GB2279492A - Hermetically sealed disk drive - Google Patents
Hermetically sealed disk drive Download PDFInfo
- Publication number
- GB2279492A GB2279492A GB9412729A GB9412729A GB2279492A GB 2279492 A GB2279492 A GB 2279492A GB 9412729 A GB9412729 A GB 9412729A GB 9412729 A GB9412729 A GB 9412729A GB 2279492 A GB2279492 A GB 2279492A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cover
- base
- head
- information storage
- retrieval apparatus
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
- G11B33/12—Disposition of constructional parts in the apparatus, e.g. of power supply, of modules
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
- G11B33/14—Reducing influence of physical parameters, e.g. temperature change, moisture, dust
- G11B33/1446—Reducing contamination, e.g. by dust, debris
- G11B33/1466—Reducing contamination, e.g. by dust, debris sealing gaskets
Abstract
An information storage and retrieval apparatus includes a head-disk assembly including at least a recording medium 7 for storing information, a head 8 for storing and retrieving the information to and from the recording medium 7, a device 6 for moving the head 8 to a desired position on a surface of the recording medium 7 and positioning the head 8 to the desired position, a base 2 for retaining those members, and a cover 1 coming into intimate contact with the base 2 at a desired portion and sealing up the inside. Accordingly the base 2 and the cover 1 can be coupled to each other. even when an extremely thin adhesive or hermetic layer exists between the base 2 and the cover 1 at their coupling portion, they can be brought into close contact and bonded to each other.
Description
INFORMATION STORAGE AND RETRIEVAL APPARATUS
This invention relates to an information storage and retrieval apparatus as one of external storage devices of a computer system, more particularly, to an information storage and retrieval apparatus having a unique structure for a base and a cover for sealing up a head-disk assembly from external air.
Fig. 6 of the accompanying drawings is a top view of a magnetic disk apparatus as one of the information storage and retrieval apparatuses, and Fig.
7 is its sectional view.
A magnetic disk 7 is produced by forming a magnetic film on a non-magnetic substrate such as aluminum or glass, and records magnetically information on the surface thereof. To magnetically store and retrieve information, a magnetic head 8 is disposed on the surface of the magnetic disk 7. The magnetic head 8 is made of a material such as ferrite, a metal thin film, or the like.
While the magnetic disk 7 is at halt, the magnetic head 8 is in contact with a shipping area on the magnetic disk 7. When driven for rotation by a spindle motor 9, the magnetic head 8 floats on the surface of the magnetic disk 7 while keeping a gap of about 0.1 Am.
A carriage 6 is made of a material such as aluminum or magnesium. The carriage 6 precisely positions the magnetic head 8 in a radial direction of the magnetic disk 7.
The carriage 6 is driven and positioned by a voice coil motor 5 having a magnetic circuit formed by a permanent magnet and a coil 4 shaped by spirally winding an aluminum wire or a copper wire, through electromagnetic induction.
A non-rotary portion of the spindle motor 9, the shaft of the carriage 6 and the voice coil motor 5 are fixed to the base 2. To effect correct storage and retrieval of the information between the magnetic head 8 and the magnetic disk 7, dust must not be entered this space and must not be either disturbed a magnetic field. Therefore, the inside of the head-disk assembly must always be kept clean.
A contact tolerance between the magnetic head 8 and the magnetic disk 7 greatly affects service life of the magnetic disk apparatus. When this life runs out, various troubles occur, and part of the information stored in the magnetic disk 7 cannot be retrieved depending on the condition of the troubles.
When the troubles become worse, all the information stored in the magnetic disk 7 cannot be at all retrieved. When life of the magnetic disk apparatus runs out and the troubles occur, this problem exerts great adverse influences on the society.
The initial phenomenon of the trouble mainly results from collision of the magnetic head 8 against the magnetic disk 7. One of the causes is dust contained in external air that enters the inside of the head-disk assembly. When this dust wedges between the magnetic head 8 and the magnetic disk 7, float of the magnetic head 8 becomes unstable, so that collision takes place. When the magnetic head 8 impinges against the magnetic disk 7, broken pieces and dust generated from them due to collision further induces collision, so that the trouble becomes acceleratedly critical.
