GB2245752A - Magnetic disk apparatus - Google Patents

Magnetic disk apparatus Download PDF

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Publication number
GB2245752A
GB2245752A GB9112409A GB9112409A GB2245752A GB 2245752 A GB2245752 A GB 2245752A GB 9112409 A GB9112409 A GB 9112409A GB 9112409 A GB9112409 A GB 9112409A GB 2245752 A GB2245752 A GB 2245752A
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GB
Grant status
Application
Patent type
Prior art keywords
magnetic disk
case
apparatus
means
magnetic
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Withdrawn
Application number
GB9112409A
Other versions
GB9112409D0 (en )
Inventor
Katsuhiro Okutani
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date

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Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B25/00Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus
    • G11B25/04Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus using flat record carriers, e.g. disc, card
    • G11B25/043Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus using flat record carriers, e.g. disc, card using rotating discs
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B33/00Constructional parts, details or accessories not provided for in the preceding groups
    • G11B33/14Reducing influence of physical parameters, e.g. temperature change, moisture, dust
    • G11B33/1446Reducing contamination, e.g. by dust, debris
    • G11B33/1453Reducing contamination, e.g. by dust, debris by moisture

Abstract

A magnetic disk apparatus wherein magnetic disks and magnetic heads are housed in a case (1), prevents waterdrops from being generated on the surface of the magnetic disk (3) and avoids the magnetic head being attracted to the magnetic disk during the nonoperating period of the apparatus in one embodiment by installing in a case a fan (6) for circulating the air in the case during the suspension period of the apparatus, thereby making the temperature difference smaller between the air and the surface of the magnetic disk. In an alternative embodiment a magnetic disk apparatus wherein magnetic disks and magnetic heads are housed in a case, avoids the magnetic head being attracted to the magnetic disk even in the case where waterdrops are generated on the surface of the magnetic disk by rotating the magnetic disks during the nonoperating period of the apparatus to make the magnetic head lift off from the magnetic disk. <IMAGE>

Description

0 t MAGNETIC DISK APPARATUS This invention relates to a magnetic disk

apparatus wherein magnetic disks which rotate and magnetic heads are housed in a case, and the magnetic head for writing/reading information to/from the magnetic disk, which is lifted off from the magnetic disk due to the rotation of the magnetic disk.

Fig. I is a sectional view showing the construction of a conventional magnetic disk disclosed in Japanese Patent Utility Model Application LaidOpen No. 63-13492. In the figure, reference numeral I designates a case consisting of a base la and a cover 1b, a spindle motor 2 being installed on a base Ia. In the case 1, three magnetic disks 3 are supported by the spindle motor 2 at suitable intervals and in parallel with each other, and are rotated by the spindle motor 2. Between each two of the three magnetic disks 3, there are disposed magnetic heads 4 which write/read information facing the respective surfaces of the magnetic disks 3. Each magnetic head 4 is supported by an actuator 5 through arms, the actuator 5 moving the magnetic heads 4 in I 0 the radial direction of the magnetic disk 3.

In the conventional magnetic disk apparatus having the above-mentioned construction, the magnetic disk 3 is rotated at a constant speed of about 360Orpm due to the rotation of the spindle motor 2. On the other hand, the actuator 5 is driven by a voice coil motor (not shown), and the magnetic heads 4 supported by the actuator 5 are moved in the radial direction of the magnetic disk 3 facing the respective surfaces of the magnetic disks 3, and are located at prede termined positions to write/read information.

In such a magnetic disk apparatus, the magnetic head 4 is generally pushed against the magnetic disk 3 at about 10 tram-weight by a spring during the nonoperating period of the apparatus. When the power is supplied to rotate the spindle motor 2, the magnetic head 4 is forced to lift off from the surface of the magnetic disk 3 by about several tenths micron. The information is properly written/read in the state that the magnetic head 4 is slightly lifted off from the magnetic disk 3 as above. When the power supply is turned off to stop the rotation of the magnetic disk 3, the magnetic head 4 loses force of floating and contacts. the surface of the magnetic disk 3 again due to the pushing force of the spring.

In the magnetic disk apparatus having the above- 3 mentioned construction, in the case where temperature lowers at night, for example, waterdrops are generated on the sur- 1 face of the magnetic disk 3 because the temperature of the metallic magnetic disk 3 lowers faster than that inside the case 1. Accordingly, during the nonoperating period of the apparatus, the magnetic head 4 which,contacts the magnetic disk 3 can stick more tightly than usual due to the waterdrops which have been generated on the surface of the magnetic disk 3. There have been problems that the apparatus goes out of order or information cannot be correctly read from the magnetic disk 3 because the rotation of the spindle motor 2 is interrupted when the magnetic head 4 is stuck to the magnetic disk 3.

