Lamp and magnetic disc device

Abstract

To provide a lamp that can suppress the occurrence of cracking to improve reliability and a magnetic disc device including the same.SOLUTION: According to an embodiment, a lamp of a magnetic disc device includes: a lamp body and a support bracket integrally formed together with resin; and a metal reinforcement plate that is embedded in the lamp body oppositely to the support bracket. The reinforcement plate opposes a border part between the lamp body and the support bracket and also has an opening filled with resin.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] FIELD An embodiment of the present invention relates to a ramp and a magnetic disk drive. [Background technology]

[0002] A hard disk drive (HDD), for example, is a magnetic disk device that has a rotatable magnetic disk and a magnetic head that writes and reads data to and from the magnetic disk. The magnetic head is moved by a head actuator between a load position on the magnetic disk and an unload position outside the magnetic disk. HDDs also have a ramp that holds the magnetic head when it is moved to the unload position. The ramp is generally made of synthetic resin.

[0003] On the other hand, in recent years, as the capacity of magnetic disk drives has increased, the number of magnetic disks installed has tended to increase. As the number of magnetic disks increases, the ramps have also tended to become larger. When the ramps become larger, a metal reinforcing plate may be embedded in the ramp for reinforcement. Resin and metal have different linear expansion coefficients. When the ramp is subjected to temperature changes, a difference in expansion occurs between the resin ramp and the metal reinforcing plate, generating thermal stress. This can lead to cracks forming in the corners of the resin due to repeated temperature changes. If cracks occur, the ramp's dimensions may shift, interfering with the loading and unloading operations of the magnetic head. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] U.S. Patent No. 6,424,501 [Patent Document 2] Japanese Patent Application Laid-Open No. 2007-73168 [Patent Document 3] US Patent Application Publication No. 2010 / 0226231 Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the embodiments of the present invention is to provide a ramp that can suppress the occurrence of cracks and improve reliability, and a magnetic disk device that includes the ramp. [Means for solving the problem]

[0006] According to an embodiment, a ramp for a magnetic disk drive includes a ramp body and a support bracket integrally molded from resin, and a metal reinforcing plate embedded in the ramp body and facing the support bracket. The reinforcing plate faces the boundary between the ramp body and the support bracket and has an opening filled with resin. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is an exploded perspective view of a hard disk drive (HDD) according to a first embodiment, showing the top cover exploded. [Figure 2] FIG. 2 is a plan view of the HDD. [Figure 3] FIG. 3 is a side view schematically showing the magnetic head, suspension, and magnetic disk in the HDD. [Figure 4] FIG. 4 is a perspective view showing the front side of the lamp of the HDD. [Figure 5] FIG. 5 is a perspective view showing the rear side of the lamp. [Figure 6] FIG. 6 is a perspective view showing the rear side of the lamp and a reinforcing plate. [Figure 7] FIG. 7 is a perspective view of the reinforcing plate. [Figure 8] FIG. 8 is a perspective view showing a lamp installation portion and a lamp in a housing of the HDD. [Figure 9] FIG. 9 is an enlarged side view of a portion of the lamp. [Figure 10] FIG. 10 is a perspective view showing the rear side of the ramp and a reinforcing plate in the HDD according to the second embodiment. [Figure 11] FIG. 11 is a perspective view of the reinforcing plate in the HDD according to the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0008] A magnetic disk drive according to an embodiment will be described below with reference to the drawings. The disclosure is merely an example, and appropriate modifications that are easily conceivable by those skilled in the art while maintaining the gist of the invention are naturally included within the scope of the present invention. Furthermore, the drawings may be schematic in size, shape, etc., of each part compared to the actual embodiment for clarity of explanation, but these are merely examples and do not limit the interpretation of the present invention. Furthermore, in this specification and each drawing, elements similar to those previously described with reference to the previous drawings may be designated by the same reference numerals, and detailed descriptions may be omitted as appropriate.

[0009] (First embodiment) A hard disk drive (HDD) according to a first embodiment will be described in detail as a magnetic disk device. Fig. 1 is an exploded perspective view of the HDD according to the first embodiment with the cover disassembled, and Fig. 2 is a plan view of the HDD with the cover removed. As shown in FIG. 1, the HDD includes a substantially rectangular housing 10. The housing 10 has a rectangular box-shaped base 12 with an open top, and a cover (top cover) 14 that is fastened to the base 12 with a plurality of screws 13 and closes the top opening of the base 12. The base 12 has a rectangular bottom wall 12a that faces the cover 14 with a gap therebetween, and side walls 12b that extend along the periphery of the bottom wall 12a. The base 12 is integrally molded from, for example, an aluminum alloy. The side walls 12b include a pair of long side walls facing each other and a pair of short side walls facing each other. The cover 14 is formed into a rectangular plate shape from, for example, stainless steel. The periphery of the cover 14 is fastened to the top surfaces of the side walls 12b with the screws 13.

