CN1356572A - Object lens unit able to correct chromatism and its optical pick-up - Google Patents
Object lens unit able to correct chromatism and its optical pick-up Download PDFInfo
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- CN1356572A CN1356572A CN01137814A CN01137814A CN1356572A CN 1356572 A CN1356572 A CN 1356572A CN 01137814 A CN01137814 A CN 01137814A CN 01137814 A CN01137814 A CN 01137814A CN 1356572 A CN1356572 A CN 1356572A
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1372—Lenses
- G11B7/1374—Objective lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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Abstract
An objective lens device and an optical pickup employing the objective lens device. The objective lens device is formed of three lenses including a lens having a negative power and formed of material having an Abbe number which is 45 or less in line d. At least one surface of surfaces of the three lenses is formed to be aspherical. Thus, in the objective lens device, a high numerical aperture of 0.70 or more is realized and chromatic aberration is corrected with respect to blue light enabling improved recording and/or reproduction using blue light.
Description
Technical field
The present invention relates to a kind of objective apparatus, it has big numerical aperture, more specifically, relate to and a kind ofly have big numerical aperture with when realizing highdensity optical convergence, can modifying factor the increase of the variation of light wavelength of light emitted and/or wavelength live width and the objective apparatus of the aberration that causes, and relate to a kind of optical pickup apparatus (optical pickup) that adopts this device.
Background technology
The recording capacity of optical recording/reproducing apparatus is by the size decision that is formed on the hot spot on the CD by object lens.The size of hot spot (S) is directly proportional with wavelength X, and is inversely proportional to the numerical aperture (NA) of object lens.
Therefore, be used for developing be referred to as HDDVD (below, be known as the high-density optical pick device) the optical pickup apparatus of DVD of future generation can adopt the light source of emission blue streak and have the object lens that surpass 0.6 NA, to obtain the higher recording density of information recording density that obtains than from traditional C D or DVD base CD by reducing to be formed on spot size on the CD.
In being shorter than the wavelength coverage of 650nm, such as glass and plastics on refractive index, demonstrate rapid variation as the optical material of objective material, as shown in table 1.
Table 1
| Wavelength variations | The variations in refractive index of the M-BaCD5N of Hoya company glass |
| ????650nm-651nm | ????0.000038 |
| ????405nm-406nm | ????0.000154 |
As what seen in the table 1, change with respect to the small wavelength of 1nm, in the blue streak wavelength coverage, 405nm for example, than in the 650nm of the optical pickup apparatus that is used for DVD wavelength, optical material has shown big four times variation on refractive index.
With respect to blue streak, the above-mentioned rapid variation in the optical material on the refractive index is the one of the main reasons of the mis-behave that caused by mistake Jiao that can write down in high-density optical record/reproducer.By using the described equipment of blue wavelength light source to write down repeatedly and to reproduce.
That is, in recordable optical record/reproducer, use luminous power that is used to write down that differs from one another and the luminous power that is used to reproduce.For the blue streak source, the wavelength variations that changes corresponding to optical output power is for example between 0.5 to 1nm.Usually, if the output of light source increases, then the optical wavelength sent of light source is elongated.So in the situation of the high-density optical pick-up device that adopts the blue streak source, aberration produces, thereby produce mistake Jiao, this aberration causes because of the wavelength variations during the light output at record and between reproducing is changed in the object lens that design with respect to reference wavelength.
For example, as can finding out, shown big wavefront aberration and lost Jiao with respect to the little variation of the objective apparatus with NA of 0.65 of the reference wavelength of 405nm design with respect to about 1nm on the wavelength from Fig. 1 to 3.Fig. 1 is the curve map of the intensity of the hot spot that forms on CD that shows that mistake Jiao of causing with variation by optical output power in the recoding/reproduction process is corresponding.Fig. 2 and 3 is respectively the wavefront aberration with respect to wavelength variations that shows the objective apparatus with NA of a 0.65 (optical path difference: OPD) and lose the curve map of burnt amount.