The related arts associated with the present invention include JP-A-4-132072, JP-A-3-171491 (corresponding U.S. Patent Application No. '89/434,653 was granted as U.S. Patent No. 5,021,905 on June 4, 1991), and JP-A-3-224191 (corresponding U.S. Patent
Application No. '91/647,561 was granted as U.S. Patent
No. 5,233,491 on August 3, 19930. The inventors of the present invention have acquired the following observations on these technologies.
As shown in Fig. 7, a method of sealing up the inside of the head-disk assembly from the external air couples the cover 1 and the base 2 each made of aluminum as a material by screws 14 through gaskets 10 made of a rubber, a resin, a sponge, etc. An inner filter (not shown) is -disposed inside the head-disk assembly, and dust is collected by the circulation of air generated by the revolution of the magnetic disk 7 inside the head-disk assembly.
When the cover 1 and the base 2 are coupled through the gaskets 10 and the head-disk assembly is sealed up, a pressure difference is likely to occur between the inside and the outside of the head-disk assembly due to the change of an external temperature.
In this case, external air is likely to enter from those portions at which sealability is relatively low, such as between the gaskets 10 and the cover 1 or the base 2. To prevent this problem, spileholes are formed in the cover 1 or the base 2 through an aspiratory outer filter 3 having small air resistance so as to prevent the external air from entering the head-disk assembly
The inventors of the present invention have found out another problem that the section of each gasket 10 and the spilehole allow the permeation of vapor contained in the external air into the head-disk assembly. The view of the present inventors on this problem is as follows.
The incursive humidity promotes corrosion and degradation of components used inside the head-disk assembly, and exerts adverse influences on service life of the magnetic disk apparatus. This problem is particularly critical in a fabricated magnetic disk apparatus provided with easily oxidizable materials for attaining a high memory capacity. When the magnetic disk apparatus includes sputtered magnetic disks mounted thereon, a desiccant (not shown) must be essentially on board inside the head-disk assembly in order to avoid corrosion of the surface of the magnetic disk 7.
The related technologies shown in Figs. 6 and 7 employ the structure wherein the head-disk assembly is sealed up by the gaskets 10. Characteristic properties (primarily, flexibility) of the rubber, the resin, the sponge, etc, as the materials of the gaskets 10 undergo degradation with the passage of time. As a result, there raises the problem that external air enters the inside of the head-disk assembly. Depending on the components thereof, the rubber is likely to diffuse detrimental gases in the head-disk assembly in some cases.
On the other hand, when the screws 14 are used as means for coupling the cover 1 to the base 2, the fastening work of these screws 14 must be carried out while anticipating suitable shrinkage of the gaskets 10 using the rubber, the resin, the sponge, etc, as the material in order to keep sealability of the head-disk assembly for an extended period. This work calls for a high level of skill.
Predetermined suitable shrinkage can be secured to a certain extent of shaping the peripheral portion of each screw hole to a predetermined height on the mutually coupling surfaces of the cover 1 or the base 2 (i.e. salient fabrication) so that this protubernace reaches the opposed surface, predetermined suitable shrinkage can be secured. However, degradation of the gaskets 10 is yet unavoidable.
Further, the humidity inside the head-disk assembly increases with the drop of the ambient temperature due to the changes of the ambient temperature at the stop of the magnetic disk apparatus and during its transportation.
A desiccant is incorporated in some types of magnetic disk apparatuses so as to absorb moisture flowing through the section of the gasket 10 and through the spileholes.
It is the section of the gasket 10 at which the humidity is most likely to flow into the inside of the head-disk assembly, followed then by the spilehole and others. Though capable of cutting off the dust from external air, the section of the gasket 10 involves the problem of sealing humidity. On the other hand, there is no longer the room for storing the desiccant in such an amount as to be capable of absorbing humidity flowing into the head-disk assembly, inside the head-disk assembly for which the reduction of the size has been further required. Therefore, reduction of the vapor flowing into the head-disk assembly in very important in order to reduce the gasket amount of the desiccant.
