KR100278693B1 - Reproducing unit support of disc player - Google Patents

Abstract

The present invention provides a disc reproducing apparatus having a simple and easy structure which increases the braking force of the oil damper against excessive displacement of the device frame and the disc reproducing unit, thereby effectively protecting the disc reproducing unit from a sudden external shock. To this end, the damper member 10 and the engaging member 23 are sandwiched and the disk regeneration unit 3 is provided to move freely in the apparatus frame S. FIG. The damper member is formed of a cylindrical elastic member with both ends closed and filled with a viscous fluid therein, and the main portion of the damper is held by the fixing member 12 and a fitting groove 11 is formed at one end thereof. . The engagement portion includes a shaft portion 23b that is fitted into the engagement groove portion of the damper member and is elastically tightly fixed. A tapered portion 23a is provided in the base portion on which the shaft is mounted to elastically deform in contact with one end surface of the damper member.

Description

Reproducing unit support of disc player

1 is a perspective view showing a schematic configuration of a disc reproducing apparatus according to an embodiment of the present invention.

Figure 2 is a perspective view showing the back side structure of the embodiment apparatus.

3 is a view showing a connection structure between an oil damper and a shaft.

4 is a view showing a state in which the shaft is pushed against the oil damper.

5 shows the characteristics of the resistance value change with respect to the displacement of the oil damper.

6 is a view showing the shape of the tapered portion, (a) is a front view, (b) is a side view.

7 is a view showing a modification of the tapered portion, (a) is a front view, (b) is a side view.

8 is a side view showing a modification of the tapered portion.

9 is a side view showing a modification of the tapered portion.

10 is a view showing a connection structure between the oil damper and the engagement pin in the conventional apparatus.

Fig. 11 is a view showing a state where the engaging pin is pushed against the oil damper in the conventional apparatus.

Fig. 12 is a diagram showing the characteristics of the resistance value change with respect to the displacement of the oil damper in the conventional apparatus.

<Description of the symbols for the main parts of the drawings>

S: Chassis of the device frame 3: Frame member of the disc playback unit

10: oil damper 11: engaging groove

21: engaging member 23a: tapered portion

23b: shaft part

The present invention relates to a disc reproducing apparatus in which a disc reproducing unit is freely installed in a device frame with a predetermined elastic force to protect the disc reproducing unit from external shocks and the like.

A disc reproducing apparatus for reproducing recording information of a disc recording medium such as a compact disc (CD) usually includes a disc reproducing unit equipped with a turntable or a pickup, which is freely moved to a device frame by inserting a damper member such as a coil spring. The invention has been devised so that an influence such as external vibration or impact on the frame does not affect the disc reproducing unit. In particular, in the on-vehicle disc reproducing apparatus, since external vibration is easily applied normally, various studies have been made on a shock absorber (structure) for protecting the disc reproducing unit.

By the way, as a damper member used for this kind of shock absorber, what is called an oil damper using a viscous fluid as disclosed, for example, in Unexamined-Japanese-Patent No. 61-76593 or Unexamined-Japanese-Patent No. 62-164890 is known. This oil damper is coaxial with the engaging groove which is dug inwardly in the center of one end, mainly composed of a cylindrical body made of elastic material (for example, butyl rubber) filled with viscous fluid such as silicone oil inside and closed at both ends. It has a designed structure.

However, this oil damper is installed in the device frame by inserting, for example, a flange portion of the wall thickness provided on the circumferential surface of the tube, or by inserting a cylindrical support for maintaining a constant circumferential surface of the tube as shown in FIG. It is installed on the device frame. In addition, in FIG. 10, S shows a chassis of the apparatus frame, and 01 shows an oil damper whose surface circumferential surface is kept in a constant shape by a supporter 03 fastened by screwing to the chassis S. . 05 denotes a frame member of the disc reproducing unit.

The elastic (buffered) support for the device frame of the disc reproducing unit, into which the oil damper 01 is fitted, is provided with a metal engaging pin 06 mounted on the frame member 05 of the disc reproducing unit as described above. It is made by inserting into the engaging groove part 02 formed in the center part of one end surface of the oil damper 01 provided in S), and fixing it to one end surface of the oil damper 01. And the installation of the metal engagement pin 06 with respect to the frame member 05 is performed using means, such as caulking.

The oil damper 01 is such that the elastic (buffered) support of the disc reproducing unit by connection with the engaging pin 06 is, for example, at both sides of the frame member 05 of the disc reproducing unit. It takes place in four positions with the rear end side in total. In particular, the oil dampers 01 for supporting both sides of the frame member 05 face each other with one end face formed with the engaging portion 02, and the disc regenerating unit is placed in a normal position with each oil damper 01 neutral. Installed in pairs to hold on.