Though mistake Jiao who is caused by wavelength variations can revise by the instrumentality lens device, because by come the variation of tracking wavelengths to expend the long time with the actuator drives objective apparatus, so the quality of reproduction and tracer signal worsens in said process.Mistake Jiao of the process that the output that is used for writing down increases causes writing down the deficiency with luminous power, and the burnt jitter phenomenon that increases of the mistake of the process that the output that is used for reproducing reduces.
That is, elongated from the light wavelength that light source sends when the output of light source increases with recorded information on CD to for example 406nm, produce on the hot spot that is formed on the CD so lose Jiao.So, tracing into mistake Jiao up to gearing, record just correctly carries out.When the output of light source reduces for reproduction, the wavelength of the light source for example 405nm that shortens.In this case, because gearing is in the tracking mode that is suitable for elongated wavelength, loses Jiao and produce once more.Owing to lose Jiao, shake increases in the reproducing signal.
In addition, when light source drive to reduce by high frequency (HF) since light when CD turns back to the feedback noise of the light source that causes the light source, the wavelength live width of light source is increased to for example about 1nm, and aberration correspondingly makes the reproducing signal variation.
Thereby the high-density optical pick-up that can repeat to write need have and can limit or optical system that compensate for chromatic aberration produces, even change according to the variation in the record and the output of reproducing when light wavelength that light source sends.
The traditional objective apparatus with two lens with function of revising aberration discloses in 10-123410 number at Jap.P. to be mentioned.
With reference to Fig. 4, the tradition objective apparatus comprises first and second lens of being made by low dispersion 1 and 4, the abbe number (Abbe number Abbe number) that this glass has above 40 is configured as aspheric surface to have at least one, so, for the light of wavelength, can realize the correction of aberration and big NA with 635nm.Aberration is revised by first lens 1 that are arranged on dish 6 and be used between second lens 4 of optically focused, and objective apparatus has and surpasses 0.7 NA.Reference numeral 2 expressions are used to limit the aperture of light input range.
Yet, have the low dispersion that surpasses 40 abbe number because traditional objective apparatus is formed by two lens in two groups and uses, so the correction of aberration and high NA can realize with respect to the light of the wavelength with 635nm.Yet, with respect to impossible correction and the high NA that realizes aberration of blue streak.
Summary of the invention
In order to address the above problem, an object of the present invention is to provide a kind of objective apparatus, it can and realize high numerical aperture with respect to blue streak correction aberration, and a kind of optical pickup apparatus that adopts this device.
Therefore, to achieve these goals, provide a kind of objective apparatus that comprises three lens, comprise in these lens one have negative enlargement ratio and be 45 or the lens of the made of littler abbe number by having among the online d, wherein, at least one is aspheric in the surface of three lens.
In the present invention, preferably, at least one has positive enlargement ratio in three lens, and the lens with negative enlargement ratio close lens with the synthetic a pair of of a lens combination with positive enlargement ratio, so form the structure of two groups of three lens.
In the present invention, preferably, to begin be first lens with positive enlargement ratio successively, have second lens of negative enlargement ratio and have the 3rd lens of positive enlargement ratio from a side of light input for three lens.
In the present invention, preferably, the focal length of supposing to have the lens of negative enlargement ratio is that total focal length of fn and objective apparatus is f, and then objective apparatus satisfies equation
To achieve these goals, a kind of optical pickup apparatus is provided, it comprises and is used for producing and radiative light source, be used for the optical convergence of light emitted is become the objective apparatus of the hot spot that forms on the recording medium, the light path that is arranged on the travel path that is used to change incident light on the light path between light source and the objective apparatus changes device, and receive and to be recorded the medium reflection and to change device and be input to the photoelectric detector of the light on it via objective apparatus and light path, wherein objective apparatus comprises three lens, these three lens comprise that one has negative enlargement ratio and is 45 or the lens of the made of littler abbe number by having among the online d, and at least one is an aspheric surface in the surface of three lens.