The present invention has been devised in order to solve the problems abovementioned.

A first object of the invention is to provide a magnetic disk apparatus which prevents the generation of waterdrops on the surface of the magnetic disk thereby inhibiting the magnetic head being attracted to the magnetic disk by rotating a fan during the nonoperating period of the apparatus to circulate the air in the case, thereby not producing a large temperature difference between the air in the 4- case and the surface of the magnetic disk.

The housing for the magnetic disks may be hermitically sealed thus the circulation of air is of the enclosed atmosphere in the housing.

A second object of the invention is to provide a magnetic disk apparatus which avoids the magnetic head being attracted to the magnetic disk even when the waterdrops are generated on the surface of the magnetic disk, by rotating the magnetic disk during the nonoperating period to lift off the magnetic head.

The invention will be further described by way of nonlimitative example with reference to the accompanying drawings in which:- Fig. 1 is a sectional -view showing the construction of a conventional magnetic disk apparatus; Fig. 2 is a sections view showing the construction of an embodiment of the magnetic disk apparatus of the invention; Fig. 3 is a sectional view showing the construction of another embodiment of the magnetic disk apparatus of the invention; Fig. 4 is a sectional view showing the construction of further embodiment of the magnetic disk apparatus of the invention; and Fig. 5 is a sectional view showing the construction of yet further embodiment of the magnetic disk apparatus of' the invention.

In the following, explanation will be made on the present invention referring to the drawings showing embodiments thereof.

Fig. 2 is a sectional view showing the construction of an embodiment of the magnetic disk apparatus of the invention. In the figure, reference numeral 1 designates a case consisting of a base la and a cover 1b, a spindle motor 2 being installed on the base Ia.

In the case 1, three magnetic disks 3 are supported by the spindle motor 2 at suitable intervals and in parallel with each other, and are rotated by the spindle motor 2. Between each two of the three magnetic disks 3, there are disposed magnetic heads 4 which writes/reads information facing the respective surfaces of the magnetic disks 3. Each magnetic head 4 is supported by an actuator 5 through arms, the actuator 5 moving the magnetic heads 4 in the radial direction of the magnetic disk 3.

Moreover, in the case 1, a fan 6 is disposed at the side of a magnetic disk 3. The fan 6 is connected to a fan battery 7 installed at the base la. A control means 9 makes the fan 6 rotate for a predetermined time during the nonoperating period of the apparatus, for example, every five G hours or in the case where the temperature becomes not higher than 0 C.

In the magnetic disk apparatus having the abovementioned construction, when the fan 6 rotates during nonoperating period of the operation, the air is sent through between the magnetic disks 3 into the case 1 as shown by arrows in the figure, thereby the air in the case 1 is circulated. Accordingly, there is no large temperature difference between the surface of the magnetic disk 3 and the air in the case 1, thereby waterdrops are not generated on the surface of the magnetic disk 3, avoiding the magnetic head 4 being attracted to the magnetic disk 3. In addition, the operation for writing/reading information is same as the conventional apparatus.

Fig. 3 is a sectional view showing the construction of another embodiment of the magnetic disk apparatus of the invention. The parts same as the aforementioned embodiment are denoted by the same numerals, and the explanation thereof is omitted.

On the base la, a battery 8 which is electrically connected to the spindle motor 2 is installed. A control means 10 makes the spindle motor 2 rotate for a predetermined time in the same way as the aforementioned embodiment every constant number of hours or in the case where the temperature becomes lower than a predetermined value during the nonoper- i 7 ating period of the apparatus.

In the magnetic disk apparatus having the abovementioned construction, when the spindle motor 2 rotates during the nonoperating period of the apparatus, the magnetic disk 3 is rotated to make the magnetic head 4 lift off from the magnetic disk 3. Accordingly, as the magnetic head 4 is not sticked to the magnetic disk 3 for a long time, the magnetic head 4 is more directly prohibited from sticking to the magnetic disk 3. In addition, operation for writing/ reading information is same as that of the conventional apparatus.

In these embodiments, a primary battery may be used for the fan battery 7 or the battery 8, however, by using battery charger which is automatically charged during the operation period of the apparatus or the period of power supply, when the charged energy is used for the operations of the fan 6 or the spindle motor 2, energy is to be effectively utilized.

