KR101215272B1 - High capacity optical pick-up object lens - Google Patents

High capacity optical pick-up object lens Download PDF

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Publication number
KR101215272B1
KR101215272B1 KR1020100028654A KR20100028654A KR101215272B1 KR 101215272 B1 KR101215272 B1 KR 101215272B1 KR 1020100028654 A KR1020100028654 A KR 1020100028654A KR 20100028654 A KR20100028654 A KR 20100028654A KR 101215272 B1 KR101215272 B1 KR 101215272B1
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South Korea
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objective lens
optical pickup
present
capacity optical
high capacity
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KR1020100028654A
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Korean (ko)
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KR20110109096A (en
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박수천
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방주광학 주식회사
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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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/02—Simple or compound lenses with non-spherical faces
    • G02B3/08—Simple or compound lenses with non-spherical faces with discontinuous faces, e.g. Fresnel lens
    • 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
    • G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
    • G11B7/127—Lasers; Multiple laser arrays
    • G11B7/1275—Two or more lasers having different wavelengths
    • 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
    • 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
    • G11B7/1392—Means for controlling the beam wavefront, e.g. for correction of aberration
    • G11B7/13922—Means for controlling the beam wavefront, e.g. for correction of aberration passive

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Lenses (AREA)

Abstract

본 발명은 고용량 광 픽업용 대물렌즈에 관한 것이다.
즉, 본 발명의 고용량 광 픽업용 대물렌즈는 대물렌즈의 형상은 0.1<

Figure 112010020305443-pat00024
<0.3을 만족하고, 곡률반경의 비율은 -0.75<
Figure 112010020305443-pat00025
<-0.65를 만족하는 것을 특징으로 한다.The present invention relates to an objective lens for high capacity optical pickup.
That is, the objective lens of the high-capacity optical pickup of the present invention has a shape of 0.1 <
Figure 112010020305443-pat00024
<0.3 is satisfied, and the ratio of the radius of curvature is -0.75 <
Figure 112010020305443-pat00025
<-0.65 is satisfied.

Description

대용량 광 픽업용 대물렌즈 { High capacity optical pick-up object lens }High-capacity optical pick-up object lens

본 발명은 수차를 감소시켜 광 픽업 광학계의 성능을 향상시킬 수 있는 대용량 광 픽업용 대물렌즈에 관한 것이다.
The present invention relates to a large-capacity optical pickup objective lens capable of reducing aberration to improve the performance of the optical pickup optical system.

일반적으로 광디스크는 그 표면에 수많은 피트(pit)를 천공하여 레이저 광의 반사를 변화시킴으로써, 음성, 화상, 문서 등의 데이터를 기록/재생하기 위한 저장매체를 말하며, 현재 상용화된 대표적인 광디스크로는 CD(Compact Disc)와 DVD(Digital Versatile Disc)가 있다.In general, an optical disc refers to a storage medium for recording / reproducing data such as voice, images, documents, etc. by drilling a lot of pits on the surface thereof to change the reflection of the laser light. Compact Disc) and DVD (Digital Versatile Disc).

근래에는 차세대 광디스크로 CD나 DVD보다 기록용량을 더욱 높인 고밀도 기록매체에 대한 연구가 활발히 진행되고 있는데 이러한 고밀도 기록매체로는 BD(Blu-ray Disc)와 HD-DVD(High Definition Digital Versatile Disc)가 있다.Recently, researches on high-density recording media with higher recording capacity than CDs or DVDs as next-generation optical discs are being actively conducted. Such high-density recording media include BD (Blu-ray Disc) and HD-DVD (High Definition Digital Versatile Disc). have.

최근, 청색 레이저를 이용한 고밀도 광디스크(Blu-ray, HD-DVD)가 실용화되기 시작하고 있다. 광디스크의 기록밀도는 정보기록면에 집광하는 광스폿 지름에 의존한다. Recently, high-density optical discs (Blu-ray, HD-DVD) using a blue laser have begun to be put into practical use. The recording density of the optical disc depends on the diameter of the optical spot condensing on the information recording surface.

이 광스폿 지름은 λ를 광원으로부터 출사되는 광의 파장, NA를 대물렌즈의 상측 개구수로 하여 λ/NA에 비례한다. 따라서 광디스크의 고밀도화는 광픽업용 레이저광의 단파장화 및 대물렌즈에서의 고 NA화에 의하여 실현할 수 있다. This light spot diameter is proportional to λ / NA, with λ being the wavelength of light emitted from the light source and NA being the image numerical aperture of the objective lens. Therefore, the higher density of the optical disk can be realized by shortening the wavelength of the optical pickup laser light and increasing the NA in the objective lens.