In the present invention, preferably, source reflection has the roughly light of the wavelength between 400-420nm, and objective apparatus has 0.7 or bigger numerical aperture.
Description of drawings
Detailed description of the preferred embodiment in conjunction with the drawings, above-mentioned purpose of the present invention and advantage will become more obvious, wherein:
Fig. 1 shows with record and the curve of the intensity of the burnt corresponding hot spot that forms on recording medium of mistake that the variation of optical output power causes between reproducing;
Fig. 2 and 3 be respectively show with wavelength variations have accordingly 0.65 NA objective apparatus wavefront aberration and lose the curve map of burnt amount;
Fig. 4 is the figure that shows the example of traditional objective apparatus;
Fig. 5 schematically shows the figure of objective apparatus according to an embodiment of the invention;
Fig. 6 schematically shows to adopt the figure of the optical pickup apparatus of objective apparatus according to the preferred embodiment of the invention;
Fig. 7 is the figure of demonstration according to the structure of the objective apparatus of first optical design of the present invention shown in the table 2;
Fig. 8 is the figure of demonstration according to the aberration of the objective apparatus of the present invention of the optical data design of table 2;
Fig. 9 is the figure of demonstration according to the structure of the objective apparatus of second optical design of the present invention shown in the table 3;
Figure 10 is the figure of demonstration according to the aberration of the objective apparatus of the present invention of the optical data design of table 3;
Figure 11 is the figure of demonstration according to the structure of the objective apparatus of the 3rd optical design of the present invention shown in the table 4;
Figure 12 is the figure of demonstration according to the aberration of the objective apparatus of the present invention of the optical data design of table 4;
Figure 13 is the figure of demonstration according to the structure of the objective apparatus of the 4th optical design of the present invention shown in the table 5; And
Figure 14 is the figure of demonstration according to the aberration of the objective apparatus of the present invention of the optical data design of table 5;
Embodiment
With reference to Fig. 5, objective apparatus 10 according to the present invention is made of first to the 3rd lens 11,13 and 15 that the side from input light begins.In first to the 3rd lens 11,13 and 15 at least one is 45 or the glass or the plastic material manufacturing of littler abbe number by having on the online d, and has negative enlargement ratio, and described abbe number is preferably 35 or littler.In first to the 3rd lens 11,13 and 15 the surface at least one, for example light incides the surperficial 15a of the 3rd lens 15 on it, is formed by non-spherical surface.
In addition, for example, the focal length of supposing to have second lens 13 of negative enlargement ratio is fn, and total focal length of objective apparatus 10 is f, and then objective apparatus 10 satisfies following equatioies 1.
Fig. 6 shows and adopts the optical pickup apparatus of objective apparatus according to the preferred embodiment of the invention.
With reference to diagram, optical pickup apparatus comprises light source 51 according to the preferred embodiment of the invention, the light path that is used to change the incident light travel path changes device, be used on recording medium 30 light by focused light source 51 emissions forms the objective apparatus of the present invention 10 of hot spot and is used to receive and be recorded medium 30 reflections and pass the photoelectric detector 73 that light path changes the light of device.
The blue streak semiconductor laser that emission has the light of about 400nm to 420nm wavelength is used for light source 51, the preferably about 450nm of this wavelength.As semiconductor laser, a kind of edge-emitting laser (edgeemitting laser) and a kind of vertical cavity surface emitting lasers (vertical cavity surfaceemitting laser) are arranged.
Light path changes device and is arranged on the light path between light source 51 and the objective apparatus 10, and changes the travel path of incident light.Light path changes device and preferably includes and be used for according to polarization and the polarising beam splitter 57 of selective transmission or reflection incident light, and the quarter wave plate 59 that is used to change the phase place of incident light, as shown in Figure 6.Herein, the beam separator (not shown) with estimated rate projection and reflection incident light can be comprised that making light path changes device.