The reduction of the size as well as the production cost of the magnetic disk apparatus are expected to continue further in future, too. According to a production method which assembles inexpensive components by an automatic assembly machine, the cost of production becomes high, on the contrary, if any defects occurring during assembly are repaired.
It is an object of the present invention to provide an economically assembled information storage and retrieval apparatus which can seal up a head-disk assembly from external air for a long period, and is suitable for the reduction of a size while keeping high reliability.
An information storage and retrieval apparatus according to the present invention has a head-disk assembly including at least a recording medium for storing information, a head for storing and retrieving the information into and from the recording medium, an apparatus for moving and positioning the head to a desired position on a surface of the recording medium, a base for storing therein these members, and a cover brought into close contact with the base at a desired portion and sealing the inside.
Such a structure can be obtained by coupling the base and the cover by plasticity fabrication, for example. Even when an extremely thin adhesive or hermetic layer exists between the base and the cover at their close adhesion portion, both of them are closely adhered and exhibit the effect of the present invention.
The present invention provides, preferably and mainly physically, the base and the cover into close mutual contact at their peripheral portions. Accordingly, the information storage and retrieval apparatus of the present invention does not include those portions the characteristic properties of which successively change (or undergo degradation), such as the gasket made of the rubber, the resin, the sponge, or the like.
Accordingly, the inside of the head-disk assembly can be sealed up from external air for an extended period, reliability of the information storage and retrieval apparatus can be improved, and its productivity can be improved, as well.
A notebook type personal computer is easily portable, and a magnetic disk apparatus built in this computer is highly resistant to external impact.
The requirement for the reduction of the size of the magnetic disk apparatus has resulted in the reduction of the size of the magnetic head. Because a magnetic head having a smaller weight than the conventional magnetic heads has been accomplished, shock-proofness (impulse acceleration proofness) has also been improved. When the present invention is employed, gasket of the desiccant into the head-disk assembly is not necessary, and the size of the magnetic disk apparatus can be reduced.
In the drawings:
Fig. 1 is a plan view showing the inside of a magnetic disk apparatus according to an embodiment of the present invention;
Fig. 2 is a sectional view of the magnetic disk apparatus shown in Fig. 1 taken along a line II
II of Fig. 1;
Fig. 3 is a top view when the magnetic disk apparatus shown in Fig. 1 is viewed from above;
Fig. 4 is a top view when a cover of a magnetic disk apparatus according to another embodiment of the present invention is viewed from above;
Fig. 5 is a sectional view of the cover shown in Fig. 4 when taken along a line V - V of Fig.
4;
Fig. 6 is a top view of a conventional magnetic disk apparatus when viewed from above;
Fig. 7 is a sectional view of the magnetic disk apparatus shown in Fig. 6 when taken along a line
VII - VII of Fig. 6;
Fig. 8 is a sectional view showing a coupling portion between a cover 1 and a base 2 of a magnetic disk apparatus according to an embodiment of the present invention;
Fig. 9 is a perspective view showing an example where a magnetic disk apparatus is mounted to a disk array;
Fig. 10 is a perspective view showing an example where a magnetic disk apparatus is mounted to a notebook type personal computer;
Figs. 11A and 11B are perspective view showing an example where a magnetic disk apparatus (Fig. 11B) is mounted to a large scale computer (Fig.
ill); and
Fig. 12 is an explanatory view useful for explaining the correlation between a gasket amount of a desiccant, a capacity of a magnetic disk apparatus and causes of humidity.
Fig. 1 is a plan view of the internal structure of a magnetic disk apparatus 17 according to an embodiment of the present invention, and Fig. 2 is its sectional view.
A plurality of magnetic disks 7 are disposed with predetermined gaps between them while interposing disk spacers (not shown), respectively, and are driven for rotation by a spindle motor 9. A magnetic head 8 is disposed for each face of the magnetic disk 7. Each magnetic head 8 is precisely positioned by a carriage 6 on the surface of the magnetic disk 7 and in a radial direction. The gaps between the magnetic heads 8 are kept at a constant gap by accurately finishing a magnetic head 8 fitting surface of the carriage 6. The carriage 6 is driven and positioned by a voice coil motor 5 and a coil 4 through electromagnetic induction.
