KR19990017185A - Damping structure of the damper for CD player - Google Patents

Abstract

The present invention is to improve the reproduction sensitivity of the optical pickup actuator by effectively reducing both the vibration of the low frequency region and the vibration of the high frequency region transmitted to the deck of the CD player installed in the vehicle.

The present invention incorporates the oil 30 in the body 12, the outer peripheral surface of the shaft holder 20 in which a fixed shaft 40 fixed to the chassis or deck is immersed into the center from one side of the body 12 is inserted An elliptic cylindrical cushion 22 is formed in the damper structure of the damper 10 for improving the damping force by forming a plurality of through holes 24 penetrating up and down in the cushion 22.

According to the present invention, the ellipsoidal cushion 22 formed in the shaft holder 20 effectively attenuates both the vibration of the low frequency region and the vibration of the high frequency region, thereby focusing 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

Damping structure of the damper for CD player

The present invention relates to a damping structure of a damper for a CD player, and in particular, an ellipsoidal cushion for improving the vibration damping effect on the shaft holder which is in contact with oil in the damper to reduce vibration, and a through hole is formed in the cushion. The present invention relates to a damping structure of a damper for a CD player for 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, a typical oil damper 140 is shown in FIG.

As shown in FIG. 2 (a), the damper 140 injects the oil 148 into the cylindrical body 142 of which the upper side is sealed, and seals the oil 148 by sealing the lower part with the plate 150. ) Is built in. 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 damper 140 is installed in the CD player 110 and actually used, the fixed shaft 136 is fixed to the chassis 120 and the damper 140 is decked as shown in FIG. When fixed to the 130, the fixed shaft 136 is inserted into the shaft holder 144 of the damper 140, the vibration transmitted from the vehicle is transmitted to the chassis 120 of the CD player 110, the fixed shaft 136 ) Will vibrate. At this time, the shaft holder 144 surrounding the outside of the fixed shaft 136 is vibrated in the oil 148, the vibration is attenuated by the damping action of the oil 148 and the damping action by the tension spring 134.

However, in the conventional damper 140 as described above, since the shaft holder 144 into which the fixed shaft 136 is inserted is an ellipsoidal cylinder type, the area in contact with the oil 148 and the contact resistance received from the oil 148 are obtained. Since the damping efficiency is low, the vibration of the high frequency region having a small amplitude of vibration generated by the engine of the automobile and transmitted to the CD player 110 is relatively attenuated, but due to the unevenness of the road, the CD player ( The vibration width transmitted to 110 may not quickly reduce the vibration of the large low frequency region. Therefore, when the damper 140 is provided with the CD player 110 is subjected to the vibration of the low frequency region, the damping force by the damper 140 is weak, so that the vibration time of the deck 130 is long, installed on the deck 130 There is a problem that the sensitivity of reproducing recording of a disc in the optical pickup actuator is lowered.

The present invention has been made to improve the conventional problems, an object of the present invention by effectively reducing both the vibration of the high frequency region and the low frequency region generated from the vehicle body and transmitted to the deck of the CD player installed in the vehicle This is to improve the reproduction sensitivity of the optical pickup actuator installed in the deck.

The purpose is to form an ellipsoidal cushion on the outer circumferential surface of the shaft holder in which oil is embedded in the body, immersed from one side of the body into the center, and a fixed shaft fixed to the chassis or deck is inserted therein, and the cushion It can be achieved by providing a damping structure of the damper for the CD player to form a through-hole penetrating up and down in the elastic to attenuate a large vibration elastically.

1 is a perspective view showing a typical CD player.

2 (a) and 2 (b) are cross-sectional views showing a general CD player damper.

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

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

Figure 5 is a plan sectional view showing the action of the damper for the CD player according to the present invention.

＊ Explanation of symbols on main parts of drawing

10 damper 12 body

14 plate 16: groove

20: shaft holder 22: cushion

24: through hole 30: oil

40: fixed shaft

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.

As shown in FIG. 3, the damper of the present embodiment is an oil damper 10 installed with a tension spring to attenuate the vibration transmitted from the chassis of the CD player to the deck, and has a cylindrical body 12 having an upper side sealed thereto. Inject the oil 30 in the), and seal the lower portion with the plate 14 so that the oil 30 is embedded.

The shaft holder 20 is formed to be immersed downward from the upper side of the body 12 so that the fixed shaft 40 fixed to the chassis or deck is inserted, and oil 30 is formed on the outer circumferential surface of the shaft holder 20. To increase the area in contact with the shaft holder 20 forms an ellipsoidal cylinder-shaped cushion 22 in contact with the body 12 when the shaft holder 20 vibrates largely. The cushion 22 is formed of a rubber material of high elasticity to reduce vibrations by its elasticity, and a plurality of through holes 24 penetrated up and down in the cushion 22 to allow the oil 30 to enter and exit. Instead of reducing the elastic force of the cushion 22, the damping force is improved.