Preferably, between light source 51 and light path change device collimation lens 53 is set also, the diverging light of collimation lens 53 convergent light sources 51 emissions is so that light becomes collimated beam.As shown in Figure 7, when collimation lens 53 is arranged in light source 51 and light path when changing on the light path between the device, changing between device and the photoelectric detector 73 in light path further provides convergent lens 71.
When edge emitter laser is used as light source 51, on the light path between collimation lens 53 and the light path change device, a beam shaping prism 55 is set again, so can be with lower output record information.Beam shaping prism 55 is configured as round light beam with the elliptical beam of edge emitter laser emission, and beam shaping prism 55 can be arranged between light source 51 and the collimation lens 53.Herein, when the vertical cavity surface emitting laser that will be used to launch the subcircular light beam during as light source 51, beam shaping prism 55 is removed from the optical system of Fig. 7.
Herein, Reference numeral 73 expression sensing lens.When focus error signal detects with astigmatism method, for example, astigmatic lens can be used as sensing lens 73 so that incident light is produced astigmatism.
Because optical pickup apparatus of the present invention comprises and can realize big numerical aperture and revise the objective apparatus 10 of aberration with respect to blue streak, so information can be recorded on the recording medium of DVD series of future generation and reproduce from it.
So, because cause the aberration that produces with the change of the optical wavelength of corresponding light source 51 emissions of the change of light in the handoff procedure of reproduction mode and logging mode output, revised by objective apparatus 10 with the increase of wavelength live width when light source 51 is driven by HF, so can write down with respect to the recording medium of DVD series of future generation and/or reproduce according to the optical pickup apparatus of employing objective apparatus 10 of the present invention and blue streak light source.
Herein, Fig. 6 shows and adopts the optical pickup apparatus of objective apparatus 10 according to the preferred embodiment of the invention.Yet optical pickup apparatus according to the present invention is not limited to the above-mentioned optical texture of Fig. 6.
In order to verify aberration effect, will be described below according to first to the 4th optical design embodiment of objective apparatus 10 of the present invention with respect to blue streak according to objective apparatus 10 of the present invention.In first to the 4th optical design embodiment, objective apparatus 10 according to the present invention is made of first lens 11 with positive enlargement ratio, the 3rd lens 15 that have second lens 13 of negative enlargement ratio and have a positive enlargement ratio.The surperficial 15a that light incides the 3rd lens 15 on it forms aspheric surface shape.Reference wavelength is 405nm, and is 1.765mm with respect to the total focal length of the recording medium with 0.1mm thickness.In addition, input has the parallel beam of the diameter of 3.0mm entrance pupil, and numerical aperture is 0.70 or bigger.
Table 2 and Fig. 7 show the first optical design embodiment according to objective apparatus 10 of the present invention.Fig. 8 shows the aberration according to objective apparatus 10 of the present invention of the optical data with table 2.Table 3 and Fig. 9 show the second optical design embodiment according to objective apparatus 10 of the present invention.Figure 10 shows the aberration according to objective apparatus 10 of the present invention of the optical data with table 3.Table 4 and Figure 11 show the 3rd optical design embodiment according to objective apparatus 10 of the present invention.Figure 12 shows the aberration according to objective apparatus 10 of the present invention of the optical data with table 4.
