CN1154988C - Device for driving object lens - Google Patents
Device for driving object lens Download PDFInfo
- Publication number
- CN1154988C CN1154988C CNB998122661A CN99812266A CN1154988C CN 1154988 C CN1154988 C CN 1154988C CN B998122661 A CNB998122661 A CN B998122661A CN 99812266 A CN99812266 A CN 99812266A CN 1154988 C CN1154988 C CN 1154988C
- Authority
- CN
- China
- Prior art keywords
- object lens
- holding member
- aforementioned
- fixed
- metal wire
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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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
- G11B7/0932—Details of sprung supports
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/023—Mountings, adjusting means, or light-tight connections, for optical elements for lenses permitting adjustment
-
- 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
- G11B7/0935—Details of the moving parts
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
The present invention relates to an apparatus for driving an object lens which reads recorded information on a rotary driven compact disc in an optical means. A holding component (2) of the object lens is held by a relay holding component (71) through four first metal wires (61). The relay holding component (71) is held by a fixed component (72) through four second metal wires (62). A first free vibration system taking the first metal wires (61) as main components and a second free vibration system taking the second metal wires (62) as main components improve the acceleration sensitivity acting on the holding component (2) of the object lens on different rotary frequency bands of the compact disc corresponding to different resonance frequency respectively formed. Therefore, the present invention improves the trace sensitivity of light points to the displacement of information recording channels at least on two rotary frequency bands of the compact disc.
Description
Technical field
The present invention relates to objective lens device, this objective lens device reaches in the focus direction parallel with the optical axis of these object lens and drives the object lens that are used for reading with optical mode the information that writes down on the disk record medium of rotation driving on the tracking direction vertical with optical axis.
Background technology
In the objective lens device in the information regenerator of the information that on the disk record medium that reads the rotation driving with optical mode, writes down, as the supporting mechanism of one of its object lens holding member, just like monolateral fixed support pattern with 4 a wires end separately is fixed on the aforementioned object lens holding member, the other end is fixed in fixed part.In this monolateral fixed support pattern, according to the movable body quality that comprises aforementioned object lens holding member with mainly be the spring constant of aforementioned metal line, decide the first resonance frequency of aforementioned objective apparatus.
In this first resonance frequency band, in order to significantly improve driving sensitivity to the extra current that flows through aforementioned objective lens device, make the first resonance frequency band roughly consistent during design with the rotation frequency band of aforementioned recording medium, be easy to guarantee the luminous point that generates by the object lens that are fixed on the aforementioned object lens holding member like this, the required acceleration of the displacement on information recording channel focus direction and tracking direction that tracking is caused by the rotation of aforementioned recording medium, thereby required focusing and tracking servo performance can guarantee to read the optical information of aforementioned information regenerating unit the time.
In recent years, in the CD-ROM regenerating unit, with respect to the existing standard transfer rate that is used for the recorded information of music program regeneration etc., the data that developed into as 4 times of speed, 8 times of speed, 16 times of speed transmit high speed, from becoming the main flow in CD-ROM regenerating unit market.The high speed that this kind data transmit, be to realize by the rotational speed of quickening as the CD of information recording carrier, and under this rotational speed, require the objective lens device of the light sensing of the information that reads to possess acceleration sensitivity required when having the luminous point that generates by object lens correctly to follow the tracks of the displacement of CD information track.
In order to satisfy above-mentioned requirements, existing objective lens device improves its first resonance frequency along with the increase of disk rotation speed, and be designed to rotate in the frequency band, can obtain peak acceleration sensitivity in the focus direction of the information of generation recording channel and the CD of the maximum displacement on the tracking direction.
But existing objective lens device is, improve the first resonance frequency that aforementioned objective lens device is had according to transmitting the increase that turns to the disk rotation speed of purpose at a high speed with data, therefore there is following problem, promptly near the CD the DC band rotates frequency band, acceleration sensitivity during optical tracking information recording channel displacement that reduction is generated by aforementioned object lens, the performance under the standard transfer rate of the data when being applicable to as the music playback of the standard feature of CD-ROM regenerating unit etc. is affected like this.
Brief summary of the invention
The present invention makes for the problem of eliminating above-mentioned existing objective lens device, and its purpose is to provide a kind of objective lens device, improves the tracking sensitivity of luminous point for the displacement of information recording channel at two CD rotation frequency bands at least.