Signal lines (not shown) from the magnetic heads 8 are fixed to the carriage 6 at several positions, and are connected to a read/write flexible printed circuit board 13 (hereinafter referred to as the "read/write FPC 13"). The read/write FPC 13 is connected to a read/write circuit board 11 for controlling read/write signals of the magnetic heads 8.
A motor flexible printed circuit board 12 (hereinafter referred to as the "motor FPC 12") for supplying power for driving the spindle motor 9 is connected to a sealed connector (not shown) capable of sealing up air and fixed to the base 2. A flexible printed circuit board (not shown), which is connected to the lower part of the read/write circuit board 11 and transmits the signal of this board 11, is connected to the sealed connector in alignment with the motor FPC 12. The sealed connector exposed outside a head-disk assembly is connected to a main board for controlling the headdisk assembly.
The interior of the head-disk assembly is kept always clean. Therefore, an inner filter 15 is disposed so as to collect dust by circulating air inside the head-disk assembly generated by the revolution of the magnetic disk 7. Incidentally, this magnetic disk apparatus does not use the outer filter 3 shown in Fig. 7.
A cover 1 and a base 2 (Fig. 2) use steel or aluminum as a material suitable for plasticity fabrication. A plating may be applied, whenever necessary, when a steel sheet is used.
The base 2 must retain precisely those components which constitute the head-disk assembly.
Therefore, the surface of the base 2 for retaining these components has rigidity to such a level that it does not undergo deformation during assembly and handling.
The portion of the base 2 at which it is coupled with the cover 1 is preferably and relatively thin so that plasticity fabrication can be executed between the cover 1 and the base 2 as shown in Fig. 8, and sealability after coupling can be improved, too.
Though the component mounting surface (bottom surface) of the base 2 is shown thicker than other surfaces as depicted in Fig. 2, a machining factor can be improved when the thickness is uniform, provided that the problem described above does not occur.
The base 2 is produced by drawing and molding one sheet material, and boring a hole for fitting the sealed connector by press punching. When the bottom surface is used as the component mounting surface, a diaphragm portion 24 shown in Fig. 2 is disposed throughout the entire periphery of the side surfaces as a pressure regulation mechanism lest accuracy of the component gaps on the base 2 is adversely affected at the time of coupling of the base 2 to the cover 1, or by a temperature difference of the head-disk assembly with the external temperature or by expansion/contraction of air inside the head-disk assembly. This pressure regulation mechanism may be disposed on the cover 1, or on both of the cover 1 and the base 2.
The thickness (rigidity) of the cover 1 is smaller (structurally weaker) than that of the base 2 lest accuracy of the component gaps mounted in the head-disk assembly is adversely affected when the cover 1 is coupled with the base 2. Further, the cover 1 has to such an extent a tensile strength that it does not undergo deformation and breakage upon coupling with the base 2 so as to prevent any adverse influences on the operations of the components mounted in the head-disk assembly.
As one of the means for improving rigidity when a thin sheet material suitable for plasticity fabrication is used as the material of the cover 1, there is means which conducts drawing by disposing a lynchet. Fig. 4 is a top view of an example of such a cover 1, and Fig. 5 is its sectional view. Another lining may be fitted to the cover 1.
After machining described above is completed, the cover 1 and the base 2 receive stress strain at the time of plasticity fabrication (press machining). Therefore, suitable heat-treatment is preferably carried out for the cover 1 and the base 2 to remove such stress stain.
The sealed connector is fitted to the base 2 so produced, and the components constituting the headdisk assembly are mounted into the base 2. The cover 1 and the base 2 are bent and coupled as shown in Fig. 8.
A hermetic or an adhesive may be packed into the bent portion as a method of further improving sealablility of the coupling portion between the cover 1 and the base 2. Incidentally, it has been confirmed that no air leak occurs in the coupling portion of the cover 1 and the base 2 of this embodiment even when an air pressure of 9.8 x 104 Pa is applied and then the coupled assembly is immersed in water.