[table 2]
| The surface | Radius-of-curvature (mm) | Thickness/spacing (mm) | Material (glass) | Refraction coefficient | Abbe number among the line d |
| ??S11 | ??3.003070 | ??1.2000000 | ??E-BaF8HOYA | ?1.646734 | ???47.1 |
| ??S12 | ??-3.003070 | ??0.500000 | ??E-FD4?HOYA | ?1.806295 | ???27.5 |
| ??S13 | ??∞ | ??1.707467 |
| S14 (non-spherical surface) | ?0.911822 | ??1.250000 | ??M-Lac130?HOYA | ??1.715566 | ?????53.2 |
| ?K：-0.699640 ?A：0.917676E-01?B：0.462801E-01?C：0.317180E-01?D：0.114090E+00 ?E：-.182547E+00?F：-.198125E-09?G：-.406463E-10 | |||||
| ????S15 | ????∞ | ??0.100000 | |||
| ????S16 | ????∞ | ??0.100000 | ????′CG′ | ???1.621462 | ?????31.0 |
| ????S17 | ????∞ | ??0.000000 | |||
[table 3]
| The surface | Radius-of-curvature (mm) | Thickness/spacing (mm) | Material (glass) | Refraction coefficient | Abbe number among the line d |
| ????S21 | ??2.823244 | ??1.3500000 | ??E-BaF8?HOYA | ??1.646734 | ???47.1 |
| ????S22 | ??-2.798572 | ??0.500000 | ??E-FD4?HOYA | ??1.806295 | ???27.5 |
| ????S23 | ??148.526158 | ??1.020972 | |||
| S24 (non-spherical surface) | ??0.903599 | ??1.300000 | ??M-BaCD5N?HOYA | ??1.605183 | ???61.3 |
| ?K：-0.596430 ?A：0.807580E-01?B：-.827319E-02?C：0.165423E+00?D：-.912224E-01 | |||||
| ????S25 | ??∞ | ??0.150000 | |||
| ????S26 | ??∞ | ??0.100000 | ????′CG′ | ??1.621462 | ???31.0 |
| ????S27 | ??∞ | ??0.000000 | |||
[table 4]
| The surface | Radius-of-curvature (mm) | Thickness/spacing (mm) | Material (glass) | Refraction coefficient | Abbe number among the line d |
| ??S31 | ???2.591625 | ??1.5000000 | ??E-BaF8?HOYA | ??1.646734 | ???47.1 |
| ??S32 | ???-2.636949 | ??0.500000 | ??E-FD4?HOYA | ??1.806295 | ???27.5 |
| ??S33 | ???13.932416 | ??1.649604 |
| S34 (non-spherical surface) | ??0.795351 | ??1.000000 | ?M-Lac130?HOYA | ??1.715566 | ????53.2 |
| ?K：-0.350912 ?A：0.333620E-01?B：-.767010E-01?C：0.337696E+00?D：-.546842E+00 | |||||
| ????S35 | ????∞ | ???0.150000 | |||
| ????S36 | ????∞ | ???0.100000 | ????′CG′ | ??1.621462 | ????31.0 |
| ????S37 | ????∞ | ???0.000000 | |||
As table 2 to shown in 4, in first to the 3rd optical design embodiment of objective apparatus 10 according to the present invention, each second lens 13 with negative enlargement ratio is made by the glass with abbe number of 27.5, and the focal length of second lens 13 of embodiment be designed to respectively-3.725mm ,-3.402mm and-2.713mm.
Can see as Fig. 8,10 and 12 of the aberration of the objective apparatus 10 that has the optical data of table 2 to 4 from demonstration, almost do not produce for objective apparatus 10 aberrations, even when light source 51 wavelength of light emitted change to the 406nm of the reference wavelength that exceeds 405nm.
Table 5 and Figure 13 show the 4th optical design embodiment according to objective apparatus 10 of the present invention.Figure 14 shows the aberration according to objective apparatus 10 of the present invention of the optical data with table 5.
[table 5]
| The surface | Radius-of-curvature (mm) | Thickness/spacing (mm) | Material (glass) | Refraction coefficient | Abbe number among the line d |
| ???S41 | ??3.01733?1 | ??1.2000000 | ??E-BaCD12?HOYA | ??1.599581 | ????59.5 |
| ???S42 | ??-2.869224 | ??0.500000 | ??E-FD8?HOYA | ??1.729488 | ????31.2 |
| ???S43 | ??∞ | ??1.872786 | |||
| S44 (non-spherical surface) | ??0.888542 | ??1.250000 | ??M-Lac130?HOYA | ??1.715566 | ????53.2 |
| ??K：-0.654060 ??A：0.895216E-01?B：0.422347E-01?C：0.559695E-01?D：0.930347E-01 ??E：-.182547E+00?F：-.193469E-09 | |||||
| ???S45 | ??∞ | ??0.100000 | |||
| ???S46 | ??∞ | ??0.100000 | ????′CG′ | ??1.621462 | ????31.0 |
| ???S47 | ??∞ | ??0.000000 | |||
As shown in table 5, in the 4th optical design embodiment of objective apparatus 10 according to the present invention, second lens 13 with negative enlargement ratio are made by the glass with abbe number of 31.2, and the focal length of second lens 13 is designed to-3.933mm.
