CN1519831A - Light picking up device compatible to HD/DVD - Google Patents
Light picking up device compatible to HD/DVD Download PDFInfo
- Publication number
- CN1519831A CN1519831A CNA031150128A CN03115012A CN1519831A CN 1519831 A CN1519831 A CN 1519831A CN A031150128 A CNA031150128 A CN A031150128A CN 03115012 A CN03115012 A CN 03115012A CN 1519831 A CN1519831 A CN 1519831A
- Authority
- CN
- China
- Prior art keywords
- dvd
- light
- phase
- thing lens
- compatible
- 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.)
- Pending
Links
Images
Landscapes
- Optical Head (AREA)
Abstract
The invention overcomes difference in wavelength, number of opening and thickness of recording layer of HD/DVD. Thus, HD/DVD optical disk can be recorded and played through compatible focusing device in optical recording/playing device. The invention adds phase plate to DVD optical instrument so that enlarging objective of HD optical disk can be used in DVD for compatible recording and playing. In order to play DVD disk by using HD enlarging objective, aberration generated by using HD enlarging objective to play DVD optical disk is reduced since DVD optical instrument constitutes a limited optical instrument. Said phase plate is located on path DVD light passes through. Most ideal position of the phase plate is between light source and enlarging objective.
Description
(1) technical field
The present invention relates to the light picker of the compatible usefulness of a kind of HD (CD of high density recording/broadcast usefulness)/DVD.
(2) background technology
In order to increase the recording capacity of CD, people's development research constantly it, develop the DIGITAL YIDEO DISK (hereinafter to be referred as DVD) bigger than existing COMPACT DISK (hereinafter to be referred as CD) recording capacity, and can record/broadcast than the CD (HD) and the driver of the high density recording/broadcast usefulness of the more highdensity data of DVD.DVD to grab track density (being track density) denser than CD, and the surface of CD is also short to the distance of record surface, goes up record/played data so the light picker that DVD uses is difficult in CD.This is that the non-point tolerance that COMA error that the inclination of CD causes and demodulation cause is a cause because the surface of CD and the spherical surface error that the variable in distance between the data recording surface causes take place.
Spherical surface error makes with the strength ratio of the light beam mainboard in the data medium field intensity with field string panel beyond the data medium and reduces relatively, produces the interference phenomenon between the data-track.Outside COMA error and non-point tolerance etc. the optical effect of optical instrument is reduced.These spherical surface errors (SA), COMA error (CA) and non-point tolerance (AS) depend on the surface on the CD and the variation of the distance between the data recording surface (t), and refractive index is amplified the opening number (NA) of thing lens, demodulation amount, the inclined degree of CD etc.
But light picker can utilize the amplification thing lens of different openings number, can visit CD and DVD when regulating the beam diameter that starts from light source.
So can utilize 2 kinds of the different openings number to amplify the thing lens.But adhere to the swp filter device on amplification thing lens, the light picker of visiting all CD and DVD is just in motion.
Fig. 1 shows the formation situation of general CD/DVD dual-purpose light picker, comprising:
The one HPM (holographic photography pick-up module) 1 of output DVD laser;
Output CD the 2nd HPM2 of laser;
The light beam of above-mentioned HPM1 output is seen through, make the beam splitter 3 of the beam reflection of the 2nd HPM2 output;
Make by above-mentioned beam splitter 3 via light beam become the aiming thing lens 4 of parallel beam;
Change the catoptron 5 of the parallel beam light path that sees through above-mentioned aiming thing lens 4;
The light beam that above-mentioned catoptron 5 is reflected focuses on the more any amplification thing lens 6a on the CD 7;
Regulate the swp filter device 6b of the opening number (NA) of above-mentioned amplification thing lens 6a.
Light beam by HPM1 output is that transmitted beam splitter 3 quilt aiming thing lens 4 reflect into parallel beam, and the light beam of being exported by the 2nd HPM2 is become parallel beam by beam splitter 3 reflection backs through aiming thing lens 4.Parallel beam by aiming thing lens 4 mirror (HALF MIRROR) 5 that is reflected, light path becomes vertically, sees through via the light beam of catoptron 5 and amplifies thing lens 6a and focus on the CD a bit.At this moment be mapped to the light beam that amplifies thing lens 6a via catoptron 5 and pass through swp filter device 6b, the selective filter wavelength X, example: 650nm (DVD) and 780nm (CD) are to finish the share and access of CD/DVD.For the compatibility of CD and DVD, need to consider difference, the difference of wavelength X and the difference of CD of NA.
