CN100416674C - Optical reader and its optical pick-up head - Google Patents
Optical reader and its optical pick-up head Download PDFInfo
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- CN100416674C CN100416674C CNB2005100630098A CN200510063009A CN100416674C CN 100416674 C CN100416674 C CN 100416674C CN B2005100630098 A CNB2005100630098 A CN B2005100630098A CN 200510063009 A CN200510063009 A CN 200510063009A CN 100416674 C CN100416674 C CN 100416674C
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Abstract
The present invention relates to an optical reader and an optical read head thereof. The optical read head is used for reading a penetration type or a reflection type optical information storage medium, and comprises a light source, a spectroscope, a first objective lens, a wave plate, a second objective lens, a penetration optical image detection unit and a reflection optical image detection unit, wherein the light source emits an incident light beam of which a part penetrates through the spectroscope. The first objective lens focuses the incident light beam on the penetration type or the reflection type optical information storage medium. The incident light beam penetrates through the penetration type optical information storage medium to form a penetration light beam; the incident light beam reflects from the reflection type optical information storage medium to form a reflection light beam. The wave plate is arranged between the spectroscope and the first objective lens and has mobility. The second objective lens focuses the penetration light beam. The penetration optical image detection unit is used for receiving the penetration light beam focused by the second objective lens and converting the penetration light beam into an electrical signal. The reflection optical image detection unit is used for receiving the reflection light beam reflected by the spectroscope and converting the reflection light beam into an electrical signal.
Description
Technical field
The present invention relates to a kind of optical read head, particularly relate to and a kind ofly can be used in optical pickup device and the optical read head thereof that reads penetrating type light data storage medium and reflection type optical data storage medium.
Background technology
Along with the arriving of data and multimedia era, the consumer increases sharp for the demand of Storage Media capacity.Wherein,, and have portability and characteristic that can storing data permanently, make that utilizing the light data storage medium to come access data has been the mode of quite popularizing because the light data storage medium can store lot of data.
Common now light data storage medium comprises laser disc (CD, Compact Disc) and digital audio-video laser disc (DVD, Digital Versatile Disc), both structures include a recording layer and a reflection horizon, recording layer is to utilize the record groove to come record data, when an optical read device is carried out reading of data, optical read device is that emission one laser focusing is in recording layer, the reflection horizon of light data storage medium then provides returns laser-bounce to one in the optical read device as detecting element (photodetector), but finishes reading of data with the electric signal that laser is converted to the identification processing.
From the above, known light data storage medium is to utilize the record groove of laser radiation in recording layer, the strong and weak degree that is reflected by laser different and transfer to know 0,1 signal, yet, with regard to above-mentioned by reflector laser to obtain the mechanism of light data storage medium data, because laser light reflected is extremely as several layers of structure that need on the path of detecting element through the light data storage medium, and the laser by several layers of medium can be absorbed and then cause and reads the interpretation that signal weaker has influenced data, thereby, in order to ensure obtaining the preferable signal that reads, be to improve with the power that improves emission laser, yet this measure can reduce the serviceable life of the optical read head of emission laser again under long-term the use, therefore, light data storage medium dealer is devoted to research and develop the light data storage medium that need not utilize the mechanism of laser-bounce and can get data, for instance, can change by the material of the recording layer of light data storage medium, in order to for example mode that reads of penetration, come modulation laser to reach the purpose of 0 and 1 signal.
In view of this, for complying with the research and development that the above-mentioned mechanism that need not utilize laser-bounce can get the penetrating type light data storage medium of data, corresponding optical read device and optical read head are wherein also complied with simultaneously and are given birth to, yet, it is different owing to reading mechanism with known reflection type optical data storage medium to read penetrating type light data storage medium, the design of optical read head is also different, and how therefore a kind of optical pickup device and optical read head thereof that can read the light data storage medium of penetrating type and reflection-type simultaneously be provided is one of important topic of optical pickup device dealer now in fact.