이와 같은 청색 레이저를 사용한 고밀도 광디스크장치에서는 CD나 DVD 등의 기존의 광디스크를 기록?재생할 수 있도록 호환성을 가지고 있는 광디스크장치인 것이 바람직하다. In such a high-density optical disk device using a blue laser, it is preferable that the optical disk device is compatible to record and reproduce an existing optical disk such as a CD or a DVD.

이와 같은 호환성을 가지는 광디스크장치로서는 각각의 광디스크에 대응하는 광원을 사용할 필요가 있다. As an optical disk device having such compatibility, it is necessary to use a light source corresponding to each optical disk.

또 광픽업에 있어서도 광디스크의 종류마다 대물렌즈를 설치하여 사용하는 광디스크의 종류에 따라 대물렌즈를 교환하기도 하고, 광디스크의 종류마다 광픽업장치를 설치하여 사용하는 광디스크의 종류에 따라 광픽업장치를 교환하기도 하는 것을 생각할 수 있다.
Also, in the optical pickup, the objective lens may be replaced according to the type of optical disc used by installing the objective lens for each type of optical disc, and the optical pickup device may be replaced according to the type of optical disc used by installing the optical pickup device for each type of optical disc. I can think of doing.

본 발명은 수차를 감소시킬 수 있는 과제를 해결하는 것이다.
The present invention is to solve the problem that can reduce the aberration.

본 발명은, The present invention,

고용량 광 픽업의 대물렌즈에 있어서,In the objective lens of the high capacity optical pickup,

상기 대물렌즈의 형상은 0.1<

Figure 112010020305443-pat00001
<0.3을 만족하고, 곡률반경의 비율은 -0.75<
Figure 112010020305443-pat00002
<-0.65를 만족하며, The shape of the objective lens is 0.1 <
Figure 112010020305443-pat00001
<0.3 is satisfied, and the ratio of the radius of curvature is -0.75 <
Figure 112010020305443-pat00002
<-0.65,

상기 대물렌즈의 첫째면의 곡률반경 R1이고, 둘째면의 곡률반경 R2인 것을 특징으로 하는 고용량 광 픽업의 대물렌즈가 제공된다.
The objective lens of the high-capacity optical pickup is characterized by a radius of curvature R1 of the first side of the objective lens and a radius of curvature R2 of the second side of the objective lens.

본 발명의 고용량 광 픽업의 대물렌즈는 대물렌즈의 형상이 0.1<

Figure 112010020305443-pat00003
<0.3을 만족하고, 곡률반경의 비율이 -0.75<
Figure 112010020305443-pat00004
<-0.65를 만족하게 구현됨으로써, 광 픽업 광학계에서 수차를 현저하게 감소시킬 수 있는 효과가 있다.In the objective lens of the high-capacity optical pickup of the present invention, the objective lens has a shape of 0.1 <
Figure 112010020305443-pat00003
<0.3 is satisfied, and the ratio of the radius of curvature is -0.75 <
Figure 112010020305443-pat00004
By satisfying <-0.65, there is an effect capable of significantly reducing aberration in the optical pickup optical system.

또한, 본 발명의 고용량 광 픽업의 대물렌즈를 적용한 광 픽업 광학계의 성능을 향상시킬 수 있는 효과가 있다.
In addition, there is an effect that can improve the performance of the optical pickup optical system to which the objective lens of the high capacity optical pickup of the present invention is applied.