A stress strain occurs in the cover 1 and the base 2 after their coupling. Consequently, suitable heat-treatment is carried out to remove this stress strain. Fig. 3 is a top view of the cover 1.
As shown in this drawing, the shape of the coupling portion is as simple as possible and the corners preferably have a radius R as great as possible to form round portions, respectively.
When each round portion has a radius of at least 1 mm, for example, coupling can be attained by an automatic assembly machine. In this embodiment, the round portions have a radius of 6 mm. The coupling speed of the cover 1 is retarded or the automatic assembly machine is slowly operated during coupling of the cover 1 and the base 2 if an impact which causes the magnetic head 8 to damage the magnetic disk 7 is applied. In other words, caution must be paid to the impact at the time of coupling.
As illustrated in Fig. 9, a plurality of magnetic disk apparatuses 17 can be incorporated into one casing 16 (hereinafter referred to as a "disk array 16") as external storages of a computer system. The magnetic disk apparatus 17 can be incorporated, too, inside a notebook type personal computer 18 having a built-in battery, as shown in Fig. 10. Further, as shown in Figs. 11A and lIB, a circuit board 19 having a plurality of magnetic disk apparatuses 17 according to the present invention, shown in Fig. llB, can be mounted into a large scale computer 20 shown in Fig.
11A. Incidentally, a reference numeral 21 in Fig. 9 denotes a fan, 22 is a power supply cable, and 23 is an interface cable.
The structure which incorporates the magnetic disk apparatus or apparatuses 17 inside the casing such as the disk array 16 and the large scale computer 20 provide with the fan 21 shown in Fig. 9 as cooling means for preventing the temperature rise inside the casing. Besides the cooling operation, the fan 21 sucks air from outside the casing and simultaneously takes in the dust and moisture (vapor) contained in air. Accordingly, the present invention can be applied lest the magnetic disk apparatus 17 undergoes troubles described above.
When the shapes of the cover 1 and the base 2 are symmetric with each other with respect to any of straight lines connecting the mid point of each side, they can be produced easily. When the connection face of the cover 1 and the base 2 has the same flat face, their coupling can be made easily.
In the head-disk assembly according to this embodiment, the cover 1 and the base 2 each using steel or aluminum not permitting the passage of humidity as the material are brought into mutual close contact so as to seal up the inside from the atmosphere. In other words, because the gasket 10 and the outer filter 3 do not exist, the inflow of vapor and humidity from outside the head-disk assembly as the major factor of humidity does not occur.
The amount of a desiccant is determined in accordance with the capacity of the head-disk assembly, the diameter and cross-sectional area of the spilehole, permeability of other materials sealing up the external air, the temperature decrease, the estimated number of times of the stop of the operation of the apparatus, the kind of the desiccant, etc.
Accordingly, the factor for the humidity inside the head-disk assembly after the application of the present invention is only the rise of humidity of internal air of the head-disk assembly due to the drop of the ambient temperature of the apparatus.
This embodiment can drastically reduce the amount of the desiccant as shown in Fig. 12, and can reduce the size of the magnetic disk apparatus in future, too.
Though the embodiment given above deals with the magnetic disk apparatus, the present invention can be similarly applied to information storage and retrieval apparatuses such as an optical disk, an optomagnetic disk, and so forth.
The present invention can cut off the inside of the head-disk assembly from the external air for a long time. Further, the present invention can provide an information storage and retrieval apparatus having high productivity and high reliability by reducing the number of necessary components.
The problem of work management when fastening is made by using screws 14 and gasket 10 (Fig. 7) can be eliminated.
Because the screws do not exist, the thickness for the height of the screw head and the screw holes becomes unnecessary, and the thickness of the information storage and retrieval apparatus can be reduced.
Because the gasket 10 is not used, the aspiratory outer filter 3 and the spilehole become unnecessary. Because the amount of the desiccant can be reduced, the information storage and retrieval apparatus can be made compact.
