KR19990084261A - Noise reduction device for disc player - Google Patents

Abstract

A disk player noise damping device for attenuating noise generated by air flow in a housing when a disk accommodated in a disk tray and inserted into a housing is rotated by a rotation driving source installed in the housing, the noise damping device for a disk player facing the disk of the disk tray. Disclosed is a disk player noise damping device, characterized in that the intaglio and / or embossed predetermined shape pattern is formed to smooth the air flow in the housing to attenuate the noise.

Description

Noise reduction device for disc player

The present invention relates to a noise reduction device for a disc player, and more particularly, to a noise reduction device for a disc player that can effectively attenuate noise generated by air flow in a housing during rotation of the disc.

In general, a disc player is a recording / playback apparatus for recording information on a disc which is a recording medium or reproducing the recorded information, such as a CD-ROM, a digital multi-function disc player (DVDP), or the like. One example of such a disc player is shown in FIG.

Referring to FIG. 1, a disc player includes a housing 10 and a disc tray 20 for receiving the disc 1 and moving it into the housing 10. The disc tray 20 is installed to be allowed to enter and exit the housing 10. The housing 10 has a turntable 11 on which the disk 1 inserted by the disk tray 20 is seated, and a spindle motor 12 for driving the disk 1 seated on the turntable 11. ) Is installed. In addition, the housing 10 is provided with a clamping member 13 for clamping the disk 1 and an optical pickup 14. The clamping member 13 is inserted into the housing 10 to clamp the disk 1 seated on the turntable 11 to maintain its position. The optical pickup 14 is provided to be movable in the radial direction of the disk 1 as recording and reproducing means for irradiating light onto the disk 1 to record information or to reproduce the recorded information.

On the other hand, the disc player having the above configuration has a turntable (1) by the rotational driving force of the spindle motor 12 in the state in which the disc 1 is inserted into the housing 10 and clamped during the recording and reproducing operation of the information on the disc 1. 11) is rotated together. Then, the optical pickup 14 is irradiated with light while the optical pickup 14 is moved in the radial direction of the disk 1, thereby recording information or reproducing the recorded information. At this time, as shown in Figure 2, when the disk 1 is rotated in the direction of theta (θ), the air between the disk 1 and the clamping member 13 and the air between the disk tray 20 is theta It flows in the direction of (θ) and the direction of the arrow (R). Here, the pressure distribution of the air flowing in the theta (θ) direction has a non-uniform value, and thus air flow in the theta (θ) direction also has a non-uniform flow form. In this way, the irregularly flowed air hits the housing 10 and impacts it, causing unnecessary noise due to the vibration of the housing 10. In addition, when the air flowing in the direction of the arrow (R) touches the housing 10, the flow direction thereof changes in the direction of the arrow (r) and is mixed with the air flowing in the direction of theta (θ), whereby the flow of air More irregularities result in increased noise. In order to attenuate the noise generated as described above, a conventional sound absorbing member 18 that can absorb the noise inside the housing 10 is installed to attenuate the noise. The sound absorbing member 18 generally has a material and structure such as a well-known sponge, and is designed and manufactured in consideration of a predetermined rotational speed of the disk 1, and the inside of the housing 10 by an adhesive or a double-sided tape. Is attached to.

However, the conventional noise reduction device for a disc player as described above has a disadvantage in that the cost is high and the assembly process is complicated because the sound absorbing member 18 manufactured separately is attached to the housing 10. In addition, considering that the rotational speed of the disk 1 may be variously changed according to the position and posture of the housing 10, the sound absorbing member 18 designed for the predetermined rotational speed of the disk 1 may be a disk. (1) There is a limit to effectively attenuating noise corresponding to various frequency ranges according to the change of rotation speed.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a noise reduction device for a disc fryer that is capable of effectively attenuating noise generated by air flow in a housing by a simple structure.

1 is a schematic partial cutaway perspective view of a disc player to which a conventional noise reduction device is applied.

FIG. 2 is a schematic diagram for explaining the operation of the disc player shown in FIG. 1; FIG.

3 and 4 are schematic diagrams for explaining a noise reduction device for a disc player according to an embodiment of the present invention.

FIG. 5 is a schematic cross-sectional view taken along the line VV of FIG. 3. FIG.

6 is a schematic view for explaining another embodiment of the pattern shown in FIG. 3;

7 is a schematic rear view of the clamping member shown in FIG. 3.

FIG. 8 is a schematic cross-sectional view taken along the line VII-VII of FIG. 7; FIG.

9 to 12 are schematic diagrams for explaining a noise reduction device for a disc player according to another embodiment of the present invention.

14A to 14H are schematic views for explaining a noise reduction device for a disc player according to another embodiment of the present invention.

15 and 16 are schematic diagrams for explaining the operation of the noise reduction device for a disc player according to an embodiment of the present invention.

<Description of Symbols for Major Parts of Drawings>

1..Disk 30..Housing

32. Turntable 34. Motor

36. Optical pickup 40. Disc tray

42. Tray body 44. Disk housing member

50. Clamping member 52. Holder

54. Elastic member

110,120,130,140,150,160..pattern

112,122 Concentric Circle Pattern 132.Spiral Pattern

142 Radial pattern 152 Circular pattern

162. Dimple pattern 200. Sound absorbing member

Noise reduction device for a disc player according to the present invention for achieving the above object is the noise generated by the air flow in the housing when the disc is accommodated in the disc tray and the disc inserted into the housing is rotated by the rotation drive source installed in the housing In the noise damping device for a disc player for attenuating the noise, a surface of the disc tray facing the disc is formed with an intaglio and / or embossed predetermined shape to smooth the air flow in the housing to attenuate the noise. It is characterized by being able to.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 is a schematic diagram showing a disk player to which the noise attenuation apparatus is applied according to an embodiment of the present invention.

Referring to the drawings, the disc player clamps the housing 30, the disc tray 40 for moving the disc 1 as a recording medium into the housing 30, and the disc 1 carried into the housing 30. It comprises a clamping means and a noise damping device.

In the housing 30, a turntable 34 on which the disk 1 is mounted, and a motor 32 for supporting the turntable 34 and rotating the disk 1 are installed. By the rotational driving force of the motor 32, the turntable 34 and the disk 1 are rotatable together. In the housing 30, an optical pickup 36 is provided which is a recording / reproducing means for storing information on the disk 1 or reproducing the stored information. The optical pickup 36 is provided in the housing 30 so as to reciprocate in the radial direction of the disk 1, and irradiates the disk 1 with light, thereby performing a recording / reproducing operation.

The disc tray 40 includes a tray body 42 and a disk receiving member 44 coupled to the tray body 42. The tray body 42 is installed in and out of the housing 30 by a predetermined moving means. The disk accommodating member 44 is for accommodating the disk 1, and is mounted on the tray body 42 so as to be lifted and lowered. That is, when the disc tray 40 receives the disc 1 and is inserted into the housing 30, the disc receiving member 44 is provided with a tray body (1) so that the disc 1 can be seated on the turntable 34. 42) is moved downward, i.e., downward.

Meanwhile, in the present embodiment, only the case where the disk receiving member 44 is installed so as to be accessible and spaced apart from the tray body 42 is described and illustrated. However, the disk tray 40 includes the tray body 42 and the disk receiving member ( 44 may be integrally formed. In this case, the disc tray 40 itself is installed to be movable downward in the housing 30, or the motor 32 and the turntable 34 move upward instead of the disc tray 40 not moving up and down. It may be installed as possible.

As shown in FIG. 4, the clamping means is for clamping the disk 1 seated on the turntable 34 to be held in the housing 30 to maintain its position and posture, and the clamping member 50 and the holder. 52 and an elastic member 54.

The clamping member 50 is installed in the housing 30 so as to be movable, and generally has a plate structure, and supports the holder 52 and the elastic member 54. The holder 50 is movably installed on the clamping member 50, is in close contact with the disk 1 seated on the turntable 34, and rotates together when the disk 1 is rotated. The elastic member 54 is provided on the clamping member 50 to elastically press the holder 52 toward the disk 1 while preventing the holder 52 from being separated from the clamping member 50. .

The noise attenuating device is to attenuate noise generated by air flow in the housing 30 when the disk 1 rotates. The pattern 110 has a predetermined shape on the disk tray 40 and the clamping member 50. Is implemented by forming 120).

First, referring to the disc tray 40, an engraved pattern 110 is formed on the top surface 44a of the disc receiving member 44 facing the disc 1. The pattern 110 is to guide the irregular air flow, which is the main cause of the noise generated when the disk 1 rotates, so as to smoothly flow. The first embodiment of the pattern 110 is shown in FIG. As shown, the plurality of concentric circular patterns 112. Each of the concentric circular patterns 112 is formed by using any point located on the line of rotational center C ′ of the disk 1 as the origin C. FIG. As shown in FIG. 5, each of the concentric circular patterns 112 has the same width a and depth h, and the distance between the origin C at each width center is different. Do. Here, each of the concentric circular patterns 112 has a rectangular cross-sectional shape, and a predetermined interval b is formed between each of the concentric circular patterns 112. Here, it is preferable that the width a of the concentric circular patterns 112 and the space b therebetween are equally formed (a = b) so that the pattern 110 can effectively control the air flow. .

In addition, as shown in FIG. 6, the distance b between each of the concentric circular patterns 112, that is, the distance between the width center of the concentric circular patterns 112 and the width center of the adjacent concentric circular patterns 112. By forming a pattern 115 such that the distance b gradually increases from the inner circumference A to the outer circumference B so that is different from each other (b1 <b2 <b3). (B) may be gradually controlled.

Meanwhile, in the present exemplary embodiment, the concentric circular pattern 112 is formed to be drawn in with respect to the upper surface 44a, but this is merely an example, and is formed to protrude from the upper surface 44a, or the upper surface 44a. It is also possible to form a mixture of the embossed pattern and the engraved pattern for. When the disc tray 40 is made of a material such as plastic, the pattern 110 may be formed by injection molding or painting. In addition, when the portion of the pattern 110 is formed, that is, the disk receiving member 44 is made of a material such as metal, the pattern 110 is a laser processing, NC (NC) for the receiving member made of metal It goes without saying that it can be formed by processing by machining, plating, die casting, etching, or the like.

In addition, a pattern 120 engraved with respect to the back surface 50a is formed on the back surface 50a facing the disk 1 of the clamping member 50, similarly to the top surface 44a. As shown in FIGS. 7 and 8, the pattern 120 includes a plurality of concentric circular patterns having the origin C as a point located on the line of rotational center C ′ of the disk 1. 122). The concentric circular patterns 122 also have a predetermined depth h and a width a, and a predetermined interval b is formed between the concentric circular patterns 122. On the other hand, since the shape, structure and processing method of the pattern 120 is the same as the shape, structure and processing method of the pattern 110 provided on the upper surface 44a described above, detailed description thereof will be omitted. 3 and 4 illustrate that the patterns 110 and 120 are formed at the same time on the disc tray 40 and the clamping member 50, this is merely illustrative, and the disc tray 40 and It is also possible to form the patterns 110 and 120 only on one side of the clamping member 50. In addition, in the present exemplary embodiment, the clamping member 50 is installed in the housing 30. For example, when the clamping member 50 is integrally formed on the turntable 11, such as a slim disc player, The pattern 110 may be formed only on the disc tray 40, and / or the pattern 110 may be formed on the inner surface of the disc tray 40 and the housing 30 facing the disc 1.

Hereinafter, another embodiment of the patterns 110 and 120 will be described with reference to FIGS. 9 to 13. Here, the patterns applicable to the clamping member 50 and the disc tray 40 at the same time will be described in detail by taking the disc tray 40 as an example for convenience of description.

Referring to FIG. 9, the second embodiment of the patterns 110 and 120 is a pattern 130 provided in a spiral shape on the top surface 44a of the disk receiving member 44. The pattern 130 has one spiral pattern 132 engraved with respect to the upper surface 44a. The helical pattern 132 has a predetermined width and is preferably formed on the upper surface 44a so that its center C is located on the line of rotational center C 'of the disk 1. In addition, in the present embodiment, the spiral pattern 132 is formed to gradually increase the radius from the center (C) clockwise, it may be formed to increase the radius in the counterclockwise direction.

In addition, the third embodiment of the patterns 110 and 120 is a pattern 140 formed radially on the upper surface 44a of the disk receiving member 44. The pattern 140 includes a plurality of radial patterns 142 radially engraved with respect to the upper surface 44a at a point C located at the line C 'on the rotation center C ′ of the disk 1. ) In addition, in the present embodiment, the radial patterns 142 are formed to be curved in the counterclockwise direction, but it is also possible to be curved in the counterclockwise direction. In this way, the curved radially formed radial pattern 142 guides the air around the disk 1 to flow away from the center C in the housing 30.

In addition, according to the fourth embodiment of the patterns 110 and 120, as illustrated in FIG. 11, a pattern including a plurality of circular patterns 152 on the top surface 44a of the disk receiving member 44 ( 150). Each of the circular patterns 152 has a predetermined width and is formed in a different diameter so that the circular patterns 152 are inscribed or inscribed with each other. As such, the pattern 150 in which the circular patterns 152 are inscribed or circumscribed with each other guides the air around the disk 1 to flow smoothly from the inner circular pattern to the outer circular pattern.

