WO2006061322A1 - Actuator for an optical scanner - Google Patents
Actuator for an optical scanner Download PDFInfo
- Publication number
- WO2006061322A1 WO2006061322A1 PCT/EP2005/056135 EP2005056135W WO2006061322A1 WO 2006061322 A1 WO2006061322 A1 WO 2006061322A1 EP 2005056135 W EP2005056135 W EP 2005056135W WO 2006061322 A1 WO2006061322 A1 WO 2006061322A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- actuator
- coils
- printed coils
- magnets
- lens holder
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0925—Electromechanical actuators for lens positioning
- G11B7/0933—Details of stationary parts
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/095—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following specially adapted for discs, e.g. for compensation of eccentricity or wobble
- G11B7/0956—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following specially adapted for discs, e.g. for compensation of eccentricity or wobble to compensate for tilt, skew, warp or inclination of the disc, i.e. maintain the optical axis at right angles to the disc
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/22—Apparatus or processes for the manufacture of optical heads, e.g. assembly
Definitions
- the present invention relates to an actuator for a scanner for optical storage media, and to an appliance for reading from and/or writing to optical storage media which uses an actuator such as this.
- Actuators for optical scanners generally use wound coils in conjunction with permanent magnets, in order to focus a light beam for reading from and/or writing to an optical storage medium onto an information layer of the optical storage medium.
- the actuator in this case controls both the tracking and the focussing of the focus relative to a data track in the information layer of the optical storage medium.
- Printed coils are also used for actuators, instead of wound coils . These are printed circuits with printed copper tracks, that is to say the copper tracks run parallel to the magnet. Fundamentally, this principle operates in the same way as that of wound coils.
- the advantages of printed coils include a simple process for assembly of the actuator, saving of winding machines, and a lower second actuator resonance.
- conventional coils are very much more variable, in terms of the wire thickness and the number of windings.
- the area available for printing of the printed circuits is limited, and the separation between the individual tracks must not be less than a specific amount, either. The number of tracks is thus restricted. Wound coils therefore allow greater actuator sensitivity to be achieved than printed coils.
- One object of the invention is to propose an actuator for an optical scanner, which uses printed coils and at the same time is more sensitive.
- an actuator for an optical scanner having a lens holder for holding an objective lens and printed coils for focussing and tracking control, with six printed coils being arranged on each of two opposite faces of the lens holder and interacting with associated magnets, each having sixteen poles.
- the specific magnetization makes it possible to use a larger area of the lens holder for the arrangement of printed coils.
- One magnet is fitted to each of two opposite faces of the lens holder, and is magnetized with 16 poles.
- 16 poles and suitable shaping of the magnets allows six printed coils to be arranged on each of the two faces of the lens holder. This results in a sensitivity increase of 20-30% in comparison to existing actuators with printed coils.
- the focussing coil can optionally also be used for a tilt function by appropriately selecting the current flow through the coils.
- the pole pitch of the magnets advantageously runs obliquely, at least in places, with respect to the printed coils which are provided for tracking control. This allows optimization of the 16-pole magnetization, because the disturbing influences of the magnets for the focussing coils for the tracking coils located alongside them is now reduced. This allows the sensitivity losses to be kept as small as possible.
- An actuator according to the invention is preferably used in an appliance for reading from and/or writing to optical storage media.
- Figure 1 shows a scanner for optical storage media, which uses an actuator according to the invention
- Figure 2 shows the scanner from Figure 1 after removal of a cover
- Figure 3 shows a further view of the optical scanner from Figure 2;
- Figure 4 shows an actuator according to the invention, without magnets
- Figure 5 shows the actuator according to the invention, with magnets
- Figure 6 shows an exploded drawing of the actuator with magnets
- Figure 7 shows those parts of the printed coils which are relevant for tracking and focussing control
- Figure 8 shows a schematic explanation relating to the inclined pole pitch
- Figure 9 shows a schematic illustration of the magnet poles
- Figure 10 shows an exploded drawing of an actuator with magnets according to the prior art.
- Figure 1 shows a scanner 1 for optical storage media, which uses an actuator 2 according to the invention for focussing and tracking control, by vertical and horizontal movement of an objective lens 7.
- the actuator 2 is partially concealed by a cover 8.
- the optical scanner 1 is illustrated in Figure 2 after removal of the cover 8.
- the actuator 2 has a lens holder 3 for holding the objective lens 7, and two magnets 4 which are arranged at the side of the lens holder 3 and interact with associated printed coils 5, 6 (which cannot be seen in Figure 2) for focussing and tracking control.
- Figure 3 shows a view of the optical scanner 1 from a different perspective. Further elements of the optical scanner 1 are known to those skilled in the art and will not be explained in any more detail here.
- Figure 4 illustrates the lens holder 3 with the printed coils 5, 6, that is to say the actuator 2 without magnets 4.
- the printed coils 5, 6 each comprise four printed coils 5 for focussing control and two printed coils 6 for tracking control.
