JP2006190351A - Optical disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk apparatus in which heat generation of a semiconductor element is radiated efficiently. <P>SOLUTION: A main PC board in which the semiconductor element is mounted is attached at a rear part of the drawer. The drawer is formed by a material of which the heat conductivity is good, a heat conduction member having a good heat conductivity is mounted between an IC desired to radiate heat and the drawer. As the heat conduction member, for example, heat conductive rubber is suitable due to elasticity and tight adhesion for the IC being a heating element. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an optical disk device, and more particularly, to a slim optical disk device for mounting on a notebook computer having a heat dissipation structure of a drive IC.

  In general, a drive system IC mounted on an optical disk apparatus generates a large amount of heat, and thus a cooling mechanism is provided inside.

For example, as a cooling measure inside a slim optical disk drive for laptop computers, the heat generated from the driver IC is transmitted from the bottom of the chassis step to the entire chassis, and the chassis cools the wind by the wind generated by the rotation of the disk. An optical disk device having a heat dissipation configuration using a housing has been proposed (see, for example, Patent Document 1).
JP 2000-31478 A

  The internal structure of the optical disk apparatus has also become complicated with recent high-speed / high-frequency transmission, and for example, it is mounted on the side of a mechanical main body (drawer) that slides a substrate on which a driver IC or the like is mounted. From such a mechanical configuration, as in the device disclosed in Patent Document 1, a heat dissipation configuration using an outer casing is adopted so that a substrate on which a semiconductor element is mounted is fixed to the outer casing and IC heat is released. There was a problem that I could not.

  The present invention has been proposed to solve the above-described problems, and it is intended to efficiently transfer heat to the drawer side and efficiently dissipate the heat transferred to the drawer side in the air. Yes.

  According to one aspect of the present invention, a mechanical chassis equipped with a drive mechanism that supports and controls rotation of an information recording medium, a substrate on which a semiconductor element is mounted, and a surface facing the information recording medium, And a drawer formed using a material having good thermal conductivity at least in part, and the semiconductor element is thermally conductive with respect to the portion of the drawer having good thermal conductivity. There is provided an optical disc device characterized in that a heat conducting member having good properties is interposed and brought into contact therewith.

  The drawer preferably has a thermal conductivity at 20 ° C. of 50 W / m · k or more and a specific gravity of 3 or less.

  The drawer material is preferably an aluminum alloy or a magnesium alloy.

  According to the present invention, the heat is efficiently transferred to the drawer side, and the heat convection is induced by the wind velocity near the disk close to and opposed to the drawer to efficiently dissipate the heat transferred to the drawer side in the air. Increase in internal temperature is suppressed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same portions are denoted by the same reference numerals, and redundant description is omitted.

  1 and 2 are exploded perspective views of main parts of an optical disc apparatus according to an embodiment of the present invention. 1 is a perspective view from the back side, and FIG. 2 is a perspective view from the front side. An optical disk device 10 is configured to rotate an optical disk as an information recording medium and read / write data. The optical disk device 10 is mounted with the traverse mechanism chassis 1 and is slidable from an apparatus main body in which the optical disk device 10 is incorporated. The drawer 2 is a base member to be protected, and a bottom plate that protects the mechanical chassis 1.

  A pickup head 4 for reading / writing data and a main PC board 5 are attached to the mechanical chassis 1. On the main PC board 5, a drive IC, a data processing IC, an AMP IC 5a, etc., for driving and controlling the mechanical chassis 1 are mounted. Each of these ICs 5a has a high calorific value.

  FIG. 3 is a cross-sectional view of the main part of the optical disk apparatus.

  The main PC board 5 on which the semiconductor elements are mounted is attached to the rear side of the drawer 2, that is, the host side of the optical disk device 10. In the vicinity of the main PC plate 5, a disk motor 1b for driving the optical disk 1a is disposed. In order to avoid the influence of high speed and high frequency transmission, it is desirable that the main PC board 5 is fixed relatively close to the pickup head 4.

  The drawer 2 is formed of a material having good thermal conductivity, and for example, the thermal conductivity at 20 ° C. is desirably 50 W / m · k or more. In addition, the specific gravity is preferably 3 or less from the viewpoint of reducing the weight of the entire apparatus.

The following [Table 1] compares the drawer material candidates.

  It is preferable to select an aluminum alloy if the thermal conductivity is selected with particular priority, and a magnesium alloy if the overall balance is taken into consideration in consideration of weight and cost.

  Therefore, an aluminum alloy or a magnesium alloy is suitable as long as it is a metal, but it is needless to say that the metal may be formed of a resin having a desired thermal conductivity.

  Between the IC 5a to be radiated and the drawer 2, a heat conducting member 6 having good heat conductivity is interposed. As the heat conductive member 6, for example, heat conductive rubber is suitable because it is elastic and has good adhesion to the IC 5a as a heating element.

  With this configuration, the heat generated by the IC 5 a is efficiently transferred to the drawer 2 side via the heat conducting member 6.