Particularly HD record or play for the HD of purpose when amplifying the thing lens: NA=0.85, λ=405nm, cover glass t=0.1mm; And DVD uses when amplifying the thing lens: NA=0.6, λ=650nm, t=0.6mm.So,, need can overcome above-mentioned NA, λ, the device of t difference for the compatibility of HD and DVD.Record/broadcast is 405nm with the wavelength of laser beam when being the HD CD, optical disc surface is 0.1mm to the thickness t of recording layer, the opening number that amplifies the thing lens is that NA=0.85 is big relatively, optical maser wavelength is λ=650nm during the DVD CD, optical disc surface is 0.6mm to the thickness t of recording layer, and the opening number that amplifies the thing lens is NA=0.6.Therefore, for amplification thing lens 9 light pickers that use at the HD CD) the DVD playing back CD, will compensate the chromatic number error that spherical surface error that disk thickness difference causes and optical maser wavelength difference cause.
(3) summary of the invention
The light picker that the purpose of this invention is to provide the compatible usefulness of a kind of HD/DVD, particularly the present invention will overcome the wavelength of HD/DVD CD, opening number, the difference of recording layer thickness provides the HD/DVD CD all with the light picker of realizing the HD/DVD compatibility on the optical recording/playing device.
The object of the present invention is achieved like this:
The light picker of the compatible usefulness of a kind of HD/DVD, the light that penetrates from light source are exaggerated the thing lens and gather CD with SIL thing lens and become phase, and wherein, described light picker also comprises on via the path at the light that becomes phase:
The phase compensation device: hold and cut down HD and DVD spherical surface error, phase characteristics is-f;
When described phase compensation device shows described spherical surface error with the position phase morphology, utilize the periodicity corrugated characteristic that takes place with wavelength, to cut down the phase board formation that phasic difference is a characteristic.
Above-mentioned phase board is positioned on the path of DVD light among the present invention, and the optimum position is at light source and amplifies between the thing lens.
The present invention is for compatible optical recording of HD/DVD and broadcast, light beam is accumulated in become phase on the optical recording media, is included in phase characteristics f-(λ, the light picker of phase compensation device r) of cutting down the spherical surface error f of HD and DVD on the light path of optical instrument.
Above-mentioned phase characteristics is a wavelength X, the function of the refractive index r of thing lens, and utilization embodies the light picker of HD and DVD compatibility along with the characteristic on the corrugated of wavelength generating period is cut down HD and DVD phasic difference separately.
Effect of the present invention:
The light picker of the compatible usefulness of HD/DVD provided by the invention meets on the optical instrument basis of HD design, only increases phase board and guarantees compatibility with the DVD dish, and is of the present invention easy to make.
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
Fig. 1 is the light picker figure of existing C D/DVD dual-purpose;
Fig. 2 is the structural drawing of the light picker of the compatible usefulness of HD/DVD of the present invention;
The a of Fig. 3, b, c is for being used to illustrate the curve map that error is presented as the phasic difference form of phase board of the present invention.
(5) embodiment
Fig. 2 is that the light picker of explanation HD and the compatible usefulness of DVD is the amplification thing lens arrangement figure of purpose, does not have illustrated element all identical with existing light picker among this figure.
15 light is got involved phase board 16 via the path from light source 11 to CD, and it is the most suitable to be positioned at the front end that amplifies thing lens 13.The optics phase characteristics of above-mentioned phase board 16 is to consider the corrugated, is handled by the membrane on the concentric circles and realizes.
The amplification thing lens that above-mentioned phase board 16 utilizes HD to use make the DVD dvd playback, hold the characteristic that execute bit guarantees mutually, and to this, please refer to Fig. 2 has more detailed description.
As previously described, using the amplification thing lens that meet the NA=0.85 that t designs as the HD CD of 0.1mm, is that the DVD CD of 0.6mm condenses on the record surface of CD the focus of using up to aim at demodulation in order to play t.This moment is very short because of the driving distance of amplifying the thing lens, so the light picker main beam optical instrument that is made of unlimited optical instrument (fan diffuser) is made of limited optical instrument (collector).Promptly as shown in Figure 2,15 optical instrument is made of limited optical instrument (collector) from light source 11 to CD.So use disk thickness poor according to HD with CD and DVD under the situation, will very big spherical surface error take place.
The a of Fig. 3 is when being made of limited optical instrument under the situation of DVD, promptly utilizes when amplifying the limited optical instrument DVD playing back of thing lens, and the spherical surface error form that is caused by disk thickness shows as the figure of a phase morphology.Y-axis is the ratio of wavelength X among Fig. 3 a, and X-axis is the refractive index r of beginning and thing lens center.
Shown in Fig. 3 a, the position phase morphology according to the disk thickness difference embodies the corrugated characteristic with the wavelength X generating period.When therefore utilizing this characteristic, the curve map shown in Fig. 3 a and Fig. 3 b equivalence.That is, because corrugated characteristic with the wavelength generating period is arranged, be the definite value REF of institute benchmark, with the characteristic of Fig. 3 a, be+0.5 λ scope from-0.5 λBian Huan.The actual form that becomes Fig. 3 b for phase missionary society.Therefore being used in the light picker that meets HD most and make comes the DVD playing back CD, holds as the position of Fig. 3 b and form light beam on CD, and this position promptly embodies error mutually.