- the arrows that are shown denote the current flow within the printed coils 5, 6. If the magnetization of the magnets 4 is considered in this context, in the form that they are sketched in Figure 5 and Figure 6, then this results in the actuator 2 being moved in accordance with the "right-hand rule". Only eight magnet poles can be seen in each case in Figure 5 and Figure 6.
- the associated opposing poles are located on the rear face of the magnets 4.
- the focussing coils 5 can optionally also be used for a tilt function, by appropriately selecting the current flowing through the coils.
- Figure 7 shows those components of the printed coils 5, 6 which are actually relevant for tracking and focussing control. Only the shaded areas contribute to the movement of the lens holder 3. The other components remain unused.
- FIG 8 provides an explanation relating to the inclined pole pitch.
- the inclined pole pitch represents an optimization of the 16-pole magnetization.
- One advantage of this embodiment over a straight pole pitch is that the disturbing influences of the magnets for the focussing coils 5 on the tracking coils 6, which are located alongside them, are reduced. Appropriate polarization of the magnetization is required for any- desired movement. When an opposite magnet pole now acts, this automatically leads to sensitivity losses. With a straight pole pitch, the shaded areas would have a disturbing effect in the direction of the arrow on the tracking coils 6. This is prevented by the special design of the magnet poles. If consideration is also given to the fact that only the upper part and lower part are relevant for the focussing coils 5 as shown in Figure 7, then the inclined pole pitch leads to no sensitivity losses for focussing control.
- Figure 9 shows a schematic illustration of the magnets 4 in the form of a front view ( Figure 9a) ) , a plan view ( Figure 9b) ) and a perspective view ( Figure 9c) ) .
- Mutually adjacent magnet poles with opposite magnetization are in this case emphasized by shading. The shading does not indicate that the magnets 4 are composed of separate parts .
- FIG 10. An actuator according to the prior art is shown in Figure 10. This uses magnets 4 with 8-pole magnetization, which interact with two focussing coils 5 and two tracking coils 6. As can easily be seen, the area that is available for the printed coils is not utilized completely. Furthermore, the straight pole pitch results in disturbing influences on the tracking coils 6. Overall, this results in the sensitivity of the actuator 2 being reduced.
Landscapes
- Optical Recording Or Reproduction (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/791,305 US20080123202A1 (en) | 2004-12-09 | 2005-11-22 | Actuator For An Optical Scanner |
EP05817154A EP1861851B1 (en) | 2004-12-09 | 2005-11-22 | Actuator for an optical scanner |
DE602005008647T DE602005008647D1 (en) | 2004-12-09 | 2005-11-22 | ACTUATOR FOR AN OPTICAL SCANNER |
JP2007544875A JP2008523532A (en) | 2004-12-09 | 2005-11-22 | Actuator for optical scanner |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004059587 | 2004-12-09 | ||
DE102004059587.9 | 2004-12-09 | ||
EP05102532.8 | 2005-03-31 | ||
EP05102532A EP1708183A1 (en) | 2005-03-31 | 2005-03-31 | Actuator for optical pickup |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006061322A1 true WO2006061322A1 (en) | 2006-06-15 |
Family
ID=36096224
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2005/056135 WO2006061322A1 (en) | 2004-12-09 | 2005-11-22 | Actuator for an optical scanner |
Country Status (5)
Country | Link |
---|---|
US (1) | US20080123202A1 (en) |
EP (1) | EP1861851B1 (en) |
JP (1) | JP2008523532A (en) |
DE (1) | DE602005008647D1 (en) |
WO (1) | WO2006061322A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101889309B (en) * | 2007-12-04 | 2012-06-13 | 三菱电机株式会社 | Objective lens drive device and optical pickup device |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4666236B2 (en) * | 2008-06-09 | 2011-04-06 | ソニー株式会社 | Optical pickup and disk drive device |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5663840A (en) * | 1994-06-14 | 1997-09-02 | Nec Corporation | Objective lens actuator for optical head and used for high speed access |
JP2002208152A (en) * | 2000-11-08 | 2002-07-26 | Pioneer Electronic Corp | Lens driving apparatus |
JP2002245647A (en) * | 2001-02-20 | 2002-08-30 | Matsushita Electric Ind Co Ltd | Object lens driving device |
US20030058550A1 (en) * | 2001-09-21 | 2003-03-27 | Ju Chae Min | Position control unit for lens of optical pickup device |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100200872B1 (en) * | 1996-01-09 | 1999-06-15 | 윤종용 | Actuator for optical pickup device |
US5986983A (en) * | 1997-11-19 | 1999-11-16 | Eastman Kodak Company | Multiple degrees of freedom actuator for optical recording |
US6344936B1 (en) * | 1999-09-29 | 2002-02-05 | Matsushita Electric Industrial Co., Ltd. | Objective lens driving apparatus |
