vibration generated in the chassis 120 is divided into the vibration of the high frequency region generated in the engine room and the vibration of the low frequency region transmitted from the suspension device of the vehicle, and at the same time, the damping is increased in the frequency range of the low frequency region. It is known that reducing the damping in the high frequency band can reduce the transmission rate in the entire frequency band. In addition, when the displacement amount which is the vibration width in the low frequency region is large, the displacement amount in the high frequency region is relatively small.

However, vibration damping generally requires a combination of damping and elastic forces to increase the effects of vibration damping.In such dampers, the displacement of response to displacement in the low frequency region is displaced from the shaft holder and the wall inside the body and is thus Vibration is attenuated only by the oil filled into the damping force and attenuated only by the damping force. Vibration is attenuated without the addition of elastic force. Therefore, vibration attenuation in the low frequency range is not efficient. , Vibration damping only by the elastic force of the rubber material, there was a problem that vibration damping is not efficient even in the high frequency region.

The present invention is designed to improve the conventional problems, and the object of the present invention is that the vibration of the low frequency region and the high frequency region, especially when the CD player is installed in a vehicle, the damping force and the elastic force in each frequency band is complex The vibration damping effect is effectively caused to improve the reproduction sensitivity of the optical pickup actuator installed on the deck of the CD player.

In order to achieve the above object, the present invention is a decay target is formed by recessed in the center of the body of the rubber material having a unique elastic modulus and a fluid-filled damper having a variable damping coefficient inside the body. Provided is a damping structure of a damper for a CD player comprising a shaft hole to be formed, an elastic ring portion integrally formed with the body at an inner side facing the shaft hole, and a damper having a chamber formed through the center of the elastic ring portion.

1 is a perspective view showing a typical CD player.

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

Figure 3 is a perspective view showing the cut in the damper for the CD player according to the present invention.

Figure 4a is a longitudinal sectional view of the damper for the CD player according to the present invention.

Figure 4b is a cross-sectional view of the 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 hole 22: elastic ring

24: chamber 30: oil

40: damping shaft

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

As shown in FIG. 3, the damper of the present embodiment is a small damper 10 installed with a tension spring that is supported by the deck and exerts an elastic restoring force in order to attenuate vibration transmitted from the chassis of the CD player to the deck. As the upper side is sealed, the fluid 30 is injected into the cylindrical body 12, for example, a certain range of viscosity oil or the like, and the lower part is sealed with the plate 14 so that the fluid 30 is compressed and flowed. To be.

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

In addition, since the shaft 12 is formed in the body 12 by being recessed downward from the upper center, the damping shaft 40 fixed to the chassis or deck is formed, and the inner side of the shaft hole 20 is formed. In the upper position, the elastic ring portion 22 is integrally rounded at the inner side of the body 12.

In addition, a chamber 24 is formed through the center portion of the elastic ring portion 22, and the chamber 24 is also filled with a predetermined amount of fluid 30.

The flow of the fluid 30 filled inside the body 12 during compression or vibration due to the formation of the elastic ring portion 22 increases the flow rate between the shaft hole 20 and the elastic ring portion 22 and decreases the pressure. In this case, the fluid 30 can be expanded and suddenly reduced in fluidized phase, and the one surface of the elastic ring 22 and the inner surface of the shaft hole 20 are in close proximity.

On the other hand, the elastic ring portion 22 is rounded inside the body 12, and the elastic ring portion 22 increases the contact area between the fluid 30 and the inner surface of the body 12, and consequently the fluid 30 Viscosity force is increased, and the fluid 30 is compressed and flows inside the body 30, thereby exerting a damping force, thereby improving the viscosity force by increasing the contact area. To improve.

In addition, the fluid compressed in the chamber 24 in the state where the damping force is improved as described above further improves the damping force when the vibration is reduced, and at the same time, the chamber has a negative spring force due to the expansion of the chamber, that is, the restoring force generated during the compression of the fluid. Will be used.

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

The damper 10 is the damping force is improved by the elastic annulus 22 in the body and at the same time the elastic force is improved in accordance with the rapid contact between the elastic annulus 22 and the inner surface of the shaft hole (20).

This is because the damping force is significantly changed due to the double fluid compression caused by the elastic force of the elastic ring 22 and the fluid compressed in the chamber 24 with respect to the strain against external vibration, and thus the damping ratio is significantly changed. In addition, such a change in damping rate makes the response characteristic appear effectively.

When the damper 10 having the above configuration is installed in the CD player and actually used, the damping shaft 40 is fixed to the deck and installed in the shaft hole 20 of the damper 10, and the damper 10 is fixed to the deck. In this case, the damping shaft 40 is fixed to the chassis to be inserted into the shaft hole 20 of the damper 10.

Hereinafter, the operation of the damper assembled as described above will be described.

When the CD player equipped with the damper 10 is installed and operated in a vehicle, vibrations of the high frequency region generated from the engine room and vibrations of the low frequency region generated from the axle of the vehicle body are transmitted into the cabin according to the road surface condition of the road. Each of these vibrations is transmitted to the CD player so that the chassis of the main body vibrates. Thus, the damping shaft 40 or damper 10 fixed to the chassis of the CD player vibrates.

In the transmission of the vibration described above, the chassis is vibrated in the same manner as the body vibration, and the vibration of the deck supported by the damper 10 from this chassis absorbs the vibration of the chassis by damping the damper 10.

As shown in FIGS. 4A and 4B, when the damping shaft 40 fixed to the chassis vibrates when the vibration of the high frequency region is transmitted from the engine of the vehicle body to the CD player as shown in FIGS. 4A and 4B. Since the oscillation width is small and the amplitude is also small, the shaft hole 20 of the damper 10 in which the damping shaft 40 has been built up vibrates while compressing the fluid 30 in the body 12. An interval between the inner surface of the 20 and the elastic ring portion 22 annular to the inside of the body 12 is narrowed or widened in a direction perpendicular to the vibration direction. At this time, the fluid 30 is compressed and flows due to the vibration of the shaft hole 20, so that the fluid 30 that flows in the gap narrowed in the orthogonal direction between the elastic ring portion 22 and the shaft hole 20 flows through the sudden reduction path. Loss head is generated, and this loss head is considered to exclude potential energy of the fluid 30 and at the same time the pressure head is considered to exclude the pressure head since the body 12 is sealed, so only the speed head is suddenly lost and the total As a result of the compressive flow, the loss head increases, and the viscosity of the fluid 30 decreases, and the velocity of the fluid 30 decreases. The external surface area of the expanded elastic ring 22 suddenly increases the contact area with the fluid 30. As it increases, the speed of the fluid 30 is drastically lowered by viscosity. That is, in view of the vibration, the damping force is significantly increased, and this increase in damping force is not transmitted or weakly transmitted to the deck supported by the damper 10 and the tension spring and quickly disappears.

In addition, the elastic ring portion 22 and the chamber 24 are double damped due to the chamber 24 formed through the inner surface of the elastic ring portion 22 and the fluid 30 compressed in the inner surface of the chamber 24. It is done quickly.

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, when the damping shaft 40 fixed to the chassis vibrates, the vibration width of the damping shaft 40 becomes large and its amplitude also becomes large. While the shaft hole 20 of the damper 10 in which the 40 is formed is vibrated while compressing the fluid 30 in the body 12, the inner surface of the shaft hole 20 has the same elastic cycle as the vibration period. Alternate contact with. Before such a contact state, the inner surface of the shaft hole 20 is damped and elongated by the viscosity of the fluid 30 in the state in which the fluid 30 is stored, and in the contacted state, the elastic ring portion 22 supports the shaft hole 20. It will be elastically supported. Therefore, since the elastic ring portion 22 supports the shaft hole 20 and is operated as a spring at the vibration surface, the spring force increases the damping ratio because the spring damps the vibration of the shaft hole 20 and at the same time.

Therefore, the high frequency region generated in the vehicle body as a result of the increase in the viscous force due to the rapid contact between the elastic ring portion 22 and the shaft hole 20 and the increase in the contact area between the elastic ring portion 22 and the fluid 30. The vibration and the vibration of the low frequency region is effectively absorbed by the damper 10, respectively, so that the vibration attenuation is faster.

In addition, since the residual vibration of the shaft hole 20 generated after the excitation of the vibration that can be generated due to the vibration attenuation is sufficiently attenuated in the fluid 30, the vibration generated in the CD player can be significantly reduced.

Therefore, the deck in which the damper 10 is installed is quickly stabilized by the vibration damping action of the damper 10 and the vibration damping action of the tension spring supporting the deck on the chassis, and thus the posture stable in the optical pickup actuator installed in the deck. As a result, the focus of the laser light is formed on the disk. As a result, recording reproduction sensitivity of the optical pickup actuator is improved.

As described in the above embodiments, the present invention incorporates a fluid in the body of the CD player damper, and the CD player is installed in the vehicle due to the elastic ring portion formed inside the body and the chamber inside the elastic ring portion so that each natural frequency Since the vibration generated in the area band is effectively attenuated, the optical pickup actuator provided in the deck can effectively focus the laser light on the disk in a stable posture, thereby producing good reproduction of the recording of the disk.

Claims (1)

In the small damper 10 filled with a rubber body 12 having a unique elastic modulus and a fluid 30 having a variable damping coefficient inside the body 12, A shaft hole 20 recessed in the center of the damper 10 to attenuate the damping object, an elastic ring portion 22 integrally connected with the body 12 on an inner horizontally opposite surface of the shaft hole 20; Damping structure of the damper for a CD player, characterized in that consisting of a damper (10) having a chamber (24) formed in the center of the elastic ring portion (22).