This shows that above-mentioned existing optical pickup device and optical read head thereof obviously still have inconvenience and defective, and demand urgently further being improved in structure and use.In order to solve the problem that optical pickup device and optical read head thereof exist, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, but do not see always that for a long time suitable design finished by development, and common product does not have suitable structure to address the above problem, and this obviously is the problem that the anxious desire of relevant dealer solves.
Because the defective that above-mentioned existing optical pickup device and optical read head thereof exist, the inventor is based on being engaged in this type of product design manufacturing abundant for many years practical experience and professional knowledge, and the utilization of cooperation scientific principle, actively studied innovation, in the hope of optical pickup device and the optical read head thereof of founding a kind of new structure, can improve general existing optical pickup device and optical read head thereof, make it have more practicality.Through constantly research, design, and after studying sample and improvement repeatedly, create the present invention who has practical value finally.
Summary of the invention
The objective of the invention is to, overcome the defective that existing optical pickup device and optical read head thereof exist, and provide a kind of optical pickup device and optical read head thereof of new structure, technical matters to be solved is it can be used in read penetrating type light data storage medium and reflection type optical data storage medium, thereby is suitable for practicality more.
Therefore, for reaching above-mentioned purpose, according to a kind of optical read head of the present invention, it is in order to reading a penetrating type light data storage medium or a reflection type optical data storage medium, and optical read head comprises that a light source, a spectroscope, one first object lens, a ripple plate, one second object lens, penetrate that light image detects the unit and a reflected light looks like to detect the unit.Wherein, light source is emission one incident beam; The incident beam of part is to penetrate spectroscope; The first object lens focusing incident beam is in penetrating type light data storage medium or reflection type optical data storage medium, incident beam penetrated penetrating type light data storage medium and formed a transmitted beam, and the incident beam reflection forms a folded light beam from the reflection type optical data storage medium; The ripple plate is to be arranged between the spectroscope and first object lens, and has movability; Second object lens are to focus on transmitted beam; Penetrating light image, to detect the unit be to receive the transmitted beam of second object lens focusing and transmitted beam is converted to an electric signal that corresponds to data-signal; It is the folded light beam that receives by the spectroscope reflection that reflected light looks like to detect the unit, and folded light beam is converted to an electric signal that corresponds to data-signal.
For achieving the above object, according to a kind of optical pickup device of the present invention, it is in order to reading a penetrating type light data storage medium or a reflection type optical data storage medium, and optical pickup device comprises an optical read head, a control module and a signal processing unit.Wherein, optical read head comprises a light source, one spectroscope, one first object lens, one ripple plate, one second object lens, one penetrates that light image detects the unit and a reflected light looks like to detect the unit, light source is emission one incident beam, the incident beam of part is to penetrate spectroscope, first object lens are to be focused into irradiating light beam in penetrating type light data storage medium or reflection type optical data storage medium, incident beam penetrated penetrating type light data storage medium and formed a transmitted beam, the incident beam reflection forms a folded light beam from the reflection type optical data storage medium, the ripple plate is to be arranged between the spectroscope and first object lens, and has movability, second object lens are to focus on a transmitted beam that penetrated penetrating type light data storage medium, penetrating light image, to detect the unit be to receive the transmitted beam of second object lens focusing and transmitted beam is converted to an electric signal that corresponds to data-signal, it is the folded light beam that receives by the spectroscope reflection that reflected light looks like to detect the unit, and folded light beam is converted to an electric signal that corresponds to data-signal; Control module changes the relative position of optical read head and penetrating type light data storage medium or reflection type optical data storage medium; The electric signal that the signal processing unit processes optical read head spreads out of is to obtain the data of penetrating type light data storage medium or reflection type optical data storage medium.
For achieving the above object, according to a kind of optical read head of the present invention, it is in order to reading a penetrating type light data storage medium and a reflection type optical data storage medium, and optical read head comprises that a light source, penetrates that light image detects the unit, a reflected light looks like to detect a unit and an optical unit.Wherein, light emitted one incident beam; Penetrating light image and detect the unit and receive the light beam penetrated penetrating type light data storage medium, is one to correspond to the electric signal of data-signal with Beam Transformation; Reflected light looks like to detect the unit and receives the light beam of reflection from the reflection type optical data storage medium, is one to correspond to the electric signal of data-signal with Beam Transformation; Optical unit is to be guided into irradiating light beam light image detects the unit and reflected light looks like to detect the unit to penetrating.