DE60029901T2 (en) * | 1999-10-15 | 2006-12-21 | Pioneer Corporation | Lens driving device |
JP3888821B2 (en) * | 2000-02-09 | 2007-03-07 | パイオニア株式会社 | Pickup device and manufacturing method thereof |
US6570720B2 (en) * | 2000-03-29 | 2003-05-27 | Tdk Corporation | Objective lens drive device of optical pickup |
JP4236078B2 (en) * | 2000-07-04 | 2009-03-11 | パイオニア株式会社 | Optical pickup device |
EP1205920B1 (en) * | 2000-11-08 | 2004-05-26 | Pioneer Corporation | Lens driving apparatus |
EP1355301A3 (en) * | 2002-04-20 | 2006-03-29 | Lg Electronics Inc. | Optical pick-up actuator |
JP2003346359A (en) * | 2002-05-27 | 2003-12-05 | Pioneer Electronic Corp | Coil substrate for lens drive and lens drive |
-
2005
- 2005-11-22 JP JP2007544875A patent/JP2008523532A/en not_active Abandoned
- 2005-11-22 WO PCT/EP2005/056135 patent/WO2006061322A1/en active IP Right Grant
- 2005-11-22 US US11/791,305 patent/US20080123202A1/en not_active Abandoned
- 2005-11-22 EP EP05817154A patent/EP1861851B1/en not_active Expired - Fee Related
- 2005-11-22 DE DE602005008647T patent/DE602005008647D1/en active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5663840A (en) * | 1994-06-14 | 1997-09-02 | Nec Corporation | Objective lens actuator for optical head and used for high speed access |
JP2002208152A (en) * | 2000-11-08 | 2002-07-26 | Pioneer Electronic Corp | Lens driving apparatus |
JP2002245647A (en) * | 2001-02-20 | 2002-08-30 | Matsushita Electric Ind Co Ltd | Object lens driving device |
US20030058550A1 (en) * | 2001-09-21 | 2003-03-27 | Ju Chae Min | Position control unit for lens of optical pickup device |
Non-Patent Citations (2)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 2002, no. 11 6 November 2002 (2002-11-06) * |
PATENT ABSTRACTS OF JAPAN vol. 2002, no. 12 12 December 2002 (2002-12-12) * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101889309B (en) * | 2007-12-04 | 2012-06-13 | 三菱电机株式会社 | Objective lens drive device and optical pickup device |
Also Published As
Publication number | Publication date |
---|---|
JP2008523532A (en) | 2008-07-03 |
DE602005008647D1 (en) | 2008-09-11 |
EP1861851A1 (en) | 2007-12-05 |
EP1861851B1 (en) | 2008-07-30 |
US20080123202A1 (en) | 2008-05-29 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP3678729B2 (en) | Actuator for optical pickup | |
US20100271912A1 (en) | 3d actuator for otpical disc system | |
EP2136365B1 (en) | High-sensitivity pickup actuator for disc drive | |
EP1861851B1 (en) | Actuator for an optical scanner | |
EP1931185A1 (en) | Printed circuit board for an optical pickup with interleaved tilt and focus windings printed thereon | |
JP2003346359A (en) | Coil substrate for lens drive and lens drive | |
US5359459A (en) | Optical system driving apparatus | |
KR100970723B1 (en) | Objective lens driving apparatus for optical pickup | |
CN100550145C (en) | Photoscanner's actuator | |
US7724614B2 (en) | Optical pickup actuator | |
CN101430895A (en) | Objective lens actuator and a disc apparatus using the same therein | |
KR100344586B1 (en) | Pick-up actuator | |
JP3371384B2 (en) | Two-axis actuator | |
JPH06243492A (en) | Optical pickup actuator | |
JP2005100497A (en) | Objective lens driving device | |
JP2000207757A (en) | Objective lens driving device for optical disk drive | |
KR20010017381A (en) | Pick-up actuator | |
JP2007095175A (en) | Optical pickup | |
KR100806062B1 (en) | Optical pickup apparatus and optical recording/reproducing system employing the optical pickup apparatus | |
KR100354063B1 (en) | Pick-up actuator | |
EP1914763A1 (en) | Printed circuit board having printed coils thereon | |
KR20070008278A (en) | Tri-axial driving optical pickup actuator using fine pattern coil | |
KR19980070243A (en) | Head shifter and optical head shifter | |
JP3105628B2 (en) | Optical pickup actuator | |
JPH10134381A (en) | Objective lens driving device |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KM KN KP KR KZ LC LK LR LS LT LU LV LY MA MD MG MK MN MW MX MZ NA NG NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SM SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LT LU LV MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 3570/DELNP/2007 Country of ref document: IN |
|
WWE | Wipo information: entry into national phase |
Ref document number: 11791305 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2005817154 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2007544875 Country of ref document: JP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 200580042481.1 Country of ref document: CN |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWP | Wipo information: published in national office |
Ref document number: 2005817154 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 11791305 Country of ref document: US |
|
WWG | Wipo information: grant in national office |
Ref document number: 2005817154 Country of ref document: EP |