[0010] The housing 10 contains a plurality of magnetic disks 18 (e.g., nine) as disk-shaped recording media, and a spindle motor 19 that supports and rotates the magnetic disks 18. The spindle motor 19 is disposed on the bottom wall 12a. Each magnetic disk 18 is formed in a disk shape, e.g., 96 mm (3.5 inches) in diameter, and includes a substrate made of a non-magnetic material, e.g., glass or aluminum, and magnetic recording layers formed on the upper surface (first surface) and lower surface (second surface) of the substrate. The magnetic disks 18 are coaxially fitted to the hub of the spindle motor 19 and further clamped by a clamp spring 20. This supports the magnetic disks 18 in a state parallel to the bottom wall 12a of the base 12. The spindle motor 19 rotates the plurality of magnetic disks 18 in the direction of arrow B at a predetermined rotation speed. The number of magnetic disks 18 mounted is not limited to nine, and may be eight or fewer, or ten or more.

[0011] 1 and 2, housing 10 contains a plurality of magnetic heads 17 that record and reproduce information on magnetic disks 18, and an actuator assembly (sometimes referred to as a head stack assembly (HSA)) 22 that supports these magnetic heads 17 so that they can move freely relative to magnetic disks 18. Housing 10 also contains a voice coil motor (VCM) 24 that rotates and positions actuator assembly 22, a ramp load mechanism 25 that holds magnetic heads 17 in an unload position spaced apart from magnetic disks 18 when they move to the outermost periphery of magnetic disks 18, a board unit (FPC unit) 21 on which electronic components such as a conversion connector are mounted, and a spoiler 70. Actuator assembly 22 and VCM 24 constitute a head actuator. A printed circuit board 27 is screwed to the outer surface of the bottom wall 12a of the base 12. The printed circuit board 27 controls the operation of the spindle motor 19 and also constitutes a control unit that controls the operation of the VCM 24 and the magnetic head 17 via the board unit 21.

[0012] The actuator assembly 22 has an actuator block 29 supported rotatably around a support shaft 28, a plurality of arms 32 extending from the actuator block 29, and a suspension assembly 30 extending from each arm 32. The support shaft 28 is erected on the bottom wall 12a. A magnetic head 17 is supported at the tip of each suspension assembly 30.

[0013] The actuator assembly 22 has a support frame (not shown) that extends from the actuator block 29 in the opposite direction to the arm 32, and this support frame supports a voice coil 34. The voice coil 34 is located between a pair of yokes 37 fixed on the base 12, and together with these yokes 37 and a magnet fixed to one of the yokes, the VCM 24 is configured.

[0014] The FPC unit 21 has a base portion 21a fixed to the bottom wall 12a, a long, thin, strip-shaped relay portion 21b extending from the base portion 21a, and a joint portion 21c provided continuously with the tip of the relay portion 21b. The base portion 21a, the relay portion 21b, and the joint portion 21c are formed of a flexible printed circuit board (FPC). The joint portion 21c is attached to the actuator block 29.

[0015] FIG. 3 is a side view showing the magnetic head and the magnetic disk in a floating state. As shown in the figure, the magnetic disk 18 has a disk-shaped substrate 101 made of a non-magnetic material, such as glass. An underlayer 102, a magnetic recording layer 103, and a protective film 104 are sequentially laminated on each surface of the substrate 101. The magnetic disk 18 is rotated at a predetermined speed by a spindle motor 19. The suspension assembly 30 has a suspension 26, a wiring member (flexure) 40 attached to the suspension 26, and a tab 46 protruding from the tip of the suspension 26. The magnetic head 17 is supported by a gimbal portion 41 of the wiring member 40. The magnetic head 17 is electrically connected to the FPC unit 21 via the wiring member 40.

[0016] The magnetic head 17 is configured as a floating-type head and includes a slider 42 formed in a substantially rectangular parallelepiped shape and a head section 44 formed at the trailing end of the slider 42. The head section 44 includes a write head and a read head. The magnetic head 17 is maintained floating a predetermined distance above the surface of the magnetic disk 18 by airflow C generated between the disk surface and the slider 42 as the magnetic disk 18 rotates. The direction of the airflow C coincides with the rotation direction B of the magnetic disk 18.

