KR19990041895A - CD player damper using Shear mode electrofluid - Google Patents

Abstract

The present invention is a damper for effectively attenuating both the low frequency region vibration and the high frequency region vibration generated in the CD player.

The present invention forms a shaft holder 20 in which the fixed shaft 40 is inserted in the center of the cylindrical body 12, and seals the other side of the body 12 with a plate 14, the of the body 12 Injecting the electromagnetic fluid 30 therein, the through-hole 25 is formed in the center of the disc shape to fix the first electrode plate 24 for applying or grounding the power to the inner surface of the plate 14, A damper 10 fixed to a second electrode plate 26 to which a power is grounded or applied to correspond to the first electrode plate 24 at an end of the shaft holder 20. The resistance and viscosity of the electromagnetic fluid 30 are fixed. Therefore, the vibration of the high frequency region generated in the shaft holder 20 is rapidly reduced, and the shear mode of the sheath mode is formed by the connection band of the corn starch 34 connecting the first electrode plate 24 and the second electrode plate 26. Damping force effectively attenuates vibrations in the low frequency range.

Description

CD player damper using Shear mode electrofluid

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damper for a CD player using an electro-rheological fluid, and more particularly, to an oscillation of an axis holder by injecting an electron fluid containing a catalyst that forms a chain by applying oil and a power in a cylindrical body. The present invention relates to a damper for a CD player using a shear mode electrofluid, which effectively attenuates both vibrations in a low frequency region and a high frequency region having a large vibration width.

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 using an optical pickup actuator, focusing the reflected light into an electric signal.

The optical pickup actuator of such a CD player can accurately reproduce the recording only when the focus of the laser light is formed on the recording pit of the disk, and when the CD player installed with the optical pickup actuator is installed in a place where vibration is continuously generated, such as a vehicle, Vibration transmitted to the CD 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 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 fixed shaft 136 is fixed to the chassis 120 or the deck 130, and the damper 140 coupled to the fixed shaft 136 to the corresponding deck 130 or the chassis 120 is fixed to the deck. 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.

The damper 140 that serves as described above is usually used oil damper 140 injecting the oil 148 into the cylindrical body 142, as shown in Figures 2 and 3, The oil 148 was injected into the sealed 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 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.

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 this damper is such that the shaft holder 144 is in contact with the oil 148 when the shaft holder 144 into which the fixed shaft 136 is inserted vibrates in the oil 148 in the body 142. The vibration of the chassis 120 is attenuated by the attraction force 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 both vibrations of the high frequency region and the low frequency region transmitted from the chassis 120 to the deck 130, for the following reason.

First, the vibration generated when the CD is reproduced by 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. The natural vibration of the actuator is eliminated by its damping action. Therefore, the vibration damped by the damper 140 is limited to external vibration. When the external player 110 is installed in the vehicle, the vibration width generated from the engine of the vehicle is small and the vibration width of the high frequency region and the road surface of the road are uneven, and the vibration width transmitted from the suspension of the vehicle body is large and the speed is high. Is divided into slow low frequency vibrations.

Since the vibration of the low frequency region has a large vibration width, the displacement amount is large, so in order to dampen the vibration, the damping force of the damper 140 must be increased to reduce the transmission rate, 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 increases when the vibration of the low frequency region is transmitted, and when the vibration of the high frequency region is transmitted. The damping force of the damper 140 should be small.

However, the conventional CD player damper 140 is damped by oil-specific viscosity when the shaft holder 144 coupled with the fixed shaft 136 vibrates in the oil 148 filled in the body 142. As a result, the damping force of the oil 148 is constant to effectively attenuate only one of the vibrations of the low frequency region and the vibration of the high frequency region.

That is, when the viscosity of the oil 148 is increased to effectively attenuate the vibration of the low frequency region, the vibration attenuation rate of the high frequency region is lowered, so that the vibration of the high frequency region transmitted from the chassis 120 is transmitted to the deck 130 more strongly. In order to prevent this, when the viscosity of the oil is reduced to effectively attenuate the vibration of the high frequency region, the vibration attenuation rate of the low frequency region is lowered, so that the vibration of the low frequency region transmitted from the chassis 120 is greater than that of the deck 130. It is delivered strongly.

Therefore, the conventional damper 140 is generally set to a low viscosity coefficient of the oil 148 to effectively attenuate the vibration in the high-frequency region, so that the wheels and suspension when the vehicle passes the uneven or curved portion formed on the road Since the vibration transmitted to the chassis 120 is strongly transmitted to the deck 130, the actuator mounted in the deck 130 misses the recording of the disc instantaneously, and thus the playback is stopped.