As seen from Figure 14, in the objective apparatus of the present invention 10 of the optical data with table 5, aberration takes place hardly, even when light source 51 wavelength of light emitted change to the 406nm of the reference wavelength that exceeds 405nm.
Suppose that the degree of depth apart from the summit of non-spherical surface is Z, then the equation of non-spherical surface S14, S24, S34 and S44 can be expressed by equation 2.
[equation 2]
Table 2 to 5 and equation 2 in, K is the hyperbolic curve constant (conic constant) of non-spherical surface S14, S24, S34 and the S44 of the 3rd lens 15, and A is the non-spherical surface coefficient to J.In addition, h represents the height apart from optical axis, and c represents curvature.
As what can see from above-mentioned optical design embodiment, objective apparatus 10 according to the present invention has the function with respect to blue streak correction aberration.
So, when the optical pickup apparatus of the recording medium that is used for DVD series of future generation that uses the blue streak light source adopts according to objective apparatus 10 of the present invention, can obtain the record and/or the reproducing signal of high-quality.
As mentioned above, because objective apparatus according to the present invention by comprise one have negative enlargement ratio and by have on the online d be 45 or three lens of the lens of the made of littler abbe number form, and at least one in the surface of these three lens formed by non-spherical surface, so can realize big numerical aperture, and can revise aberration with respect to blue streak.So by using the optical pickup apparatus that adopts according to objective apparatus of the present invention, the record of high-quality and/or reproduction are possible.
Claims (14)
1. objective apparatus, it is characterized in that, comprise three lens, comprise one in these three lens and have negative enlargement ratio and be 45 or the lens of the made of littler abbe number by having on the online d, wherein, at least one is an aspheric surface in the surface of three lens.
2. device according to claim 1, it is characterized in that, in three lens at least one has positive enlargement ratio, and has lens and the synthetic doublet of the lens combination with positive enlargement ratio of negative enlargement ratio, so form the structure of two groups of three lens.
3. device according to claim 1 is characterized in that, the numerical aperture of this device is 0.70 or bigger.
4. device according to claim 1 is characterized in that, the lens with negative enlargement ratio are 45 or the glass or the plastics manufacturing of littler abbe number by having on the online d.
5. according to any one the described device in the claim 1 to 4, it is characterized in that, from a side of light incident, three lens are followed successively by first lens with positive enlargement ratio, have second lens of negative enlargement ratio and have the 3rd lens of positive enlargement ratio.
6. device according to claim 5 is characterized in that, the focal length of supposing to have second lens of negative enlargement ratio is that total focal length of fn and objective apparatus is f, and then objective apparatus satisfies following equation
7. according to any one the described device in the claim 1 to 4, it is characterized in that the focal length of supposing to have the lens of negative enlargement ratio is that total focal length of fn and objective apparatus is f, then objective apparatus satisfies following equation
8. optical pickup apparatus, comprise and be used for producing and radiative light source, be used for the optical convergence of light emitted is become the objective apparatus of the hot spot that forms on the recording medium, the light path that is arranged on the travel path that is used to change incident light on the light path between light source and the objective apparatus changes device, and receive and to be recorded the medium reflection and to change device and be input to the photoelectric detector of the light on it via objective apparatus and light path, this optical pickup apparatus is characterised in that, objective apparatus comprises three lens, these three lens comprise one to have negative enlargement ratio and is 45 or the lens of the made of littler abbe number by having among the online d, and at least one is an aspheric surface in the surface of three lens.
9. optical pickup apparatus according to claim 8 is characterized in that, at least one in three lens has positive enlargement ratio, and has lens and the synthetic doublet of the lens combination with positive enlargement ratio of negative enlargement ratio.