[0017] 1 and 2, with the actuator assembly 22 installed in the base 12, the support shaft 28 stands upright and is approximately parallel to the spindle of the spindle motor 19. The actuator assembly 22 is rotatably supported around the support shaft 28 and can rotate between an unload position (position shown by a solid line in FIG. 2) where the magnetic head 17 is unloaded outside the outermost periphery of the magnetic disk 18 and an inner peripheral position (position shown by a two-dot chain line in FIG. 2) where the magnetic head 17 is located on the innermost periphery of the magnetic disk 18. Each magnetic disk 18 is positioned between two suspension assemblies 30. When the HDD is in operation, the magnetic head 17 supported by the two suspension assemblies 30 faces the upper and lower surfaces of the magnetic disk 18, respectively.

[0018] The ramp load mechanism 25 includes a ramp 80. The ramp 80 is fixed to the base 12 and is located near the periphery of the magnetic disk 18. When the HDD is not in operation, when the magnetic head 17 moves away from the outer periphery of the magnetic disk 18 and moves to a predetermined unload position, the tab 46 of the suspension assembly 30 rides onto the ramp 80. This keeps the magnetic head 17 at the unload position away from the magnetic disk 18.

[0019] Next, the ramp 80 of the ramp load mechanism 25 will be described. FIG. 4 is a perspective view showing the guide block side of the lamp, and FIG. 5 is a perspective view showing the rear side of the lamp. 4 and 5, the lamp 80 has a lamp body 82 formed in the shape of a rectangular plate, nine guide blocks 84 protruding from one surface of the lamp body 82, and a support bracket 86 protruding from the other surface of the lamp body 82, and is integrally molded from, for example, synthetic resin. In the figures, the height direction (first direction) of the lamp 80 is defined as the Y direction, the width direction (second direction) as the X direction, and the thickness direction as the Z direction.

[0020] The guide block 84 has an elongated rectangular parallelepiped shape and extends in the width direction X. The nine guide blocks 84 are lined up at predetermined intervals in the height direction Y, i.e., in the axial direction of the magnetic disk 18. A rectangular recess (notch) 87 is formed in one end of each guide block 84 on the magnetic disk 18 side. The recess 87 is formed across the lamp body 82.

[0021] Each guide block 84 has an upper guide surface (first guide surface) Ga that guides and supports the tab 46 of the suspension assembly 30, and a lower guide surface (second guide surface) Gb that guides and supports the tab 46 of the suspension assembly 30. The upper guide surface Ga and the lower guide surface Gb face each other and are provided approximately perpendicular to one surface of the lamp body 82. The upper guide surfaces Ga and lower guide surfaces Gb of the nine guide blocks 84 are arranged to match the height of the corresponding suspension assemblies 30. Each guide surface Ga, Gb extends approximately along the radial direction of the magnetic disk 18 to near the outer periphery of the magnetic disk 18, and is arranged on the movement path of the tab 46.

[0022] The support bracket 86 extends substantially perpendicularly from the other surface (rear surface) of the lamp body 82, i.e., in the thickness direction Z. The support bracket 86 is erected at approximately the center of the lamp body 82 in the height direction Y. The support bracket 86 has a constant thickness T1 in the height direction Y. The support bracket 86 extends in the width direction X from one end of the lamp body 82 in the width direction X to near the other end (the end on the magnetic disk 18 side). Since multiple recesses 87 are formed in the other end (one long side) of the lamp body 82, one end 86a of the support bracket 86 in the width direction X is spaced a predetermined distance from the other end of the lamp body 82. The one end 86a extends in the height direction Y by the thickness T1. The one end 86a may be referred to as a boundary or corner between the lamp body and the support bracket. In the extension direction (width direction X) of the support bracket 86, the thickness of the lamp 80 in the thickness direction Z changes abruptly at the position of the one end 86a.

[0023] A sleeve 88 is embedded in the support bracket 86. The sleeve 88 has a central axis extending in the height direction Y and opens on the upper and lower surfaces of the support bracket 86. Screws for fixing the lamp are inserted into the sleeve 88. A positioning pin 90 protrudes from the lower surface of the support bracket 86 (the surface facing the bottom wall of the base). The positioning pin 90 has a central axis extending in the height direction Y.