In addition, in the fifth embodiment of the patterns 110 and 120, as illustrated in FIGS. 12 and 13, the plurality of dimple-shaped patterns 162 formed on the upper surface 44a of the disk receiving member 44. Pattern 160 having a. Each of the dimple-shaped patterns 162 is engraved with respect to the upper surface 44a and each has a predetermined width and a predetermined depth. Here, each of the dimple-shaped patterns 162 is formed to vary in depth and width, such as, for example, the surface of a golf ball, and the number and arrangement may be determined by computer simulation considering air flow. The dimple-shaped pattern 162 may each independently control the flow of air smoothly, and a plurality of the dimple patterns 162 may smoothly control the air flow.

In the present embodiment, the disk receiving member 44 and the clamping member 50 have been described with an example in which patterns 110 and 120 having the same concentric circular patterns 112 and 120 are formed. It is also possible to form a combination of the patterns of the various shapes shown in Figs. 9 to 12 so that different shapes of patterns are formed on each of the member 44 and the clamping member 50.

Meanwhile, various embodiments of the cross-sectional shapes of the patterns 110, 120, 130, 140, 150 and 160 described above will be described with reference to FIGS. 14A to 14H. Here, for convenience of explanation, the cross-sectional shape of each pattern that can be applied to the disc tray 40 and the clamping member 50 at the same time will be described as the disk receiving member 44 as an example.

First, referring to FIG. 14A, a plurality of first notched patterns 311 engraved in a notch shape with respect to the upper surface 44a of the disk receiving member 44 is provided. Each of the first notched patterns 311 has a predetermined width, and has a cross-sectional shape symmetrical with respect to the center of the width thereof.

Referring to FIG. 14B, the disk receiving member 44 is provided with a plurality of first wedge-shaped patterns 312 embossed in a wedge shape with respect to the upper surface 44a. Like the first notched pattern 311, the first wedge-shaped pattern 312 has a predetermined width and has a cross-sectional shape symmetrical with respect to the width center thereof.

Referring to FIG. 14C, a plurality of second notched patterns 313 engraved in a notch shape with respect to the upper surface 44a of the disk receiving member 44 are formed. Each of the second notched patterns 313 has a predetermined width and has a cross-sectional shape that is asymmetrical with respect to the width center thereof.

In addition, referring to FIG. 14D, a plurality of second wedge-shaped patterns 314 embossed in a wedge shape with respect to the upper surface 44a are formed on the disk receiving member 44. Like the second notched pattern 313, the second wedge-shaped pattern 314 has a predetermined width and has a cross-sectional shape that is asymmetrical with respect to the center of the width thereof.

14E, the disk receiving member 44 has a plurality of first curved patterns 315 engraved in a curved shape with respect to the upper surface 44a. The first curved pattern 315 has a predetermined width and has a cross-sectional shape that is symmetrical with respect to the width center thereof.

In addition, as illustrated in FIG. 14F, it is also possible to form a plurality of second curved patterns 316 that are curved and embossed with respect to the upper surface 44a. Like the first curved pattern 315, the second curved pattern 316 has a predetermined width and has a cross-sectional shape that is symmetrical with respect to the width center thereof.

14G, the disk accommodating member 44 is provided with a plurality of double type intaglio patterns 317 engraved in a double type W shape with respect to the upper surface 44a. Each of these W-type intaglio patterns 317 has a predetermined width and has a cross-sectional shape that is symmetrical with respect to the width center thereof.

In addition, as shown in FIG. 14H, a double type embossed pattern 318 embossed in a double type W is formed on the upper surface 44a of the disk receiving member 44. Like the W-type intaglio pattern 317, the W-type relief pattern 318 has a cross-sectional shape that has a predetermined width and is symmetrical with respect to the width center thereof.

Here, although only the cross-sectional shape of the pattern shown in FIGS. 14A to 14H has been described in detail, it is a matter of course that a pattern having various cross-sectional shapes may be formed in addition to the described patterns. In addition, it is also possible to form a pattern by properly mixing the above-described patterns.

Hereinafter, the operation of the noise reduction device for the disc player according to the present embodiment will be described with reference to FIGS. 3, 4, 15, and 16.

First, as shown in FIG. 4, in the state where the disk 1 moved into the housing 30 and seated on the turntable 34 is clamped by the clamping member 50, information is recorded on the disk 1. If the user wants to reproduce the recorded information, the motor 34 is driven to rotate the disk 1 by the rotational force. At this time, the disk 1 is rotated together with the turntable 34 and the holder 52 at a predetermined speed, and the optical pickup 36 irradiates light to the disk 1 rotated as described above, thereby recording and reproducing. This is done. At this time, as the disk 1 is rotated, the air in the housing 30, in particular, between the disk 1 and the clamping member 50 and between the disk tray 40 and the disk tray 40 as shown in FIG. Direction, theta (θ) direction and the axis (Z) direction, up and down at a predetermined speed. Here, the pressure distribution of the air flowing in the theta (θ) direction has a non-uniform value, and the air flow in the theta (θ) direction also has an irregular flow form. The air flowing in this way hits the housing 30 and various components installed therein, and the impact thereof causes vibration to occur in the housing 30 and the like, thereby generating noise. The main cause of the noise caused by the vibration of the housing 30, etc. is that the flow of air during the rotation of the disk 1 is not regular and abnormal flow. Here, since the flow of air in the housing 30 has been described above with reference to FIG. 2, a detailed description thereof will be omitted.

On the other hand, the pattern 110, 120 formed in the disc tray 40 and the clamping member 50 in the process of air flow as described above to suppress the flow of air in the direction of the arrow (R) to reduce the flow rate To attenuate the impact due to the flow rate of air delivered to the housing 30. In addition, the amount of air flowing in the direction of the arrow (R) and the flow direction is changed in the direction of the arrow (R) is also reduced to reduce the amount of irregular air flow generated by mixing with the air flowing in the direction of theta (θ). do. In addition, the patterns 110 and 120 guide the air flowing irregularly in the direction of theta (θ) to smooth the flow as shown in FIG. 16 to reduce the flow of irregular air which is the main cause of the noise. This effectively attenuates the noise. As such, the patterns 110 and 120 are formed on the disc tray 40 and the clamping member 50 in a state where components for additional noise attenuation, such as the conventional sound absorbing member 18 (see FIG. 1), are excluded. By attenuating the noise, the manufacturing process of the disc player is simplified and the cost can be reduced.

On the other hand, even if the manufacturing cost is similar to the prior art, to effectively attenuate the noise caused by the rotation of the disk 1, as shown in Figure 15, the conventional sound-absorbing member 200 inside the housing 30 It is also possible to install more on.

According to the noise damping device for a disc player according to the present invention as described above, by the pattern formed on the disc tray and the clamping member has a similar sound attenuation effect when using a conventional sound absorbing member. However, unlike the prior art, by excluding a separate component, there is an advantage that the structure can be simplified and the manufacturing cost can be reduced.

In addition, after the pattern is formed on the disc tray and the clamping member, by further providing a sound absorbing member as in the prior art, the noise attenuation effect can be further enhanced.

Claims (11)

A noise damping device for a disc player for attenuating noise generated by air flow in a housing when a disc accommodated in a disc tray and inserted into a housing is rotated by a rotation driving source installed in the housing. Noise reduction device for a disc player, characterized in that the intaglio and / or embossed predetermined shape pattern is formed on the surface of the disc tray facing the disc to smooth the air flow in the housing to attenuate noise . The method of claim 1, The clamping member for clamping the disk is installed in the housing, A noise damping device for a disc player, characterized in that a pattern of an intaglio and / or embossed predetermined shape is formed on a surface facing the disc of the clamping member to smooth the air flow in the housing to attenuate the noise. . The method according to claim 1 or 2, Each of the patterns has a predetermined width and has a plurality of concentric circular patterns, each of which has a predetermined point facing the center of rotation of the disk, wherein the width center of each concentric circular pattern and the radius between the origin are different from each other. Noise reduction device for disc player. In claim 3, And a width between the concentric circular patterns and a distance between adjacent concentric circular patterns is the same. The method of claim 3, And a distance between the width center of the concentric circular pattern and the width center of the adjacent concentric circular patterns is different from each other. The method according to claim 1 or 2, The pattern has a predetermined width and is a helical pattern centered on any point facing the center of rotation of the disk, the disc player noise, characterized in that to smoothly guide the flow of air away from the center Damping device. The method according to claim 1 or 2, The pattern is a disk player characterized in that it is able to smoothly guide the flow of air from the reference point to a plurality of radial patterns formed radially with respect to any point facing the center of rotation of the disk as a reference point Noise reduction device for The method of claim 7, wherein And each of the radial patterns is curved in a clockwise or counterclockwise direction. The method according to claim 1 or 2, The pattern is for a disc player, characterized in that a plurality of circular patterns each having a predetermined width and having a different radius are inscribed or inscribed with each other such that air guided by the inner circular pattern is guided toward the outer circular pattern. Noise reduction device. The method according to claim 1 or 2, The pattern is a plurality of dimple-shaped patterns each having a predetermined width and a predetermined depth, each dimple-shaped pattern, characterized in that it is possible to smoothly control the air flow independently of the disc player. The method according to claim 1 or 2, The housing is a noise damping device for a disc player, characterized in that the dustproof sound absorbing member is installed.