WO1991005334A1 - Entrainement de disque avec rotor de moteur de broche dans une cartouche de disque amovible - Google Patents

Entrainement de disque avec rotor de moteur de broche dans une cartouche de disque amovible Download PDF

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Publication number
WO1991005334A1
WO1991005334A1 PCT/US1990/005519 US9005519W WO9105334A1 WO 1991005334 A1 WO1991005334 A1 WO 1991005334A1 US 9005519 W US9005519 W US 9005519W WO 9105334 A1 WO9105334 A1 WO 9105334A1
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WO
WIPO (PCT)
Prior art keywords
cartridge
disc
drive
housing
spindle motor
Prior art date
Application number
PCT/US1990/005519
Other languages
English (en)
Inventor
Syed Iftikar
Albert J. Guerini
Original Assignee
Syquest Technology
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
Application filed by Syquest Technology filed Critical Syquest Technology
Publication of WO1991005334A1 publication Critical patent/WO1991005334A1/fr

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B17/00—Guiding record carriers not specifically of filamentary or web form, or of supports therefor
    • G11B17/02—Details
    • G11B17/04—Feeding or guiding single record carrier to or from transducer unit
    • G11B17/041—Feeding or guiding single record carrier to or from transducer unit specially adapted for discs contained within cartridges
    • G11B17/043—Direct insertion, i.e. without external loading means
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/20—Driving; Starting; Stopping; Control thereof
    • G11B19/2009—Turntables, hubs and motors for disk drives; Mounting of motors in the drive
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/02—Containers; Storing means both adapted to cooperate with the recording or reproducing means
    • G11B23/03—Containers for flat record carriers
    • G11B23/0301—Details
    • G11B23/0318—Containers with incorporated transducing heads
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B25/00—Apparatus 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
    • G11B25/04—Apparatus 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
    • G11B25/043—Apparatus 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
    • 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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/54—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head into or out of its operative position or across tracks
    • G11B5/55—Track change, selection or acquisition by displacement of the head
    • G11B5/5521—Track change, selection or acquisition by displacement of the head across disk tracks

Definitions

  • the present invention is related to a disc drive which can accept a cartridge containing an information storage disc.
  • the spindle motor is in such arrangements are generally of the radial gap variety.
  • a discussion of radial gap motors can be obtained in U.S. Patent No. 4,745,345.
  • Other types of disc drives, such as floppy disc drives use an axial gap motor positioned in the drive.
  • a discussion of axial drive motors can also be obtained from the above U.S. Patent No. 4,745,345.
  • VCR use such axial gap motors for the spindle motor.
  • the cartridge receiving mechanism which receives and positions the cartridge onto the spindle of the spindle motor in the disc drive must by nature be complex as it is required in some manner to accept the cartridge and then position the cartridge over the spindle motor without contacting the upstanding spindle. Then the receiving mechanism must set the cartridge down onto the spindle of the spindle motor. For removing the cartridge, the reverse process must be accomplished.
  • the present invention is directed to overcoming the disadvantages of the prior art.
  • the present invention includes a disc drive which can receive a removable cartridge containing a disc mounted on a bearing arrangement. With such an arrangement the center of rotation of the disc with respect to the bearing arrangement is always the same, thereby eliminating the runout or wobble concerns.
  • the bearing arrangement includes a rotor assembly.
  • the rotor assembly is comprised of a multiplicity of permanent magnets.
  • the disc drive itself includes a housing including a receiving mechanism for receiving the cartridge.
  • the spindle motor of the disc drive is mounted in the housing and includes a stator assembly wh ⁇ ;h can operably engage the rotor assembly of the cartridge and can -4-
  • the spindle motor is mounted in such a manner such that with the cartridge received in the receiver mechanism, the stator assembly is spaced from the 5 rotor assembly.