[0024] FIG. 6 is a perspective view of the rear side of the lamp, and FIG. 7 is a perspective view of the reinforcing plate. As shown by the dashed line in Fig. 6, a metal reinforcing plate 92 is embedded within the lamp body 82. The reinforcing plate 92 is formed in a rectangular shape slightly smaller than the lamp body 82, extends over almost the entire surface of the lamp body 82, and faces the support bracket 86. The reinforcing plate 92 has a pair of long sides 94a, 94b facing each other. The pair of long sides 94a, 94b extend in the height direction Y substantially parallel to the pair of long sides of the lamp body 82 and are further spaced slightly inward from the pair of long sides of the lamp body 82. 6 and 7, the reinforcing plate 92 has an opening (recess) 96 formed on one long side 94a. In this embodiment, the opening 96 is also open on the long side 94a. In one example, the opening 96 is formed in a rectangular shape. The opening 96 has a length t1 in the height direction Y and a width W1 in the width direction X.

[0025] When the reinforcing plate 92 is embedded in the lamp body 82, the opening 96 faces one end 86a of the support bracket 86. More specifically, the one end 86a is located within the area facing the opening 96. The opening 96 has an area larger than the one end 86a, but within a range that minimizes a decrease in the strength of the reinforcing plate 92. When the reinforcing plate 92 is embedded in the lamp body 82, the opening 96 is filled with resin, and forms part of the lamp body 82.

[0026] The distance between the one end 86a and the periphery of the opening 96 in a plan view (when the lamp body is viewed from the back of the lamp body 82 or from a direction perpendicular to the opening 96) is set as follows: In the height direction Y, the distance between the upper end of the one end 86a and the upper edge of the opening 96 is set as TU, the distance between the lower end of the one end 86a and the lower edge of the opening 96 is set as TL, and in the width direction X, the distance between the one end 86a and the right edge of the opening 96 is set as WR, and the distance between the one end 86a and the left edge of the opening 96 is set as WL. The distances TU, TL, WR, and WL are set to be greater than zero and smaller than an arbitrary upper limit value, for example, the thickness T1 of the support bracket 86. More preferably, the distances are set to satisfy, for example, T1 / 5 ≦ TU, TL, WR ≦ T1 / 2 and T1 / 5 ≦ WL ≦ T1×2 / 3. The standard for the intervals TU, TL, WR, and WL is not limited to the thickness T1 of the support bracket 86, and various standard values ​​can be selected. Alternatively, the intervals TU, TL, WR, and WL may be defined to fall within a numerical range, for example, a range of 0.5 to 3 mm.

[0027] In this embodiment, the lamp body 82 and the support bracket 86 are integrally molded from resin, and the reinforcing plate 92 is formed from a material other than resin, such as metal. Examples of resin that can be used include polyacetal resin, liquid crystal polymer, and polyetherimide. Examples of metal that can be used include stainless steel SUS304, stainless steel SUS430, and aluminum alloy. For example, polyacetal resin (linear expansion coefficient: 11 x 10 -5 (1 / K)) and SUS304 (linear expansion coefficient: 1.73 × 10 -5 In the case of a combination of resin and metal (1 / K), the linear expansion coefficients differ by six times or more. Resin deforms relatively more with temperature, while metal deforms relatively less with temperature. Therefore, stress is generated near the contact surface between the two materials due to the difference in the relative amounts of deformation. In the lamp 80 of this embodiment, assuming that the mechanism 95 is not present, the difference in the linear expansion coefficients is significant in the support bracket 86, which has a large amount of resin and a long contact distance with the reinforcing plate 92. This makes it easy for stress to be generated at one end (corner or boundary) 86a, which is one end (one end in the width direction X) of the support bracket 86. In particular, due to the geometric feature that the thickness of the lamp 80 in the thickness direction Z changes abruptly at the position of the one end 86a, stress is likely to be concentrated at the one end 86a. Therefore, according to this embodiment, an opening 96 is provided in the reinforcing plate 92 in an area facing the one end 86a of the support bracket 86, and this opening 96 is filled with resin. In other words, no metal plate is present in the area facing the one end 86a. This eliminates the difference in the amount of relative deformation at the one end 86a, and makes it possible to reduce the stress generated at the one end 86a.