From the above, because of foundation optical pickup device of the present invention and optical read head thereof, optical read head is to read the reflection-type or the light beam of penetrating type light data storage medium by dividing other to look like to detect unit (photodetector) reception, reach the purpose that can be used to read two kinds of dissimilar light data storage mediums (for example reflection type optical data storage medium and penetrating type light data storage medium) simultaneously, when when reading the reflection type optical data storage medium, incident beam focuses on the reflection type optical data storage medium through spectroscope and ripple plate in regular turn, and reflection produces a folded light beam and reflexes to reflected light by spectroscope and look like to detect the unit, and when when reading penetrating type light data storage medium, incident beam is through spectroscope and focus on penetrating type light data storage medium, and generation one transmitted beam that penetrates detects the unit reception by penetrating light image, because the ripple plate has movability, therefore can be according to the type that reads the light data storage medium, whether change the polarity of incident beam in order to decision, with this optical read head arrange in pairs or groups a control module and a signal processing unit, in order to change optical read head and light data storage medium relative position and to handle the electric signal that optical read head spreads out of, formation one can be read the optical pickup device of the light data storage medium of above-mentioned penetrating type or reflection-type respectively.
The present invention compared with prior art has tangible advantage and beneficial effect.By technique scheme, optical pickup device of the present invention and optical read head thereof have following advantage at least:
Optical pickup device and optical read head thereof according to preferred embodiment of the present invention, optical read head is to detect the light beam that dissimilar light data storage mediums (reflection-type and penetrating type light data storage medium) read in unit (photodetector) reception by dividing other to look like, and be converted into recognizable electric signal to finish the step of reading of data, this optical read head is applied to optical pickup device, change the electric signal that optical read head and light data storage medium relative position and signal processing unit processes optical read head spread out of by control module, and finish obtaining of light data storage medium data.Wherein, when reading the reflection type optical data storage medium, incident beam focuses on the reflection type optical data storage medium through spectroscope and ripple plate in regular turn, and reflection generation one folded light beam is directed to reflected light by spectroscope and looks like to detect the unit; When reading penetrating type light data storage medium, incident beam is through spectroscope and focus on penetrating type light data storage medium, and generation one transmitted beam that penetrates detects the unit reception by penetrating light image, again, the ripple plate has movability, therefore can in order to determine whether to change the polarity of incident beam, in an optical pickup device, read the purpose that difference reads the light data storage medium of mechanism according to the type that reads the light data storage medium to reach.
In sum, the optical pickup device of special construction of the present invention and optical read head thereof, it has above-mentioned many advantages and practical value, and in same device and product, do not see have similar structural design to publish or use and really genus innovation, no matter it all has bigger improvement on device and the structure of product or function, have large improvement technically, and produced handy and practical effect, and more existing optical pickup device and optical read head thereof have the multinomial effect of enhancement, thereby be suitable for practicality more, and have the extensive value of industry, really be a novelty, progressive, practical new design.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of instructions, and for above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, below especially exemplified by preferred embodiment, and conjunction with figs., be described in detail as follows.
Description of drawings
Fig. 1 and Fig. 2 are for showing one group of synoptic diagram according to the optical read head of preferred embodiment of the present invention.
Fig. 3 is the synoptic diagram of a demonstration according to the optical read head of another preferred embodiment of the present invention.
Fig. 4 is the synoptic diagram of a demonstration according to the optical pickup device of preferred embodiment of the present invention.
Fig. 5 and Fig. 6 are for showing one group of synoptic diagram of the optical read head of a preferred embodiment again according to the present invention.
1: optical pickup device 10: optical read head
11: light source 12: spectroscope
15: penetrate light image and detect unit 151: polarization element
152: 16: the second object lens of detecing element
17: reflected light looks like to detect unit 18: collimation lens
201: recording layer 30: the reflection type optical data storage medium
40: signal processing unit 50: optical read head
51: light source 52: penetrate light image and detect the unit
521: polarization element 522: detecing element
53: reflected light looks like to detect unit 54: optical unit
55: ripple plate 56: object lens
60: control module 601: motor
602: driving element
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, to optical pickup device and its embodiment of optical read head, structure, feature and the effect thereof that foundation the present invention proposes, describe in detail as after.