In addition, though one fan 6 is used in the former embodiment, a plurality of fans may be used if necessary. Moreover, the power source of the fan 6 is not limited to the fan battery 7, but external power source may be used.

And, in both embodiments, explanation is given on the case where the operating conditions for the fan 6 or the spindle motor 2 during the suspension period of the appara- 19 tus is determined by time or temperature, however, the conditions are not limited thereto. For example, the fan or the spindle motor may be automatically operated in the case where humidity in the case 1 is more than a predetermined value or according to the detected result of both the temperature and humidity.

Moreover, as shown in Fig. 4 and Fig. 5, the apparatus may have such construction that manual switches 11, 12 are respectively set on the fan 6 and the spindle motor 2, and the fan 6 and the spindle motor 2 are operated manually.

As this invention may be embodied in several forms without departing from the spirit of essential characteristics thereof, the present embodiment is therefore illustrative and not restrictive, since the scope of the invention is defined by the appended claims rather than by the description preceding them, and all changes that fall within the metes and bounds of the claims, or equivalence of such metes and bounds thereof are therefore intended to be embraced by the claims.

19

Claims (15)

C L A I M S
1. A magnetic disk apparatus wherein a magnetic disk is housed in a case, comprising: a magnetic head which is so arranged as to be in contact with the surface of said magnetic disk and is lifted off from said magnetic disk by the rotation of said magnetic disk; a fan which circulates the air in said case, and control means for rotating said fan in the case where predetermined conditions are satisfied.
2. A magnetic disk apparatus as set forth in Claim 1, further comprising: means for measuring time during the nonoperating period of said apparatus, wherein said control means rotates said fan until a predetermined time has elapsed.
3. A magnetic disk apparatus as set forth in Claim 1, further comprising: means for measuring time during the nonoperating period of the apparatus wherein said control means rotates said fan for a predetermined time after another predetermined time has elapsed.
D
4. A magnetic disk apparatus as set forth in Claim 1, 2 or 3 further comprising: means for detecting the temperature in said case, wherein said control means rotates said fan in the case where the detected result by said means is lower than a predetermined temperature.
5. A magnetic disk apparatus as set forth in Claim 1, 2, 3 or 4 further comprising: means for detecting the temperature around the apparatus, wherein said control means rotates said fan in the case where the detected result by said means is lower than a predetermined temperature.
6. A magnetic disk apparatus as set forth in Claim 1, 2, 3, 4 or 5 further comprising: means for detecting the humidity in said case, wherein said control means rotates said fan in the case where the detected result by said means is higher than a predetermined humidity.
7. A magnetic disk apparatus wherein a magnetic disk is housed in a case,-comprising:
a magnetic head which is so arranged as to be in con tact with the surface of said magnetic disk and lifted I-- off from said magnetic disk by the rotation of said magnetic disk; a fan which circulates the air in said case; and a switch for operating said fan.
8. A magnetic disk apparatus wherein magnetic disk which rotates is housedin a case, comprising:
a magnetic head which is so arranged as to be in con tact with the surface of said magnetic disk and separated from said magnetic disk by the rotation of said magnetic disk; a motor which rotates said magnetic disk during the nonoperating period of the apparatus; and a control means for driving said motor in the case where predetermined conditions are satisfied.
9. a magnetic disk apparatus as set forth in Claim 8, further comprising: a means for measuring time during the nonoperating period of said apparatus, wherein said control means drives said motor until a predetermined time has elapsed.
10. A magnetic disk apparatus as set forth in Claim 8, further comprising: means for measuring time during the nonoperating period I,- 1, of the apparatus, wherein said control means drives said motor for a predetermined time after another predetermined time has elapsed.
11. A magnetic disk apparatus as set forth in Claim 8, 9 or 10 further comprising: means for detecting:the temperature in said case wherein said control means drives said motor in the case where the detected result by said means is lower than a predetermined temperature.
12. A magnetic disk apparatus as set forth in Claim 8, 9, 10 or 11 further comprising: means for detecting the temperature around the apparatus, wherein said control means drives said motor in the case where the detected result by said means is lower than a predetermined temperature.
13. A magnetic disk apparatus as set forth in Claim 8, 9, 10, 11 or 12 further comprising: means for detecting humidity in said case, wherein said control means drives said motor in the case where the detected result by said means is higher than a predetermined humidity.
IP 13
14. A magnetic disk apparatus wherein magnetic disk is housed in a case, comprising: a magnetic head which is so arranged as to be in contact with the surface of said magnetic disk and is lifted of from said magnetic disk by the rotation of said magnetic disk; a motor which rotates said magnetic disks during the nonoperating period of the apparatus; and a switch for operating said motor.
15. A magnetic disk apparatus constructed and arranged to operate substantially as hereinbefore described with reference to and as illustrated in Figures 2 to 5 of the accompanying drawings.
Published 1991 at The Patent Office. Concept House, Cardiff Road. Newport, Gwent NP9 1RH. Further copies may be obtained from Sales Branch. Unit 6. Nine Mile Point, Cwmfelinfach, Cross Keys, Newport. NP1 7HZ. Printed by Multiplex techniques ltd. St Mary Cray. Kent.
GB9112409A 1990-06-13 1991-06-10 Magnetic disk apparatus Withdrawn GB2245752A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6171290U JPH0420697U (en) 1990-06-13 1990-06-13