Objective lens device of the present invention, comprise: the object lens holding member that is wound with focusing coil and tracking coil on the periphery, be used to keep object lens, described focusing coil is used for producing driving force on the focus direction parallel with the optical axis of described object lens, and described tracking coil is used for producing driving force on the tracking direction vertical with optical axis; 4 first metal wires, one end are fixed on the described object lens holding member, and the other end is fixed on the relaying holding member; 4 second metal wires, one end are fixed on the described relaying holding member, and the other end is fixed on fixedly on the support; And between described focusing coil and tracking coil, keep predetermined gap and be configured in flux circuit components on the described fixedly support relatively, be used for by passing through described second metal wire, described relaying holding member, described first metal wire and described object lens holding member from described fixedly support, supply with drive current to described focusing coil and tracking coil, and form the magnetic field that produces the Lorentz driving force; Wherein, utilize the elastic deformation of aforementioned first metal wire and support aforementioned object lens holding member movably, utilize the elastic deformation of aforementioned second metal wire and support the relaying holding member movably by the aforementioned fixation support by aforementioned relaying holding member.Can constitute two free oscillating systems thus: movably gross mass and 4 first first free oscillating systems that the metal wire spring constant is determined of the parts such as aforementioned object lens holding member that are supported of mode with the elastic deformation of first metal wire, and by 4 second metal wires keep aforementioned relaying holding member in fixed part and with the elastic deformation of this second metal wire the movably gross mass of parts such as the aforementioned object lens holding member that is supported of mode and relay part, and second free oscillating system that spring constant was determined of 4 second metal wires.And by suitably selecting the quality of these component parts and the spring constant of aforementioned metal line, at the frequency band that is lower than the resonant frequency that aforementioned first free oscillating system brings, cause the aforementioned second free oscillation system intrinsic resonance effect.The result, the frequency band separately of the resonant frequency that resonant frequency that is brought in the aforementioned first free oscillation system and the aforementioned second free oscillation system are brought, the acceleration sensitivity that acts on the object lens holding member of aforementioned objective lens device rises, make aforementioned first free oscillating system intrinsic resonant frequency roughly consistent with the optical disk high-speed gyro frequency that is transmitted as purpose with data high-speed, thereby improve the tracking sensitivity of aforementioned luminous point to the displacement of aforementioned information recording channel, and then, the resonance that utilizes aforementioned second free oscillating system to be produced, the aforementioned luminous point of the CD rotation frequency band of raising under the standard transfer rate of data is to the tracking performance of aforementioned information recording channel displacement, thereby at two CD rotation frequency bands, improve the tracking sensitivity of luminous point at least to the displacement of information recording channel.
Description of drawings
Fig. 1 is the planimetric map of objective lens device of the present invention.
Fig. 2 is the stereographic map of objective lens device of the present invention.
Fig. 3 represents an example of the acceleration frequency characteristic of existing objective lens device.
That Fig. 4 represents is existing, transmit the example of acceleration frequency characteristic of the objective lens device of high speed corresponding to data according to the rising of first resonance frequency.
Fig. 5 represents an example of the acceleration frequency characteristic of objective lens device of the present invention.
Embodiment
Below, implement preferred forms of the present invention with reference to description of drawings, be example with the objective lens device of the light picker that is used for the CD-ROM regenerating unit.As shown in Figures 1 and 2, at the periphery coiling focusing coil 3 of the object lens holding member 2 that keeps object lens 1, its generation is parallel to the driving force on the focus direction of optical axis of aforementioned object lens 1; And tracking coil 4, it produces perpendicular to the driving force on the tracking direction of objective lens optical axis.And be fixed with printed base plate 5 in the both sides of object lens holding member 2.Aforementioned focusing coil 3 and aforementioned tracking coil 4 separately two terminals and an end of each first metal wire 61 by described printed base plate 5, be connected and fixed by solder joint 13, so finish conducting between focusing coil 3 and tracking coil 4 and 4 wires 61; The other end of simultaneously aforementioned each first metal wire 61 is connected and fixed on the printed base plate 81 of relaying support 71 in advance by solder joint 13, finish conducting between described metal wire 61 and the printed base plate 81.