도 1은 본 발명에 따른 고용량 광 픽업의 대물렌즈를 설명하기 위한 개략적인 단면도
도 2는 본 발명의 제 1 실시예에 따른 고용량 광 픽업의 대물렌즈의 구면 수차도
도 3은 본 발명의 제 1 실시예에 따른 고용량 광 픽업의 대물렌즈의 비점수차도
도 4는 본 발명의 제 1 실시예에 따른 고용량 광 픽업의 대물렌즈의 디스크에 광이 결상된 상태를 도시한 다이아그램
도 5는 본 발명의 제 2 실시예에 따른 고용량 광 픽업의 대물렌즈의 구면 수차도
도 6은 본 발명의 제 2 실시예에 따른 고용량 광 픽업의 대물렌즈의 비점수차도
도 7은 본 발명의 제 2 실시예에 따른 고용량 광 픽업의 대물렌즈의 디스크에 광이 결상된 상태를 도시한 다이아그램
도 8은 본 발명의 제 3 실시예에 따른 고용량 광 픽업의 대물렌즈의 구면 수차도
도 9는 본 발명의 제 3 실시예에 따른 고용량 광 픽업의 대물렌즈의 비점수차도
도 10은 본 발명의 제 3 실시예에 따른 고용량 광 픽업의 대물렌즈의 디스크에 광이 결상된 상태를 도시한 다이아그램1 is a schematic cross-sectional view illustrating an objective lens of a high capacity optical pickup according to the present invention.
2 is a spherical aberration diagram of the objective lens of the high capacity optical pickup according to the first embodiment of the present invention.
Fig. 3 is an astigmatism diagram of the objective lens of the high capacity optical pickup according to the first embodiment of the present invention.
4 is a diagram showing a state in which light is formed on the disk of the objective lens of the high capacity optical pickup according to the first embodiment of the present invention.
5 is a spherical aberration diagram of the objective lens of the high capacity optical pickup according to the second embodiment of the present invention.
Fig. 6 is an astigmatism diagram of the objective lens of the high capacity optical pickup according to the second embodiment of the present invention.
7 is a diagram showing a state in which light is imaged on the disk of the objective lens of the high capacity optical pickup according to the second embodiment of the present invention.
8 is a spherical aberration diagram of the objective lens of the high capacity optical pickup according to the third embodiment of the present invention.
Fig. 9 is an astigmatism diagram of the objective lens of the high capacity optical pickup according to the third embodiment of the present invention.
10 is a diagram showing a state in which light is imaged on the disk of the objective lens of the high capacity optical pickup according to the third embodiment of the present invention.

이하, 첨부된 도면을 참조하여 본 발명의 실시예를 설명하면 다음과 같다.Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

도 1은 본 발명에 따른 고용량 광 픽업의 대물렌즈를 설명하기 위한 개략적인 단면도이고, 도 2는 본 발명의 제 1 실시예에 따른 고용량 광 픽업의 대물렌즈의 구면 수차도이고, 도 3은 본 발명의 제 1 실시예에 따른 고용량 광 픽업의 대물렌즈의 비점수차도이고, 도 4는 본 발명의 제 1 실시예에 따른 고용량 광 픽업의 대물렌즈의 디스크에 광이 결상된 상태를 도시한 다이아그램이고, 도 5는 본 발명의 제 2 실시예에 따른 고용량 광 픽업의 대물렌즈의 구면 수차도이고, 도 6은 본 발명의 제 2 실시예에 따른 고용량 광 픽업의 대물렌즈의 비점수차도이고, 도 7은 본 발명의 제 2 실시예에 따른 고용량 광 픽업의 대물렌즈의 디스크에 광이 결상된 상태를 도시한 다이아그램이고, 도 8은 본 발명의 제 3 실시예에 따른 고용량 광 픽업의 대물렌즈의 구면 수차도이고, 도 9는 본 발명의 제 3 실시예에 따른 고용량 광 픽업의 대물렌즈의 비점수차도이고, 도 10은 본 발명의 제 3 실시예에 따른 고용량 광 픽업의 대물렌즈를 통하여 광이 디스크에 결상된 상태를 도시한 다이아그램이다.1 is a schematic cross-sectional view illustrating an objective lens of a high capacity optical pickup according to the present invention, FIG. 2 is a spherical aberration diagram of the objective lens of the high capacity optical pickup according to the first embodiment of the present invention, and FIG. Astigmatism diagrams of the objective lens of the high-capacity optical pickup according to the first embodiment of the present invention, and FIG. 4 is a diagram showing a state in which light is formed on the disk of the objective lens of the high-capacity optical pickup according to the first embodiment of the present invention. 5 is a spherical aberration diagram of the objective lens of the high capacity optical pickup according to the second embodiment of the present invention, and FIG. 6 is the astigmatism diagram of the objective lens of the high capacity optical pickup according to the second embodiment of the present invention. 7 is a diagram showing a state in which light is formed on the disk of the objective lens of the high capacity optical pickup according to the second embodiment of the present invention, and FIG. 8 is a diagram of the high capacity optical pickup according to the third embodiment of the present invention. Spherical Aberration of Objective Lens 9 is an astigmatism diagram of the objective lens of the high-capacity optical pickup according to the third embodiment of the present invention, and FIG. 10 is a view showing the light on the disc through the objective lens of the high-capacity optical pickup according to the third embodiment. It is a diagram showing an open phase.