In this way, the disc reproducing unit (frame member) 05 elastically supported by inserting the oil damper 01 in the chassis S of the device frame receives external vibration applied to the device frame and is relatively to the device frame. Position displacement. At this time, the oil damper 01 is mainly engaged with its axial direction (engaging groove 02) and tightly fixed by a viscous shape of the silicone oil filled in the cylindrical body and elastic deformation of both ends thereof. It gives a load (forced action) against the displacement force in the axial direction of 06) and absorbs the external vibration.

That is, when a force in the transverse direction (axial direction of the oil damper 01) is applied to the device frame by external vibration, the force is transmitted to the disc regeneration unit with the oil damper 01 fitted. At this time, the oil damper 01 elastically bends both end surfaces thereof as shown in FIG. 11 to absorb the force and exhibit braking action, and then returns to the original state shown in FIG. 10 by the elastic recovery. come. In addition, when the force in the opposite direction is applied, both ends of the oil damper 01 are elastically bent in the opposite direction to absorb the force and exhibit braking action, and then the original state shown in FIG. 10 by the elastic return force. Return to With respect to such an oil damper 01, the oil dampers 01 installed in opposite directions in pairs at positions opposite to this act exactly oppositely.

The resistance value (braking load) of the oil damper 01 according to the relative positional change between the device frame and the disc reproducing unit is determined mainly by the viscosity of the silicone oil filled therein, as shown in FIG. Similarly, for a certain moving displacement force, it shows a nearly constant resistance value determined by the displacement speed. That is, the viscosity of the silicone oil takes a resistance value (braking load) according to the strength of the position displacement of the oil damper 01 and is almost constant despite the displacement amount of the position. In addition, it provides weak braking force for gentle position change and strong braking force for sudden position change.

However, if a large external force is suddenly applied to the device frame and the position displacement force exceeds the braking force due to the viscosity of the silicone oil, the above-mentioned almost constant braking load (braking value) of the oil damper 01 cannot absorb all of it. As a result, the oil damper 01 may be excessively deformed by deflecting both sides, and the relative position between the device frame and the disc reproducing unit may be excessively displaced. Then, as shown in FIG. 11, one end surface of the engagement groove portion 02 side of the oil damper 01 collides with the frame member 05, and causes a large impact on the disc reproducing unit. This shock causes an unexpected situation such as damage to the pickup mounted on the disc reproducing unit.

The present invention has been made in view of the above circumstances, and an object thereof is to increase the braking force of the oil damper against excessive displacement of the device frame and the disc reproducing unit, thereby effectively protecting the disc reproducing unit from a sudden external shock. Disclosure of the Invention It is to provide a disc player having a simple and easy structure.

The present invention relates to a disc reproducing apparatus provided by elastically supporting and removably installing a disc reproducing unit with respect to a device frame, wherein the damper member is filled with a viscous fluid therein and has a fitting groove portion therein. On one side of the disc reproducing unit, at the same time, the other end is provided with a proximal end of an engaging member having a shaft portion, and the shaft portion of the engaging member is fitted to an engaging groove of the damper member, and on one end surface of the damper member. By tightly fixing the device frame and the disc reproducing unit, a damper receiving part is formed between the shaft portion and the base end portion of the engaging member, which forms a tip shape from the base end side to the shaft end portion, and is excessively positioned. The damper member is brought into contact with a portion of the damper member that has been displaced so as to contact the damper member. Is characterized in that that to the elastic displacement.

When the taper member is excessively displaced and the portion provided with the engaging groove is brought into contact with the damper receiving portion provided on the engaging member, the damper receiving part is pushed outward to widen to greatly elastically deform. The elastic deformation of the cylindrical elastic member then acts as a large load on the position displacement of the damper member and brakes the position displacement. This braking force increases as the amount of displacement of the damper member becomes excessive and the amount of the damping member is pushed outward to the outer edge of the opening portion of the engaging groove increases, so that the excessive position displacement of the damper member is effectively suppressed.

As a result, even if a sudden external shock is applied and the relative position of the disc reproducing unit and the device frame is excessively changed by this force, the damper member is elastically returned by a large braking force before the disc reproducing unit and the device frame collide, and thus the collision is caused. Can be easily and effectively prevented and the disc playback unit can be protected.

Hereinafter, a disc reproducing apparatus according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing the whole structure of an embodiment apparatus and FIG. 2 is a perspective view showing a back side structure thereof. In the figure, S is a chassis that forms the frame member of the disc reproducing apparatus and is composed of a top plate and side plates on both sides thereof. It is shaped. A disk insertion port W made of synthetic resin is provided in the front opening part of the disk insertion port side of the chassis S. As shown in FIG.