That is to say that aforementioned object lens holding member 2 is the elastic deformations by 4 first metal wires 61, is supported by relaying support 71 in a movable manner.And, by an end of 4 second metal wires 62 being fastened on the printed base plate 81 that is fixed on the aforementioned relaying support 71, thereby finish conduct with aforementioned first metal wire 61 in, the other end of this second metal wire 62 is fastened in advance by Screw 11 by solder joint 13 and is fixed on the printed base plate 82 on the fixing support 72, thereby finishes conducting between second metal wire 62 and the printed base plate 82.Should be fixedly the part that is fixed with metal wire 62 of support 72 be inlaid with the damping part of forming by spring etc. 14.In addition, this fixedly support 72 be fixed on the fixed parts such as device pedestal.
That is to say that aforementioned relaying support 71 is by the elastic deformation of 4 piece second metal wires 62 parallel with aforementioned first metal wire 61, the part that is fixed is in a movable manner supported.The 10th, be fixed on the yoke 9 of fixed part, and and aforementioned focusing coil 3 and 4 of tracking coils leave space and opposed magnet, and constitute flux circuit components with this magnet 10 and yoke 9.This magnet 10 is decided drive current according to the institute that is provided by aforementioned first metal wire 61 and second metal wire 62, is formed on the magnetic field of aforementioned focusing coil 3 and tracking coil 4 generation Lorentz lorentz driving forces.So, when in aforementioned focusing coil 3 and tracking coil 4, flowing through electric current, can obtain to be parallel to the focus direction of object lens 1 optical axis and, thereby carry out focus servo and tracking servo action perpendicular to the displacement of the aforementioned object lens holding member 2 of the tracking direction of optical axis.
Fig. 3 represents the acceleration frequency characteristic of existing objective lens device.Wherein as can be seen, the obvious increase of acceleration gain in the first resonance frequency band, and, can improve the tracking sensitivity of the luminous point of objective lens device to the displacement of information recording channel by making this frequency band roughly consistent with the rotation frequency band of aforementioned CD.Further, under situation about the CD gyro frequency being improved, as shown in Figure 4, can improve the tracking sensitivity of required frequency band by the first resonance frequency that improves objective lens device for data transmit high speed.But, near the DC band frequency band acceleration gain is the rising along with the first resonance frequency, reduce with the speed that is inversely proportional to frequency ascending amount square, therefore become low speed rotation frequency band, the principal element that sensitivity descended when aforementioned luminous point 21 was followed the tracks of 23 displacements of aforementioned information recording channels at the aforementioned CD 22 of the music playback that is applicable to the CD-ROM regenerating unit etc.
In the embodiments of the invention, as previously mentioned, supporting mechanism as aforementioned object lens holding member 2, use 4 to be two groups of metal wires of one group, wherein one group first metal wire 61 is that the one end is fixed in aforementioned object lens holding member 2, the other end is fixed in relaying holding components 71, thereby constitutes gross mass, and first free oscillating system that spring constant determined of aforementioned first metal wire 61 of the parts of being supported by aforementioned first metal wire 61; And second metal wire 62 of another group is that the one end is fixed in aforementioned relaying holding components 71, the other end is fixed in fixed part, thereby constitutes gross mass, and second free oscillating system that spring constant determined of aforementioned second metal wire 62 of the parts of being supported by aforementioned second metal wire 62.In addition, suitably select the quality of component parts separately and the spring constant of aforementioned metal line 61 and 62, as shown in Figure 5 aforementioned first free oscillating system intrinsic first resonance frequency band, with aforementioned second free oscillating system that is lower than described frequency band intrinsic first resonance frequency band in the two, improve the acceleration gain that acts on aforementioned object lens holding member 2.
As mentioned above, supporting mechanism as object lens holding member 2, to be two groups of metal wires 61 of one group with 4,62 constitute two groups of free oscillation systems, and by make first free oscillating system intrinsic resonant frequency roughly consistent with the optical disk high-speed rotation frequency band that is transmitted as purpose with data high-speed, the acceleration that acts on aforementioned object lens holding member 2 is improved in aforementioned CD high speed rotating frequency band, and be lower than the aforementioned first free vibration band system cause on the frequency band of intrinsic resonant frequency aforementioned second free oscillating system intrinsic resonance effect, thereby make in music playback that is applicable to the CD-ROM regenerating unit etc., the acceleration of aforementioned CD low speed rotation frequency band, bigger compared with the acceleration that only obtains by the aforementioned first free oscillation system, thereby at the aforementioned CD high speed rotating frequency band that is transmitted as purpose with data high-speed be applicable on the aforementioned CD low speed rotation frequency band of music playback etc., improve the tracking sensitivity of aforementioned luminous point to the displacement of aforementioned information recording channel.