  • the stator assembly includes a plurality of coils which can be appropriately energized to urge the rotor assembly to spin the disc. Further, the stator assembly of the spindle motor has an axial
  • the rotor assembly is completely encased by the cartridge housing so that there is no opening for dust to be urged into the cartridge as the bearing assembly is
  • the present arrangement provides for a stiff engagement between the rotor assembly and the stator assembly as together they form a spindle motor with the known
  • the bearing arrangement, to which the disc is secured, allows the center of rotation of the disc to be the same each time the cartridge is inserted into a drive.
  • runout and wobble due to misalignment of the disc with respect to the spindle motor is substantially eliminated.
  • the motor assembly and the stator assembly are configured in axial gap configurations.
  • It yet another object of the present invention to provide the rotor assembly located behind the cartridge housing so that no dust can be drawn in about the bearing arrangement as the disc revolves in the cartridge.
  • It yet another object of the present invention to provide for a cartridge which can be accurately and repeatedly engaged with a spindle motor of the disc motor so that runout and wobble are eliminated and so that the center of rotation of the disc with respect to the spindle motor is repeatedly the same.
  • Figure 1 depicts an embodiment of the disc drive of the invention which can accept an embodiment of a sealed cartridge of the invention and includes an actuator coil positioned in the drive.
  • Figure 2 depicts a sectional view taken through line 2-2 in Figure 1 with a cartridge inserted into the drive.
  • Figure 3 depicts an embodiment of the invention similar to Figure 1 but with an actuator permanent magnet located in the drive.
  • Figure 4 depicts an embodiment of a disc drive of the invention which can receive two cartridges of the invention.
  • Figure 5 depicts a sectional view of Figure
  • Figure 6 depicts a disc drive which accepts two cartridges and which cartridges can be secured permanently in the drive to provide for a disc drive with fixed cartridges and thus fixed discs.
  • Figure 7 is a top, partially cut away view of another embodiment of the cartridge invention.
  • Figure 8 is a section view taken through line 8-8 of Figure 7.
  • Figure 9 is a section view taken through line 9-9 of Figure 7.
  • Figure 10 is still another embodiment of the drive and cartridge of the present invention shown in a view similar to the view of Figure 8.
  • Figure 11 is a top view with the top plate and certain elements removed of another embodiment of the drive of the present invention.
  • Figure 12 depicts a plan view of an embodiment of a disc drive of the present invention with the cover of the housing of the disc drive and of the cartridge removed.
  • Figure 13 depicts a cross-sectional view taken through line 13-13 of Fig. 12
  • Figure 14 depicts an enlarged view of an embodiment of the stator assembly of the spindle motor of the disc drive of Fig. 13
  • Figure 15 depicts an enlarged view of the rotor assembly of the cartridge of the disc drive of Fig. 12.
  • Figure 16 depicts an alternative embodiment of the invention with the read/write head and a component of a head actuator permanently affixed inside the cartridge.
  • FIG. 17 depicts an alternative embodiment including a two port disc drive.
  • Disc drive 20 includes a housing 24 with side mounting brackets 26. Housing 24 further includes a faceplate 28. Faceplate 28 includes a cartridge ejection button 30 and a mode selection button 32. The faceplate 28 further includes a hinged door 34 which is urged out of the way by the sealed cartridge 22 as it is inserted into the disc drive 20.
  • a receiver mechanism 36 for the disc drive includes tracks 38 upon which the sealed cartridge 22 slides as it is inserted into the drive 20. These tracks 38 allow the cartridge 22 to be inserted in a straight-in manner.
  • the receiver mechanism 36 includes a stop 40 which limits the rearward motion of cartridge 22 as it is inserted into the drive 20.
  • the disc drive 20 further includes a spindle motor assembly 42 which is mounted to the housing 24.
  • the spindle motor assembly 42 includes a motor 44 and a clutch plate 46 which is comprised in a preferred embodiment of eight alternating north and south poles. It is to be understood that there may be as few as only a single north and a single south pole in the clutch plate 46 as well as many more than the eight alternating north and south poles.
  • cartridge 22 As can be seen in Fig. 2, with the cartridge 22 inserted into the housing 24, cartridge 22 as will be described more fully hereinbelow, is spaced from the clutch plate 46 and the spindle motor assembly 42 so that there is no physical connection between the clutch plate 46 and the spindle motor assembly 42.
  • Fig. 2 with the cartridge 22 inserted into the housing 24, cartridge 22 as will be described more fully hereinbelow, is spaced from the clutch plate 46 and the spindle motor assembly 42 so that there is no physical connection between the clutch plate 46 and the spindle motor assembly 42.
  • the disc drive 20 further includes an actuator 47 which in a preferred embodiment is comprised of a coil 48 such as used, in voice coil motor actuators for disc drives in general.
  • This coil 48 is positioned in the disc drive 20 in such a way that it can be used, in conjunction with permanent magneto 50 in cartridge 22, to actuate the read/write heads positioned in the sealed cartridge 22 as will be explained hereinbelow.
  • the disc drive 20 includes a data transfer connector 52 whi ⁇ h is compatible with a connector of the cartridge 22 as will be explained hereinbelow.
  • this connector 52 includes an infrared sensor and an infrared source for allowing data to be transferred between the drive 20 and the cartridge 22 without physical contact between the connector 52 on the drive 20 and the connector 54 on the sealed cartridge 22.
  • the connectors 52, 54 can alternatively be comprised of transformers in order to transmit data to and from the sealed cartridge 22.
  • the connector 52 can include contact points which are physically directly contacted with the contact points of the connector 54 on the cartridge 22. Still further a prong and receptacle arrangement such as shown in Fig. 3 can be used to transfer data.
  • Disc drive 20 includes a cartridge loading and unloading motor 56 which powers a roller 58, which in a preferred embodiment can be comprised of rubber, in a clockwise direction in order to load the cartridge into the housing 24 and in a counterclockwise manner in order to unload the cartridge 22 from the housing 24.
  • Cartridge loading motor 56 brings the cartridge 22 to rest against stop 40.
  • Depressing button 30 causes motor 56 to eject cartridge 22 from disc drive 20.
  • the disc drive 20 further includes a cartridge locking plunger 60 which is shown in Fig. 1 in solid lines in an unlocked position and in phantom lines in a locked position.
  • This cartridge locking plunger 60 causes a cartridge to be locked in to the housing 24 against the stop 40.
  • Depressing button 30 also releases plunger 60 from the loaded position.
  • the cartridge 22 of the invention is also depicted in Fig. 1.
  • Cartridge 22 includes a housing 70 which in a preferred embodiment is comprised of a rugged plastic material. Located inside of the cartridge 22 in a preferred embodiment are two data storage discs 72, 74. These discs 72, 74 are mounted for rotation about axis 75 on a hub assembly 76.
  • Hub assembly 76 includes armature plates 77, 83 which are located externally to cartridge housing 70 adjacent lower side 79 and upper side 85 of the sealed cartridge 22.
  • plates 77, 83 are comprised of alternating north and south magnetic poles that can be engaged by the clutch plate as described below.
  • a head such as read/write head 80
  • Other heads 81 are shown in a phantom below head 80.
  • the heads 80, 81 are supported by a head arm assembly 82.
  • the head arm assembly 82 is secured to an actuator assembly 84 which is provided for rotation about axis 86.
  • the axis 86 of rotation for head arm assembly 82 is substantially parallel, in a preferred embodiment, to that of axis 75 of the hub assembly 76.
  • Secux- d to the actuator assembly 84 is the above-mentioned magnet 50.
  • movement of the magnet 50 which in a preferred embodiment is a permanent magnet, as caused by the coil 48 in the drive results in the movement of the read/write heads 80, 81 relative to the discs.
  • An internal housing 90 which in a preferred embodiment is comprised of steel, is located inside of the cartridge housing 70 and is used to mount the axis 75, 86 in order to provide the appropriate structural integrity for keeping these axis properly aligned.
  • Co municating with the read/write heads 80, 81 is an appropriate read/write circuitry 92 which is located inside the cartridge 20 and which is associated with an energy storage device such as the battery 94, which powers the read/write circuitry 92.
  • a cable 96 provides communication between the heads 80, 81 and the read/write circuitry 92, while another cable 98 provides communication between the read/write circuitry 92 and the connector 54.
  • Also provided in the cartridge 22 is an air filter 100 which filters the gas which is provided in the cartridge 22.
  • an inert gas such as argon is used to fill the cartridge.
  • This inert gas allows the heads 80, 81 to fly lower and closer to the discs and thus increases the capacity of the disc to store data. Further, as there is no atmosphere in cartridge 22, there is no condensation, and friction is reduced. After the gas is injected into the cartridge 22, cartridge 22 is hermetically sealed to all but eliminates contamination damage to the discs and heads. In operation, the cartridge 22 is inserted into the door 34 of the disc drive 20 with the cartridge load motor 56 urging the cartridge into the disc drive 20 and against the stop 40.
  • the armature plate 77 With the cartridge 22 fully inserted into the drive 20 the armature plate 77, whi ⁇ h is the circular magnetic plate located adjacent to the lower side 79 of the cartridge 22 comes into alignment with the magnetic clutch plate 46 of the spindle motor assembly 42.
  • the eight north and south pole segments of the armature plate 77 engage with the eight north and south pole segments of the clutch plate 46 such that the turning of the clutch plate 46, as caused by the spindle motor 44, causes the armature plate 77 and thus the discs 72, 74 to spin at the proper rotational velocity.
  • the cartridge locking plunger 60 locks the cartridge in place with the permanent magnet 50 aligned underneath the coil 48 of the actuator 47. With power being applied to the coil 48, the magnet 50 is urged to move and properly position the heads relative to the disc. With the heads properly positioned, data can be transferred to or read from the discs by the use of the connectors 52, 54 which provide for the transfer of information from the cartridge to the disc drive.
  • the actuator 110 associated with the drive 20 includes first and second magnets 112, 114 which in a preferred embodiment are permanent magnets.
  • the cartridge 22 includes an actuator assembly 116 and a coil 118. Unlike the read/write cir ⁇ uitry 92, the coil 118 draws substantial power, requiring that power to be provided to the cartridge directly from drive 20 in order to operate the coil assembly 118.
  • a standard prong and recepta ⁇ le arrangement is provided with prongs 120 extending from the data transfer ⁇ onnector 52 in the drive 20 for mating with the receptacles in the data transfer connector 52 in the drive 20 for mating with the receptacles in the data transfer connector 54 of the cartridge 22.
  • FIG. 4 Another alternative embodiment 130 of the invention is shown in Figs. 4 and 5.
  • elements which are similar to those shown in the embodiments in Figs. 1 through 3 are numbered identically.
  • Fig. 4 it can be seen that the disc drive 130 is provided for receiving two cartridges, cartridge 22 and cartridge 23.
  • Cartridge 22 is inserted as described hereinabove.
  • Cartridge 23 is inserted through a second door 132. It is to be understood that cartridge 22 and 23 are identical.
  • the drive 130 includes an actuator assembly 134 which has first and second coils 136, 138. Each coil is used to actuate the magnets associated with the heads into the cartridges 22, 23 in order to cause the heads to traverse the discs.
  • Disc drive 130 includes first and second connectors 140, 142 for providing data transfer connections to the cartridges that are inserted in the drive as discussed hereinabove.
  • the spindle motor assembly 144 is mounted though a plate 146 which divides the drive 130 into two compartments, one compartment for each of the cartridges 22, 23.
  • the spindle motor assembly 144 includes a spindle motor 148, upper and lower magnetic clutch plates 150, 152 similar in design and concept to the magnetic clutch plate 46 in Fig. 1.