Hereinafter with reference to correlative type, optical pickup device and optical read head thereof according to preferred embodiment of the present invention are described, wherein components identical will be illustrated with identical reference marks.
See also Fig. 1 and shown in Figure 2, comprise that according to the optical read head 10 of preferred embodiment of the present invention a light source 11, a spectroscope 12, one first object lens 13, a ripple plate 14, one second object lens 16, penetrate that light image detects unit 15 and a reflected light looks like to detect unit 17, this optical read head 10 is in order to read a penetrating type light data storage medium 20 or a reflection type optical data storage medium 30.
The incident beam of part is to penetrate spectroscope 12, and the incident beam polar biased can be turned to a linearly polarized light (linearly polar ized light) simultaneously.
See also shown in Figure 1ly, the transmitted beam that has the data message is by second object lens 16, detects unit 15 and receives and penetrate light by penetrating light image at last, and be converted into the electric signal of corresponding data-signal; As shown in Figure 2, reflection is after the folded light beam of reflection type optical data storage medium 30 is to pass through first object lens 13 and ripple plate 14 once more, looking like to detect unit 17 via a part of folded light beam to the reflected light of spectroscope 12 reflections receives, and being converted into the electric signal of corresponding data-signal, above-mentioned electric signal is in order to obtain the record data of light data storage medium.
From the above, penetrating light image detects unit 15 and comprises a polarization element 151 and a detecing element 152, polarization element 151 is to be arranged to penetrate on the light path and be positioned at before the detecing element 152, polarization element 151 receives the transmitted beam that has data-signal, and go out the intensity of a certain vector of light wave respectively, but be the electric signal that an identification is handled via detecing element 152 by the different switching of light intensity again, in order to finish reading of data.
Again, see also shown in Figure 3ly, comprise more that according to the optical read head 10 of preferred embodiment of the present invention collimation lens 18 (Collimator lens) are arranged between light source 11 and the spectroscope 12, in order to being a parallel beam light source 11 emitted light beams parallel processing.
Moreover optical read head 10 comprises that more one the 3rd object lens 19 are arranged between polarization element 151 and the detecing element 152, focuses on the detecing element 152 in order to the light beam after polarization element 151 is analyzed.
See also shown in Figure 4, optical pickup device 1 according to preferred embodiment of the present invention comprises an optical read head 10, a control module 60 and a signal processing unit 40, and this optical pickup device 1 is in order to read a penetrating type light data storage medium 20 or a reflection type optical data storage medium 30.
The structure of optical read head 10 is aforesaid application, so do not repeat them here.
60 of control modules are in order to change optical read head 10 and the light data storage medium (relative position of penetrating type light data storage medium 20 or reflection type optical data storage medium 30, focus on and follow the position control of rail, control module 60 can comprise a motor 601 and a driving element 602, motor 601 is in order to rotation light data storage medium, and driving element 602 is in order to mobile optical read head 10.
40 of signal processing units can comprise a circuit board, in order to handle electric signal that optical read head 10 spreads out of to obtain the data of light data storage medium.
For content of the present invention is more readily understood, below see also Fig. 1 and shown in Figure 2, with the embodiment of explanation according to the optical pickup device 1 and the optical read head 10 thereof of preferred embodiment of the present invention.
See also shown in Figure 1, when desiring to read penetrating type light data storage medium 20, incident beam produces parallel beam and enters spectroscope 12 via collimation lens 18, by spectroscope 12 the incident beam polar biased is turned to a linearly polarized light (linearly polarized light), focusing on penetrating type light data storage medium 20 by first object lens 13 again forms one and reads luminous point, 201 pairs of incident beams of recording layer by penetrating type light data storage medium 20 are made modulation, for example recording layer 201 can comprise an optically active substance, make the plane of oscillation of the light of incident beam rotate an angle, and penetrated penetrating type light data storage medium 20 and form a transmitted beam and detect unit 15 and receive by penetrating light image by second object lens 16, and the light beam that conversion has data is an electric signal.