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

The damper 10 has an improved damping force by the cushion 22 to efficiently attenuate vibrations in the high frequency region, as well as an ellipsoidal cushion 22 when the large vibration occurs in the low frequency region. ) Effectively attenuates the vibration of the low frequency region by elasticity of the oil 30 entering and exiting the through hole 24 formed in the cushion 22 in contact with the elasticity thereof.

When the damper 10 having the ellipsoidal cushion 22 having the above-described configuration is installed in the CD player and actually used, when the damper 10 is fixed to the chassis as shown in FIG. The shaft 40 is fixed to the deck to be inserted into the shaft holder 20 of the damper 10. When the damper 10 is fixed to the deck, the fixing shaft 40 is fixed to the chassis to prevent the damper 10. It is to be inserted into the shaft holder (20).

At this time, the cushion 22 of the ellipsoidal body formed in the shaft holder 20 is adjusted to the installation angle of the damper 10 so that the longitudinal direction is located up and down, so that the protrusions of the cushion 22 are upper and lower bodies 12. Make contact with

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

In the CD player, the chassis of the main body is vibrated by vibration of the high frequency region generated from the engine when the vehicle is driven and vibration of the low frequency region transmitted from the suspension device by vibrating the vehicle body according to the road surface condition of the road, Accordingly, the fixed shaft 40 or the damper 10 fixed to the chassis vibrates. Since the vibration transmitted from the engine and the outside of the vehicle acts almost in the up and down direction, the vibration of the fixed shaft 40 acts mainly in the up and down direction.

The damping action of the damper 10 will now be described, for example, when the fixed shaft 40 is installed in the chassis and the damper 10 is installed on the deck.

When the vibration of the high frequency region generated from the engine of the vehicle body is transmitted to the CD player and the fixed shaft 40 fixed to the chassis vibrates, the shaft holder 20 of the damper 10 into which the fixed shaft 40 is inserted is the body ( 12 is vibrated in contact with the oil 30 in the ellipsoidal structure. An ellipsoidal cushion 22 formed on the outer circumferential surface of the shaft holder 20 contacts the oil 30 in a large area, and the oil 30 has a viscosity. The shaft holder 20 and the ellipsoidal cylindrical cushion 22 are largely turned to flow up and down. Therefore, the vibration transmitted to the chassis is attenuated by the cushion 22 formed in the shaft holder 20 and is not transmitted or weakly transmitted to the deck supported by the damper 10 and the tension spring and quickly disappears.

When the vibration of the low frequency region generated in the suspension of the vehicle is transmitted to the CD player by the unevenness of the road, the fixed shaft 40 fixed to the chassis vibrates as shown in FIG. Cushion (22) formed in the shaft holder 20 of the damper 10 surrounding the () is in contact with the body 12 fixed to the deck.

At this time, since the cushion 22 has its own elasticity, vibration can be attenuated, and the through hole 24 formed by penetrating the cushion 22 up and down by the pressure of the cushion 22 in contact with the body 12 is formed. The oil (30) embedded in the) escapes to the outside and merges with the oil (30) in the body 12, thereby improving the elasticity of the cushion 22 to more effectively attenuate vibration. Therefore, the vibration of the fixed shaft 20 is weakly transmitted to the deck and the deck is quickly stabilized.

On the other hand, when the fixed shaft 40 is installed on the deck and the damper 10 is installed in the chassis, the damper 10 does not vibrate without the fixed shaft 40 vibrating, and at this time, the damper 10 having the cushion 22 formed thereon. Damping action of) is the same as when the fixed shaft 40 is installed on the chassis and the damper 10 is installed on the deck.

Therefore, the deck provided with the damper 10 is quickly stabilized by the vibration damping action of the damper 10 and the vibration damping action of the tension spring that supports the deck to the chassis, so that the deck in the optical pickup actuator installed in the deck 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 oil 30 in the body 12 of the CD player damper 10, and is immersed in the center from one side of the body 12 to the chassis or deck. An elliptic cylindrical cushion 22 is formed on the outer circumferential surface of the shaft holder 20 into which the fixed shaft 40 is inserted, and a through hole 24 penetrated up and down in the cushion 22 is damped. The damping structure of the damper 10 is improved, and the deck is quickly stabilized by the vibration attenuation action of the shaft holder 20 in which the ellipsoidal cushion 22 is formed, so that the deck is stabilized in the optical pickup actuator installed in the deck. There is an effect that the recording of the disc can be satisfactorily reproduced by forming the focus of the laser light on the disc.

Claims (1)

In the damper for CD player in which the oil 30 is embedded in the body 12, and the shaft holder 20 into which the fixed shaft 40 is inserted from the one side of the body 12 into the center is immersed, An elliptic cylindrical cushion 22 is formed on an outer circumferential surface of the shaft holder 20, and a plurality of through holes 24 are formed in the cushion 22. Damping structure.