  • a cartridge 22 inserted through the upper door 34 would have an armature plate, such as armature plate 77 in alignment with the upper magnetic clut ⁇ h plate 150, while the armature plate 83 of cartridge 23 would be in alignment with the lower magnetic clutch plate 152.
  • Drive 130 includes a mode selector switch 154 which allows the drive 130 to be placed in one of the several modes.
  • the first mode allows a host computer to selectively place data on one or the other cartridges as directed by the host.
  • the second mode allows for automatic and instantaneous backup, in that data is recorded simultaneously on both the first cartridge as the primary cartridge and on the second cartridge as the backup cartridge.
  • FIG. 6 Another embodiment of the invention is shown in Fig. 6.
  • cartridges 22 and 23 are permanently affixed into drive 160 by appropriate securing mechanisms such as screws 162, 164.
  • the disc drive of the invention can be converted into a fixed drive with the capacity of currently available fixed drives.
  • ea ⁇ h disc in the cartridge contains approximately fifty to one hundred megabytes of information and thus each cartridge ⁇ an ⁇ ontain approximately one hundred to two hundred megabytes of information.
  • the two cartridges fixed into drive 160 giving this drive
  • FIG. 7, 8 and 9 Another embodiment 200 of the removable cartridge of the present invention is depicted in Figs. 7, 8 and 9.
  • This embodiment includes an outer housing 202 includes a top 206 and a base 208 and the inner housing 204 includes a top 210 and a base 212.
  • the top 206 of the cartridge 200 has been partially cut away in order to reveal the positioning of the inner housing 204.
  • the inner housing 204 is mounted to the base 208 of the outer housing 202 with shock mounts 214.
  • the shock mounts 214 can include, by way of example only, rubber mounts used to secure the inner housing 204 to the outer housing 202.
  • top 206 and the base 208 of the outer housing 202 are sealed together by methods known in the trade in order to prevent additional contaminants from reaching inside of the outer housing.
  • top 210 and the base 212 of the inner housing 204 are sealed in order to prevent additional contaminants from reaching the inside of the inner housing.
  • the present embodiment has the advantage that should the cartridge 200 be dropped, the housing and the shock mounts insulate the discs 216, 218 from the shock of impact.
  • the four heads 220 mounted on the head arm assembly 222 are also insulated from shock by the shock mounts 214.
  • the heads 220 and the head arm assembly 222 are shown in phantom in Fig. 7.
  • Also shown in phantom in Fig. 7 is the actuator assembly 224.
  • the head arm assembly 222 and the actuator assembly 224 pivot about axis 226 as is demonstrated by the three positions of the heads 220 shown in phantom in Fig. 7.
  • the actuator assembly 224 includes a voice coil type mechanism 228 which has upper and lower permanent magnets 230, 232 and an electromagneti ⁇ 234.
  • the permanent magnets 230, 232 which are affixed to the top 210 and base 212 of the inner house 204, respectively.
  • the electromagnet 234 is mounted on an extension of the head arm assembly 222 pivot about axis 226 such that as the current to the electromagnet 234 changes, the position of the electromagnet 234 and the position of the arm assembly 222 and heads 220 change in order to position the heads at a desired location relative to the tracks on the discs 216, 218.
  • a connector 236 is provided for communic?ting data signals to and from the heads 220 and position signals to the actuator assembly 224.
  • the connector 236 mates with a conne ⁇ tor positioned in the drive as demonstrated by the other embodiments.
  • each cartridge includes upper and low agneti ⁇ armature plates 252, 254. These armature plates 252, 254 extend from the outer housing 256 of the ⁇ artridge 250.
  • the cartridges 250 can be positioned in either the upper receiving mechanism 258 or the lower receiving mechanism 260 of the drive 262 without inverting the cartridge as in either receiving mechanism 258, 260, both the upper clutch plate 264 and the lower clutch plate 266 of the spindle motor 268 are magnetic and can engage either the upper armature plate 252 or the lower armature plate 254 which is placed adjacent thereto.