SUMMARY OF THE INVENTION The present invention has been made to solve the conventional problems, and an object of the present invention is to stabilize the deck by effectively attenuating both the vibration of the low frequency region and the vibration of the high frequency region within one damper, thereby making the deck mounted optical pickup This is to improve the regeneration sensitivity of the actuator.

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

5 is a perspective view showing the electrode plate of the damper for the CD player according to the present invention.

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

(b) is a cross-sectional view showing the action 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 holder 24: first electrode plate

25 through hole 26 second electrode plate

30: electromagnetic fluid 32: oil

34: corn starch 40: fixed shaft

The damper for CD player of the present invention forms a shaft holder in which a fixed shaft is inserted in the center of the cylindrical body, seals the other side of the body with a plate, injects an electromagnetic fluid into the inside of the body, and has a disk-shaped center. A second electrode plate having a through hole formed therein to fix the first electrode plate for applying or grounding the power to an inner surface of the plate, and the power being grounded or applied to the end of the shaft holder so as to correspond to the first electrode plate; It is fixed.

In the CD player damper, when power is applied to the first electrode plate or the second electrode plate, the catalyst contained in the electron fluid forms a chain connecting the first electrode plate and the second electrode plate. The catalyst contained in the electron fluid of the to form a connecting band generates a tensile force against the shaft holder. In this way, the electromagnetic fluid generates a tensile force, which can effectively attenuate the vibration of the shaft holder in a large width, thereby effectively attenuating the vibration of the low frequency region transmitted to the fixed shaft.

Therefore, the damper according to the present invention can effectively attenuate both the vibration of the high frequency region and the vibration of the low frequency region transmitted from the chassis of the CD player to the deck, thereby improving the reproduction sensitivity of the actuator.

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

As shown in FIG. 4, the damper of the present embodiment is a small damper 10 installed with a tension spring having elastic resilience while being supported by the deck to attenuate vibration transmitted from the chassis of the CD player to the deck. To form a shaft holder 20 immersed in the center of the cylindrical body 12 is sealed in the upper side, the attenuation target fixed to the chassis or deck, that is, the fixed shaft 40 is coupled. The body 12 is formed of a rubber material having good elasticity.

Then, the electron fluid 30 is injected into the body 12 and the lower part is sealed with the plate 14 so that the electron fluid 30 is embedded. The electron fluid 30 is a colloidal material in which the corn starch 34 is mixed into the oil 32.

The first electrode plate 24 to which the power is grounded is fixed to the inner surface of the plate 14, and the power is applied to the end of the shaft holder 20 so as to correspond to the first electrode plate 24. The two electrode plates 26 are fixed.

Accordingly, when power is applied to the second electrode plate 26, the corn starch 34 in the electron fluid 30 is connected in a plurality of chains connecting the first electrode plate 24 and the second electrode plate 26. The power applied to the second electrode plate 26 is grounded through the first electrode plate 24. Accordingly, the connection band of the plurality of corn starch 34 generates a tensile force with respect to the shaft holder 20, thereby generating a strong damping force on the shaft holder 20. That is, the strong damping force is generated by using the shear mode of the electromagnetic fluid 30.

Meanwhile, as shown in FIG. 5, the first electrode plate 24 and the second electrode plate 26 are formed in a disc shape so as to easily adhere to the plate 14 and the shaft holder 20. In addition, a through hole 25 is formed in the center of the first electrode plate 24 so that the corn starch 34 may be formed only when the second electrode plate 26 is positioned above or below the first electrode plate 24. Allow the connecting strip to form.

In addition, the damper 10 of the present embodiment allows the power supply to be supplied to the second electrode plate 26 simultaneously with the regeneration mode of the CD player so that the corn starch 34 contained in the electrofluid 30 is the second electrode plate 26. And a band connecting the first electrode plate 24 to each other.

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.

When the damper 10 is installed in the CD player as described above and used in practice, when the fixed shaft 40 is fixed to the deck, the damper 10 is fixed to the chassis and the fixed shaft 40 is fixed to the shaft of the damper 10. When the fixed shaft 40 is fixed to the chassis, the damper 10 is fixed to the deck and the fixed 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 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 fixed 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 this vibration, the chassis vibrates in the same way as the vehicle body, and the damper 10 supporting the deck on the chassis attenuates the vibration transmitted from the chassis. The fixed shaft 40 is fixed to the chassis and the damper 10 on the deck. For example, the action of the damper 10 in the case where is fixed.

