WO2006087646A1 - An optical disc device having a turntable-integrated drive motor - Google Patents

An optical disc device having a turntable-integrated drive motor Download PDF

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Publication number
WO2006087646A1
WO2006087646A1 PCT/IB2006/050353 IB2006050353W WO2006087646A1 WO 2006087646 A1 WO2006087646 A1 WO 2006087646A1 IB 2006050353 W IB2006050353 W IB 2006050353W WO 2006087646 A1 WO2006087646 A1 WO 2006087646A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical disc
rotor housing
drive motor
turntable
disc device
Prior art date
Application number
PCT/IB2006/050353
Other languages
French (fr)
Inventor
Fook W. Ho
Godfrey F. W. Ting
Original Assignee
Arima Devices Corporation
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 Arima Devices Corporation filed Critical Arima Devices Corporation
Publication of WO2006087646A1 publication Critical patent/WO2006087646A1/en

Links

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
    • G11B17/022—Positioning or locking of single discs
    • G11B17/028—Positioning or locking of single discs of discs rotating during transducing operation
    • G11B17/0282—Positioning or locking of single discs of discs rotating during transducing operation by means provided on the turntable
    • 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

Definitions

  • An optical disc device having a turntable-integrated drive motor
  • the invention is related to an optical disc device, such as a recording and/or playback device, comprising a drive motor for driving the optical disc, wherein the drive motor has a rotor housing which is rotatable around its axis, and wherein a substantially flat radial outer surface of the rotor housing forms a turntable for engagement with the optical disc.
  • Such optical disc device is described in EP-A-1365399, wherein the drive motor is a small outer-rotor-type brushless spindle motor having a stationary portion provided with a stator core with coils and a rotating portion comprising the rotor housing with a drive magnet attached to it.
  • the upper surface of the rotor housing functions as a turntable, which turntable can abut against the central part of the side of the optical disc, in order to drive the optical disc in its rotational motion.
  • the radially extending surface of the rotor housing that forms the turntable can be provided with friction- increasing means and/or may comprise a coaxial annular protrusion in order to provide an appropriate engagement with the side of the rotating optical disc. Furthermore, additional components for guiding the optical disc to its required position on the turntable and keeping the optical disc in that position have to be present.
  • the object of the invention is to provide an optical disc device comprising a drive motor with a rotating rotor housing, wherein a radial outer surface of the rotor housing forms the turntable for engagement with the optical disc, and wherein no additional components for guiding the optical disc to its required position and for centering the optical disc on the turntable are required.
  • the central part of the rotor housing has a coaxial protrusion to form a guiding and positioning member for the optical disc, which protrusion extends through the central hole in the optical disc when the optical disc is in its rotating position on the turntable.
  • effective optical disc guiding and positioning means are an integral part of the rotor housing, which means can be created in the normal production operation of the rotor housing, for example when the rotor housing is made from metal sheet material by means of a pressing operation.
  • said radial outer surface is a flat or substantially flat surface.
  • the protrusion comprises a substantially cylindrical portion for centering the rotating optical disc and preferably the protrusion has a substantially annular convex conical outer surface for guiding the optical disc into its engaged position.
  • the optical disc can be easily placed by hand in the appropriate position on the turntable, whereby further clamping means can push the optical disc against the flat radial surface of the turntable.
  • the optical disc can also be placed by means of a moving tray, whereby the tray slides to the appropriate position and the drive motor with turntable ascends from below to engage with the disc. Thereby the conical surface will guide the optical disc to its correct rotating position.
  • the rotor housing is provided with an annular friction surface for abutting against the central part of one side of the optical disc, which friction surface can be created by applying a layer of additional material on the turntable.
  • the rotor housing is provided with a coaxial annular protrusion for abutting against the central part of one side of the optical disc, whereby a correct positioning of the rotating optical disc is ensured.
  • the central part of the rotor housing is attached to a coaxially positioned rotatable spindle, which spindle can revolve in a bearing that is attached to the stationary part of the drive motor.
  • the rotor housing comprises (a) a substantially coaxial cylindrical portion, wherein the magnet of the drive motor is attached to the inner side of that cylindrical portion, and which cylindrical portion surrounds the stationary stator core with coils of the drive motor, (b) a substantially flat radial portion for abutting against the central part of one side of the optical disc, (c) a substantially coaxial cylindrical portion for centering the rotating optical disc, and (d) a substantially coaxial conical portion for guiding the optical disc to its engaged position.
  • the invention is related to a drive motor for an optical disc device, which drive motor has a rotor housing which is rotatable around its axis, wherein a radial outer surface of the rotor housing forms a turntable for engagement with an optical disc, and wherein the central part of the rotor housing comprises a coaxial protrusion to form a guiding and positioning member for the optical disc.
  • said radial outer surface is a flat or substantially flat surface.
  • Fig. 1 is a cross section of the drive motor along the line I-I in figure 2
  • Fig. 2 is a top view of the drive motor.
  • the drive motor has a base plate 1, which base plate 1 is provided with a number of holes 2 in order to bolt it to the frame of an optical disc device.
  • a bearing 3 is attached to the center of base plate 1, and a spindle 4 can rotate in bearing 3 around a vertical axis 5.
  • the rotor housing 6 of the drive motor is attached to the spindle 4, so that also rotor housing 6 can rotate around axis 5.
  • Rotor housing 6 is made from metal sheet material by means of a pressing operation and is rotationally symmetrical with respect to central axis 5.
  • the rotor housing 6 comprises a cylindrical portion 7, a flat radial portion 8, a cylindrical portion 9, a conical portion 10, a flat radial portion 11 and a cylindrical portion 12.
  • Cylindrical portion 12 of the rotor housing 6 is clamped to the spindle 4.
  • the magnet 13 of the drive motor is attached to the inner side of cylindrical portion 7 of the rotor housing 6.
  • the rotor housing 6, together with the magnet 13, can rotate around the stator core 14 with the coils 15. Thereby, the stationary stator core 14 is attached to bearing 3.
  • the flat radial portion 8 of the rotor housing 6 is provided with an annular layer 16 of special material having a high coefficient of friction with respect to the surface of the optical disc, in such way that the rotor housing 6 can drive the optical disc in an effective way.
  • Annular layer 16 forms a protrusion with respect to flat radial surface 8, so that the rotating disc is engaged by said annular layer 16.
  • clamping means in another part of the optical disc device, which clamping means press against the other side of the rotating optical disc.
  • the cylindrical portion 10 of the rotor housing 6 is provided with spring biased balls pressing against the upper edge of the central opening of the optical disc.
  • Figure 2 shows the drive motor in top view, indicated with arrow 17 in figure 1.
  • the diameter of the drive motor is for example 30 mm, and the total height of the assembly is for example less than 10 mm, due to the integration of the rotor housing 6 and the turntable 8,16.