  • the cartridge 250 includes shutter mechanisms such as shutter mechanism 270 which are used to cover both the upper and lower armature plate 252, 254.
  • the shutter mechanism 270 is comprised of a material, known in the art, which can provide a magnetic field shield.
  • the shutter mechanisms are spring loaded by spring mechanism 272. Just prior to the cartridge 250 being ejected from the drive, the drive releases the spring mechanism 272 so that the spring mechanism
  • FIG. 272 can cause the shutter 270 to be positioned over the magnetic armature plates, 252, 254 in order to break the magnetic bond between the armature plates and the clut ⁇ h plates. With the ⁇ artridge removed from the drive, the shutter prevents metallic objects from being attracted to the armature plates.
  • the drive overrides the spring mechanism 272 to urge the shutter 270 away from its covering position exposing the magnetic field of the armature plate 254 to the magnetic field of the clut ⁇ h plate 264 of the spindle motor 268.
  • shutters 274, 276 have been urged into non-shielding positions.
  • Figure 11 depicts yet an alternative embodiment 300 of the drive with a cartridge loading mechanism 302.
  • This loading mechanism 302 includes an upper loading mechanism 304 and a lower loading mechanism 306.
  • the upper loading mechanism 304 is used to urge the cartridge into and eject the cartridge out of the upper receiving mechanism while the lower loading mechanism 306 is used similarly in conjunction with the lower port.
  • the upper loading me ⁇ hanism 304 in ⁇ ludes a motor 308 and a pulley arrangement 310 whi ⁇ h links the motor to a spring loaded mounting frame 312, whi ⁇ h mounts rollers 314, 316. Through the pulley 310, the motor 308 can drive the rollers 314, 316 in order to urge the ⁇ artridge into the housing and eje ⁇ t the cartridge from the housing.
  • Associated with the frame is a microswit ⁇ h 315.
  • the spring loaded frame 312 is urged from its rest position triggering microswit ⁇ h 315 whi ⁇ h ⁇ auses the motor 308 to turn on ⁇ ausing the rollers 314, 316 to urge the cartridge into the drive.
  • An eje ⁇ t button on the face of the drive causes the motor to drive the rollers 314, 316 in the opposite direction ejecting the ⁇ artridge.
  • the lower load mechanism 306 works in a similar manner.
  • the disc drive 20 of the present invention provides for a simple, efficient, and economical drive and hermetically sealed cartridge.
  • the drive contains a spindle motor having a magnetic clut ⁇ h plate for magneti ⁇ ally engaging the magnetic armature plate of the cartridge so that there is not ⁇ onta ⁇ t between the ⁇ artridge and the spindle motor assembly.
  • the reoeiver me ⁇ hanism of the dis ⁇ drive is not required to align the dis ⁇ s with the spindle motor using the expensive te ⁇ hniques of the prior art devi ⁇ es.
  • the a ⁇ tuator is divided into ⁇ omponents, one lo ⁇ ated in the drive and the other in the ⁇ artridge so that the cartridge can be completely sealed with the heads 80, 81 permanently located in the ⁇ artridge 22 and positioned with respe ⁇ t to the dis ⁇ s 72, 74.
  • ⁇ artridge is truly sealed, unlike prior art devi ⁇ es whi ⁇ h require shutter doors to allow a ⁇ es ⁇ into the ⁇ artridge, ⁇ artridge contamination can all but be eliminated.
  • the present invention also provides for a data transfer connector which is an infrared signal sender and sensor so that the cartridge and the housing do not have to be connected.
  • the cartridge 22 is ruggedized so that it can withstand harsh treatment while being transported from device to device.
  • Drive 420 in ⁇ ludes a housing 424 under whi ⁇ h is pivotally mounted head arms 426 onto whi ⁇ h are mounted the read/write heads 428.