When all of the playback of the CD player starts, power is supplied to the second electrode plate 26 of the damper 10. When the shaft holder 20 does not vibrate, as shown in FIG. Since the second electrode plate 26 fixed at the end is located close to the through hole 25 of the first electrode plate 24, the connection band of the corn starch 34 contained in the electron fluid 30 is not formed. The power is not grounded to the first electrode plate 24.

On the other hand, when the vibration of the high-frequency region generated from the engine of the vehicle body is transmitted to the CD player, the fixed shaft 40 fixed to the chassis has a short period of amplitude and also vibrates finely, so that the shaft holder 20 of the damper 10 is moved. Vibrate Accordingly, the shaft holder 20 is vibrated finely in the electromagnetic fluid 30 in the body 12.

At this time, the vibration of the shaft holder 20 is reduced by the resistance and viscosity of the electromagnetic fluid 30 in contact with the shaft holder 20. At this time, since the connection band of the corn starch 34 is not formed, there is no obstacle in reducing the vibration of the high frequency region.

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 fixed shaft 40 fixed to the chassis vibrates with a long amplitude, the damper 10 is inserted into the fixed shaft 40 The shaft holder 20 of () vibrates greatly and moves up and down between the electromagnetic fluid bodies 30 in the body 12.

At this time, as shown in FIG. 6A, when the shaft holder 20 moves upward while power is supplied to the second electrode plate 26 simultaneously with the regeneration mode of the CD player, the first electrode plate is moved. The distance between the upper side of the 24 and the second electrode plate 26 is close, so that the corn starch 34 contained in the electrofluid 30 forms a connecting strip, so that the current is transmitted through the connecting band. 24) and grounded to the outside. In this state, when the shaft holder 20 tries to descend, the connection band of the corn starch 34 generates a tensile force to delay the movement of the shaft holder 20.

Subsequently, as shown in FIG. 6B, when the shaft holder 20 moves downward, the distance between the lower side of the first electrode plate 24 and the second electrode plate 26 is closer to the electromagnetic fluid 30. The contained corn starch 34 forms a connecting strip, so that current flows through the connecting strip to the first electrode plate 24 and is grounded to the outside. In this state, when the shaft holder 20 tries to move upward, the connection band of the corn starch 34 generates a tensile force to delay the movement of the shaft holder 20.

Therefore, since the vibration of the low frequency region of the shaft holder 20 is rapidly reduced by the tension of the connection band of the corn starch 34, the low frequency transmitted from the suspension of the vehicle to the deck supported by the damper 10 and the tension spring. The vibration of the area is not transmitted or is weakly transmitted and quickly disappears.

As described above, the damper 10 of the present embodiment can efficiently reduce both the vibration of the high frequency region and the vibration of the low frequency region transmitted from the chassis of the CD player to the deck, so that it is stable in the optical pickup actuator installed in the drive unit of the deck. The posture forms the focus of the laser light on the disc. As a result, recording reproduction sensitivity of the optical pickup actuator is improved.

As described in the above embodiment, the present invention forms a shaft holder 20 is inserted into the fixed shaft 40 in the center of the cylindrical body 12, the other side of the body 12 to the plate 14 The first electrode plate 24 for sealing or injecting the electromagnetic fluid 30 into the body 12 and forming a through hole 25 in the center of the disc is applied or grounded to the plate ( 14 is a damper 10 fixed to an inner surface of the second electrode plate 26 to which the power is grounded or applied so as to correspond to the first electrode plate 24. The resistance and viscosity of the electromagnetic fluid 30 are fixed. Therefore, the vibration of the high frequency region generated in the shaft holder 20 is rapidly reduced, and the shear mode of the sheath mode is formed by the connection band of the corn starch 34 connecting the first electrode plate 24 and the second electrode plate 26. The damping force effectively attenuates vibrations in the low frequency range so that vibrations are not transmitted to the deck. Therefore, the optical pickup actuator provided in the deck forms the focus of the laser light on the disk in a stable posture, whereby the recording of the disk can be satisfactorily reproduced.

Claims (2)

In the shaft holder 20 is formed in the center of the cylindrical body 12, the fixed shaft 40 is inserted, the other side of the body 12 is sealed with a plate 14, The first electrode plate 24 for injecting or grounding the electron fluid body 30 into the body 12 and forming a through hole 25 in the center of the disc is provided with the plate 14 of the plate 14. The shear mode electromagnetic fluid is fixed to the inner side, and the second electrode plate 26 to which the power is grounded or applied is fixed to the end of the shaft holder 20 so as to correspond to the first electrode plate 24. Used damper for CD player. 2. The CD player damper according to claim 1, wherein the electron fluid (30) is in a colloidal state in which corn starch (34) is mixed in the oil (32).