Inside the chassis S, a disk reproducing unit 3 equipped with a turntable or a pickup is elastically supported as described later and is installed freely. The disc holder 2 is disposed between the disc reproducing unit 3 and the top plate of the chassis S. The disc holder 2 is provided at the opening 1 of the disc insertion frame W in the disc holder 2. The disk CD inserted along the disk surface is to be loaded by a loading device (not shown). The disc is mounted on the turntable of the disc reproducing unit 3 in the state absorbed by the disc holder 2 and rotated integrally with the turntable to reproduce information by pick-up.

By the way, the frame member of the disc reproducing unit 3 is suspended from the top plate of the chassis S by four coil springs 5 fixedly attached to both rear ends and the front of both ends thereof. The tension of these coil springs 5 and the weight of the disc reproducing unit 3 are parallel to each other so that the disc reproducing unit 3 is elastically held in the vertical direction and maintained at the neutral position in the same direction in the normal state. In addition, a pair of coil springs 8 arranged in a horizontal direction is tensioned between the spring mounting portion 7 formed on both sides of the frame member of the disc reproducing unit 3 and the side plate of the chassis S. . By these coil springs 8, the disc reproducing unit 3 is elastically held in the disc insertion direction and is maintained at the neutral position in the same direction in the normal state.

The coil spring 9 placed between the spring mounting portion 7 and the disc holder 2 makes the disc holder 2 abut the upper surface of the disc reproducing unit 3 when the disc is regenerated, thereby simultaneously fixing them integrally. The disk housed in the disk holder 2 is mounted on the turntable of the disk playing unit 3.

However, as shown in FIG. 2, four oil dampers 10 are provided in pairs in opposite directions on opposite sides of the front end and the rear end, as shown in FIG. Although these oil dampers 10 and their mounting structure will be described later, the shafts of the engaging members respectively provided at the corresponding positions of the frame members of the disc regeneration unit 3 are fitted into the engaging grooves provided at one end thereof and tightly fixed. have. The oil damper 10 mainly supports the disc regeneration unit 3 elastically in a direction orthogonal to the disc insertion direction of the disc holder 2 and maintains a neutral position with respect to the same direction in a normal state. It is. The oil damper 10 is elastically supported by the coil springs 5 and 8 so that the disk regeneration unit 3 can move in three dimensions with respect to the chassis S. FIG.

However, the oil damper 10 is a cylindrical elastic member, in which both ends are closed and filled with silicon oil as a viscous fluid therein, specifically, a cylindrical body made of butyl rubber, as shown in FIG. 3. It has a structure mainly. And in the center of one end surface of the oil damper 10 is formed an engaging groove 11 which is dug inward, the circumference of the engaging groove 11 is swelled up, the other end is a hydraulic pressure surface (受壓) Surface). The oil damper 10 is filled in the cylindrical part of the cylinder 13 of the support 13, and is supported so that the cylindrical part circumferential surface is held in a constant shape, and only its both ends are elastically deformed in the plane direction. In this way, the oil damper 10 held in the support 13 is fixed to the chassis S by fixing the support 13 to the chassis S.

On the other hand, the engaging member 21 made of a synthetic resin having a cylindrical shaft portion 23b fitted to the engaging groove 11 of the oil damper 10 and fixed in close contact with the elastic damper 10 has its base part as a disc regeneration unit. It is fixed by tightening screws to the frame member of (3). This taper portion 23a is provided between the base portion of the engaging member 21 and the shaft portion 23b with a truncated conical tapered portion 23a extending from the base portion to the shaft portion 23b. In the embodiment, the base portion is formed integrally with the shaft portion 23b coaxially, but may be provided with other members.

In this way, the shaft portion 23b of the engaging member 21 fixed to the disc reproducing unit (frame member) 3 and the support 13 are fitted to engage the oil damper 10 fixed to the chassis S. By the tightly fixed connection with the groove 11, the disc regeneration unit 3 is elastically supported by the oil damper 10 with respect to the chassis S, and the disc regeneration unit 3 in its normal state is supported. Will remain in a neutral position.