  The heat transferred to the drawer 2 is naturally dissipated from the drawer surface, but heat convection is induced by the air flow velocity in the vicinity of the disk 1a rotating close to the drawer 2, and efficient heat dissipation is performed.

(Example)
Create a three-dimensional model with the structure according to an embodiment of the present invention,
(1) Heat source heat generation (2) Contact conditions (boundary conditions)
(3) Thermal conductivity of parts (4) The wind speed rising due to disk rotation is set as a parameter based on experimental values, and the temperature becomes steady by the action of heat conduction and heat radiation (heat dissipation) (temperature rise from normal temperature) I tried the analysis by computer software.

［表２］から明らかなように、ICで3℃、ドライブ雰囲気温度にて6℃、ピックアップで1℃下がっており、顕著な放熱効果が確認できる。 Table 2 shows a comparison between the structure according to the embodiment of the present invention and the structure in which the substrate is fixed to the outer casing and the IC heat is radiated as a conventional structure.

As can be seen from [Table 2], the IC is 3 ° C lower, the drive ambient temperature is 6 ° C lower, and the pickup is 1 ° C lower.

  FIG. 4 is a top view of the optical disc apparatus according to the embodiment of the present invention. The drawer 2 is slidable with respect to the bottom plate 3, and guide rails 7 that slidably support the drawer 2 are disposed on the left and right sides of the drawer 2 as shown in FIG. 4. The lock-side guide rail 7 and the drawer 2 for locking the drawer 2 to the bottom plate 3 are respectively formed with hooks, and an eject spring 8 is suspended between the guide rail-side hook 7a and the drawer-side hook 2a. Yes.

  Here, in the slim type optical disc apparatus for mounting on the notebook personal computer, a new mechanism is adopted for the ejection mechanism in order to suppress the weight increase and the cost increase due to the adoption of the heat dissipation structure, which will be described.

  FIG. 5 is a perspective view of the entire optical disc apparatus viewed from the front side, and FIG. 6 is a perspective view of the entire optical disc apparatus viewed from the back side.

  As shown in FIG. 5, a drawer 2 on which a disk drive mechanism M is mounted and a bottom plate 3 for protecting and shielding the bottom side of the drawer 2 are provided. The drawer 2 is slidable with respect to the bottom plate 3, and therefore guide rails 7, 7 that slidably support the drawer 2 are arranged on the left and right sides of the drawer 2.

  FIG. 7 is a perspective view showing details of the spring mounting portion, and FIG. 8 is a perspective view showing details of the side pressure acting portion. As shown in FIGS. 6 and 7, hooks are formed on the guide rail 7 on the lock side and the drawer 2 for locking the drawer 2 to the bottom plate 3, respectively, and between the guide rail side hook 7a and the drawer side hook 2a. An eject spring 8 is suspended on the side. The lock-side guide rail 7 is regulated by a stopper (not shown) provided above in FIG. 7, and the drawer 2 is regulated by a stopper (not shown) provided in FIG. ing. The lock-side guide rail 7 is regulated so as to protrude from the drawer 2 by a desired dimension.

  As shown in FIG. 8, a side pressure protrusion 9 for applying a side pressure is disposed at the end of the guide rail on the lock side. The side pressure protrusion 9 is made of, for example, a resin spring made of polyacetal resin in order to provide springiness or the like. A side pressure transmission projection 9 a for transmitting side pressure is formed at the end of the side pressure projection 9. A side pressure receiving portion 2 b that receives a side pressure is formed at the rear end portion of the drawer 2, and a biasing force receiving wall 3 b that receives a biasing force is formed at a corner of the back wall portion 3 a of the bottom plate 3. The side pressure receiving portion 2b is preferably formed integrally with the drawer 2, and the biasing force receiving wall 3b is preferably formed integrally with the bottom plate 3. Due to the mutual interference at the drawer insertion completion position, a side pressure is applied between the drawer 2 and the guide rail 7 using the eject biasing force. Such side pressure suppresses rattling between the drawer 2 and the guide rail 7.

  Next, the force generated when the drawer enters and exits the optical disc apparatus main body will be described with reference to the drawings.

  FIGS. 9A, 9B, and 9C are explanatory views showing the behavior of the eject spring 8 when the drawer enters.

  In the state shown in FIG. 9A, the eject spring 8 is in an initial biased state in which it is suspended, and the drawer 2 and the guide rail 7 on the lock side spring-biased on the drawer are integrated to form an apparatus main body. Enter the side.

  Next, in the state shown in FIG. 9B, the back end of the lock-side guide rail 7 abuts against the bottom plate back wall portion 3a and slides with respect to the drawer 2, and the eject spring 8 is in the process of extension.

  In the state shown in FIG. 9C, the drawer 2 is completely inserted into the optical disc apparatus main body, and the drawer 2 is locked and held. The restoring force due to the maximum extension of the eject spring 8 is stored as the drawer discharge force. This is released when the drawer 2 is unlocked, and the drawer 2 is ejected from the optical disc apparatus main body.