본 발명에 따른 고용량 광 픽업의 대물렌즈(100)는 대물렌즈(100)의 형상이 0.1<

Figure 112010020305443-pat00005
<0.3을 만족하고, 곡률반경의 비율은 -0.75<
Figure 112010020305443-pat00006
<-0.65를 만족하며, 상기 대물렌즈의 첫째면의 곡률반경 R1이고, 둘째면의 곡률반경 R2인 것을 특징으로 한다.In the objective lens 100 of the high-capacity optical pickup according to the present invention, the shape of the objective lens 100 is 0.1 <
Figure 112010020305443-pat00005
<0.3 is satisfied, and the ratio of the radius of curvature is -0.75 <
Figure 112010020305443-pat00006
<-0.65 is satisfied, and the radius of curvature R1 of the first surface of the objective lens is R2.

즉, 본 발명의 고용량 광 픽업의 대물렌즈(100)의 형상이 0.1<

Figure 112010020305443-pat00007
<0.3을 만족하고, 곡률반경의 비율이 -0.75<
Figure 112010020305443-pat00008
<-0.65를 만족하면 광 픽업 광학계에서 수차를 현저하게 감소시킬 수 있는 장점이 있다.That is, the shape of the objective lens 100 of the high capacity optical pickup of the present invention is 0.1 <
Figure 112010020305443-pat00007
<0.3 is satisfied, and the ratio of the radius of curvature is -0.75 <
Figure 112010020305443-pat00008
If it satisfies <-0.65, the aberration can be significantly reduced in the optical pickup optical system.

그리고, 도 1의 'OAL'은 대물렌즈(100) 선단면에서 디스크(200)까지의 거리이고, 't'는 대물렌즈(100)의 중심 두께이고, 'sag1'은 대물렌즈(100)의 선단면의 sag값이고, 'S1'은 대물렌즈(100)의 선단면이고, 'S2'는 대물렌즈(100)의 후단면이고, 'S3'은 디스크(200)의 선단면이다.In addition, 'OAL' of FIG. 1 is a distance from the front end surface of the objective lens 100 to the disk 200, 't' is the center thickness of the objective lens 100, and 'sag1' is the distance of the objective lens 100. The sag value of the front end surface, 'S1' is the front end surface of the objective lens 100, 'S2' is the rear end surface of the objective lens 100, 'S3' is the front end surface of the disk 200.

이런 본 발명의 고용량 광 픽업의 대물렌즈(100)는 초점거리 f가 1.5<

Figure 112010020305443-pat00009
<1.6를 만족하는 것이 바람직하다.The objective lens 100 of the high-capacity optical pickup of the present invention has a focal length f of 1.5 <
Figure 112010020305443-pat00009
It is preferable to satisfy <1.6.

그리고, 상기 대물렌즈(100)의 개구수 NA는 1.6<

Figure 112010020305443-pat00010
<1.7을 만족하는 것이 바람직하다.The numerical aperture NA of the objective lens 100 is 1.6 <
Figure 112010020305443-pat00010
It is preferable to satisfy <1.7.

또, 상기 대물렌즈(100)의 중심 두께(t)는 2.0<

Figure 112010020305443-pat00011
<2.2를 만족하는 것이 바람직하다.In addition, the center thickness t of the objective lens 100 is 2.0 <
Figure 112010020305443-pat00011
It is preferable to satisfy <2.2.

또한, 상기 대물렌즈(100) 선단면에서 상기 디스크(200)까지의 거리(OAL)는 2.5<

Figure 112010020305443-pat00012
<2.7을 만족하는 것이 바람직하다.In addition, the distance OAL from the front end surface of the objective lens 100 to the disk 200 is 2.5 <
Figure 112010020305443-pat00012
It is preferable to satisfy <2.7.

게다가, 상기 대물렌즈(100)는 굴절률(nd)이 1.50 <nd <1.55이고 아베(Abbe)수(vd)가 50<vd<60인 것이 바람직하다.In addition, the objective lens 100 preferably has a refractive index (nd) of 1.50 <nd <1.55 and an Abbe number (vd) of 50 <vd <60.

더불어, 본 발명의 고용량 광 픽업의 대물렌즈로 조사되는 광원은 파장 405nm의 청자색 레이저가 바람직하다.In addition, the light source irradiated with the objective lens of the high capacity optical pickup of the present invention is preferably a blue violet laser having a wavelength of 405 nm.