Therefore the phase characteristics of compensation image 3b utilizes the light picker that meets HD most, can realize the DVD playing back CD.Used phase board 16 for this reason.The phase characteristics of result bits phase-plate 16 is in order to compensate the phase characteristics of (reduction) above-mentioned Fig. 3 b, holds and the position of Fig. 3 b phase characteristics of Fig. 3 c of opposite characteristic mutually.So can utilize the light picker that meets HD most, during the DVD playing back CD, also with the characteristic of Fig. 3 c, compensatory light is to amplifying thing lens 13, SIL thing lens 14, the position phase of the light of CD 15 for phase board 12.
That is, with the same phase characteristics of Fig. 3 b, the light beam that form on dish is weakened spherical surface error by the same phase characteristics of Fig. 3 c of phase board 16, ties on CD with the form that is compensated during DVD DVD playing back dish.
Certainly, this moment, phase board 16 was held the phasic difference characteristic of cutting down the dvd pickup instrument because of its characteristic, can not influence the HD optical instrument.
Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used 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 modification of the above embodiment.
Claims (3)
1, the light picker of the compatible usefulness of a kind of HD/DVD, the light that penetrates from light source are exaggerated the thing lens and gather CD with SIL thing lens and become phase, it is characterized in that described light picker also comprises on via the path at the light that becomes phase:
The phase compensation device: hold and cut down HD and DVD spherical surface error, phase characteristics is-f;
When described phase compensation device shows described spherical surface error with the position phase morphology, utilize the periodicity corrugated characteristic that takes place with wavelength, to cut down the phase board formation that phasic difference is a characteristic.
2, the light picker of the compatible usefulness of HD/DVD as claimed in claim 1, it is characterized in that described phase compensation device uses the amplification thing lens that meet HD and design, come the DVD playing back CD, the phase error that takes place when cutting down the DVD playing back CD with amplification thing lens with HD.
3, the light picker of the compatible usefulness of HD/DVD as claimed in claim 1 is characterized in that described phase compensation device is positioned at the front end of DVD light via the amplification thing lens on the path.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031150128A CN1519831A (en) | 2003-01-20 | 2003-01-20 | Light picking up device compatible to HD/DVD |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031150128A CN1519831A (en) | 2003-01-20 | 2003-01-20 | Light picking up device compatible to HD/DVD |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1519831A true CN1519831A (en) | 2004-08-11 |
Family
ID=34284061
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA031150128A Pending CN1519831A (en) | 2003-01-20 | 2003-01-20 | Light picking up device compatible to HD/DVD |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1519831A (en) |
-
2003
- 2003-01-20 CN CNA031150128A patent/CN1519831A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5787061A (en) | Optical disc recording reproducing apparatus recording/reproducing information to/from optical discs according to different standards | |
| CN1447322A (en) | Opticle pick-up device | |
| CN1822145A (en) | Optical pickup which is compatible with multiple types of media | |
| CN1811940A (en) | Optical pickup apparatus which is compatible with multiple types of media | |
| CN1639780A (en) | Optical pickup apparatus capable of compensating thickness deviation of optical recording media | |
| CN1088232C (en) | Optical pickup for using disks each having different thickness | |
| CN1790100A (en) | Optical bench, integrated optical system, and optical alignment method | |
| CN1162851C (en) | Objective glass, reproducing apparatus and method thereof | |
| CN1254913A (en) | Optical record and pick-up head of digital universal disk compatible with read/write optical disk | |
| CN1252884A (en) | Recording medium and optical pickup device | |
| CN1133160C (en) | Optical pick-up device | |
| JP2009129502A (en) | Optical pickup and optical disk drive | |
| CN1855254A (en) | Optical pickup apparatus | |
| CN1297970C (en) | Optical pickup | |
| CN1877714A (en) | Optical recording/reproducing apparatus | |
| JPH09318873A (en) | Chromatic aberration correcting optical system and optical pickup | |
| JPWO2011099329A1 (en) | Objective lens of optical pickup device and optical pickup device | |
| CN1519831A (en) | Light picking up device compatible to HD/DVD | |
| CN1439159A (en) | Focus control device and focus control method | |
| CN1967677A (en) | Optical pickup | |
| JP5083621B2 (en) | Objective lens and optical pickup device | |
| CN1815581A (en) | Optical pick up compatible with multi-type medium | |
| JP2005353250A (en) | Optical pickup and optical disk apparatus | |
| CN1808589A (en) | Optical pickup apparatus | |
| CN1523590A (en) | Optical pickup device being compatible with different recording medium |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |