CN1523590A - Optical pickup device being compatible with different recording medium - Google Patents
Optical pickup device being compatible with different recording medium Download PDFInfo
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- CN1523590A CN1523590A CNA031154840A CN03115484A CN1523590A CN 1523590 A CN1523590 A CN 1523590A CN A031154840 A CNA031154840 A CN A031154840A CN 03115484 A CN03115484 A CN 03115484A CN 1523590 A CN1523590 A CN 1523590A
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Abstract
The invention is the amplifying lens of light picking device which uses light to record and play, is the amplifying lens compatible to HD/DVD. The character lies in it includes following components: the aperture adjusting device for creating change by difference of wavelength of light house in HD/DVD; the lens group which are connected to the disk; driving above lens group, makes it correspondent to the lens driving device variable to the HD/DVD beam spot position. The aperture adjusting device is formed by short wave filter or it uses HD as the convergent beam, and uses DVD as the dispersing beam. The lens driving device adjust the distance between the amplifying lends and SIL lens, and the distance between SIL lens and disk.
Description
(1) technical field
The invention relates to the enlarging objective on the optical take-up apparatus that carries out optical recording and playback action, especially about the optical take-up apparatus of the mutually compatible usefulness of recording medium of different recording density.
(2) background technology
In order to increase the recording capacity of CD, the research and development through unremitting work out digital video disk (the Digital videoDisk that has bigger recording capacity than existing C D CD (compact Disk is hereinafter to be referred as CD); Hereinafter to be referred as DVD), and developing the CD (HD) and its driver that usefulness is play in the high density recording that can utilize existing C D to carry out high density (2 double density) record and play.DVD and CD are compared with not only recording density (track density) is dense, and the distance from the surface to information recording surface is also short.Therefore the optical take-up apparatus that is used for reading DVD is difficult in the action of the enterprising line item/played data of CD CD, this is because produce the spherical surface error that is caused by the variable in distance between optical disc surface and the data recording surface, and draws the COMA that is risen by the inclination of CD and count difference and caused by the non-point tolerance of demodulation action generation etc.
It is to allow the intensity of light beam mainboard of data medium relatively greater than the intensity of data medium with the string panel of exterior domain that sphere is counted difference, and produces the interference phenomenon between the information track.COMA counts the fluctuation of service that factors such as difference and non-point tolerance will cause optical instrument in addition, has finally reduced optical characteristics.These spherical surface errors (SA), COMA counts poor (CA) and non-point tolerance (DA) is variable in distance, refractive index, the aperture numerical value (NA) of enlarging objective, the demodulation amount that depends between optical disc surface and the data recording surface, the inclined degree of CD etc.
When but optical take-up apparatus can utilize the enlarging objective of different apertures numerical value (NA) to regulate the beam diameter of light source, can visit all CD and DVD.
Therefore can utilize two kinds of different enlarging objectives of aperture numerical value, propose a kind ofly on an enlarging objective, to adhere to the swp filter device, can visit the optical take-up apparatus of CD and DVD with this.
Fig. 1 is common (CD/DVD) compatible structural representation with optical take-up apparatus.
With reference to figure 1, we comprise following several parts with optical Pickup device at common as can be seen CD/DVD compatibility:
The one HPM (holographic photography pick-up module) 1 of output DVD laser, output CD the 2nd HPM (2) of laser, the light beam of an above-mentioned HPM (1) output is seen through and reflects the beam splitter 3 of the light beam of the 2nd HPM (2) output, to become the aiming object lens 4 of parallel beam from the Beam Transformation that above-mentioned beam splitter 3 passes through, reflect the parallel beam of above-mentioned aiming object lens 4 and the catoptron 5 of conversion light path, allow above-mentioned catoptron 5 beam reflected focus on more any enlarging objective 6a on the CD 7, adjust the swp filter device 6b of above-mentioned enlarging objective 6a aperture numerical value (NA).
Be converted into parallel beam from light beam transmitted beam splitter 3 backs of a HPM (1) output by aiming object lens 4, be converted into parallel beam by aiming object lens 4 equally after by beam splitter 3 reflections from the light beam of the 2nd HPM (2) output.The parallel beam that process aiming object lens 4 form is reflected, and (Half Mirror: the single plane fluoroscopy mirror) 5 convert light paths are for vertical for mirror, the light beam that is injected into enlarging objective 6a via catoptron 5 is by swp filter device 6b, therefore can form the CD/DVD share and access by the selective filter of 650nm (DVD) or 780nm (CD).So, need to consider the difference of NA and the methods such as gap of disk thickness (t) for the compatibility between CD and the DVD.
What particularly point out is, the HD enlarging objective that writes down and play for HD is because NA=0.85, λ=405nm, cover glass is t=0.01nm, DVD enlarging objective (NA=0.6, λ=650nm t=0.6nm) therefore needs the device that overcomes gap between above-mentioned NA, λ, the t for the compatibility between HD and the DVD.Be that the HD CD is that record/broadcast is 405nm with Wavelength of Laser, optical disc surface is 0.1t to the thickness of recording layer, and the aperture numerical value of enlarging objective is NA=0.85, and therefore the contrast difference is quite big.The wavelength of DVD CD is 650nm, thickness from optical disc surface to recording layer is 0.6t, the aperture numerical value NA=0.6 of enlarging objective, therefore use becomes to be applicable to that the enlarging objective (optical take-up apparatus) of HD dish comes the DVD playing back dish, just should allow to compensate because the spherical surface error of disk thickness difference and the problem that caused by the pigment difference of optical maser wavelength error etc.
(3) summary of the invention
The optical take-up apparatus that the purpose of this invention is to provide a kind of recording medium that can compatible different recording density.
The purpose of this invention is to provide the distance between a kind of adjustment enlarging objective and the SIL object lens (Solid Immersion Lens), and the distance between SIL object lens and the CD, can make HD/DVD compatible with this.
Utilize the optical take-up apparatus of the compatible enlarging objective of HD/DVD of the present invention, be characterized in comprising following parts:
Can allow beam diameter cause the aperture adjusting device of variation along with HD/DVD optical source wavelength difference;
Light beam by above-mentioned aperture adjusting device focuses on the objective lens on the CD;
Drive above-mentioned objective lens, make the objective lens device of its correspondence by the beam spot change in location of HD/DVD.
In addition, the compatible enlarging objective of HD/DVD of the present invention, its characteristics are that also above-mentioned aperture adjusting device comprises shortwave filtrator (SWPF).
In addition, the compatible enlarging objective of HD/DVD of the present invention, its characteristics are that also above-mentioned aperture adjusting device is to allow HD as convergent beam, makes DVD as divergent beams.
In addition, HD/DVD of the present invention is compatible uses enlarging objective, its characteristics to be that also above-mentioned objective lens also comprises enlarging objective and SIL object lens.
In addition, the compatible enlarging objective of HD/DVD of the present invention, its characteristics also are between above-mentioned enlarging objective and the SIL object lens to be by above-mentioned objective lens device adjusting at interval.
In addition, the compatible enlarging objective of HD/DVD of the present invention, its characteristics also are between above-mentioned SIL object lens and the CD to be to be regulated by above-mentioned objective lens device at interval.
For further specifying above-mentioned purpose of the present invention, design feature and effect, the present invention is described in detail below with reference to accompanying drawing.
(4) description of drawings
Figure 1 shows that the compatible structural representation of common CD/DVD with optical take-up apparatus.
Figure 2 shows that the compatible structural representation with enlarging objective of HD/DVD of the present invention, wherein Fig. 2 a is the situation when driving as the HD enlarging objective, and Fig. 2 b is the situation when driving with enlarging objective as DVD.
Fig. 3 be explanation in the specific embodiment of the invention emanator (DVD) and the sketch of condenser (HD).
(5) embodiment
Fig. 2 is the example of the used enlarging objective of compatible different recording medium of the present invention, has showed the compatible structural representation with enlarging objective of HD/DVD, and wherein Fig. 2 a is the situation of HD with enlarging objective work, and Fig. 2 b is the situation of DVD with enlarging objective work.
Be the HD/DVD compatibility, the SIL object lens 12 of having isolated certain distance with enlarging objective 11 form the enlarging objective group.The light beam Bhd, the Bdvd that are injected into enlarging objective 11 from light source are parallel beams, and SWPF (13) is positioned at enlarging objective 11 plane of incidence directions, and it act as the aperture adjusting device of compensation HD/DVD beam diameter difference.Enlarging objective 11 is 14,15 drivings of gearing detent of leaning on separately with SIL object lens 12.Above-mentioned gearing detent is such as utilizing voice coil loudspeaker voice coil (voice coil) etc.
If in the time of HD, as shown in Fig. 2 a, NA=0.85, λ=405nm, t=0.1nm, thus controlling and driving gearing detent 14,15 regulate between enlarging objective 11 and the SIL object lens 12 apart from a, and the interval b between SIL object lens 12 and the CD 16, can utilize beam diameter and the wavelength thereof of SWPF (13) with this with HD light beam Bdvd, allow its correspondence at HD with the speckle displacement on the CD 16.
If in the time of DVD, shown in Fig. 2 b, NA=0.6, λ=650nm, t=0.6nm, thus controlling and driving gearing detent 14,15 regulate between enlarging objective 11 and the SIL object lens 12 apart from a ', and the interval b ' between SIL object lens 12 and the CD 16, can utilize beam diameter and the wavelength thereof of SWPF (13) with this, can allow its correspondence use the speckle displacement that coils on the 16a at DVD DVD light beam Bdvd.
So use SWPF (13) to change the beam diameter of incident beam, can be with this by the variable in distance between SIL object lens 12 and the CD 16 is become a=a ', b=b ', guaranteeing the good optical error characteristics, and along with utilizing this function also can realize the compatibility of HD/DVD.Along with the interval between enlarging objective 11 and the SIL object lens 12, the number difference is also responsive in addition, and it is poor that therefore mobile SIL object lens 12 minimize number.
In addition, as another specific embodiment of the present invention, also can take to remove the structure of SWPF (13) into adjustment aperture.For this reason with the light beam Bdvd of DVD as divergent beams (with reference to figure 3a), be convergent beam (with reference to figure 3b) with HD light beam Bdvd.This moment, incident beam became identically, so just can remove above-mentioned SWPF (13), and the optical maser wavelength that is used in HD and DVD also can be used, and 405nm's is a kind of.
As other embodiment of the present invention, also can take to remove above-mentioned SWPF (13), fixedly between enlarging objective 11 and the SIL object lens 12 apart from a (gearing detent 14 is disengaged), DVD is as divergent beams, the structure that HD uses as convergent beam.This moment is because the incident beam diameter is identical, therefore SWPF (13) has lost its purposes, can also get rid of along with the distance between the object lens number difference responsive the time, utilize gearing detent 15 to adjust interval between the SIL object lens 12 error dishes, it is poor to minimize number with this.
The present invention provides the compatible enlarging objective of HD/DVD.HD/DVD compatible objective of the present invention is to embody high aperture numerical value (NA) easily, and optical characteristics is good, therefore can not only guarantee a lot of excellent characteristic, simultaneously, also can play in the compatible optical recording of HD/DVD is in the stream structure of optical instrument to be oversimplified more.
Though the present invention describes with reference to current specific embodiment, but those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, should understand and wherein can make variations and modifications and do not break away from the present invention in a broad sense, so be not as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claims of the present invention variation, the distortion of the above embodiment.
Claims (8)
1. the optical take-up apparatus of compatible different recording medium is characterized in that comprising with lower member:
In order to allow compatible optical recording of recording medium and the broadcast that has different recording density, the light focusing/imaging device of focal imaging on optical recording media;
Regulate the drive unit of distance between above-mentioned light focusing/imaging device and CD according to recording medium.
2. the optical take-up apparatus of compatible different recording medium as claimed in claim 1 is characterized in that,
Described light focusing/imaging device also comprises enlarging objective and SIL object lens,
Described drive unit also comprises the gearing detent that drives enlarging objective in order to regulate the distance between enlarging objective and SIL object lens, and in order to regulate the gearing detent that drives the SIL object lens between SIL object lens and the CD at interval.
3. the optical take-up apparatus of compatible different recording medium is characterized in that comprising as lower member:
The aperture adjusting device of preparing for the beam diameter by the wavelength difference of the used light source of recording medium of different recording density changes;
Light beam by above-mentioned aperture adjusting device focuses on the objective lens on the CD;
Drive above-mentioned objective lens, allow the drive unit of the beam spot change in location on its corresponding record medium.
4. the optical take-up apparatus of compatible different recording medium as claimed in claim 3 is characterized in that, above-mentioned aperture adjusting device comprises the shortwave filtrator.
5. the optical take-up apparatus of compatible different recording medium as claimed in claim 3 is characterized in that, the HD of above-mentioned aperture adjusting device as convergent beam, DVD as divergent beams.
6. the optical take-up apparatus of compatible different recording medium as claimed in claim 3 is characterized in that, above-mentioned objective lens comprises enlarging objective and SIL object lens.
7. the optical take-up apparatus of compatible different recording medium as claimed in claim 6 is characterized in that, the spacing between above-mentioned enlarging objective and the SIL object lens is to be regulated by described objective lens device.
8. the optical take-up apparatus of compatible different recording medium as claimed in claim 6 is characterized in that, the spacing between above-mentioned SIL object lens and the CD is to be regulated by described objective lens device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031154840A CN1523590A (en) | 2003-02-21 | 2003-02-21 | Optical pickup device being compatible with different recording medium |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031154840A CN1523590A (en) | 2003-02-21 | 2003-02-21 | Optical pickup device being compatible with different recording medium |
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| CN1523590A true CN1523590A (en) | 2004-08-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA031154840A Pending CN1523590A (en) | 2003-02-21 | 2003-02-21 | Optical pickup device being compatible with different recording medium |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105142015A (en) * | 2015-09-19 | 2015-12-09 | 北京暴风科技股份有限公司 | Method of sharing and playing BHD file based on DLNA |
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2003
- 2003-02-21 CN CNA031154840A patent/CN1523590A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105142015A (en) * | 2015-09-19 | 2015-12-09 | 北京暴风科技股份有限公司 | Method of sharing and playing BHD file based on DLNA |
| CN105142015B (en) * | 2015-09-19 | 2018-10-09 | 暴风集团股份有限公司 | A method of based on the shared broadcasting BHD files of DLNA |
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