전술된 조건을 만족하지 못하는 대물렌즈를 구비한 광 픽업 광학계에서는 수차가 증가되어 대물렌즈의 광특성을 저하시키게 된다.In an optical pickup optical system having an objective lens that does not satisfy the above conditions, aberration is increased to deteriorate optical characteristics of the objective lens.

이하, 본 발명의 제 1 내지 3 실시예에 대하여 상세히 설명한다.Hereinafter, the first to third embodiments of the present invention will be described in detail.

상술된 조건에 만족하여, 대물렌즈(100)의 선단면의 sag값, 대물렌즈의 첫째면의 곡률반경 R1과, 둘째면의 곡률반경 R2를 하기 표 1과 같이 다르게 하여 제 1 내지 3 실시예를 제작하였다.The sag value of the front end surface of the objective lens 100, the radius of curvature R1 of the first surface of the objective lens, and the radius of curvature R2 of the second surface of the objective lens 100 are satisfied as described in Table 1 below. Was produced.

이로써, 본 발명의 제 1 내지 3 실시예의 광 픽업의 대물렌즈의 형상은 상호 다르나 0.1<

Figure 112010020305443-pat00013
<0.3을 만족하고, 곡률반경의 비율(R1/R2)도 상호 다르나 -0.75<
Figure 112010020305443-pat00014
<-0.65를 만족하여 제작되었다.
As a result, the shapes of the objective lenses of the optical pickups of the first to third embodiments of the present invention are different from each other.
Figure 112010020305443-pat00013
<0.3 is satisfied, and the ratio of the radius of curvature (R1 / R2) is also different from each other -0.75 <
Figure 112010020305443-pat00014
<-0.65 was satisfied.

제 1 실시예First Embodiment 제 2 실시예Second Embodiment 제 3 실시예Third Embodiment ff 1.411.41 1.411.41 1.411.41 NANA 0.850.85 0.850.85 0.850.85 작동거리Working distance 0.420.42 0.420.42 0.420.42 tt 1.751.75 1.751.75 1.751.75 sag1sag1 1.1391.139 1.1471.147 1.1361.136 sag1/tsag1 / t 0.6510.651 1.6561.656 0.6490.649 OAL/tOAL / t 1.2931.293 1.2931.293 1.2931.293 t/ft / f 1.2411.241 1.2411.241 1.2411.241 OALOAL 2.2622.262 2.2622.262 2.2652.265 OAL/fOAL / f 1.6041.604 1.6041.604 1.6041.604 ndnd 1.5091.509 1.5091.509 1.5091.509 vdvd 5656 5656 5656 R1R1 0.908340.90834 0.908220.90822 0.908420.90842 R2R2 -1.34237-1.34237 -1.34469-1.34469 -1.34085-1.34085 R1/R2R1 / R2 -0.68-0.68 -0.68-0.68 -0.68-0.68 (R2+R1)/(R2-R1)(R2 + R1) / (R2-R1) 0.1930.193 0.1940.194 0.1920.192 f/NAf / NA 1.6591.659 1.6591.659 1.6591.659 f/R1f / R1 1.5521.552 1.5521.552 1.5521.552 t/NAt / NA 2.0592.059 2.0592.059 2.0592.059 OAL/NAOAL / NA 2.6612.661 2.6612.661 2.6652.665

상기 제 1 실시예의 대물렌즈 및 디스크의 곡률반경, 두께, 굴절률(nd), 아베수(vd)는 표 2에 나타내었고, 표 3은 제 1 실시예의 대물렌즈의 선단면(S1)과 후단면(S2)의 비구면 계수이고, 표 4는 제 1 실시예의 대물렌즈에서 측정된 수차를 나타낸 것이다.(참고로, 표 4, 표 7 및 표 10의 단위는 waves RMS이다)The curvature radius, thickness, refractive index (nd), and Abbe number (vd) of the objective lens and the disk of the first embodiment are shown in Table 2, and Table 3 shows the front end surface (S1) and the rear end surface of the objective lens of the first embodiment. Aspheric coefficient of (S2), Table 4 shows the aberration measured in the objective lens of the first embodiment. (For reference, the unit of Table 4, Table 7 and Table 10 is waves RMS)

그러므로, 표 4와 같이, 본 발명의 제 1 실시예는 수차가 현저하게 감소되었음을 알 수 있다.Therefore, as shown in Table 4, the first embodiment of the present invention can be seen that the aberration is significantly reduced.

그리고, 도 2는 제 1 실시예의 구면 수차를 측정한 그래프이고, 도 3은 제 1 실시예의 비점수차를 측정한 그래프이다.
2 is a graph measuring spherical aberration of the first embodiment, and FIG. 3 is a graph measuring astigmatism of the first embodiment.

