WO2016010264A1 - Optical pickup device - Google Patents

Optical pickup device Download PDF

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Publication number
WO2016010264A1
WO2016010264A1 PCT/KR2015/005852 KR2015005852W WO2016010264A1 WO 2016010264 A1 WO2016010264 A1 WO 2016010264A1 KR 2015005852 W KR2015005852 W KR 2015005852W WO 2016010264 A1 WO2016010264 A1 WO 2016010264A1
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Prior art keywords
beam splitter
optical
light
light source
optical disc
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PCT/KR2015/005852
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French (fr)
Korean (ko)
Inventor
김동호
박진태
안현구
김성호
김현정
김대현
문성규
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(주)아이엠
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Publication of WO2016010264A1 publication Critical patent/WO2016010264A1/en

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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
    • G11B7/1381—Non-lens elements for altering the properties of the beam, e.g. knife edges, slits, filters or stops

Definitions

  • the present invention relates to an optical-pickup device, and more particularly, to a tracking servo in a 1-beam type while applying an ASP element and removing a grating element, which is a spectroscopic element located between a light source and a beam splitter.
  • a structure-improved optical-pick-up device capable of performing a tracking servo.
  • Such a high-density recording medium may be exemplified by a technology using a Blu-ray Disc (BD) as a new disc format using a laser of 405 nm wavelength.
  • BD Blu-ray Disc
  • an optical pickup device having a series of optical systems is required.
  • the optical pickup apparatus reproduces information stored in the optical disk in a non-contact manner by using a semiconductor laser, wherein the optical pickup apparatus is not only an existing recording medium (eg CD or DVD) but also a new recording medium (eg Compatibility that can reproduce all the information stored in the BD) is required.
  • FIG. 1 is a block diagram showing an optical system of a general optical pickup device.
  • the optical-pickup apparatus is composed of a DVD / CD optical system 1 for reproducing an optical disc for DVD / CD and a BD optical system 20 for reproducing an optical disc for BD.
  • a light source 2 for irradiating light of a wavelength suitable for reproducing an optical disc for DVD / CD is configured.
  • a grating element (GT) 4 for diffracting the light irradiated from the light source 2 to form a 3-beam for detecting the tracking signal, and transmitting the light according to the polarization component of the divided light.
  • the beam splitter 6 is also configured to reflect or reflect toward the mirror 10. Further, the collimated lens 8 converts the beam reflected by the beam splitter 6 into parallel light, the mirror 10 reflects the parallel light vertically to the objective lens 12, and transmits the mirror 10. And an objective lens 12 for condensing the light to form spots on the optical disc 14 for DVD / CD.
  • an astigmatism lens 16 is provided between the beam splitter 6 and the photo detector 18 so that the light reflected from the optical disc 14 for DVD / CD can form a spot on the photo detector 18 accurately.
  • the optical system 20 for BD is also similar to the DVD / CD optical system 1 described above. That is, the configuration of the light source 21, the grating element 22, the beam splitter 24, the collimated lens 26, the mirror 28, the objective lens 32, the astigmatism lens 36, and the photodetector 38. It includes. However, the difference is that the mask 30 is further added between the objective lens 32 and the mirror 28. The mask 30 transmits the parallel light reflected by the mirror 28 to the objective lens 32.
  • astigmatism lenses 16 and 36 are used so that spots are accurately formed on the photodetectors 18 and 38.
  • cost reduction was difficult when using astigmatism lenses 16 and 36.
  • the unit price of the optical-pickup device could not be lowered, making it difficult to secure price competitiveness.
  • an object of the present invention is to solve the above problems, and to reduce the manufacturing cost by adopting a sensor plate instead of a sensor lens of the optical system structure of the optical pickup device.
  • Another object of the present invention is to perform the tracking servo operation equivalent to the conventional one-beam using the 1-beam while removing the grating element provided in the BD optical system to solve the sensitivity problem caused by adopting the sensor plate (ASP).
  • a first light source for irradiating light to reproduce a DVD optical disk or a CD optical disk for irradiating light to reproduce the BD optical disc
  • a second light source for irradiating light to reproduce the BD optical disc for irradiating light to reproduce the BD optical disc
  • a first beam splitter having a plate shape inclined at a predetermined angle to separate the incident light irradiated from the first light source and the reflected light reflected from the DVD optical disc or the CD optical disc
  • a second beam splitter having a cube shape separating the incident light irradiated from the second light source and the reflected light reflected from the BD optical disk
  • a mirror configured to transfer light emitted from the first beam splitter and the second beam splitter to an objective lens
  • a collimating lens and a quarter wave plate positioned on an optical path between the second beam splitter and the mirror
  • An optical detector for detecting light reflected from the DVD optical disc, CD optical disc or BD optical disc and converting an optical signal into an electrical
  • the ASP generates astigmatism in the 45 ° direction with the photodetector to perform focusing servo control.
  • the second light source performs tracking servo control in a one-beam manner.
  • the second light source irradiates the 1-beam and delivers it directly to the second beam splitter.
  • Such an optical-pickup device according to the present invention has the following effects.
  • the present invention applies a relatively inexpensive ASP instead of ASL to the light-receiving portion of the optical-pickup device.
  • the ASP is inclined at 45 ° so that the photodetector generates astigmatism corresponding thereto.
  • cost savings from ASL elimination can be expected.
  • the present invention eliminates the grating optical component elements that existed between the light source and the beam splitter to enable tracking servo control in a push-pull method using a 1-beam in the BD optical system structure of the optical pickup device.
  • the grating device was removed from the BD optical system to solve the sensitivity problem caused by the use of ASP.
  • the conventional grating optical component element can be used to provide an effect equivalent to the three-beam tracking servo function. Therefore, the effect of improving the productivity in the manufacturing process can be expected due to the removal of the reliable component element.
  • 1 is a block diagram showing the structure of an optical system of a general optical pickup device
  • FIG 2 is an overall configuration diagram of the optical-pickup device of the present invention
  • FIG. 3 is a block diagram illustrating a structure of a DVD / CD optical system and a signal processing process in the optical-pickup apparatus of FIG.
  • FIG. 4 is a block diagram illustrating a BD optical system structure and a signal processing process in the optical-pickup apparatus of FIG.
  • the present invention provides astigmatism by installing an ASP to have an inclination angle of 40 to 50 ° in a light receiving portion of an optical pickup device, and also implements a tracking servo with a 1-beam while removing a grating element in a BD optical system. Make a point.
  • FIG 2 is an overall configuration diagram of the optical-pickup device of the present invention.
  • the optical-pick-up apparatus 100 includes a DVD / CD light source (first light source) 102 and a BD light source that irradiate light suitable for reproducing an optical disc for DVD / CD or an optical disc for BD.
  • Second light source 104 is configured.
  • a first beam splitter 103 and a second beam splitter 105 which separate the incident light and the reflected light irradiated from the first light source 102 or the second light source 104, and the optical disk to record or reproduce the information. It includes an objective lens 112 for focusing to form a spot.
  • the first beam splitter 103 and the second beam splitter 105 change the traveling direction of the light so as to reflect the light emitted from the first light source 102 and the second light source 104 toward the objective lens. It serves to transmit the light reflected from the optical disk back to the photo detector 130.
  • the first beam splitter 103 has a plate shape and the second beam splitter 105 has a cube shape. These are used to selectively reflect only a light source of a specific wavelength among the first light source 102 and the second light source 104 to be formed on the optical disk.
  • the grating element may be located.
  • the grating element can be removed depending on how the tracking servo is implemented.
  • the mirror 110 is configured on the optical path for transmitting the light reflected by the first beam splitter 103 and the second beam splitter 105 to the objective lens 112.
  • a quarter wave plate (QWP) 108 is constructed.
  • the quarter wave plate 108 serves to cause the wavelength of the incident wave to undergo a quarter-wave phase shift, and converts linearly polarized light into circularly polarized light using birefringence, and conversely, converts circularly polarized light into linearly polarized light. It is an optical component.
  • incident light that has been circularly polarized through the quarter wave plate 108 is reflected by the optical disk, and its direction is opposite to that when it is incident.
  • the reflected light in the optical disk becomes the polarization of the circle rotating in reverse, passes through the quarter wave plate 108 and changes into linearly polarized light. Therefore, the polarization component of the light incident on the quarter wave plate 108 and the polarization component of light reflected by the optical disk again and transmitted through the quarter wave plate 108 are 180 degrees different.
  • the grating element is removed between the second light source 104 and the second beam splitter 105.
  • a tracking servo is performed with 1-beams.
  • a photo detector (PDIC) 130 which is a light receiving element for detecting the light reflected from the optical disk and converts the optical signal into an electrical signal.
  • PDIC photo detector
  • an ASP 120 which is an optical system emitting component, is configured between the first beam splitter 103 and the photo detector 130 for a focusing servo.
  • a relatively inexpensive ASP device is used instead of the conventional lens type ASL.
  • the ASP 120 is configured to be inclined at approximately 40 to 50 degrees, precisely 45 degrees, so that the photodetector 130 performs a focusing servo by making an astigmatism of 45 degrees.
  • FIG. 3 is a block diagram illustrating a structure of a DVD / CD optical system and a signal processing process in the optical-pickup apparatus of FIG. 2.
  • the first light source 102 irradiates light of a wavelength suitable for reproducing a DVD / CD optical disc.
  • the irradiated light is then reflected by the first beam splitter 103 and transmitted to the collimated lens 106 through the second beam splitter 105.
  • Reflected light is converted into parallel light by the collimated lens 106 and transmitted to the mirror 110 through the quarter wave plate 108.
  • the mirror 110 reflects the parallel light vertically to the objective lens 112, and the objective lens 112 focuses the transmitted light to form a spot.
  • the light reflected from the optical disk is transmitted to the photo detector 130 in a direction opposite to the above-described traveling direction. That is, the light reflected from the optical disk is reflected in the mirror 110, the quarter wave plate 108, the collimated lens 106, the second beam splitter 105 and the first beam splitter 103, and the ASP 120. Passes through and enters the photodetector 130. At this time, since the ASP 120 is inclined at approximately 40 to 50 °, the photodetector 130 generates astigmatism with a 45 ° tilt to perform the focusing servo.
  • FIG. 4 is a block diagram illustrating a BD optical system structure and a signal processing process in the optical-pickup device of FIG. 2.
  • the second light source 104 irradiates light of a wavelength suitable for reproducing the BD optical disk.
  • the irradiated light is then incident on the second beam splitter 105.
  • the second beam splitter 105 transmits the incident light to the mirror 110 through the collimating lens 106 and the quarter wave plate 108.
  • the mirror 110 transmits the transmitted light to the objective lens 112, and the objective lens 112 focuses the transmitted light to form a spot.
  • the tracking servo method uses a 1-beam push-pull method. That is, in the related art, the tracking servo is performed by using the 3-beam due to the grating element.
  • the grating element that splits the light emitted from the second light source to form the 3-beam may include a second light source ( This is because it was removed on the optical path between 104 and the second beam splitter 105.
  • the grating device forms the BD optical system structure from which the grating device is removed.
  • the light reflected from the optical disk is incident to the photo detector 130 through the same path as described in the DVD / CD optical system.
  • the photodetector 130 since the ASP 120 positioned at the front of the photodetector 130 is inclined at approximately 40 to 50 degrees, the photodetector 130 generates astigmatism of 45 degrees and performs focusing servo.