Industrial applicability
Objective lens device of the present invention is as the disk record that reads rotary actuation with optical mode Drive unit in the light picker of the information of medium recording, that drive object lens is useful, and is special To be suitable for the regenerating unit such as CD-ROM, corresponding to 2 above recorded information transfer rates Optical information recording/reproducing device.
Claims (1)
1. objective lens device, comprise: the object lens holding member (2) that is wound with focusing coil (3) and tracking coil (4) on the periphery, be used to keep object lens (1), described focusing coil (3) is used for producing driving force on the focus direction parallel with the optical axis of described object lens (1), and described tracking coil (4) is used for producing driving force on the tracking direction vertical with optical axis;
4 first metal wires (61), one end are fixed on the described object lens holding member (2), and the other end is fixed on the relaying holding member (71);
4 second metal wires (62), one end are fixed on the described relaying holding member (71), and the other end is fixed on fixedly on the support (72); And
Between described focusing coil (3) and tracking coil (4), keep predetermined gap and be configured in flux circuit components (9,10) on the described fixedly support (72) relatively, supply with drive current by pass through described second metal wire (62), described relaying holding member (71), described first metal wire (61) and described object lens holding member (2) from described fixedly support (72) to described focusing coil (3) and tracking coil (4), and form the magnetic field that produces the Lorentz driving force;
Wherein, utilize the elastic deformation of described first metal wire (61) and support described object lens holding member (2) movably by described relaying holding member (71), utilize the elastic deformation of described second metal wire (62) and support described relaying holding member (71) movably by described fixedly support (72).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03558698A JP3757603B2 (en) | 1998-02-18 | 1998-02-18 | Objective lens drive |
| PCT/JP1999/004423 WO2001013368A1 (en) | 1998-02-18 | 1999-08-17 | Device for driving object lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1323437A CN1323437A (en) | 2001-11-21 |
| CN1154988C true CN1154988C (en) | 2004-06-23 |
Family
ID=26374572
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB998122661A Expired - Fee Related CN1154988C (en) | 1998-02-18 | 1999-08-17 | Device for driving object lens |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP3757603B2 (en) |
| CN (1) | CN1154988C (en) |
| WO (1) | WO2001013368A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6643073B1 (en) | 1998-02-18 | 2003-11-04 | Matsushita Electric Industrial Co., Ltd. | Device for driving object lens |
| JP3757603B2 (en) * | 1998-02-18 | 2006-03-22 | 松下電器産業株式会社 | Objective lens drive |
| KR100361498B1 (en) * | 2000-07-13 | 2002-11-18 | 엘지전자 주식회사 | Supporting structure of actuator for tilting drive |
| CN100382992C (en) * | 2004-06-02 | 2008-04-23 | 陈福礽 | Magnetic boot module |
| CN101017233A (en) * | 2006-02-08 | 2007-08-15 | 鑫视科技股份有限公司 | Camera lens module having parallel driving suspension device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0612578B2 (en) * | 1985-01-25 | 1994-02-16 | 株式会社日立製作所 | Optical scanning device |
| JPH03100934A (en) * | 1989-09-13 | 1991-04-25 | Mitsubishi Electric Corp | Objective lens driving device |
| JP3757603B2 (en) * | 1998-02-18 | 2006-03-22 | 松下電器産業株式会社 | Objective lens drive |
-
1998
- 1998-02-18 JP JP03558698A patent/JP3757603B2/en not_active Expired - Fee Related
-
1999
- 1999-08-17 WO PCT/JP1999/004423 patent/WO2001013368A1/en active IP Right Grant
- 1999-08-17 CN CNB998122661A patent/CN1154988C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| WO2001013368A1 (en) | 2001-02-22 |
| JP3757603B2 (en) | 2006-03-22 |
| CN1323437A (en) | 2001-11-21 |
| JPH11232671A (en) | 1999-08-27 |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |