KR19990017186A - 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.

In the present invention, the oil holder 30 is embedded in the body 12, the shaft holder 20 is immersed into the center from one side of the body 12 is inserted into the fixed shaft 40 fixed to the chassis or deck is In the oil damper 10 formed, the cylindrical cushion 22 formed in the vertical and horizontal directions, respectively, the divided pieces 26 forming a plurality of chambers 24 are blocked on the outer peripheral surface of the shaft holder (20) Is provided, the oil 30 is injected into the respective chambers 24, the outer surface of the cushion 22 is coated with a metal crust (28).

According to the present invention, the cylindrical cushion 22 formed on the shaft holder 20 effectively attenuates both the vibration of the low frequency region and the vibration of the high frequency region, thereby forming 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 of the disc can be reproduced well.

Description

Damping structure of the damper for CD player

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damper for a CD player having a cushion, and in particular, a cylindrical cushion for improving vibration damping effect on an axis holder which serves to reduce vibrations by contacting oil in the damper, and an elasticity of the outer peripheral surface of the cushion. The present invention relates to a damping structure of a CD player damper for forming a crust to effectively attenuate 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, the shaft holder 144 into which the fixed shaft 136 is inserted has a cylindrical shape, so that the area in contact with the oil 148 and the contact resistance received from the oil 148 are small. 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 vehicle and transmitted to the CD player 110 is relatively attenuated. However, the CD player 110 may be removed from the suspension device of the vehicle due to unevenness of the road. It is not possible to quickly reduce the vibration in the low frequency region where the vibration width transmitted to the large. 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 above object is to form a plurality of chambers in which the outside is cut off on the outer circumferential surface of the shaft holder in which oil is embedded in the body and immersed from one side of the body into the center and inserted into the fixed shaft fixed to the chassis or deck. The divided pieces have cylindrical cushions each formed in the vertical and horizontal directions, inject oil into the respective chambers, and have an annular crust coated with a metal on the outer circumferential surface of the cushion to elastically attenuate a large vibration. It can be achieved by providing a damping structure of a damper for a CD player.

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: chamber 26: divided pieces

28: crust 30: oil

40: fixed shaft

Hereinafter, the present invention will be described in detail by explaining a preferred embodiment of the damping structure of the CD player damper 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 the outside is blocked on the outer circumferential surface of the shaft holder 20. The divided pieces 26 forming the plurality of chambers 24 have cylindrical cushions 22 formed in the vertical and horizontal directions, respectively, and inject the oil 30 into the respective chambers 24. Therefore, the shaft holder 20 is widened in contact with the oil 30 by the cushion 22, and the shaft holder 20 has elasticity when the shaft holder 20 vibrates to a great extent and contacts the body 12.

The cushion 22 is formed of a high elastic rubber material to reduce vibration due to its elasticity, and the outer peripheral surface of the cushion 22 is provided with a crust 28 coated with a thin film of metal so that one side of the cushion 22 is a body. Even when contacted with (12), the impact of the crust 28 is to be evenly distributed throughout the oil 30 contained in the body (12).

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 a damping force improved by the cushion 22 to efficiently attenuate vibrations in the high frequency region, and in the case of a large vibration in the low frequency region, the cylindrical cushion 22 is applied to the body 12. The elasticity of itself and the elasticity of the crust 28 coated on the outer circumferential surface of the cushion 22 and the oil 30 contained in the chamber 24 formed in the cushion 22 effectively attenuate vibrations in the low frequency region.

When the damper 10 having the cylindrical 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. 4, the fixed 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 fixed shaft 40 to the chassis to secure the shaft holder of the damper 10 Insert into (20).

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 be described, for example, when the fixed shaft 40 is installed in the chassis and the damper 10 is installed in 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 and vibrates in contact with the oil 30 in the cylinder. The cylindrical 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 and has a shaft holder. 20 and the cylindrical cushion 22 are turned large and flow up and down. Therefore, the vibration transmitted to the chassis is attenuated by the resistance that the cushion 22 formed in the shaft holder 20 contacts the oil 30, and thus is not transmitted or weakly transmitted to the deck supported by the damper 10 and the tension spring. Delivered and quickly destroyed.

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 crust 28 coated on the outer circumferential surface of the cushion 22 has elasticity, even if some of the outer surface of the annular contact with the body 12, pressure evenly across the entire cushion 22. In addition, the cushion 22 is elastically supported by the divided piece 26 formed perpendicular to the portion in contact with the body 12 to attenuate the impact, and is embedded in the chamber 24 formed on the left and right sides of the divided piece 26. The oil 30 is compressed and elastic to attenuate the impact. Subsequently, when the cushion 22 is separated from the body 12, the restoring force by the elasticity of the crust 28 surrounding the outer circumferential surface of the cushion 22 acts, and the divided piece 26 and the oil 30 of the cushion 22 act. The restoring force acts on the elasticity, and the contracted portion expands and its shape is returned to its original shape.

Accordingly, the cushion 22 rapidly attenuates the vibration of the fixed shaft 20 by elasticity of its own elasticity and the expansion and contraction of the crust 28 coated on the outer circumferential surface and the oil 30 contained in the chamber 24, so that the vibration is decked. Makes the deck stabilize quickly by allowing it to be delivered weakly.

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. Cylindrical cushion 22 formed in the vertical and horizontal directions, respectively, the partition piece 26 forming a plurality of chambers 24 which are externally blocked on the outer circumferential surface of the shaft holder 20 into which the fixed fixed shaft 40 is inserted. And a damping structure of the damper 10 in which oil 30 is injected into each of the chambers 24, and a metal crust 28 is coated on an outer circumferential surface of the cushion 22 to improve damping force. Since the deck is quickly stabilized by the vibration attenuation action of the shaft holder 20 having the cylindrical cushion 22 formed thereon, the optical pickup actuator installed in the deck forms the focus of the laser light on the disk in a stable posture, thereby improving the recording of the disk. Have the effect to .

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 into the center from one side of the body 12 is immersed, On the outer circumferential surface of the shaft holder 20 is divided partition 26, which forms a plurality of chambers 24 whose exteriors are blocked, with cylindrical cushions 22 formed in the vertical and horizontal directions, respectively. 24) Oil (30) is injected into the damping structure of the damper for the CD player, characterized in that the coating of the metal crust (28) on the outer peripheral surface of the cushion (22).