10. optical pickup apparatus according to claim 8 is characterized in that, light emitted has the roughly light of the wavelength between 400-420nm, and objective apparatus has 0.7 or bigger numerical aperture.
11. optical pickup apparatus according to claim 8 is characterized in that, the lens with negative enlargement ratio are 45 or the glass or the plastics manufacturing of littler abbe number by having on the online d.
12. any one described optical pickup apparatus in 11 according to Claim 8, it is characterized in that, from a side of light incident, this objective apparatus is made of successively first lens with positive enlargement ratio, the 3rd lens that have second lens of negative enlargement ratio and have a positive enlargement ratio.
13. optical pickup apparatus according to claim 12 is characterized in that, the focal length of supposing to have second lens of negative enlargement ratio is that total focal length of fn and objective apparatus is f, and then objective apparatus satisfies following equation
14. any one the described optical pickup apparatus in 11 is characterized in that according to Claim 8, the focal length of supposing to have the lens of negative enlargement ratio is total focal distance f of fn and objective apparatus, for objective apparatus then satisfies following equation
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR74312/00 | 2000-12-07 | ||
| KR74312/2000 | 2000-12-07 | ||
| KR10-2000-0074312A KR100393059B1 (en) | 2000-12-07 | 2000-12-07 | Objective lens apparatus for capable of compensating chromatic aberration and optical pickup adopting it |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1356572A true CN1356572A (en) | 2002-07-03 |
| CN1222803C CN1222803C (en) | 2005-10-12 |
Family
ID=19702798
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB01137814XA Expired - Fee Related CN1222803C (en) | 2000-12-07 | 2001-11-08 | Object lens unit able to correct chromatism and its optical pick-up |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP3558218B2 (en) |
| KR (1) | KR100393059B1 (en) |
| CN (1) | CN1222803C (en) |
| TW (1) | TW563109B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100454074C (en) * | 2002-12-10 | 2009-01-21 | 旭硝子株式会社 | Objective lens for optical information recording medium |
| CN100501502C (en) * | 2006-07-19 | 2009-06-17 | 清华大学深圳研究生院 | Collimated light path structure of laser read head |
| CN112987252A (en) * | 2021-03-05 | 2021-06-18 | 江西晶超光学有限公司 | Optical system, infrared receiving module and electronic equipment |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005101393A1 (en) * | 2004-04-13 | 2005-10-27 | Konica Minolta Opto, Inc. | Object optical system for optical pickup device, optical pickup device, drive device for optical information recording medium, condensing lens, and light path synthesizing element |
-
2000
- 2000-12-07 KR KR10-2000-0074312A patent/KR100393059B1/en not_active IP Right Cessation
-
2001
- 2001-10-09 TW TW090124891A patent/TW563109B/en not_active IP Right Cessation
- 2001-11-08 CN CNB01137814XA patent/CN1222803C/en not_active Expired - Fee Related
- 2001-11-09 JP JP2001345269A patent/JP3558218B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100454074C (en) * | 2002-12-10 | 2009-01-21 | 旭硝子株式会社 | Objective lens for optical information recording medium |
| CN100501502C (en) * | 2006-07-19 | 2009-06-17 | 清华大学深圳研究生院 | Collimated light path structure of laser read head |
| CN112987252A (en) * | 2021-03-05 | 2021-06-18 | 江西晶超光学有限公司 | Optical system, infrared receiving module and electronic equipment |
| CN112987252B (en) * | 2021-03-05 | 2023-11-07 | 江西晶超光学有限公司 | Optical system, infrared receiving module and electronic equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1222803C (en) | 2005-10-12 |
| KR20020045024A (en) | 2002-06-19 |
| KR100393059B1 (en) | 2003-07-31 |
| TW563109B (en) | 2003-11-21 |
| JP2002267927A (en) | 2002-09-18 |
| JP3558218B2 (en) | 2004-08-25 |
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