면번호(Si)Surface number (Si) RadiusRadius ThicknessThickness ndnd vdvd S1S1 0.908340.90834 1.5701.570 1.5091.509 5656 S2S2 -1.34237-1.34237 0.420.42 AirAir -- S3S3 InfinityInfinity 0.0920.092 1.6201.620 3030 ImageImage InfinityInfinity 00 -- --


S1
S1

KK A4A4 A6A6 A8A8 -0.689850-0.689850 0.352897E-010.352897E-01 0.115416E-010.115416E-01 0.157391E-010.157391E-01 A10A10 A12A12 A14A14 A16A16 -0.176564E-01-0.176564E-01 0.297655E-010.297655E-01 -0.195112E-01-0.195112E-01 0.609088E-020.609088E-02
S2
S2

KK A4A4 A6A6 A8A8 -29.213180-29.213180 0.334212E+000.334212E + 00 -0.675792E+00-0.675792E + 00 0.873420E+000.873420E + 00 A10A10 A12A12 A14A14 A16A16 -0.645155E+00-0.645155E + 00 0.203002E+000.203002E + 00 0.227085E-180.227085E-18 --

입사각angle of incidence 파면수차
Wavefront aberration
3차 수차3rd order aberration 5차 수차5th aberration 비점수차Astigmatism 코마coma 구면수차Spherical aberration 비점수차Astigmatism 코마coma 구면수차Spherical aberration on-axison-axis 0.0040.004 0.0000.000 0.0000.000 0.0000.000 0.0000.000 0.0000.000 0.0000.000 0.5°0.5 ° 0.0160.016 0.0110.011 0.0020.002 0.0110.011 0.0080.008 0.0000.000 0.0000.000

하기의 표 5는 상기 제 2 실시예의 대물렌즈 및 디스크의 곡률반경, 두께, 굴절률(nd), 아베수(vd)를 나타낸 것이고, 표 6은 제 2 실시예의 대물렌즈의 선단면(S1)과 후단면(S2)의 비구면 계수이고, 표 7는 제 2 실시예의 대물렌즈에서 측정된 수차를 나타낸 것으로, 본 발명의 제 2 실시예도 수차가 감소된 측정값을 보였다.Table 5 below shows the curvature radius, thickness, refractive index (nd), and Abbe's number (vd) of the objective lens and the disk of the second embodiment, and Table 6 shows the front end surface S1 of the objective lens of the second embodiment. Aspheric coefficient of the rear end surface (S2), Table 7 shows the aberration measured in the objective lens of the second embodiment, the second embodiment of the present invention also showed a reduced aberration measured value.

또, 도 5는 제 2 실시예의 구면 수차를 측정한 그래프이고, 도 6은 제 1 실시예의 비점수차를 측정한 그래프이다.
5 is a graph measuring spherical aberration of the second embodiment, and FIG. 6 is a graph measuring astigmatism of the first embodiment.

면번호(Si)Surface number (Si) RadiusRadius ThicknessThickness ndnd vdvd S1S1 0.908220.90822 1.7501.750 1.5091.509 5656 S2S2 -1.34469-1.34469 0.420.42 AirAir -- S3S3 InfinityInfinity 0.0920.092 1.6201.620 3030 ImageImage InfinityInfinity 00 -- --


S1
S1

KK A4A4 A6A6 A8A8 -0.708850-0.708850 0.391252E-010.391252E-01 0.128990E-010.128990E-01 0.131271E-010.131271E-01 A10A10 A12A12 A14A14 A16A16 -0.112522E-01-0.112522E-01 0.264296E-010.264296E-01 -0.215814E-01-0.215814E-01 0.812786E-020.812786E-02
S2
S2

KK A4A4 A6A6 A8A8 -30.243215-30.243215 0.328907E+000.328907E + 00 -0.676826E+00-0.676826E + 00 0.922120E+000.922120E + 00 A10A10 A12A12 A14A14 A16A16 -0.644498E+00-0.644498E + 00 0.785521E-010.785521E-01 0.901061E-010.901061E-01 --

입사각angle of incidence 파면수차
Wavefront aberration
3차 수차3rd order aberration 5차 수차5th aberration 비점수차Astigmatism 코마coma 구면수차Spherical aberration 비점수차Astigmatism 코마coma 구면수차Spherical aberration on-axison-axis 0.0070.007 0.0000.000 0.0000.000 -0.002-0.002 0.0000.000 0.0000.000 0.0020.002 0.5°0.5 ° 0.0180.018 0.0100.010 0.0020.002 0.0110.011 0.0100.010 0.0010.001 0.0010.001