[0028] FIG. 8 is a perspective view showing a lamp installation portion of the HDD housing and the lamp. As shown in Fig. 8, the base 12 of the housing 10 has an integral lamp mounting portion 50 for mounting a lamp 60. The lamp mounting portion 50 protrudes as a seat from the corner between the bottom wall 12a and the side wall 12b of the base 12. The lamp mounting portion 50 has a flat mounting surface 50a. The mounting surface 50a is located approximately midway in the height direction of the side wall 12b and extends approximately parallel to the bottom wall 12a.

[0029] The support bracket 86 of the ramp 80 described above is placed on the installation surface 50a and further fixed to the installation surface 50a by a fixing screw 52. The fixing screw 52 is threaded into the installation surface 50a through a sleeve 88 of the support bracket 86. The ramp body 82 is disposed in an upright position approximately perpendicular to the bottom wall 12a of the base 12. The guide block 84 is located near the peripheral edge of the corresponding magnetic disk 18. When the ramp 80 is installed on the ramp installation portion 50, the outer peripheries of the nine magnetic disks 18 are positioned in the recesses 87 of the corresponding guide blocks 84 with gaps therebetween.

[0030] 9 is an enlarged side view of the magnetic disk, magnetic head, and a portion of the ramp. As shown in the figure, when the HDD is not in operation, if the magnetic head 17 moves away from the outer periphery of the magnetic disk 18 toward the unload position, the tab 46 of the suspension assembly 30 rides up onto the upper guide surface Ga or the lower guide surface Gb of the ramp 80. The tab 46 then moves along the upper guide surface Ga or the lower guide surface Gb of the ramp 80 to the unload position and stops there. As a result, the magnetic head 17 is held by the ramp 80 at the unload position, away from the magnetic disk 18.

[0031] In the HDD according to the first embodiment configured as described above, the ramp 80 has an opening 96 formed in the reinforcing plate 92 in an area facing one end 86a of the support bracket 86, and this opening 96 is filled with resin. This eliminates the difference in the amount of relative deformation at one end 86a of the support bracket 86, and reduces the stress generated at the one end 86a. This makes it possible to suppress the occurrence of cracks in the ramp 80. As described above, according to the first embodiment, it is possible to provide a ramp that can suppress the occurrence of cracks and improve reliability, and a magnetic disk device that includes the ramp.

[0032] Next, a description will be given of a lamp of an HDD according to another embodiment. In the other embodiment described below, the same parts as those in the first embodiment described above are given the same reference numerals, and detailed descriptions thereof will be omitted or simplified, and the detailed description will focus on parts that differ from the first embodiment.

[0033] (Second embodiment) FIG. 10 is a perspective view of the rear side of the lamp of the HDD according to the second embodiment, and FIG. 11 is a perspective view of the reinforcing plate of the lamp. As shown in the figure, a metal reinforcing plate 92 is embedded in the lamp body 82 of the lamp 80. The reinforcing plate 92 is formed in a rectangular shape that is slightly smaller than the lamp body 82 and extends over almost the entire surface of the lamp body 82. A pair of long sides 94a, 94b of the reinforcing plate 92 extend substantially parallel to a pair of long sides of the lamp body 82 and are further spaced slightly inward from these pair of long sides. The reinforcing plate 92 has an opening (recess) 96 formed on one of the long sides 94a. In the second embodiment, the opening 96 is formed in a closed rectangular shape. That is, the opening 96 does not open to the long side 94a of the reinforcing plate 92. The long side of the opening 96 faces the long side 94a of the reinforcing plate 92 in parallel with and spaced apart from the long side. A strip-shaped metal plate extends between the long side of the opening 96 and the long side of the reinforcing plate 92.

[0034] When the reinforcing plate 92 is embedded in the lamp body 82, the opening 96 faces one end 86a of the support bracket 86. The one end 86a is located within the area facing the opening 96. Furthermore, when the reinforcing plate 92 is embedded in the lamp body 82, the opening 96 of the reinforcing plate 92 is filled with resin, and the reinforcing plate 92 forms part of the lamp body 82.

[0035] The size and dimensions of the opening 96 relative to the one end 86a are substantially the same as those of the lamp 80 according to the first embodiment described above. Specifically, the distances TU, TL, WR, and WL between the one end 86a and the periphery of the opening 96 are set to be greater than zero and smaller than the thickness T1 of the support bracket 86. More preferably, they are set to satisfy, for example, T1 / 5 ≦ TU, TL, WR ≦ T1 / 2 and T1 / 5 ≦ WL ≦ T1×2 / 3. The standard for the intervals TU, TL, WR, and WL is not limited to the thickness T1 of the support bracket 86, and various standard values ​​can be selected. Alternatively, the intervals TU, TL, WR, and WL may be defined to fall within a numerical range, for example, a range of 0.5 to 3 mm.