  Next, the side pressure generation of the drawer will be described. 10 (a) and 10 (b) are explanatory diagrams showing how the drawer side pressure is generated. FIG. 10A corresponds to FIG. 9B, and the eject spring 8 is not shown. As shown in FIG. 10A, the front end of the guide rail is restricted by the rail abutting portion 3c of the bottom plate back wall portion 3a, and the side pressure receiving portion 2b on the drawer side and the side pressure transmitting projection 9a on the guide rail side reach a nearby position. ing. Further, the urging force receiving wall 3b formed on the bottom plate side is also close but not acting.

  Further, at the position shown in FIG. 10B where the drawer 2 has entered the optical disk apparatus main body, the side pressure receiving portion 2b on the drawer side presses the side pressure transmitting projection 9a on the guide rail 7 side, and the side pressure protruding portion 9 is deformed to slide outward. Then, the guide rail 7 on the lock side is pushed forward by being guided by the urging force receiving wall 3b on the bottom plate side. In that case, it leaves | separates from the rail contact part 3c of the above-mentioned bottom-plate back wall part 3a, and all urging | biasing force will act on the urging | biasing force receiving wall 3b, According to the slope angle of the urging | biasing force receiving wall 3b, a side pressure direction and a drawer discharge direction As a result, the rattling and restraining force (side pressure) of the drawer 2 and the guide rail 7 is created.

  According to the above-described configuration, it is possible to save cost and space by reducing the number of parts and man-hours. Further, assembling can be improved at the time of manufacturing, so that errors in assembling can be reduced, and more reliable by reducing the number of parts. Can improve the performance. Further, the rattling prevention effect can be improved by the configuration in which the rail and the drawer can be energized at the same time. In particular, a vibration preventing effect at high speed can be obtained, and noise can be reduced.

  Next, another embodiment of the present invention will be described with reference to FIG. Concavities and convexities are formed on the surface of the drawer 2 which is a movable slide base on which the mechanism 1 is mounted. It is not restricted to an unevenness | corrugation, A recessed part may be sufficient. By adopting such a shape, the surface area of the drawer 2 is increased, so that the heat dissipation efficiency is increased like a large radiator.

  As described above, in this embodiment, the drawer is formed of a material having good thermal conductivity, and the IC as the heating element is closely attached to the inner wall of the drawer by the heat conductive member. The heat convection is induced by the wind velocity in the vicinity of the disk that is close to and opposed to the drawer, and the heat transmitted to the drawer side is efficiently dissipated in the air to suppress the rise in the drive internal temperature.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

It is a principal part disassembled perspective view of the optical disc device concerning the embodiment of the present invention. It is a principal part disassembled perspective view of the optical disc device concerning the embodiment of the present invention. It is principal part sectional drawing of the optical disk apparatus based on embodiment of this invention. 1 is a top view of an optical disc apparatus according to an embodiment of the present invention. It is the perspective view which looked at the whole optical disk device from the front side. It is the perspective view which looked at the whole optical disk device from the back side. It is a perspective view which shows the detail of the spring attaching part of an optical disk device. It is a perspective view which shows the detail of the side pressure action part of an optical disk apparatus. It is explanatory drawing which shows the behavior of the eject spring at the time of drawer entrance. It is explanatory drawing which shows the behavior of the eject spring at the time of drawer entrance. It is explanatory drawing which shows the behavior of the eject spring at the time of drawer entrance. It is explanatory drawing which shows the mode of generation | occurrence | production of drawer side pressure. It is explanatory drawing which shows the mode of generation | occurrence | production of drawer side pressure. It is a perspective view of the optical disc device concerning another embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Optical disk apparatus, 1 ... Traverse mechanical chassis, 1a ... Optical disk, 1b ... Disk motor, 2 ... Drawer, 2a ... Hook, 2b ... Side pressure receiving part, 3. ..Bottom plate, 3a ... back wall portion, 3b ... urging force receiving wall, 3c ... rail contact portion, 4 ... pickup head, 5 ... main PC plate, 5a ... IC , 6 ... heat conducting member, 7 ... guide rail, 7a ... hook, 8 ... eject spring, 9 ... side pressure projection, 9a ... side pressure transmission projection.

Claims (4)

A mechanical chassis equipped with a drive mechanism for supporting and rotating the information recording medium;
A substrate on which a semiconductor element is mounted;
The drawer is provided facing the information recording medium, the mechanical chassis is mounted, and a drawer formed using a material having good thermal conductivity at least in part.
An optical disc apparatus, wherein the semiconductor element is brought into contact with a portion of the drawer having a good thermal conductivity through a heat conductive member having a good thermal conductivity.   2. The optical disc apparatus according to claim 1, wherein the drawer has a thermal conductivity at 20 [deg.] C. of 50 W / m.k or more and a specific gravity of 3 or less.   3. The optical disk apparatus according to claim 2, wherein the drawer is made of an aluminum alloy or a magnesium alloy.   4. The optical disc apparatus according to claim 1, wherein unevenness or recesses are formed on a surface of the drawer.

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