See also shown in Figure 2, when reading reflection type optical data storage medium 30, ripple plate 14 is to be moved on the path of incident beam by a selector switch, incident beam produces parallel beam and enters spectroscope 12 via collimation lens 18, by spectroscope 12 the incident beam polar biased is turned to a linearly polarized light, this linearly polarized light produces circularly polarized light via ripple plate 14, and focus on reflection type optical data storage medium 30 via first object lens 13 and form one and read luminous point, then be reflected into irradiating light beam and produce a folded light beam by reflection type optical data storage medium 30, this folded light beam is more in regular turn via first object lens 13 and ripple plate 14, and being looked like to detect unit 17 and converted to the light beam that has data by a part of folded light beam to the reflected light of spectroscope 12 reflections at last is electric signal.
Again, as described in Fig. 5 and Fig. 6, optical read head 50 according to another preferred embodiment of the present invention, be in order to reading a penetrating type light data storage medium 20 and a reflection type optical data storage medium 30, optical read head 50 comprises that a light source 51, penetrates that light image detects unit 52, a reflected light looks like to detect a unit 53 and an optical unit 54.
Penetrating light image, to detect unit 52 be to receive the light beam penetrated penetrating type light data storage medium 20, and be the electric signal that corresponds to data-signal with this Beam Transformation; It is to receive the light beam of reflection from reflection type optical data storage medium 30 that reflected light looks like to detect unit 53, and is the electric signal that corresponds to data-signal with this Beam Transformation.Wherein, penetrate light image and detect unit 52 and comprise a polarization element 521 and a detecing element 522, polarization element 521 is to be arranged on the path of transmitted beam and to be positioned at before the detecing element 522.
In the present embodiment, optical read head 50 more comprises a ripple plate 55 and has movability, when reading reflection type optical data storage medium 30, ripple plate 55 is to be positioned on the path of incident beam (as shown in Figure 6), and when reading penetrating type light data storage medium 20, ripple plate 55 is paths (as shown in Figure 5) of leaving incident beam.Wherein, ripple plate 55 is to can be 1/4 ripple plate, in order to change the polarity of incident beam.
Again, from the above, the optical read head 50 of present embodiment more comprises object lens 56, is incident beam is focused on penetrating type light data storage medium 20 and reflection type optical data storage medium 30.Again, according to actual needs, the numerical aperture of object lens 56 can select to be about 0.60 or 0.40 to 0.50, and as mentioned above, the numerical aperture of object lens 56 is not limited thereto.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the structure that can utilize above-mentioned announcement and technology contents are made a little change or be modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solution of the present invention, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (12)
1. optical read head, it is in order to reading a penetrating type light data storage medium or a reflection type optical data storage medium, it is characterized in that this optical read head comprises:
One light source, it is emission one incident beam;
One spectroscope, this incident beam of part is to penetrate this spectroscope;
One first object lens, it is to focus on this incident beam in this penetrating type light data storage medium or this reflection type optical data storage medium, this incident beam penetrated this penetrating type light data storage medium and formed a transmitted beam, and this incident beam reflection forms a folded light beam from this reflection type optical data storage medium;
One ripple plate, it is to be arranged between this spectroscope and this first object lens, when reading the reflection type optical data storage medium, this ripple plate is to be positioned on the path of this incident beam, when reading penetrating type light data storage medium, this ripple plate is the path of leaving this incident beam, and this ripple plate is to have movability;
One second object lens;
One penetrates light image detects the unit, and it is to receive the transmitted beam by these second object lens and this transmitted beam is converted to an electric signal that corresponds to data-signal; And
One reflected light looks like to detect the unit, and it is this folded light beam that receives by this spectroscope reflection, and this folded light beam is converted to an electric signal that corresponds to data-signal.
2. optical read head according to claim 1 is characterized in that it more comprises collimation lens, is arranged between this light source and this spectroscope.