Landscapes

  • Holding Or Fastening Of Disk On Rotational Shaft (AREA)
  • Rotational Drive Of Disk (AREA)

Abstract

An optical disc device comprising a drive motor for driving the optical disc. The drive motor has a rotor housing (6) which is rotatable around its axis (5). A flat radial outer surface (8) of the rotor housing (6) forms a turntable for engagement with the optical disc. The central part of the rotor housing (6) comprises a coaxial protrusion (9,10,11) to form a guiding and positioning member for the optical disc. The protrusion (9,10,11) may comprise a cylindrical portion (9) for centering, and a conical portion (10) for guiding the rotating optical disc.

Description

An optical disc device having a turntable-integrated drive motor
The invention is related to an optical disc device, such as a recording and/or playback device, comprising a drive motor for driving the optical disc, wherein the drive motor has a rotor housing which is rotatable around its axis, and wherein a substantially flat radial outer surface of the rotor housing forms a turntable for engagement with the optical disc.
Such optical disc device is described in EP-A-1365399, wherein the drive motor is a small outer-rotor-type brushless spindle motor having a stationary portion provided with a stator core with coils and a rotating portion comprising the rotor housing with a drive magnet attached to it. The upper surface of the rotor housing functions as a turntable, which turntable can abut against the central part of the side of the optical disc, in order to drive the optical disc in its rotational motion. An advantage of such integral motor- turntable assembly is the reduced overall height of the assembly and the reduction of the number of parts of the device, whereby the rotor housing, including said turntable, can be made from one piece of metal sheet material. The radially extending surface of the rotor housing that forms the turntable can be provided with friction- increasing means and/or may comprise a coaxial annular protrusion in order to provide an appropriate engagement with the side of the rotating optical disc. Furthermore, additional components for guiding the optical disc to its required position on the turntable and keeping the optical disc in that position have to be present. The object of the invention is to provide an optical disc device comprising a drive motor with a rotating rotor housing, wherein a radial outer surface of the rotor housing forms the turntable for engagement with the optical disc, and wherein no additional components for guiding the optical disc to its required position and for centering the optical disc on the turntable are required. To accomplish this object, the central part of the rotor housing has a coaxial protrusion to form a guiding and positioning member for the optical disc, which protrusion extends through the central hole in the optical disc when the optical disc is in its rotating position on the turntable. Thereby, effective optical disc guiding and positioning means are an integral part of the rotor housing, which means can be created in the normal production operation of the rotor housing, for example when the rotor housing is made from metal sheet material by means of a pressing operation. Generally, said radial outer surface is a flat or substantially flat surface.
In a preferred embodiment, the protrusion comprises a substantially cylindrical portion for centering the rotating optical disc and preferably the protrusion has a substantially annular convex conical outer surface for guiding the optical disc into its engaged position. Thereby, the optical disc can be easily placed by hand in the appropriate position on the turntable, whereby further clamping means can push the optical disc against the flat radial surface of the turntable. The optical disc can also be placed by means of a moving tray, whereby the tray slides to the appropriate position and the drive motor with turntable ascends from below to engage with the disc. Thereby the conical surface will guide the optical disc to its correct rotating position.
Preferably, the rotor housing is provided with an annular friction surface for abutting against the central part of one side of the optical disc, which friction surface can be created by applying a layer of additional material on the turntable. In one preferred embodiment, the rotor housing is provided with a coaxial annular protrusion for abutting against the central part of one side of the optical disc, whereby a correct positioning of the rotating optical disc is ensured.
