WO1998028741A1 - Luftbetriebene drehscheibe - Google Patents
Luftbetriebene drehscheibe Download PDFInfo
- Publication number
- WO1998028741A1 WO1998028741A1 PCT/EP1997/006984 EP9706984W WO9828741A1 WO 1998028741 A1 WO1998028741 A1 WO 1998028741A1 EP 9706984 W EP9706984 W EP 9706984W WO 9828741 A1 WO9828741 A1 WO 9828741A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- turntable
- rotary table
- table according
- receiving part
- air
- Prior art date
Links
Classifications
-
- 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
- the invention relates to a turntable with a drivable rotationally symmetrical rotary plate, which is rotatably mounted in a receiving part.
- turntables It is known to hold turntables from turntables on mechanical or hydraulic bearings.
- the known turntable is driven by means of an electric motor which acts on the turntable, for example, via a belt or a friction wheel drive.
- a disadvantage of this type of storage and drive is that the turntable has relatively poor synchronization properties.
- the smooth running depends on the one hand on the quality of the mechanical bearing, through which irregularities can be transferred from the suspension to the turntable.
- the synchronism is very strongly influenced by the goodness of the electric motor. In order to achieve good synchronism properties, a great deal of construction work must be carried out, which is accompanied by correspondingly high financial expenditure.
- the known rotary tables can only be used to a limited extent, in particular for the description of optical storage media with a laser beam, since very high demands must be placed on the synchronous properties for the description.
- the object of the present invention is to provide a turntable which has good synchronism properties and is very smooth to run with a comparatively low construction cost. This object is achieved in that there is a gas, in particular air cushion, on which the turntable rests, between the turntable and the inner surface of the receiving part, and in that the turntable can be driven by a gas, in particular by an air stream.
- the turntable according to the invention is characterized by very good synchronism properties, since any fluctuations in the driving air flow have hardly any effect on the strength of the drive of the table. It is particularly advantageous to design the turntable as difficult as possible, since such a turntable can hardly be influenced by small changes in the driving force due to the large moment of inertia.
- the surface of the turntable acted upon by the air flow is roughened at least in sections in order to offer a certain resistance to the air flow. The roughness is greater than the roughness of the conical bearing surface and the roughness of the cylindrical side surface of the receptacle.
- the drive of the turntable is explained by the different flow velocities of the air flows on the turntable and on the wall of the holder.
- the storage needs a small air flow due to the small tolerances, which can be adjusted from below via a nozzle. If the drive nozzles are set accordingly, there is even no need for an air supply from below.
- the air cushion is therefore always a laminar layer that has no turbulence that affects smooth running.
- the turntable can be made from relatively roughly machined parts, since the receptacle is advantageously covered with a smooth plastic layer and, on the other hand, the turntable can be easily ground in the receptacle.
- the turntable according to the invention is thus inexpensive to manufacture and install. In addition, its great robustness makes it particularly simple Handling. It is particularly advantageous to use air as the gas for storage and drive.
- the receiving part has a conical receiving surface and the turntable has a correspondingly conical bearing surface.
- This arrangement ensures secure centering of the turntable m of the receptacle.
- the turntable advantageously has a cylindrical side surface which is acted upon by the air flow which emerges from air nozzles.
- the air nozzles are inserted into the corresponding cylindrical side surface of the receiving part.
- Another air nozzle is installed in the tip of the conical receiving surface. The air flow required for the air cushion can be adjusted through this nozzle.
- the air nozzles m of the side surface of the receptacle are approximately vertical m of the rotary plane and have an angle of attack of approximately 45 ° to the vertical on the turntable.
- the angle of the air nozzles is also variable, so that the speed of the rotation and the direction of rotation can be adjusted via their setting.
- the speed of the air entry through the openings can be adjustable in order to ensure precise control behavior.
- the side wall of the receiving part and possibly the receiving surface also have a defined roughness, the roughness of which is less than the roughness of the cylindrical side surface of the turntable. It is thereby achieved that a homogeneous layer of air on the surface is free, on which no turbulence can occur due to the formation of bubbles.
- a particularly simple and inexpensive embodiment of the turntable has an attachment part made of comparatively soft metal, especially aluminum.
- the receiving part can be turned from a complete block with little effort. It is also advantageous to manufacture the turntable from solid material.
- a blank can be pressed or forged, the circumference of which is turned to an exact size.
- the turntable according to the invention with its "zero bearing” is characterized by very good synchronism properties and low tolerances of only a few nanometers. It is therefore particularly advantageous to use for storing optical storage media, in particular blanks and / or master disks, when writing using a laser beam.
- the rotary speed of the rotary table is continuously adjustable from 0 to approx. 2000 revolutions per minute.
- Figure 2 is a plan view of a turntable.
- Figure 1 shows a section through a schematically illustrated turntable with a rotationally symmetrical turntable 2 made of metal, which is rotatably mounted on a receiving part 1 made of aluminum.
- An air flow m in the direction of arrow A can be introduced between the turntable 2 and the inner surface 3 of the receiving part 1 via an opening 4 in the form of a nozzle arranged centrally on the bottom of the receiving part 1.
- the Airflow creates an air cushion 5.
- the inside of the receiving part 1 is designed as a conical receiving surface 6 on which the turntable 2 rests with a conical bearing surface 7 with a corresponding angle.
- the receiving surface 6 and the bearing surface 7 are ground and polished surfaces.
- the inside of the receiving part 1 is coated with a thin layer of plastic 8, which brings about a refinement of the surface.
- the receiving part 1 has a side surface 9 above the conical receiving surface 6, which also tapers down conically in this particular exemplary embodiment.
- the angle of inclination is very small, in particular smaller than the angle of inclination of the receiving surface 6.
- the turntable 2 has a conical side surface 10 whose angle of inclination corresponds to that of the side surface 9.
- the opening 4 is located at the bottom of the receiving part 1 m the tip of the conical receiving surface.
- horizontal bores 11 are drilled into the side surface 9 of the receiving part and are tapered to form nozzles on their outlet side.
- An air stream (arrow B) can be introduced through the bores 11 between the receiving part 1 and the turntable 2.
- the side surface 10 of the turntable has a spell 12 of increased roughness, the roughness of which is greater than that of the other surfaces.
- the bores 11 have an angle of 45 ° to the radius of the turntable 2.
- the incoming air flow B acts on the rough web 12 and, because of the different flow velocities on the rough web 12 and the side surface 9, causes a propulsive force.
- the turntable 2 can thus be driven by the air flow B.
- the side wall of the turntable 2 has wing-like guide structures 13 which are attached to the overhang 14 above the bearing formed by the receiving part 1.
- the air flow C emerging from the bearing acts on the guide structures 13 and thus contributes to the drive.
- an annular channel 15 is introduced into the turntable 2 and filled with mercury.
Landscapes
- Holding Or Fastening Of Disk On Rotational Shaft (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97952935A EP0944902A1 (de) | 1996-12-23 | 1997-12-12 | Luftbetriebene drehscheibe |
AU56628/98A AU5662898A (en) | 1996-12-23 | 1997-12-12 | Air-driven rotating disc |
JP52832098A JP2001507431A (ja) | 1996-12-23 | 1997-12-12 | 空気式回転盤 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1996154051 DE19654051A1 (de) | 1996-12-23 | 1996-12-23 | Luftbetriebene Drehscheibe |
DE19654051.8 | 1996-12-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998028741A1 true WO1998028741A1 (de) | 1998-07-02 |
Family
ID=7816034
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1997/006984 WO1998028741A1 (de) | 1996-12-23 | 1997-12-12 | Luftbetriebene drehscheibe |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0944902A1 (de) |
JP (1) | JP2001507431A (de) |
AU (1) | AU5662898A (de) |
DE (1) | DE19654051A1 (de) |
WO (1) | WO1998028741A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105292528A (zh) * | 2015-11-25 | 2016-02-03 | 上海卫星装备研究所 | 三轴气浮台高压管路中心对称装置及其应用 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005300248A (ja) | 2004-04-08 | 2005-10-27 | Mitsutoyo Corp | 載置テーブル、表面性状測定機および表面性状測定方法 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4256312A (en) * | 1978-05-18 | 1981-03-17 | R & D Office Makoto Ltd. | Turn table device for record players |
JPS58200403A (ja) * | 1982-05-19 | 1983-11-22 | Micro Seiki Kk | エア−ベアリング式タ−ンテ−ブルシステム |
JPS592276A (ja) * | 1982-06-28 | 1984-01-07 | Toshiba Corp | 回転テ−ブル装置 |
US5215385A (en) * | 1990-03-16 | 1993-06-01 | Ide Russell D | Low-profile disk drive motor with deflecting-pad bearings |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3103364A (en) * | 1960-09-06 | 1963-09-10 | Macks | Phonograph turntable |
US5280465A (en) * | 1992-07-15 | 1994-01-18 | Minnesota Mining And Manufacturing Company | Fluid drive system for a rotating medium |
-
1996
- 1996-12-23 DE DE1996154051 patent/DE19654051A1/de not_active Withdrawn
-
1997
- 1997-12-12 WO PCT/EP1997/006984 patent/WO1998028741A1/de not_active Application Discontinuation
- 1997-12-12 EP EP97952935A patent/EP0944902A1/de not_active Withdrawn
- 1997-12-12 JP JP52832098A patent/JP2001507431A/ja active Pending
- 1997-12-12 AU AU56628/98A patent/AU5662898A/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4256312A (en) * | 1978-05-18 | 1981-03-17 | R & D Office Makoto Ltd. | Turn table device for record players |
JPS58200403A (ja) * | 1982-05-19 | 1983-11-22 | Micro Seiki Kk | エア−ベアリング式タ−ンテ−ブルシステム |
JPS592276A (ja) * | 1982-06-28 | 1984-01-07 | Toshiba Corp | 回転テ−ブル装置 |
US5215385A (en) * | 1990-03-16 | 1993-06-01 | Ide Russell D | Low-profile disk drive motor with deflecting-pad bearings |
Non-Patent Citations (2)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 008, no. 051 (P - 259) 8 March 1984 (1984-03-08) * |
PATENT ABSTRACTS OF JAPAN vol. 008, no. 086 (P - 269) 19 April 1984 (1984-04-19) * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105292528A (zh) * | 2015-11-25 | 2016-02-03 | 上海卫星装备研究所 | 三轴气浮台高压管路中心对称装置及其应用 |
Also Published As
Publication number | Publication date |
---|---|
AU5662898A (en) | 1998-07-17 |
EP0944902A1 (de) | 1999-09-29 |
JP2001507431A (ja) | 2001-06-05 |
DE19654051A1 (de) | 1998-06-25 |
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