  • the present embodiment uses a relatively inexpensive ASP instead of ASL used in the optical system of the optical pickup device, and removes the grating element that splits the light emitted from the light source in the BD optical system to improve the structure. You can see that the pickup device is configured.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Head (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

The present invention provides an optical pickup device carrying out a focusing servo by applying an ASP disposed to be inclined to an optical system of the optical pickup device so as to generate astigmatism, and having an improved structure in which a BD optical system carries out a tracking servo with a 1-beam method while removing a grating optical component between a light source and a beam splitter.

Description

광- 픽업 장치Optical-pickup device
본 발명은 광-픽업 장치에 관한 것으로서, 더욱 상세하게는 ASP 소자를 적용하고, 광원과 빔 스프리터 사이에 위치한 분광소자인 그레이팅(grating) 소자를 제거하면서 1-빔(beam) 형식으로 트랙킹 서보(tracking servo)를 수행할 수 있도록 한 구조 개선된 광- 픽업 장치에 관한 것이다. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical-pickup device, and more particularly, to a tracking servo in a 1-beam type while applying an ASP element and removing a grating element, which is a spectroscopic element located between a light source and a beam splitter. A structure-improved optical-pick-up device capable of performing a tracking servo.
알려진 바와 같이 CD(Compact Disc) 및 DVD(Digital Versatile Disc)와 같은 기록매체보다 기록 용량을 더욱 높인 고밀도 기록매체에 대한 연구가 활발하다. 이러한 고밀도 기록매체로는 405nm의 파장대의 레이저를 사용하는 신규 디스크 포맷으로 블루레이 디스크(BD)를 이용한 기술을 예를 들 수 있다. As is known, studies on high-density recording media with higher recording capacities than recording media such as compact discs (CDs) and digital versatile discs (DVDs) are active. Such a high-density recording medium may be exemplified by a technology using a Blu-ray Disc (BD) as a new disc format using a laser of 405 nm wavelength.
그리고 상기한 기록매체에 정보를 기록하거나 기록된 정보를 재생하기 위해서는 일련의 광학계가 구비된 광 픽업 장치가 필요하다. 상기 광 픽업 장치는 반도체 레이저를 이용하여 비-접촉 방식으로 광디스크에 저장되어 있는 정보를 재생하는 장치로서, 이때 광 픽업 장치는 기존의 기록매체(예컨대, CD나 DVD)뿐만 아니라 새로운 기록매체(예컨대 BD)에 저장된 정보를 모두 재생할 수 있는 호환성이 요구된다. In order to record information on the recording medium or to reproduce the recorded information, an optical pickup device having a series of optical systems is required. The optical pickup apparatus reproduces information stored in the optical disk in a non-contact manner by using a semiconductor laser, wherein the optical pickup apparatus is not only an existing recording medium (eg CD or DVD) but also a new recording medium (eg Compatibility that can reproduce all the information stored in the BD) is required.
이를 위한 방법으로 상이한 광학계를 설치하고, 전용 대물 렌즈를 사용 파장마다 전환하는 방법이 있고, 도 1을 참조하여 설명한다. 도 1은 일반적인 광-픽업 장치의 광학계를 나타낸 구성도이다. As a method for this, there is a method in which different optical systems are provided and a dedicated objective lens is switched for each wavelength of use, which will be described with reference to FIG. 1. 1 is a block diagram showing an optical system of a general optical pickup device.
이를 보면, 광-픽업 장치는 DVD/CD용 광 디스크를 재생하기 위한 DVD/CD 광학계(1)와 BD용 광 디스크를 재생하기 위한 BD 광학계(20)로 구성된다. In this regard, the optical-pickup apparatus is composed of a DVD / CD optical system 1 for reproducing an optical disc for DVD / CD and a BD optical system 20 for reproducing an optical disc for BD.
먼저 DVD/CD 광학계(1) 구조를 살펴본다.First, the structure of the DVD / CD optical system 1 will be described.
DVD/CD용 광 디스크를 재생하는데 적합한 파장의 광을 조사하는 광원(2)이 구성된다. 그리고 광원(2)에서 조사되는 광을 회절시켜 트랙킹 신호 검출을 위한 3-빔(beam)을 형성할 수 있도록 분할하는 그레이팅 소자(GT)(4), 상기 분할된 광의 편광 성분에 따라 광을 투과시키거나 미러(10) 쪽으로 반사시키는 빔 스플리터(6)도 구성된다. 또한 빔 스플리터(6)에 의해 반사된 빔을 평행광으로 변환하는 콜리메이트 렌즈(8), 상기 평행광을 대물렌즈(12)로 수직하게 반사하는 미러(10), 미러(10)를 통해 전송된 광을 집속하여 DVD/CD용 광디스크(14)에 스폿(spot)을 형성하는 대물렌즈(12)를 포함한다. A light source 2 for irradiating light of a wavelength suitable for reproducing an optical disc for DVD / CD is configured. And a grating element (GT) 4 for diffracting the light irradiated from the light source 2 to form a 3-beam for detecting the tracking signal, and transmitting the light according to the polarization component of the divided light. The beam splitter 6 is also configured to reflect or reflect toward the mirror 10. Further, the collimated lens 8 converts the beam reflected by the beam splitter 6 into parallel light, the mirror 10 reflects the parallel light vertically to the objective lens 12, and transmits the mirror 10. And an objective lens 12 for condensing the light to form spots on the optical disc 14 for DVD / CD.
아울러 빔 스플리터(6)와 광 검출기(18) 사이에 설치되어 DVD/CD용 광디스크(14)에서 반사된 광이 광 검출기(18)에 스폿이 정확히 맺히도록 하는 비점수차 렌즈(16)가 구성된다. In addition, an astigmatism lens 16 is provided between the beam splitter 6 and the photo detector 18 so that the light reflected from the optical disc 14 for DVD / CD can form a spot on the photo detector 18 accurately. .
다음 BD용 광학계(20) 구조를 살펴본다. Next, the structure of the optical system 20 for BD will be described.