In a preferred embodiment, the central part of the rotor housing is attached to a coaxially positioned rotatable spindle, which spindle can revolve in a bearing that is attached to the stationary part of the drive motor. By clamping the rotor housing around a portion of the spindle, a simple structure, without further components, can be achieved.
In a preferred embodiment, the rotor housing comprises (a) a substantially coaxial cylindrical portion, wherein the magnet of the drive motor is attached to the inner side of that cylindrical portion, and which cylindrical portion surrounds the stationary stator core with coils of the drive motor, (b) a substantially flat radial portion for abutting against the central part of one side of the optical disc, (c) a substantially coaxial cylindrical portion for centering the rotating optical disc, and (d) a substantially coaxial conical portion for guiding the optical disc to its engaged position. Furthermore, the invention is related to a drive motor for an optical disc device, which drive motor has a rotor housing which is rotatable around its axis, wherein a radial outer surface of the rotor housing forms a turntable for engagement with an optical disc, and wherein the central part of the rotor housing comprises a coaxial protrusion to form a guiding and positioning member for the optical disc. Generally, said radial outer surface is a flat or substantially flat surface.
The invention will now be further elucidated by means of a description of an example of a drive motor for an optical disc device, which drive motor has a rotor housing which is rotatable around its axis, wherein reference is made to the drawing comprising two figures, in which:
Fig. 1 is a cross section of the drive motor along the line I-I in figure 2, and Fig. 2 is a top view of the drive motor.
As is shown in figure 1, the drive motor has a base plate 1, which base plate 1 is provided with a number of holes 2 in order to bolt it to the frame of an optical disc device. A bearing 3 is attached to the center of base plate 1, and a spindle 4 can rotate in bearing 3 around a vertical axis 5. The rotor housing 6 of the drive motor is attached to the spindle 4, so that also rotor housing 6 can rotate around axis 5.
Rotor housing 6 is made from metal sheet material by means of a pressing operation and is rotationally symmetrical with respect to central axis 5. The rotor housing 6 comprises a cylindrical portion 7, a flat radial portion 8, a cylindrical portion 9, a conical portion 10, a flat radial portion 11 and a cylindrical portion 12. Cylindrical portion 12 of the rotor housing 6 is clamped to the spindle 4. The magnet 13 of the drive motor is attached to the inner side of cylindrical portion 7 of the rotor housing 6. The rotor housing 6, together with the magnet 13, can rotate around the stator core 14 with the coils 15. Thereby, the stationary stator core 14 is attached to bearing 3.
The flat radial portion 8 of the rotor housing 6 is provided with an annular layer 16 of special material having a high coefficient of friction with respect to the surface of the optical disc, in such way that the rotor housing 6 can drive the optical disc in an effective way. Annular layer 16 forms a protrusion with respect to flat radial surface 8, so that the rotating disc is engaged by said annular layer 16.
In order to push the optical disc against the flat radial surface 8, or the annular layer 16 respectively, there may be clamping means in another part of the optical disc device, which clamping means press against the other side of the rotating optical disc. In another embodiment, the cylindrical portion 10 of the rotor housing 6 is provided with spring biased balls pressing against the upper edge of the central opening of the optical disc. Such clamping means are known per se.
Figure 2 shows the drive motor in top view, indicated with arrow 17 in figure 1. The diameter of the drive motor is for example 30 mm, and the total height of the assembly is for example less than 10 mm, due to the integration of the rotor housing 6 and the turntable 8,16.
The embodiment of the drive motor of an optical device as described above is only an example; a great many other embodiments and variations are possible.