Having described a preferred embodiment of the invention with reference to the accompanying drawings, it is to be understood that the invention is not limited to the embodiment and that various changes and modifications could be effected therein by one skilled in the art without deparating from the spirit or scope of the invention
Claims (13)
- CLAIMS: 1. An information storage and retrieval apparatus comprising: a recording medium for storing information; a head for storing the information into said recording medium and for retrieving the information from said recording medium; means for moving said head to a desired position on a surface of said recording medium and positioning said head to said desired position; a base for retaining thereinside said members; and a cover coupled to said base by plasticity fabrication.
- 2. An information storage and retrieval apparatus according to claim 1, wherein said cover seals up a space defined between said base and said cover.
- 3. An information storage and retrieval apparatus according to claim 2, wherein an adhesive or a hermetic is interposed between said cover and said base.
- 4. An information storage and retrieval apparatus according to claim 1, wherein at least one of said cover and said base has a diaphragm portion.
- 5. An information storage and retrieval apparatus according to claim 2, which further comprises a filter for collecting dust inside said sealed space.
- 6. An information storage and retrieval apparatus according to claim 2, wherein further includes a desiccant for absorbing moisture inside said sealed space.
- 7. An information storage and retrieval apparatus according to claim 1, wherein mechanical strength of said cover is lower than mechanical strength of said base.
- 8. An information storage and retrieval apparatus according to claim 1, wherein said cover itself includes a lynchet for reinforcing mechanical strength thereof.
- 9. An information storage and retrieval apparatus according to claim 1, wherein said cover includes a lining for reinforcing mechanical strength thereof.
- 10. An information storage and retrieval apparatus according to claim 1, wherein said cover and said base have at least one round portion.
- 11. An information storage and retrieval apparatus according to claim 1, wherein connection faces by said plasticity fabrication exist on the same plane.
- 12. An information storage and retrieval apparatus according to claim 1, wherein planes encompassed by said connection faces of said cover and said base are line-symmetric.
- 13. An information storage and retrieval apparatus substantially as herein described with reference to and as illustrated in Figs. 1 to 5 and 8 to 12 of the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5160779A JPH0721761A (en) | 1993-06-30 | 1993-06-30 | Information recording and reproducing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9412729D0 GB9412729D0 (en) | 1994-08-17 |
| GB2279492A true GB2279492A (en) | 1995-01-04 |
Family
ID=15722273
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9412729A Withdrawn GB2279492A (en) | 1993-06-30 | 1994-06-24 | Hermetically sealed disk drive |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH0721761A (en) |
| KR (1) | KR950001742A (en) |
| GB (1) | GB2279492A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5875158A (en) | 1995-01-25 | 1999-02-23 | Discovision Associates | Servo control system for information storage device |
| US5974007A (en) | 1995-01-25 | 1999-10-26 | Discovision Associates | Apparatus for moving a carriage assembly from an initial position to a target position |
| US6069857A (en) | 1991-02-15 | 2000-05-30 | Discovision Associates | Optical disc system having improved circuitry for performing blank sector check on readable disc |
| US6141300A (en) | 1989-06-20 | 2000-10-31 | Discovision Associates | Optical actuator including lens assembly with optical axis having symmetric suspensory forces acting thereon and optical disc system including same |
| US6236625B1 (en) | 1991-02-15 | 2001-05-22 | Discovision Associates | Optical disc system having current monitoring circuit with controller for laser driver and method for operating same |
| US6434087B1 (en) | 1995-01-25 | 2002-08-13 | Discovision Associates | Optical disc system and method for controlling bias coil and light source to process information on a storage medium |
| US8335050B2 (en) | 2007-04-03 | 2012-12-18 | Hitachi Global Storage Technologies, Netherlands B.V. | Disk drive with a solder preform hermetic seal |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20060001584A (en) | 2004-06-30 | 2006-01-06 | 삼성전기주식회사 | Optical media storage for reducing of the current consumption |