표 8은 본 발명의 제 3 실시예의 대물렌즈 및 디스크의 곡률반경, 두께, 굴절률(nd), 아베수(vd)를 나타낸 것이고, 표 9는 제 3 실시예의 대물렌즈의 선단면(S1)과 후단면(S2)의 비구면 계수이고, 표 10은 제 3 실시예의 대물렌즈에서 측정된 수차로, 본 발명의 제 3 실시예의 대물렌즈에서도 수차는 양호한 값으로 측정되었다.Table 8 shows the curvature radius, thickness, refractive index (nd) and Abbe's number (vd) of the objective lens and the disk of the third embodiment of the present invention, and Table 9 shows the front end surface S1 of the objective lens of the third embodiment. Aspheric coefficient of the rear end surface S2, Table 10 is the aberration measured in the objective lens of the third embodiment, the aberration was also measured to a good value in the objective lens of the third embodiment of the present invention.

게다가, 도 8은 제 3 실시예의 구면 수차를 측정한 그래프이고, 도 9는 제 3 실시예의 비점수차를 측정한 그래프이다.
8 is a graph measuring spherical aberration of the third embodiment, and FIG. 9 is a graph measuring astigmatism of the third embodiment.

면번호(Si)Surface number (Si) RadiusRadius ThicknessThickness ndnd vdvd S1S1 0.908420.90842 1.7501.750 1.5091.509 5656 S2S2 -1.34085-1.34085 0.420.42 AirAir -- S3S3 InfinityInfinity 0.0920.092 1.6201.620 3030 ImageImage InfinityInfinity 00 -- --


S1
S1

KK A4A4 A6A6 A8A8 -0.693652-0.693652 0.358438E-010.358438E-01 0.120533E-010.120533E-01 0.150009E-010.150009E-01 A10A10 A12A12 A14A14 A16A16 -0.167733E-01-0.167733E-01 0.291202E-010.291202E-01 -0.192833E-01-0.192833E-01 0.598489E-020.598489E-02
S2
S2

KK A4A4 A6A6 A8A8 -29.181571-29.181571 0.332579E+000.332579E + 00 -0.681882E+00-0.681882E + 00 0.885491E+000.885491E + 00 A10A10 A12A12 A14A14 A16A16 -0.642318E+00-0.642318E + 00 0.181723E+000.181723E + 00 0.134771E-010.134771E-01 --

입사각angle of incidence 파면수차
Wavefront aberration
3차 수차3rd order aberration 5차 수차5th aberration 비점수차Astigmatism 코마coma 구면수차Spherical aberration 비점수차Astigmatism 코마coma 구면수차Spherical aberration on-axison-axis 0.0040.004 0.0000.000 0.0000.000 -0.002-0.002 0.0000.000 0.0000.000 0.0010.001 0.5°0.5 ° 0.0160.016 0.0110.011 0.0010.001 0.0130.013 0.0080.008 0.0020.002 0.0000.000

따라서, 본 발명의 광 픽업의 대물렌즈는 형상이 0.1<

Figure 112010020305443-pat00015
<0.3을 만족하고, 곡률반경의 비율은 -0.75<
Figure 112010020305443-pat00016
<-0.65를 만족하도록 설계되어, 전술된 제 1 내지 3 실시예의 대물렌즈와 같이, 수차를 감소시킬 수 있고, 도 4, 도 7 및 도 10과 같이, 광 픽업의 대물렌즈를 통하여 디스크에 결상된 광 상태도 양호한 것을 알 수 있다.Therefore, the objective lens of the optical pickup of the present invention has a shape of 0.1 <
Figure 112010020305443-pat00015
<0.3 is satisfied, and the ratio of the radius of curvature is -0.75 <
Figure 112010020305443-pat00016
Designed to satisfy <-0.65, it is possible to reduce aberration, as in the objective lenses of the first to third embodiments described above, and to image on the disc through the objective lens of the optical pickup, as shown in FIGS. 4, 7 and 10. It can be seen that the light state is also good.