[0036] In the second embodiment, the other configurations of the lamp and HDD are the same as those of the lamp and HDD in the first embodiment. The second embodiment configured as described above can also achieve the same effects as the ramp and HDD of the first embodiment. That is, the second embodiment can provide a ramp that can suppress the occurrence of cracks and improve reliability, and a magnetic disk device including the ramp.

[0037] The present invention is not limited to the above-described embodiments, and the components can be modified and embodied in practice without departing from the spirit of the invention. Furthermore, various inventions can be formed by appropriately combining multiple components disclosed in the above embodiments. For example, some components may be omitted from all the components shown in the embodiments. Furthermore, components from different embodiments may be appropriately combined.

[0038] For example, in a magnetic disk device, the number of magnetic disks and the number of magnetic heads can be increased or decreased as needed, and various sizes of magnetic disks can be selected. The dimensions of the ramp body and the number of stages of the guide block can be adjusted according to the number of magnetic disks installed. Furthermore, the one end portion (corner or boundary portion) of the support bracket is not limited to one location, but may be present in multiple locations. In this case, multiple openings or notches are provided in the reinforcing plate so as to face the multiple one end portions (corner or boundary portions). [Explanation of symbols]

[0039] 10... housing, 12... base, 12a... bottom wall, 12b... side wall, 17... magnetic head, 18...magnetic disk, 22...actuator assembly, 25...ramp load mechanism, 30...Suspension assembly, 46...Tab, 80...Lamp, 82...Lamp body, 84... guide block, 86... support bracket, 86a... one end (corner, boundary), 92...reinforcing plate, 96...opening

Claims

1. A ramp for a magnetic disk drive, The lamp comprises a lamp body and a support bracket integrally molded from resin, and a metal reinforcing plate embedded in the lamp body and facing the support bracket, the reinforcing plate faces the boundary between the lamp body and the support bracket and has an opening filled with the resin. lamp.

2. 2. The lamp according to claim 1, wherein the reinforcing plate has a pair of opposing side edges, and the opening is open to one of the side edges.

3. 2. The lamp according to claim 1, wherein the reinforcing plate has a pair of opposing side edges, and the opening has a side edge that faces one of the side edges and is spaced apart from the other side edge.

4. The lamp according to claim 1 , wherein, in a plan view seen from a direction perpendicular to the opening, the distance between the periphery of the opening and the boundary portion is greater than zero and smaller than an arbitrary upper limit value.

5. the reinforcing plate has a pair of side edges that extend in a first direction and face each other, The support bracket extends along a second direction intersecting the first direction, The lamp according to claim 4 , wherein, in a plan view, a distance between the periphery of the opening and the boundary portion is greater than zero and smaller than a thickness of the support bracket in the first direction.

6. The lamp according to claim 5 , wherein the boundary portion extends in the first direction by a thickness of the support bracket.

7. a rotatable magnetic disk; an actuator that supports and drives a head so that the head can move relative to the magnetic disk; a ramp that holds the head in an unload position outside the magnetic disk, The lamp includes a lamp body and a support bracket integrally molded from resin, and a metal reinforcing plate embedded in the lamp body and facing the support bracket, the reinforcing plate faces the boundary between the lamp body and the support bracket and has an opening filled with the resin. Magnetic disk device.

8. 8. The magnetic disk drive according to claim 7, wherein the reinforcing plate has a pair of opposing sides, and the opening is formed in one of the sides.

9. 8. The magnetic disk drive according to claim 7, wherein the reinforcing plate has a pair of opposing side edges, and the opening has a side edge that faces one of the side edges and is spaced apart from the other side edge.

10. 8. The magnetic disk drive according to claim 7, wherein, in a plan view seen from a direction perpendicular to the opening, the distance between the periphery of the opening and the boundary portion is greater than zero and smaller than an arbitrary upper limit value.

11. the reinforcing plate has a pair of side edges that extend in a first direction and face each other, The support bracket extends along a second direction intersecting the first direction, 11. The magnetic disk drive according to claim 10, wherein, in a plan view, the distance between the periphery of the opening and the boundary portion is greater than zero and smaller than the thickness of the support bracket in the first direction.

12. The magnetic disk drive according to claim 11 , wherein the boundary portion extends in the first direction by a distance corresponding to the thickness of the support bracket.

Images