Claims

CLAIMS:
1. An optical disc device comprising a drive motor for driving an optical disc, wherein the drive motor has a rotor housing (6) which is rotatable around its axis (5), wherein a radial outer surface (8) of the rotor housing (6) forms a turntable for engagement with the optical disc, and wherein a central part of the rotor housing (6) comprises a coaxial protrusion (9, 10, 11 ) to form a guiding and positioning member for the optical disc.
2. An optical disc device as claimed claim 1, characterized in that said protrusion (9,10,11) comprises a substantially cylindrical portion (9) for centering the rotating optical disc.
3. An optical disc device as claimed in any one of the preceding claims, characterized in that said protrusion (9,10,11) comprises a substantially annular convex conical outer surface (10) for guiding the optical disc into its engaged position.
4. An optical disc device as claimed in any one of the preceding claims, characterized in that said rotor housing (6) is provided with an annular friction surface (16) for abutting against the central part of one side of the optical disc.
5. An optical disc device as claimed in any one of the preceding claims, characterized in that said rotor housing (6) is provided with a coaxial annular protrusion (16) for abutting against the central part of one side of the optical disc.
6. An optical disc device as claimed in any one of the preceding claims, characterized in that the central part of said rotor housing (6) is attached to a coaxially positioned rotatable spindle (4).
7. An optical disc device as claimed in any one of the preceding claims, wherein the rotor housing (6) comprises
(a) a substantially coaxial cylindrical portion (7), wherein a magnet (13) of the drive motor is attached to the inner side of said portion (7), which portion surrounds the stationary stator core (14) with coils (15) of the drive motor,
(b) a substantially flat radial portion (8) for abutting against the central part of one side of the optical disc, (c) a substantially coaxial cylindrical portion (9) for centering the rotating optical disc, and
(d) a substantially coaxial conical portion (10) for guiding the optical disc in its engaged position.
8. A drive motor for an optical disc device, which drive motor has a rotor housing (6) which is rotatable around its axis (5), wherein a radial outer surface (8) of the rotor housing (6) forms a turntable for engagement with an optical disc, and wherein the central part of the rotor housing (6) has a coaxial protrusion (9,10,11) to form a guiding and positioning member for the optical disc.
PCT/IB2006/050353 2005-02-18 2006-02-02 An optical disc device having a turntable-integrated drive motor WO2006087646A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP05101214.4 2005-02-18
EP05101214 2005-02-18

Publications (1)

Publication Number Publication Date
WO2006087646A1 true WO2006087646A1 (en) 2006-08-24

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2006/050353 WO2006087646A1 (en) 2005-02-18 2006-02-02 An optical disc device having a turntable-integrated drive motor

Country Status (2)

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TW (1) TW200641801A (en)
WO (1) WO2006087646A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08102115A (en) * 1994-09-29 1996-04-16 Mitsumi Electric Co Ltd Disk device
JPH10172216A (en) * 1996-12-06 1998-06-26 Sankyo Seiki Mfg Co Ltd Disc holding mechanism of disc drive
JPH1125555A (en) * 1997-07-02 1999-01-29 Pioneer Electron Corp Turntable device of disk player and its manufacture
JP2001037141A (en) * 1999-07-15 2001-02-09 Hitachi Ltd Disk motor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08102115A (en) * 1994-09-29 1996-04-16 Mitsumi Electric Co Ltd Disk device
JPH10172216A (en) * 1996-12-06 1998-06-26 Sankyo Seiki Mfg Co Ltd Disc holding mechanism of disc drive
JPH1125555A (en) * 1997-07-02 1999-01-29 Pioneer Electron Corp Turntable device of disk player and its manufacture
JP2001037141A (en) * 1999-07-15 2001-02-09 Hitachi Ltd Disk motor

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1996, no. 08 30 August 1996 (1996-08-30) *
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 11 30 September 1998 (1998-09-30) *
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 04 30 April 1999 (1999-04-30) *
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 19 5 June 2001 (2001-06-05) *

Also Published As

Publication number Publication date
TW200641801A (en) 2006-12-01

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