참고로, 도 4, 도 7 및 도 10의 'A','C','E'는 제 1 내지 3 실시예의 대물렌즈에서 입사각이 0.5°인 경우 결상된 광 상태이고, 도 4, 도 7 및 도 10의 'A','B','F'는 제 1 내지 3 실시예의 대물렌즈에서 입사각이 on-axis인 경우 결상된 광 상태이다.
For reference, 'A', 'C' and 'E' in FIGS. 4, 7 and 10 are optical states formed when the incident angle is 0.5 ° in the objective lenses of the first to third embodiments, and FIGS. 4 and 7 And 'A', 'B', and 'F' in FIG. 10 are optical states formed when the incident angle is on-axis in the objective lenses of the first to third embodiments.

본 발명은 구체적인 예에 대해서만 상세히 설명되었지만 본 발명의 기술사상 범위 내에서 다양한 변형 및 수정이 가능함은 당업자에게 있어서 명백한 것이며, 이러한 변형 및 수정이 첨부된 특허청구범위에 속함은 당연한 것이다.
Although the invention has been described in detail only with respect to specific examples, it will be apparent to those skilled in the art that various modifications and variations are possible within the spirit of the invention, and such modifications and variations belong to the appended claims.

Claims (8)

고용량 광 픽업의 대물렌즈에 있어서,
상기 대물렌즈의 형상은 0.1<
Figure 112012048599305-pat00017
<0.3을 만족하고,
상기 대물렌즈의 초점거리 f는 1.5<
Figure 112012048599305-pat00036
<1.6를 만족하고,
상기 대물렌즈의 개구수 NA 및 상기 대물렌즈의 초점거리 f는 1.6<
Figure 112012048599305-pat00037
<1.7을 만족하고,
상기 대물렌즈 선단면에서 디스크까지의 거리(OAL) 및 상기 대물렌즈의 개구수 NA는 2.5<
Figure 112012048599305-pat00038
<2.7을 만족하고,
상기 대물렌즈는 굴절률(nd)이 1.50 <nd <1.55이고 아베(Abbe)수(vd)가 50<vd<60이며,
상기 대물렌즈는 2.0<
Figure 112012048599305-pat00039
<2.2를 만족하며, t는 상기 대물렌즈의 중심 두께이고, NA는 상기 대물렌즈의 개구수이고, 상기 대물렌즈의 첫째면의 곡률반경 R1이고, 둘째면의 곡률반경 R2인 것을 특징으로 하는 고용량 광 픽업용 대물렌즈.
In the objective lens of the high capacity optical pickup,
The shape of the objective lens is 0.1 <
Figure 112012048599305-pat00017
Satisfying <0.3,
The focal length f of the objective lens is 1.5 <
Figure 112012048599305-pat00036
<1.6,
The numerical aperture NA of the objective lens and the focal length f of the objective lens are 1.6 <
Figure 112012048599305-pat00037
Satisfying <1.7,
The distance OAL from the front end surface of the objective lens to the disk and the numerical aperture NA of the objective lens are 2.5 <
Figure 112012048599305-pat00038
<2.7
The objective lens has a refractive index (nd) of 1.50 <nd <1.55 and an Abbe number (vd) of 50 <vd <60,
The objective lens is 2.0 <
Figure 112012048599305-pat00039
<2.2, where t is the center thickness of the objective lens, NA is the numerical aperture of the objective lens, the radius of curvature R1 of the first surface of the objective lens, and the radius of curvature R2 of the second surface of the objective lens Objective lens for optical pickup.
삭제delete 삭제delete 삭제delete 삭제delete 삭제delete 삭제delete 청구항 1에 있어서,
상기 대물렌즈에 조사되는 광원은,
파장 405nm의 청자색 레이저인 것을 특징으로 하는 고용량 광 픽업용 대물렌즈.











The method according to claim 1,
The light source irradiated to the objective lens,
An objective lens for high capacity optical pickup, characterized by a blue violet laser with a wavelength of 405 nm.











KR1020100028654A 2010-03-30 2010-03-30 High capacity optical pick-up object lens KR101215272B1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003337281A (en) * 2002-05-17 2003-11-28 Minolta Co Ltd Objective lens for optical pickup
JP2007048374A (en) 2005-08-09 2007-02-22 Sony Corp Optical pickup and optical disk drive
KR100919139B1 (en) * 2007-11-19 2009-09-25 카바스(주) Optical pick-up an object lens

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003337281A (en) * 2002-05-17 2003-11-28 Minolta Co Ltd Objective lens for optical pickup
JP2007048374A (en) 2005-08-09 2007-02-22 Sony Corp Optical pickup and optical disk drive
KR100919139B1 (en) * 2007-11-19 2009-09-25 카바스(주) Optical pick-up an object lens

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