Publications (2)

Publication Number Publication Date
GB9112409D0 true GB9112409D0 (en) 1991-07-31
GB2245752A true true GB2245752A (en) 1992-01-08

Family

ID=13179117

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9112409A Withdrawn GB2245752A (en) 1990-06-13 1991-06-10 Magnetic disk apparatus

Country Status (3)

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JP (1) JPH0420697U (en)
DE (1) DE4118762A1 (en)
GB (1) GB2245752A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7058605B2 (en) * 1998-02-12 2006-06-06 Hewlett-Packard Development Company, L.P. Document transfer systems

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0643867A1 (en) * 1992-06-03 1995-03-22 Anembo Limited Apparatus for damping the transmission of audible noise generated by a disc drive

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1486070A (en) * 1975-04-02 1977-09-14 Ibm Magnetic disc file including a clean gas system
GB2051458A (en) * 1979-06-04 1981-01-14 Memorex Mini Disc Drive Corp Method of improving air flow in compact magnetic recordingdisc drice
US4255770A (en) * 1978-05-23 1981-03-10 Mitsubishi Denki Kabushiki Kaisha Dustproof type magnetic disc apparatus
GB2143668A (en) * 1980-03-05 1985-02-13 Papst Motoren Kg Disk storage drive
US4636891A (en) * 1982-02-11 1987-01-13 Cii Honeywell Bull Magnetic disc cartridge with ventilating structure
EP0356977A2 (en) * 1988-09-01 1990-03-07 Fujitsu Limited Rotating disc device
EP0373138A1 (en) * 1988-12-05 1990-06-13 Staar Societe Anonyme A drying device for recorder/player units

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4538192A (en) * 1982-06-14 1985-08-27 Rodime Limited Ventilation system for computer disc drive hub assembly
US4685303A (en) * 1985-07-15 1987-08-11 Allen-Bradley Company, Inc. Disc drive isolation system
US4718021A (en) * 1985-09-20 1988-01-05 Timblin Stanley W Technique for fan cycling to maintain temperature within prescribed limits
DE3828000C2 (en) * 1988-08-15 1997-01-16 Mannesmann Ag Power-protection device for electronic devices

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1486070A (en) * 1975-04-02 1977-09-14 Ibm Magnetic disc file including a clean gas system
US4255770A (en) * 1978-05-23 1981-03-10 Mitsubishi Denki Kabushiki Kaisha Dustproof type magnetic disc apparatus
GB2051458A (en) * 1979-06-04 1981-01-14 Memorex Mini Disc Drive Corp Method of improving air flow in compact magnetic recordingdisc drice
GB2143668A (en) * 1980-03-05 1985-02-13 Papst Motoren Kg Disk storage drive
US4636891A (en) * 1982-02-11 1987-01-13 Cii Honeywell Bull Magnetic disc cartridge with ventilating structure
EP0356977A2 (en) * 1988-09-01 1990-03-07 Fujitsu Limited Rotating disc device
EP0373138A1 (en) * 1988-12-05 1990-06-13 Staar Societe Anonyme A drying device for recorder/player units

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7058605B2 (en) * 1998-02-12 2006-06-06 Hewlett-Packard Development Company, L.P. Document transfer systems

Also Published As

Publication number Publication date Type
DE4118762A1 (en) 1991-12-19 application
JPH0420697U (en) 1992-02-20 application
GB9112409D0 (en) 1991-07-31 application

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)