| KR101477331B1 (en) * | 2011-08-05 | 2014-12-30 | 삼성전기주식회사 | Base for motor and hard disk drive including the same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0054665A1 (en) * | 1980-12-24 | 1982-06-30 | International Business Machines Corporation | Sealed magnetic disk data storage file |
| EP0095558A2 (en) * | 1982-05-28 | 1983-12-07 | International Business Machines Corporation | Disk file apparatus |
-
1993
- 1993-06-30 JP JP5160779A patent/JPH0721761A/en active Pending
-
1994
- 1994-06-24 GB GB9412729A patent/GB2279492A/en not_active Withdrawn
- 1994-06-29 KR KR1019940015127A patent/KR950001742A/en not_active Application Discontinuation
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0054665A1 (en) * | 1980-12-24 | 1982-06-30 | International Business Machines Corporation | Sealed magnetic disk data storage file |
| EP0095558A2 (en) * | 1982-05-28 | 1983-12-07 | International Business Machines Corporation | Disk file apparatus |
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6141300A (en) | 1989-06-20 | 2000-10-31 | Discovision Associates | Optical actuator including lens assembly with optical axis having symmetric suspensory forces acting thereon and optical disc system including same |
| US6069857A (en) | 1991-02-15 | 2000-05-30 | Discovision Associates | Optical disc system having improved circuitry for performing blank sector check on readable disc |
| US6236625B1 (en) | 1991-02-15 | 2001-05-22 | Discovision Associates | Optical disc system having current monitoring circuit with controller for laser driver and method for operating same |
| US6058081A (en) | 1995-01-25 | 2000-05-02 | Discovision Associates | Optical drive system having servomotor operated relative to maximum quad sum signal |
| US6266306B1 (en) | 1995-01-25 | 2001-07-24 | Discovision Associates | Analog to digital converter and assembly for use in optical drive system to normalize servo error signals and multiplex reference voltage inputs and digital outputs |
| US6034364A (en) | 1995-01-25 | 2000-03-07 | Discovision Associates | Optical disc system including focus capture assembly with focus error signal circuit and method for operating same |
| US6087644A (en) | 1995-01-25 | 2000-07-11 | Discovision Associates | Focus capture for optical disc system including detection of quad sum signal to close focus |
| US5974007A (en) | 1995-01-25 | 1999-10-26 | Discovision Associates | Apparatus for moving a carriage assembly from an initial position to a target position |
| US5878015A (en) | 1995-01-25 | 1999-03-02 | Discovision Associates | Laser driver for controlling electrical current passed to a laser in an optical disc system |
| US6243336B1 (en) | 1995-01-25 | 2001-06-05 | Discovision Associates | Optical disc system having servo motor and servo error detection assembly operated relative to monitored quad sum signal and focus capture method for use in same |
| US5875158A (en) | 1995-01-25 | 1999-02-23 | Discovision Associates | Servo control system for information storage device |
| US6278665B1 (en) | 1995-01-25 | 2001-08-21 | Discovision Associates | Optical disc system including current monitoring circuit assembly having controller with improved optics module and laser driver and method for operating same |
| US6317391B1 (en) | 1995-01-25 | 2001-11-13 | Discovision Associates | Optical disc system having current monitoring circuit with improved bias coil assembly and controller for laser driver and method for operating same |
| US6418097B1 (en) | 1995-01-25 | 2002-07-09 | Discovision Associates | Analog to digital converter assembly for normalizing servo error signals and multiplexing reference voltage inputs and digital outputs and improved optical drive system including same |
| US6434087B1 (en) | 1995-01-25 | 2002-08-13 | Discovision Associates | Optical disc system and method for controlling bias coil and light source to process information on a storage medium |
| US6741529B1 (en) | 1995-01-25 | 2004-05-25 | Discovision Associates | Method and apparatus for moving carriage assembly from initial position to target position and optical disc system including same |
| US8335050B2 (en) | 2007-04-03 | 2012-12-18 | Hitachi Global Storage Technologies, Netherlands B.V. | Disk drive with a solder preform hermetic seal |
| US9412420B2 (en) | 2007-04-03 | 2016-08-09 | HGST Netherlands B.V. | Hermetically sealing a disk drive assembly |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0721761A (en) | 1995-01-24 |
| GB9412729D0 (en) | 1994-08-17 |
| KR950001742A (en) | 1995-01-03 |
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