  • An a ⁇ tuator 429 ⁇ auses the heads 428 to be pivoted into and out of engagement with the dis ⁇ 430 mounted in the removable ⁇ artridge 422.
  • a spindle motor 432 is depicted mounted on the base 434 of the disc drive 420.
  • Spindle motor 432 is of an axial gap configuration.
  • the spindle motor 432 includes a stator assembly 436 which includes a motor lamination assembly 438 having upstanding members such as members 440, 442, 444.
  • a plurality of phase coil windings are provided about the upstanding members.
  • the lamination assembly 438 is comprised of a magnetically permeable material.
  • coil winding 446, 452 and 458 are electrically communi ⁇ ated with ea ⁇ h other.
  • ⁇ oil windings 448, 454 and 460 as well as ⁇ oil windings 450, 456 and 462 are ele ⁇ tri ⁇ ally ⁇ o muni ⁇ ated with each other in order to provide for a stator assembly 436 which has three phases.
  • the removable cartridge 422 includes a housing 464, with a planar top 475 and a planar bottom 476, the top 465 of which was removed in Fig. 12 in order to show the inside details.
  • a cartridge housing door 466 which allows the head arm assembly 426 and the read/write heads 428 to be pivoted into the cartridge 422 into contact with the disc 430.
  • cartridge 422 is received by cartridge receiving mechanism 435.
  • the removable cartridge 422 includes a bearing arrangement 468 which is used to rotatably mount the disc 430 inside the cartridge housing 464. Screw 470 accomplishes the mounting of the bearing arrangement 468 in the cartridge housing 64.
  • a rotor assembly 472 whi ⁇ h in ⁇ ludes, in a preferred embodiment, a plurality of permanent magnets 474.
  • permanent magnets are disposed adjacent the planar bottom wall 476 of the cartridge housing 464.
  • the cartridge 422 can slide directly into the disc drive 420 and into position immediately over the spindle motor 432 without any requirement of a linkage or other mechanism to allow the disc to first be positioned above the spindle motor and then be urged into an engagement with a spindle of the spindle motor.
  • an axial gap is defined between the rotor assembly 472 and the stator assembly 436.
  • the planar bottom wall 476 of the removable ⁇ artridge 422 is disposed in this axial gap.
  • Fig. 15 depi ⁇ ts a bottom view of the rotor assembly 472 showing the individual permanent magnets 474.
  • there are six permanent magnets which alternate between north and south poles. The six magnets are provided in a cir ⁇ ular ⁇ onfiguration.
  • the embodiment of Fig. 16 includes an entirely sealed cartridge housing 464' whi ⁇ h includes permanently pivotally mounted therein the head arm assemblies 246' and the read/write head 428' along with an actuator component 484 which is actuated by the actuator assembly 429' in order to position the heads 428' relative to the disc 430'.
  • the present arrangement of Fig. 16 includes all the advantages of the arrangements of Figs. 12 through 15 and in addition includes an entirely sealed cartridge due to the fact that the heads and the actuator component are sealed within the housing of the cartridge and thus as the disc 430' spins, no dust can be drawn into the cartridge 422'.
  • FIG. 17 Yet another embodiment of the invention is shown in Fig. 17.
  • the embodiment of Fig. 17 includes a disc drive 490 which has dual cartridge receiving ports 492, 494.
  • Drive 490 includes a stator assembly 496 of a spindle motor 498 which in part defines two axial gaps 500, 502.
  • the stator assembly 496 includes nine phase coil windings as does the stator assembly of the embodiment of Figs. 12 through 16.
  • the removable cartridges 504 and 506 can be respectively positioned through the ports 492, 494 so as to rest on a cartridge receivers 508, 510.
  • the stator assembly 496 and the spindle motor 498 are mounted between the two cartridge receivers 508, 510 by a mounting structure 512.
