KR100803584B1 - Disk tray - Google Patents

Abstract

The disclosed disc tray has a seating surface on which a disk is seated, and the seating surface has a plurality of cutting portions and a ladder frame portion forming a boundary between the cutting portions, and the ladder frame portion has a center portion at both edge portions thereof. It is configured to have a step. Here, the center portion of the ladder frame portion is preferably further provided with ribs protruding downward. According to such a structure, since the ladder frame portion is strong in the load in the vertical direction, the rigidity of the disc tray is increased, the durability is improved, and the disk drive itself can be made slim by utilizing the cutting portion.

Description

Disk tray

1 and 2 are a plan view showing a conventional disc tray is taken out and drawn in with respect to the housing, respectively;

3 is a plan view briefly showing a disc tray according to an embodiment of the present invention;

4 is a cross-sectional view taken along line IV-IV of FIG. 3;

5 is a cross-sectional view showing the same portion as in FIG. 4 according to another embodiment of the present invention;

6 is a perspective view for explaining the load condition of the stress analysis.

<Description of Symbols for Major Parts of Drawings>

110 ... disc tray 120 ... mounting surface

121,122 ... 1st cutting part, 2nd cutting part 123 ... ladder frame part

123d ... Rib D ... Disc

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc tray, and more particularly, to a disc tray having an improved structure so as to increase rigidity with respect to a vertical load.

In general, a disc drive is a device that records information by reading light from or reads information from a disc, which is a recording medium, and reproduces the information from the disc drive. It is provided. On the other hand, in the case of notebook personal computers, with the demand for miniaturization and slimming, the disk drive itself has been slimmer, and thus the space formed between the disc tray and the housing is becoming narrower.

1 and 2 are plan views illustrating a conventional disc tray in a state in which the conventional disc tray is taken out and retracted from the housing.

Referring to the drawings, the disc tray 1 is provided with a seating surface 2 on which the disc D is seated. The seating surface 2 is provided with a recording / playback apparatus such as a pickup 4 or a spindle motor 5. The cutting part 2a of the empty space is formed so that the main base 3 to be installed may be located. In the above configuration, when the disc tray 1 is inserted into the housing 6, as shown in FIG. 2, the main print board 7 is installed in the housing 6 at the lower portion of the disc tray 1. In order to prevent the main printed circuit board 7 from interfering with the disc tray 1, a constant gap is required. As a result, if the space formed between the disc tray 1 and the housing 6 is reduced in order to reduce the thickness of the disc drive, interference between the disc tray 1 and the main printed board 7 occurs. Therefore, there is a limit in reducing the space formed between the disc tray 1 and the housing 6 for slimming the disc drive.

In order to overcome this limitation, it is necessary to cut the portion A of the disk tray 1 which may cause interference with the main printed board 7, and cut the portion A under the structure of the conventional disk tray 1. The rigidity of the disc tray 1 is lowered. In addition, deformation of the disc tray 1 may cause problems such as contact with the housing 6 when the disc D rotates or malfunction of the disc D.

Therefore, there is a demand for a disc tray having a new structure in which the disc tray is structurally reinforced and its rigidity is increased.

SUMMARY OF THE INVENTION The present invention has been made in view of the above necessity, and an object thereof is to provide a disc tray structurally reinforced to increase rigidity with respect to vertical loads and to reduce injection deformation.

The present invention for achieving the above object is provided with a seating surface on which the disk is seated, the seating surface is provided with a plurality of cutting portions, and a ladder frame portion that forms a boundary between these cutting portions, the ladder frame portion both edges The central part with respect to the part is characterized by having a step.

Here, it is preferable to further include a rib drawn downward in the center portion of the ladder frame portion.

Hereinafter, a preferred embodiment of the disc tray according to the present invention will be described in detail with reference to FIGS. 3 and 4.

As shown in the disk tray 110 of the present invention, a seating surface 120 on which the disk D is mounted is provided, and the seating surface 120 has a first cutting portion 121 and a second cutting portion ( 122) is formed. Here, the first cutting portion 121 is the main printed board (7, Fig. 1, 2) located at the lower portion of the disc tray 110 when the disc tray 110 is inserted into the housing (6, see Figs. 1 and 2). And cut out from the disc tray 110 in order to avoid interference with the disc tray 110, and the second cutting portion 122 is a pickup (4, see Figs. 1 and 2) or a spindle motor (5, see 1 and 2). It is a part cut out from the disc tray 110 so that the main base 3 (refer to FIGS. 1 and 2) in which the recording / playback apparatus is installed is located. In addition, the seating surface 120 includes a ladder frame portion 123 forming a boundary between the first cutting portion 121 and the second cutting portion 122, the ladder frame portion 123 is shown in FIG. As shown, the center portion 123a has a step t with respect to both edge portions 123b and 123c.