BD용 광학계(20) 구조 역시 상기한 DVD/CD 광학계(1) 구조와 유사하다. 즉 광원(21), 그레이팅 소자(22), 빔 스플리터(24), 콜리메이트 렌즈(26), 미러(28), 대물렌즈(32), 비점수차 렌즈(36), 광 검출기(38)의 구성을 포함한다. 다만, 차이점으로는 대물렌즈(32)와 미러(28) 사이에 마스크(30)가 더 추가된 구성이다. 마스크(30)는 미러(28)에 의해 반사된 평행광을 대물렌즈(32)에 전달하는 역할을 한다. The optical system 20 for BD is also similar to the DVD / CD optical system 1 described above. That is, the configuration of the light source 21, the grating element 22, the beam splitter 24, the collimated lens 26, the mirror 28, the objective lens 32, the astigmatism lens 36, and the photodetector 38. It includes. However, the difference is that the mask 30 is further added between the objective lens 32 and the mirror 28. The mask 30 transmits the parallel light reflected by the mirror 28 to the objective lens 32.
이와 같이 종래 광-픽업 장치의 광학계 구조에서는 광 검출기(18)(38)에 스폿이 정확히 맺히도록 비점수차 렌즈(16)(36)를 사용하고 있다. 그러나 비점수차 렌즈(16)(36)를 사용할 경우 비용 절감이 어려웠다. 결국 광-픽업 장치의 생산 단가를 낮출 수 없어 가격 경쟁력 확보에 어려움이 있었다.As described above, in the optical system structure of the conventional optical pickup apparatus, astigmatism lenses 16 and 36 are used so that spots are accurately formed on the photodetectors 18 and 38. However, cost reduction was difficult when using astigmatism lenses 16 and 36. As a result, the unit price of the optical-pickup device could not be lowered, making it difficult to secure price competitiveness.
또한 종래 광-픽업 장치에는 트랙킹 서보의 경우 3-빔을 이용한 DPP 방법이 사용되었다. 그러나 상기 방법은 제조공정이 복잡하였고 이로 인해 생산성이 저하되는 문제가 초래되었다. In addition, in the conventional optical-pickup apparatus, a DPP method using a 3-beam in the case of tracking servo has been used. However, the method has a complicated manufacturing process, which leads to a problem of lowering productivity.
따라서 본 발명의 목적은 상기한 문제점을 해결하기 위한 것으로, 광-픽업 장치의 광학계 구조 중 센서 렌즈 대신 센서 플레이트를 채택하여 제조 단가를 절감하도록 한 것이다. Therefore, an object of the present invention is to solve the above problems, and to reduce the manufacturing cost by adopting a sensor plate instead of a sensor lens of the optical system structure of the optical pickup device.
본 발명의 다른 목적은, 센서 플레이트(ASP)를 채택함으로써 발생하는 민감도 문제를 해결하고자 BD 광학계에 구비된 그레이팅 소자를 제거하면서 1-빔을 이용하여 기존과 동등한 트랙킹 서보 동작을 수행하도록 하는 것이다. Another object of the present invention is to perform the tracking servo operation equivalent to the conventional one-beam using the 1-beam while removing the grating element provided in the BD optical system to solve the sensitivity problem caused by adopting the sensor plate (ASP).
상기한 목적을 달성하기 위한 본 발명의 특징에 따르면, DVD 광 디스크 또는 CD 광디스크를 재생하도록 광을 조사하는 제1 광원; BD 광 디스크를 재생하도록 광을 조사하는 제2 광원; 상기 제1 광원에서 조사된 입사광과 상기 DVD 광 디스크 또는 CD 광 디스크에서 반사된 반사광을 분리하도록 소정 각도로 경사지면서 위치하는 플레이트 형상인 제1 빔 스플리터; 상기 제2 광원에서 조사된 입사광과 상기 BD 광 디스크에서 반사된 반사광을 분리하는 정육면체 형상인 제2 빔 스플리터; 상기 제1 빔 스플리터와 상기 제2 빔 스플리터에서 조사된 광을 대물렌즈로 전달하는 미러; 상기 제2 빔 스플리터와 상기 미러 사이의 광 경로상에 위치하는 콜리메이트 렌즈 및 1/4 파장판; 상기 DVD 광 디스크, CD 광 디스크 또는 BD 광 디스크에서 반사된 광을 검출하여 광학적 신호를 전기적 신호로 변환하는 광 검출기; 및 상기 광 검출기와 상기 제1 빔 스플리터 사이에 위치하면서 상기 제1 빔 스플리터의 경사 각도와 동일한 각도로 기울어지며 상기 제1 빔 스플리터의 크기보다 작게 형성되는 ASP을 포함하는 광-픽업 장치를 제공한다.According to a feature of the present invention for achieving the above object, a first light source for irradiating light to reproduce a DVD optical disk or a CD optical disk; A second light source for irradiating light to reproduce the BD optical disc; A first beam splitter having a plate shape inclined at a predetermined angle to separate the incident light irradiated from the first light source and the reflected light reflected from the DVD optical disc or the CD optical disc; A second beam splitter having a cube shape separating the incident light irradiated from the second light source and the reflected light reflected from the BD optical disk; A mirror configured to transfer light emitted from the first beam splitter and the second beam splitter to an objective lens; A collimating lens and a quarter wave plate positioned on an optical path between the second beam splitter and the mirror; An optical detector for detecting light reflected from the DVD optical disc, CD optical disc or BD optical disc and converting an optical signal into an electrical signal; And an ASP positioned between the photo detector and the first beam splitter and inclined at an angle equal to the inclination angle of the first beam splitter and smaller than the size of the first beam splitter. .
상기 ASP는 상기 광 검출기와 45°방향으로 비점수차를 생성하여 포커싱 서보 제어를 수행한다. The ASP generates astigmatism in the 45 ° direction with the photodetector to perform focusing servo control.