  • each of the ⁇ artridges such as cartridge 504 includes a bearing arrangement 514 which has a rotor assembly 516 which includes a first and second multiplicity of permanent magnets 518, 520. These magnets are arranged much as shown in the other embodiments of the invention. From such an arrangement, it is evident that the cartridges 504, 506 can be positioned in either port 492 or port 494.
  • the operation of the present invention is as follows. Initially the removable cartridge 422 is inserted into a drive so that the stator assembly 436 of the spindle motor 432 is aligned with the rotor assembly 472 of the ⁇ artridge 422. The spindle motor 432 then ⁇ auses the dis ⁇ to come up to rotational speed and the heads are then disposed onto the disc so that normal read/write operations can oc ⁇ ur. After the read/write operations are ⁇ ompleted the above procedure is reversed in order to remove the disc from the ⁇ artridge.
  • the present invention provides for a dis ⁇ drive and removable cartridge arrangement whi ⁇ h eliminates * wobble and runout problems, eliminates the dust problems, and provides for a highly repeatable system where the ⁇ enter of rotation of the disc is always positioned in the same manner with respect to the bearing arrangement and the rotor assembly.
  • the present invention does not require a complex cartridge receiver mechanism.

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  • Rotational Drive Of Disk (AREA)

Abstract

Une unité d'entraînement (420) de disque comprend un moteur (432) d'une broche ayant un ensemble de stators (436) qui est prévu dans une configuration d'espace radial. Une cartouche amovible (422) comprend un ensemble à rotor (472) monté sur un agencement de palier (468) sur lequel est monté le disque (430) contenu dans la cartouche (422). Lorsque l'on place la cartouche (422) dans l'unité d'entraînement (420), l'ensemble à rotor (472) de la cartouche (422) vient en alignement avec l'ensemble à stator (436) de l'unité d'entraînement (420) de sorte que le moteur (432) de la broche fait tourner le disque (430) contenu dans la cartouche (422) en le faisant tourner à la vitesse appropriée.
PCT/US1990/005519 1989-10-05 1990-09-27 Entrainement de disque avec rotor de moteur de broche dans une cartouche de disque amovible WO1991005334A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US41774889A 1989-10-05 1989-10-05
US417,748 1989-10-05

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WO1991005334A1 true WO1991005334A1 (fr) 1991-04-18

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PCT/US1990/005519 WO1991005334A1 (fr) 1989-10-05 1990-09-27 Entrainement de disque avec rotor de moteur de broche dans une cartouche de disque amovible

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5525861A (en) * 1978-08-15 1980-02-23 Nec Corp Magnetic disc cartridge
US4359762A (en) * 1980-05-13 1982-11-16 Stollorz Herbert R Removable storage module and module
US4535434A (en) * 1980-03-27 1985-08-13 Sony Corporation Optical disc and disc drive mechanism
US4571718A (en) * 1984-07-11 1986-02-18 Eastman Kodak Company Optical disk cartridge and cooperating apparatus
US4581667A (en) * 1982-04-19 1986-04-08 Minnesota Mining And Manufacturing Company Magnetic hold-down for recording disc
US4636904A (en) * 1983-09-20 1987-01-13 Seiko Seiki Kabushiki Kaisha Hermetically sealed magnetic disk cartridge

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5525861A (en) * 1978-08-15 1980-02-23 Nec Corp Magnetic disc cartridge
US4535434A (en) * 1980-03-27 1985-08-13 Sony Corporation Optical disc and disc drive mechanism
US4359762A (en) * 1980-05-13 1982-11-16 Stollorz Herbert R Removable storage module and module
US4581667A (en) * 1982-04-19 1986-04-08 Minnesota Mining And Manufacturing Company Magnetic hold-down for recording disc
US4636904A (en) * 1983-09-20 1987-01-13 Seiko Seiki Kabushiki Kaisha Hermetically sealed magnetic disk cartridge
US4571718A (en) * 1984-07-11 1986-02-18 Eastman Kodak Company Optical disk cartridge and cooperating apparatus

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