The device of this embodiment is characterized by having the above-mentioned truncated taper portion 23a between the base portion of the engaging member 21 and the shaft portion 23b, and at one end of the oil damper 10. The engagement groove part 11 which fits and fastens the shaft part 23b is provided, and the circumference is made to swell. This taper portion 23a exhibits a function of reinforcing the strength of the shaft portion 23b that stands up at the base of the engaging member 21, but the disc reproducing unit 3 is relatively relative to the chassis S. Excessively displaced, and as a result, when the chassis S and the disc reproducing unit 3 come close to each other and the shaft portion 23b enters the engagement groove portion 11 as shown in FIG. 4, the engagement groove portion The action of giving a great load resistance against the displacement of the oil damper 10 in contact with the circumferential surface of the opening of (11).

That is, as shown in FIG. 5, the oil damper 10 exhibits almost constant displacement resistance characteristics in the normal operating range mainly by the viscosity of the silicon oil filled therein. When the oil damper 10 is excessively displaced and the taper portion comes into contact with the edge portion of the engagement groove portion 11, the edge portion of the engagement groove portion 11 is pushed and widened by the taper portion 23a. Accordingly, a large load is caused by the elastic deformation of butyl rubber, which is a material for forming the cylindrical body. As a result, the resistance to displacement of the oil damper 10 is set to gradually increase at a time point exceeding the normal operating range, and this load is applied so that a large braking is applied to the excessive positional change of the oil damper member 10. It is.

In this way, according to the disk regenerating unit 3 elastically retained inside the chassis S by inserting the above-described oil damper 10, a sudden external shock is applied and the disc regenerating unit 3 is positioned largely with respect to the chassis S. When the displacement is attempted, since a large amount of braking is applied to the displacement by the action of the taper portion 23a described above when the displacement amount becomes excessive, a collision between the disc reproducing unit 3 and the chassis S is prevented, Or the impact force is greatly weakened. As a result, even if a sudden impact is applied, the impact force does not apply to the disc reproducing unit 3, and it is possible to effectively prevent the pickup and the like.

In particular, a simple configuration in which only the taper portion 23a is provided between the base portion and the shaft portion 23b of the engaging member 21 can give a large load to the excessive position displacement of the oil damper 10. Therefore, the effect is very remarkable.

In addition, in the above-mentioned embodiment, although the taper part 23a of the engagement pin 23 was made into the conical shape of a cross-sectional circular shape as shown in FIG. 6, the planar shape and side shape structure are shown in FIG. Likewise, the lower side may be so-called face machining. The site | part and size of the surface processing can be suitably determined in the range which does not impair the function of the taper part 23a mentioned above. And as shown in FIG. 8, the taper part 23a may be made into staircase shape, and also as shown in FIG. 9, the peripheral wall may be made into the shape which forms the curved surface which protruded outward.

In the embodiment, the main wall surface of the oil damper 10 is held in a constant shape by the support 13, but the circumferential wall surface of the oil damper 10 may have rigidity that cannot be elastically deformed. In addition, the viscous fluid filled in the oil damper 10 may be a fluid other than silicon oil, and the shape and structure of the damper member are not particularly limited.

As described above with respect to the embodiment of the present invention, according to this embodiment, an external force is suddenly applied to the oil damper 10, and one end surface on the side of the engaging concave portion 11 to which the shaft portion 23b is connected is largely dug, and excess. The taper portion 23a abuts against the swelling portion around the engagement groove portion 11 when it is to be displaced in the direction of the engagement groove, and pushes it outward so as to greatly elastically deform the elastic deformation. It acts as a large load and a large braking force. As a result, the braking characteristic of the oil damper 10 is greatly changed by the simple configuration in which the taper portion 23a is simply provided between the base portion of the engaging member 21 and the shaft portion 23b. The position change can be suppressed and the collision between the chassis S and the disc reproducing unit 3 can be effectively prevented.

According to the present invention, the taper portion provided in the engaging member provides a large load to the excessive position displacement of the damper member and suppresses the excessive displacement, thereby preventing a collision between the disc playback unit and the device frame even when a sudden external shock is received. It is simple and easy to effectively prevent and protect the disc playback unit.

Claims (2)

In the reproducing unit supporting device of the disc reproducing apparatus, which is elastically supporting the disc reproducing unit 3 with respect to the device frame S and is installed freely to move, the viscous fluid is filled therein so as to fit at the center of one end. And a damper member (10) which swells the periphery of the engaging groove portion (11), and a shaft portion (23b) which is closely fitted to the engaging groove portion, and at the proximal end thereof from the proximal end thereof. A fastening member 23 having a damper receiving portion 23a, the cross-sectional area of which gradually decreases toward the upper surface thereof, wherein the damper member is provided on one side of the apparatus frame and the disc reproducing unit, and the fastening member is provided on the other side. A reproducing unit support apparatus for a disc reproducing apparatus. The apparatus of claim 1, wherein the damper receiving portion (23a) has a truncated cone shape.