상기 제2 광원은, 1-빔 방식으로 트랙킹 서보 제어를 수행한다.The second light source performs tracking servo control in a one-beam manner.
상기 제2 광원은 1-빔을 조사하여 상기 제2 빔 스플리터로 직접 전달한다.The second light source irradiates the 1-beam and delivers it directly to the second beam splitter.
이와 같은 본 발명에 따른 광-픽업 장치는 다음과 같은 효과가 있다. Such an optical-pickup device according to the present invention has the following effects.
본 발명은 광-픽업 장치의 수광부에 ASL 대신 상대적으로 가격이 저렴한 ASP를 적용하였고, 이때 ASP를 45°경사지게 배치하여 광 검출기가 그에 대응되는 비점수차를 생성하도록 하고 있다. 이에 ASL 제거로 인한 원가 절감 효과를 기대할 수 있다. The present invention applies a relatively inexpensive ASP instead of ASL to the light-receiving portion of the optical-pickup device. At this time, the ASP is inclined at 45 ° so that the photodetector generates astigmatism corresponding thereto. Thus, cost savings from ASL elimination can be expected.
또한, 본 발명은 광-픽업 장치의 BD 광학계 구조에서 1-빔을 이용한 푸쉬-풀 방식으로 트랙킹 서보 제어를 할 수 있도록 광원과 빔 스플리터 사이에 존재했던 그레이팅 광학 부품 소자를 제거하였다. 즉 ASP 사용으로 인해 발생할 수 있는 민감도 문제를 해결하고자 BD 광학계에서 그레이팅 소자를 제거하였다. 이렇게 하더라도 종래 그레이팅 광학 부품 소자를 사용하여 3-빔을 이용한 트랙킹 서보 기능과 동등한 효과를 제공할 수 있다. 따라서 신뢰성 부품 소자의 제거로 인하여 제조 공정에서의 생산성을 향상시킬 수 있는 효과도 기대할 수 있다.In addition, the present invention eliminates the grating optical component elements that existed between the light source and the beam splitter to enable tracking servo control in a push-pull method using a 1-beam in the BD optical system structure of the optical pickup device. In other words, the grating device was removed from the BD optical system to solve the sensitivity problem caused by the use of ASP. Even with this, the conventional grating optical component element can be used to provide an effect equivalent to the three-beam tracking servo function. Therefore, the effect of improving the productivity in the manufacturing process can be expected due to the removal of the reliable component element.
도 1은 일반적인 광-픽업 장치의 광학계 구조를 보인 구성도1 is a block diagram showing the structure of an optical system of a general optical pickup device
도 2는 본 발명의 광-픽업 장치의 전체 구성도2 is an overall configuration diagram of the optical-pickup device of the present invention;
도 3은 도 2의 광-픽업 장치에서 DVD/CD 광학계 구조 및 신호 처리과정을 설명하기 위한 구성도3 is a block diagram illustrating a structure of a DVD / CD optical system and a signal processing process in the optical-pickup apparatus of FIG.
도 4는 도 2의 광-픽업 장치에서 BD 광학계 구조 및 신호 처리 과정을 설명하기 위한 구성도4 is a block diagram illustrating a BD optical system structure and a signal processing process in the optical-pickup apparatus of FIG.
본 발명은 광-픽업 장치의 수광부에 40 ~ 50°의 경사각을 가지도록 ASP를 설치하여 비점수차를 형성하며, 아울러 BD 광학계에서는 그레이팅 소자를 제거하면서 1-빔으로 트랙킹 서보를 구현함을 기본적인 기술적 요지로 한다. The present invention provides astigmatism by installing an ASP to have an inclination angle of 40 to 50 ° in a light receiving portion of an optical pickup device, and also implements a tracking servo with a 1-beam while removing a grating element in a BD optical system. Make a point.
이하 본 발명에 의한 광-픽업 장치의 바람직한 실시 예를 첨부된 도면을 참조하여 상세하게 설명한다. Hereinafter, exemplary embodiments of an optical-pickup device according to the present invention will be described in detail with reference to the accompanying drawings.
도 2는 본 발명의 광-픽업 장치의 전체 구성도이다. 2 is an overall configuration diagram of the optical-pickup device of the present invention.
도 2에 도시된 바와 같이 광-픽업 장치(100)에는 DVD/CD용 광 디스크 또는 BD용 광 디스크를 재생하도록 적합한 광을 조사하는 DVD/CD 광원(제1 광원)(102) 및 BD 광원(제2 광원)(104)이 구성된다. As shown in Fig. 2, the optical-pick-up apparatus 100 includes a DVD / CD light source (first light source) 102 and a BD light source that irradiate light suitable for reproducing an optical disc for DVD / CD or an optical disc for BD. Second light source 104 is configured.
그리고 제1 광원(102) 또는 제2 광원(104)에서 조사된 입사광과 반사광을 분리하는 제1 빔 스플리터(103) 및 제2 빔 스플리터(105), 정보의 기록 또는 재생을 위해 광 디스크에 광을 집속시켜 스폿을 형성하는 대물렌즈(112)를 포함한다. And a first beam splitter 103 and a second beam splitter 105 which separate the incident light and the reflected light irradiated from the first light source 102 or the second light source 104, and the optical disk to record or reproduce the information. It includes an objective lens 112 for focusing to form a spot.