3. optical read head according to claim 1 is characterized in that the wherein said light image that penetrates detects the unit and comprises a polarization element and a detecing element, and this polarization element is to be arranged at this to penetrate on the light path and be positioned at before this detecing element.
4. optical read head according to claim 3 is characterized in that it more comprises one the 3rd object lens, is arranged between this polarization element and this detecing element.
5. optical read head according to claim 1, the numerical aperture that it is characterized in that wherein said first object lens is 0.6.
6. optical read head according to claim 1, the numerical aperture that it is characterized in that wherein said first object lens is 0.40 to 0.50.
7. optical pickup device, it is in order to reading a penetrating type light data storage medium or a reflection type optical data storage medium, it is characterized in that this optical pickup device comprises:
One optical read head, it comprises a light source, one spectroscope, one first object lens, one ripple plate, one second object lens, one penetrates that light image detects the unit and a reflected light looks like to detect the unit, wherein this light source is emission one incident beam, this incident beam of part is to penetrate this spectroscope, these first object lens are to focus on this incident beam in this penetrating type light data storage medium or this reflection type optical data storage medium, this incident beam penetrated this penetrating type light data storage medium and formed a transmitted beam, this incident beam reflection forms a folded light beam from this reflection type optical data storage medium, this ripple plate is to be arranged between this spectroscope and this first object lens, when reading the reflection type optical data storage medium, this ripple plate is to be positioned on the path of this incident beam, when reading penetrating type light data storage medium, this ripple plate is the path of leaving this incident beam, and this ripple plate is to have movability, this penetrates light image, and to detect the unit be to receive the transmitted beam by these second object lens and this transmitted beam is converted to an electric signal that corresponds to data-signal, it is this folded light beam that receives by this spectroscope reflection that this reflected light looks like to detect the unit, and this folded light beam is converted to an electric signal that corresponds to data-signal;
One control module, it is the relative position that changes this optical read head and this penetrating type light data storage medium or this reflection type optical data storage medium; And
One signal processing unit, it is to handle electric signal that this optical read head spreads out of to obtain the data of this penetrating type light data storage medium or this reflection type optical data storage medium.
8. optical pickup device according to claim 7 is characterized in that it more comprises:
One collimation lens, it is to be arranged between this light source and this spectroscope.
9. optical pickup device according to claim 7 is characterized in that wherein saidly penetrating light image to detect the unit being to comprise a polarization element and a detecing element, and this polarization element is to be arranged at this to penetrate on the light path and be positioned at before this detecing element.
10. optical pickup device according to claim 9 is characterized in that it more comprises:
One the 3rd object lens, it is to be arranged between this polarization element and this detecing element.
11. optical pickup device according to claim 7, the numerical aperture that it is characterized in that wherein said first object lens is 0.6.
12. optical pickup device according to claim 7, the numerical aperture that it is characterized in that wherein said first object lens is 0.40 to 0.50.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100630098A CN100416674C (en) | 2005-04-01 | 2005-04-01 | Optical reader and its optical pick-up head |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100630098A CN100416674C (en) | 2005-04-01 | 2005-04-01 | Optical reader and its optical pick-up head |
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| CN1841529A CN1841529A (en) | 2006-10-04 |
| CN100416674C true CN100416674C (en) | 2008-09-03 |
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| CN101408927B (en) * | 2007-10-10 | 2010-07-07 | 凌阳多媒体股份有限公司 | Optical reading head with diffuseness structure |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003263771A (en) * | 2002-03-07 | 2003-09-19 | Ricoh Co Ltd | Information recording/reproducing device and phase transition amorphous mark observation device |
| US6633531B1 (en) * | 1999-08-10 | 2003-10-14 | Kabushiki Kaisha Toshiba | Optical disk drive |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6633531B1 (en) * | 1999-08-10 | 2003-10-14 | Kabushiki Kaisha Toshiba | Optical disk drive |
| JP2003263771A (en) * | 2002-03-07 | 2003-09-19 | Ricoh Co Ltd | Information recording/reproducing device and phase transition amorphous mark observation device |
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| CN1841529A (en) | 2006-10-04 |
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