According to this configuration, by bringing the ladder frame portion 123 having a relatively weak structure in a layer structure due to the cutting portion 121, 122 of the disk tray 110, the stress (stress) and displacement (for vertical load) displacement can be reduced. The results of the stress analysis for this will be described later in conjunction with another embodiment of the present invention.

5 is a cross-sectional view showing the same site as FIG. 4 according to another embodiment of the present invention.

3 and 5, the ladder frame portion 123 has edge portions 123b, in addition to the center portion 123a being provided with a step t with respect to both edge portions 123b and 123c thereof. A rib 123d protruding downward from the central portion 123a having a step t with respect to 123c is further provided. The rib 123d protruding downward reduces deformation due to injection molding by reducing the cross-sectional change of the disc tray 110.

Here, the rib 123d is formed to protrude only at a portion adjacent to the second cutting portion 122 among the two cutting portions 121 and 122 adjacent to the ladder frame portion 123. Because the disk is not a complete rotational body with respect to the center of rotation, a wobble phenomenon occurs in which the disk moves in the direction of its axis of rotation, so the spindle motor (5, see FIGS. 1 and 2) for rotating the disk This is because the formation of the rib 123d on the near side is more advantageous for reducing the wobble phenomenon. In addition, as shown in FIG. 5, the protrusion height of the rib 123d is equal to the step t of the central portion 123a of the ladder frame portion 123 with respect to both edge portions 123b and 123c. desirable. In this case, since the rib 123d is formed using only the empty space created by the step t without providing a separate space for protruding the rib 123d, the housing 6 (see FIGS. 1 and 2) and the disk are formed. This is because the space between the trays 110 can be taken as little as possible.

Hereinafter, the results of the stress analysis for each of the first and second embodiments of the present invention will be described in detail using Table 1 below. Here, the first embodiment is a case where the center portion of the ladder frame portion has only a step with respect to both edge portions, and the second embodiment is a case where a rib having the same height as the step is protruded to a portion adjacent to the second cutting portion in addition to the step. to be.

Table 1. Results of stress analysis according to each example

Type Displacement (mm) Stress (mN / mm2) When only cutting without step total 1.92E-01 total 4.30E + 03 local 8.74E-02 local 8.29E + 02 First embodiment total 1.94E-01 total 4.69E + 03 local 7.93E-02 local 1.37E + 03 Second embodiment total 1.94E-01 total 4.07E + 03 local 7.73E-02 local 9.20E + 02

From Table 1, the ladder frame portion of the disc tray has a layered structure as in the first embodiment, and as a result, the overall displacement and stress are reduced as compared with the case of only cutting without step. Thus, it is possible to eliminate the weak point against the vertical load. However, it can be seen that stress is concentrated locally. On the other hand, reinforcing the ribs in the leather frame portion of the tray as in the second embodiment it can be seen that both the amount of deformation and the stress is reduced, in particular the local stress concentration is also reduced.

The stress analysis was performed by the finite element method, and the disc tray was made of a composite of PC (Polycarbonate) and ABS (Acrylonitride Butadiene Stylene). In addition, the load conditions applied in the stress analysis will be described with reference to FIG. 6, and a load of 1150 mN is applied to the three bosses 211, 212, and 213 for fixing the main base 3 (see FIGS. 1 and 2). Here, the load of 1150mN is a value obtained by adding the force applied when the disk is mounted on the spindle motor 5 (see FIGS. 1 and 2) and the weight of the disk drive itself, and then dividing it by three. In addition, when the disc tray 110 receives a load, the support members 131 and 132 supporting the disc tray 110 are fixed so that a displacement is applied to the disc tray 110.

As described above, according to the disc tray according to the present invention, since the ladder frame portion has a strong structure against the load in the vertical direction, the rigidity of the disc tray is increased, the durability is improved, and the disc drive itself is made slim by the use of the cutting portion. Can be planned.

It is to be understood that the invention is not limited to that described above and illustrated in the drawings, and that more modifications and variations are possible within the scope of the following claims.

Claims (4)

It has a seating surface on which the disk is seated, The seating surface includes a plurality of cutting parts and a ladder frame part forming a boundary between the cutting parts, And the ladder frame portion has a central portion with respect to both edge portions thereof. The method of claim 1, And a rib protruding downward from the center portion of the ladder frame portion. The method of claim 2, The rib is a disc tray, characterized in that protruding only in a portion adjacent to the side of the cutting portion where the center of rotation of the disk of the two cutting portions adjacent to the ladder frame boundary. The method of claim 2, And the protruding height of the ribs is equal to a step for both edges of the center portion.

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