여기서 제1 빔 스플리터(103) 및 제2 빔 스플리터(105)는 제1 광원(102) 및 제2 광원(104)에서 조사된 광을 반사시켜 대물렌즈 쪽으로 향하도록 광의 진행방향을 변경해주고, 또한 광 디스크에서 반사되어 돌아오는 광을 광 검출기(130) 방향으로 투과시키는 역할을 한다. 이때 제1 빔 스플리터(103)는 플레이트(plate) 형상이고 제2 빔 스플리터(105)는 정육면체 형상이다. 이들은 제1 광원(102)과 제2 광원(104) 중 특정 파장의 광원만을 선택적으로 반사하여 광 디스크에 맺히도록 하기 위해 사용된다.Here, the first beam splitter 103 and the second beam splitter 105 change the traveling direction of the light so as to reflect the light emitted from the first light source 102 and the second light source 104 toward the objective lens. It serves to transmit the light reflected from the optical disk back to the photo detector 130. In this case, the first beam splitter 103 has a plate shape and the second beam splitter 105 has a cube shape. These are used to selectively reflect only a light source of a specific wavelength among the first light source 102 and the second light source 104 to be formed on the optical disk.
한편, 상기 제1 광원(102)과 제1 빔 스플리터(103) 사이에는 제1 광원(102)에서 조사되는 광을 회절시켜 트랙킹 신호 검출을 위한 3-빔(beam)을 형성할 수 있도록 분할하는 그레이팅 소자가 위치할 수 있다. 물론 그레이팅 소자는 트랙킹 서보의 구현 방식에 따라 제거되는 것도 가능하다.On the other hand, between the first light source 102 and the first beam splitter 103 to split the light emitted from the first light source 102 to form a three-beam (beam) for detecting the tracking signal The grating element may be located. Of course, the grating element can be removed depending on how the tracking servo is implemented.
그리고 제1 빔 스플리터(103) 및 제2 빔 스플리터(105)에서 반사된 광을 대물렌즈(112) 측으로 전달시키는 광 경로상에는 미러(110)가 구성된다. The mirror 110 is configured on the optical path for transmitting the light reflected by the first beam splitter 103 and the second beam splitter 105 to the objective lens 112.
또한 제2 빔 스플리터(105)와 미러(110) 사이의 광 경로상에는 상기한 빔 스플리터(103)(105)에 의해 반사된 빔을 평행광으로 변환하는 콜리메이트 렌즈(collimate lens)(106) 및 1/4 파장판(Quoter Wave Plate, QWP)(108)이 구성된다. 1/4 파장판(108)은 입사되는 파의 파장이 1/4파장 위상 변화가 일어나게 하는 역할을 하며 복굴절을 이용하여 직선편광을 원편광으로 변환하기도 하고, 반대로 원편광을 직선편광으로 변환하기도 하는 광학부품이다. 따라서 1/4 파장판(108)을 통과하여 원편광이 된 입사광은 광 디스크에 의해 반사되며, 방향은 입사할 때와 반대가 된다. 그러므로 광 디스크에서의 반사광은 역회전하는 원의 편파가 되어 1/4 파장판(108)을 통과하고 직선편광으로 변화한다. 따라서, 1/4 파장판(108)에 입사하는 광의 편광 성분과 다시 광 디스크에서 반사되어 1/4 파장판(108)을 투과한 광의 편광 성분은 180˚ 다르다. In addition, on the optical path between the second beam splitter 105 and the mirror 110, a collimate lens 106 for converting the beam reflected by the beam splitter 103, 105 into parallel light; A quarter wave plate (QWP) 108 is constructed. The quarter wave plate 108 serves to cause the wavelength of the incident wave to undergo a quarter-wave phase shift, and converts linearly polarized light into circularly polarized light using birefringence, and conversely, converts circularly polarized light into linearly polarized light. It is an optical component. Thus, incident light that has been circularly polarized through the quarter wave plate 108 is reflected by the optical disk, and its direction is opposite to that when it is incident. Therefore, the reflected light in the optical disk becomes the polarization of the circle rotating in reverse, passes through the quarter wave plate 108 and changes into linearly polarized light. Therefore, the polarization component of the light incident on the quarter wave plate 108 and the polarization component of light reflected by the optical disk again and transmitted through the quarter wave plate 108 are 180 degrees different.
상기한 구성을 보면, 제2 광원(104)과 제2 빔 스플리터(105) 사이에는 그레이팅 소자가 제거되었음을 알 수 있다. 따라서 3-빔으로 트랙킹 서보를 수행하는 것이 아니고 1-빔으로 트랙킹 서보를 수행하게 된다. In the above configuration, it can be seen that the grating element is removed between the second light source 104 and the second beam splitter 105. Thus, instead of performing a tracking servo with 3-beams, a tracking servo is performed with 1-beams.
한편, 광 디스크로부터 반사되어 온 광을 검출하여 광학적 신호를 전기적 신호로 변환하는 수광소자인 광 검출기(PDIC)(130)를 포함한다. 이때 본 실시 예에 따르면, 제1 빔 스플리터(103)와 광 검출기(130) 사이에는 포커싱 서보(Focusing servo)를 위해 광학계 송출부품인 ASP(120)가 구성된다. 즉 종래 렌즈 타입의 ASL 대신 상대적으로 저가인 ASP 소자를 사용하는 것이다. 이때 광 검출기(130)가 45°기울인 비점수차를 만들어 포커싱 서보를 수행하도록 ASP(120)는 대략 40 ~ 50 °정도, 정확하게는 45°경사지게 구성한다.On the other hand, it includes a photo detector (PDIC) 130 which is a light receiving element for detecting the light reflected from the optical disk and converts the optical signal into an electrical signal. In this case, according to the present embodiment, an ASP 120, which is an optical system emitting component, is configured between the first beam splitter 103 and the photo detector 130 for a focusing servo. In other words, a relatively inexpensive ASP device is used instead of the conventional lens type ASL. At this time, the ASP 120 is configured to be inclined at approximately 40 to 50 degrees, precisely 45 degrees, so that the photodetector 130 performs a focusing servo by making an astigmatism of 45 degrees.
다음에는 DVD/CD 광학계와 BD 광학계에 따른 신호 처리과정을 설명하기로 한다. 이는 도 3 및 도 4를 참조한다. Next, signal processing according to the DVD / CD optical system and the BD optical system will be described. This is referred to FIGS. 3 and 4.
먼저 DVD/CD 광학계는 도 3을 참조한다. 도 3은 도 2의 광-픽업 장치에서 DVD/CD 광학계 구조 및 신호 처리과정을 설명하기 위한 구성도이다. First, the DVD / CD optical system refers to FIG. 3. FIG. 3 is a block diagram illustrating a structure of a DVD / CD optical system and a signal processing process in the optical-pickup apparatus of FIG. 2.
이를 보면, 제1 광원(102)이 DVD/CD 광 디스크를 재생하는데 적합한 파장의 광을 조사한다. 이후 조사된 광은 제1 빔 스플리터(103)에서 반사되어 제2 빔 스플리터(105)를 통해 콜리메이트 렌즈(106)로 전달된다. 콜리메이트 렌즈(106)에 의해 반사 광은 평행광으로 변환되고, 1/4 파장판(108)을 투과해서 미러(110)로 전달된다. 그러면 미러(110)는 상기 평행광을 수직되게 반사하여 대물 렌즈(112)로 보내고, 대물 렌즈(112)는 전송된 광을 집속하여 스폿(spot)을 형성한다. In view of this, the first light source 102 irradiates light of a wavelength suitable for reproducing a DVD / CD optical disc. The irradiated light is then reflected by the first beam splitter 103 and transmitted to the collimated lens 106 through the second beam splitter 105. Reflected light is converted into parallel light by the collimated lens 106 and transmitted to the mirror 110 through the quarter wave plate 108. Then, the mirror 110 reflects the parallel light vertically to the objective lens 112, and the objective lens 112 focuses the transmitted light to form a spot.
한편 광 디스크에서 반사된 광은 상기한 진행 방향과 반대 방향을 통해 광 검출기(130)로 전달된다. 즉 광 디스크에서 반사된 광은 미러(110), 1/4 파장판(108), 콜리메이트 렌즈(106), 제2 빔 스플리터(105) 및 제1 빔 스플리터(103), 그리고 ASP(120)를 통과하여 광 검출기(130)에 입사된다. 이때 ASP(120)는 대략 40 ~ 50°로 경사져서 위치하고 있기 때문에, 광 검출기(130)는 45°기울인 비점수차를 생성하여 포커싱 서보를 수행하게 된다. On the other hand, the light reflected from the optical disk is transmitted to the photo detector 130 in a direction opposite to the above-described traveling direction. That is, the light reflected from the optical disk is reflected in the mirror 110, the quarter wave plate 108, the collimated lens 106, the second beam splitter 105 and the first beam splitter 103, and the ASP 120. Passes through and enters the photodetector 130. At this time, since the ASP 120 is inclined at approximately 40 to 50 °, the photodetector 130 generates astigmatism with a 45 ° tilt to perform the focusing servo.
다음 BD 광학계는 도 4를 참조한다. 도 4는 도 2의 광-픽업 장치에서 BD 광학계 구조 및 신호 처리 과정을 설명하기 위한 구성도이다. The next BD optical system refers to FIG. 4. FIG. 4 is a block diagram illustrating a BD optical system structure and a signal processing process in the optical-pickup device of FIG. 2.
제2 광원(104)은 BD 광 디스크를 재생하는데 적합한 파장의 광을 조사한다. The second light source 104 irradiates light of a wavelength suitable for reproducing the BD optical disk.
그러면 조사된 광은 제2 빔 스플리터(105)로 입사된다. 그리고 제2 빔 스플리터(105)는 입사된 광을 콜리메이트 렌즈(106) 및 1/4 파장판(108)을 투과해서 미러(110)로 전달한다. 이에 미러(110)는 전달된 광을 대물 렌즈(112)로 보내고, 대물 렌즈(112)는 전송된 광을 집속하여 스폿(spot)을 형성한다. The irradiated light is then incident on the second beam splitter 105. The second beam splitter 105 transmits the incident light to the mirror 110 through the collimating lens 106 and the quarter wave plate 108. The mirror 110 transmits the transmitted light to the objective lens 112, and the objective lens 112 focuses the transmitted light to form a spot.
이때 트랙킹 서보 방식은 1-빔, 즉 푸쉬 풀(push-pull) 방식을 이용하게 된다. 즉, 종래에는 그레이팅 소자로 인해 3-빔을 이용하여 트랙킹 서보를 수행하였지만, 본 실시 예에 따르면 3-빔을 형성할 수 있도록 제2 광원에서 조사되는 광을 분할하는 그레이팅 소자를 제2 광원(104)과 제2 빔 스플리터(105) 사이의 광 경로상에서 제거하였기 때문이다. In this case, the tracking servo method uses a 1-beam push-pull method. That is, in the related art, the tracking servo is performed by using the 3-beam due to the grating element. However, according to the present exemplary embodiment, the grating element that splits the light emitted from the second light source to form the 3-beam may include a second light source ( This is because it was removed on the optical path between 104 and the second beam splitter 105.
이처럼 본 실시 예에 따르면 그레이팅 소자가 제거된 BD 광학계 구조를 구성함을 알 수 있다. As such, according to the present embodiment, it can be seen that the grating device forms the BD optical system structure from which the grating device is removed.
한편 광 디스크에서 반사된 광은 상기 DVD/CD 광학계에서 설명한 바와 같이 동일한 경로를 통해 광 검출기(130)로 입사된다. 이때에도 광 검출기(130)의 전단에 위치한 ASP(120)가 대략 40 ~ 50°로 경사져서 위치하고 있기 때문에, 광 검출기(130)는 45°기울인 비점수차를 생성하여 포커싱 서보를 수행하게 된다. On the other hand, the light reflected from the optical disk is incident to the photo detector 130 through the same path as described in the DVD / CD optical system. In this case, since the ASP 120 positioned at the front of the photodetector 130 is inclined at approximately 40 to 50 degrees, the photodetector 130 generates astigmatism of 45 degrees and performs focusing servo.
이와 같이 본 실시 예는 광-픽업 장치의 광학계에서 사용되었던 ASL 대신 상대적으로 가격이 저렴한 ASP를 사용하였고, 아울러 BD 광학계 구조에서 광원에서 조사된 광을 분할하는 그레이팅 소자를 제거하여 구조를 개선한 광-픽업 장치를 구성함을 확인할 수 있다. As described above, the present embodiment uses a relatively inexpensive ASP instead of ASL used in the optical system of the optical pickup device, and removes the grating element that splits the light emitted from the light source in the BD optical system to improve the structure. You can see that the pickup device is configured.
이상과 같이 본 발명의 도시된 실시 예를 참고하여 설명하고 있으나, 이는 예시적인 것들에 불과하며, 본 발명이 속하는 기술 분야의 통상의 지식을 가진자라면 본 발명의 요지 및 범위에 벗어나지 않으면서도 다양한 변형, 변경 및 균등한 타 실시 예들이 가능하다는 것을 명백하게 알 수 있을 것이다. 따라서 본 발명의 진정한 기술적 보호 범위는 첨부된 청구범위의 기술적인 사상에 의해 정해져야 할 것이다. Although described with reference to the illustrated embodiment of the present invention as described above, this is merely exemplary, those skilled in the art to which the present invention pertains without departing from the spirit and scope of the invention It will be apparent that other variations, modifications and equivalents are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (4)

  1. DVD 광 디스크 또는 CD 광디스크를 재생하도록 광을 조사하는 제1 광원;A first light source for irradiating light to reproduce a DVD optical disc or a CD optical disc;
    BD 광 디스크를 재생하도록 광을 조사하는 제2 광원;A second light source for irradiating light to reproduce the BD optical disc;
    상기 제1 광원에서 조사된 입사광과 상기 DVD 광 디스크 또는 CD 광 디스크에서 반사된 반사광을 분리하도록 소정 각도로 경사지면서 위치하는 플레이트 형상인 제1 빔 스플리터;A first beam splitter having a plate shape inclined at a predetermined angle to separate the incident light irradiated from the first light source and the reflected light reflected from the DVD optical disc or the CD optical disc;
    상기 제2 광원에서 조사된 입사광과 상기 BD 광 디스크에서 반사된 반사광을 분리하는 정육면체 형상인 제2 빔 스플리터;A second beam splitter having a cube shape separating the incident light irradiated from the second light source and the reflected light reflected from the BD optical disk;
    상기 제1 빔 스플리터와 상기 제2 빔 스플리터에서 조사된 광을 대물렌즈로 전달하는 미러; A mirror configured to transfer light emitted from the first beam splitter and the second beam splitter to an objective lens;
    상기 제2 빔 스플리터와 상기 미러 사이의 광 경로상에 위치하는 콜리메이트 렌즈 및 1/4 파장판; A collimating lens and a quarter wave plate positioned on an optical path between the second beam splitter and the mirror;
    상기 DVD 광 디스크, CD 광 디스크 또는 BD 광 디스크에서 반사된 광을 검출하여 광학적 신호를 전기적 신호로 변환하는 광 검출기; 및An optical detector for detecting light reflected from the DVD optical disc, CD optical disc or BD optical disc and converting an optical signal into an electrical signal; And
    상기 광 검출기와 상기 제1 빔 스플리터 사이에 위치하면서 상기 제1 빔 스플리터의 경사 각도와 동일한 각도로 기울어지며 상기 제1 빔 스플리터의 크기보다 작게 형성되는 ASP을 포함하는 광-픽업 장치. And an ASP positioned between the photo detector and the first beam splitter and inclined at an angle equal to the inclination angle of the first beam splitter and smaller than the size of the first beam splitter.
  2. 제 1 항에 있어서, The method of claim 1,
    상기 ASP는 상기 광 검출기와 45°방향으로 비점수차를 생성하여 포커싱 서보 제어를 수행하는 광-픽업 장치. And the ASP generates astigmatism in the 45 [deg.] Direction with the photodetector to perform focusing servo control.
  3. 제 1 항에 있어서, The method of claim 1,
    상기 제2 광원은, 1-빔 방식으로 트랙킹 서보 제어를 수행하는 광-픽업 장치. And the second light source performs tracking servo control in a one-beam manner.
  4. 제 1 항에 있어서, The method of claim 1,
    상기 제2 광원은 1-빔을 조사하여 상기 제2 빔 스플리터로 직접 전달하는 광-픽업 장치.And the second light source irradiates a 1-beam and delivers it directly to the second beam splitter.
PCT/KR2015/005852 2014-07-16 2015-06-10 Optical pickup device WO2016010264A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050105447A1 (en) * 2003-11-14 2005-05-19 Konica Minolta Opto, Inc. Optical pickup device and optical system used for the same
KR20060051541A (en) * 2004-09-22 2006-05-19 소니 가부시키가이샤 Optical pickup and optical disk apparatus
KR20090132978A (en) * 2008-06-23 2009-12-31 (주)아이엠 Optical pick up
US20130107693A1 (en) * 2011-10-27 2013-05-02 Sanyo Optec Design Co., Ltd. Optical pickup apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050105447A1 (en) * 2003-11-14 2005-05-19 Konica Minolta Opto, Inc. Optical pickup device and optical system used for the same
KR20060051541A (en) * 2004-09-22 2006-05-19 소니 가부시키가이샤 Optical pickup and optical disk apparatus
KR20090132978A (en) * 2008-06-23 2009-12-31 (주)아이엠 Optical pick up
US20130107693A1 (en) * 2011-10-27 2013-05-02 Sanyo Optec Design Co., Ltd. Optical pickup apparatus

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