KR930703669A - Fodder detection mechanism, optical head and optical memory using same - Google Patents

Fodder detection mechanism, optical head and optical memory using same

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Publication number
KR930703669A
KR930703669A KR1019930702028A KR930702028A KR930703669A KR 930703669 A KR930703669 A KR 930703669A KR 1019930702028 A KR1019930702028 A KR 1019930702028A KR 930702028 A KR930702028 A KR 930702028A KR 930703669 A KR930703669 A KR 930703669A
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South Korea
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light
detection
optical system
hologram element
optical
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KR1019930702028A
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Korean (ko)
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KR100191884B1 (en
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후미오 고야마
마사또시 요네꾸보
다까시 다께다
도시오 아리무라
히데후미 사까따
오사무 요꼬야마
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아이자와 스스무
세이꼬 엡슨 가부시끼가이샤
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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
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • 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
    • G11B7/13—Optical detectors therefor
    • G11B7/131—Arrangement of detectors in a multiple array
    • 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
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0908—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only
    • G11B7/0909—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only by astigmatic methods
    • 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
    • G11B7/123—Integrated head arrangements, e.g. with source and detectors mounted on the same substrate
    • 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
    • G11B7/1353—Diffractive elements, e.g. holograms or gratings
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/10532—Heads
    • G11B11/10541—Heads for reproducing
    • G11B11/10543—Heads for reproducing using optical beam of radiation
    • 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
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0908—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only
    • G11B7/0912—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only by push-pull method
    • 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
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0908—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only
    • G11B7/0916—Foucault or knife-edge methods

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Optical Head (AREA)
  • Diffracting Gratings Or Hologram Optical Elements (AREA)

Abstract

본 발명은 합초검출기구는 목표면(25)으로부터의 반사광을 홀로그램 소자(23)에서 회절시킨다. 회절광은 더불어 렌즈(22)의 촛점면(22f)에 가까운 동일 평면상에 최소 착란원을 만드는 2개의 비점수렴광속으로서 장척의 광검출수단(29), (30)에서 수광되고, 이들의 차동 출력에 의해서 합초검출 신호를 얻는다. 동일 평면상에 최소 착락원을 가지는 2개의 회절광을 형성할 수 있으므로 검출을 위한 광검출수단을 평치할 수 있고 치수 정밀도를 높힌 제조가 용이하다. 또, 홀로그램 소자를 사용하면서도 파장 변동을 흡수할 수 있어 매우 신뢰성이 높다.According to the present invention, the focus detecting mechanism diffracts the reflected light from the target surface 25 in the hologram element 23. The diffracted light is also received by the long photodetecting means 29, 30 as two astigmatic convergent beams which create a minimum confusion circle on the same plane close to the focal plane 22f of the lens 22, and their differential The output of the focus detection signal is obtained. Since two diffracted light beams having a minimum contact source can be formed on the same plane, the light detecting means for detection can be flattened and manufacturing with improved dimensional accuracy is easy. In addition, it is possible to absorb wavelength variations while using a hologram element, which is very reliable.

Description

합초검출기구 및 그것을 사용한 광헤드와 광기억장치Fodder detection mechanism, optical head and optical memory using same

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제1도는 본 발명에 사용하기 적합한 홀로그램의 패턴의 개략도이며, 제2도는 홀로그램에 의한 회절의 모양을 도시하는 설명도이며,제3도는 홀로그램에 의한 회절의 상세를 도시하는 다른 설명도이다.FIG. 1 is a schematic diagram of a holographic pattern suitable for use in the present invention, FIG. 2 is an explanatory diagram showing the shape of diffraction by hologram, and FIG. 3 is another explanatory diagram showing details of diffraction by hologram.

Claims (27)

합초 목표면으로부터의 반사광을 수렴시키는 검출 광학계와, 상기 검출 광학계중에 배치된 홀로그램 소자와, 상기 검출 광학계에 관해서 상기 목표면과 대략 공통 역할인 동일 평면상에 배치된 1쌍의 광검출수단을 포함하고, 상기 광검출수단의 긴길이 방향을 상기 홀로그램 소자에 의한 회절 방향에 대략 따라서 배치하고, 상기 홀로그램 소자는 쌍곡선군 또는 보정된 쌍곡선군을 대략 따라서 동상이자 주기적인 광변조율 패턴을 가지며, 상기 홀로그램 소자에 의해서 회절된 빔 단면 형상이 상보적으로 변화하는 1쌍의 비점회절광속을 1쌍의 상기 광검출 수단에 의해 검출하고, 1쌍의 상기 광검출수단의 출력의 차를 연산하므로서 상기 목표면으로의 합초를 검출하는 것을 특징으로 하는 합초검출기구.A detection optical system for converging the reflected light from the in-focus target surface, a hologram element disposed in the detection optical system, and a pair of light detection means arranged on the same plane with a role substantially in common with the target surface with respect to the detection optical system. And the long length direction of the light detecting means approximately in accordance with the diffraction direction by the hologram element, wherein the hologram element has an in-phase and periodic optical modulation pattern substantially along the hyperbolic group or the corrected hyperbolic group, and the hologram The pair of non-point diffraction light beams whose complementary beam cross-sectional shape diffracted by the element is detected by the pair of light detecting means, and the difference between the outputs of the pair of light detecting means is calculated. A fodder detection mechanism, characterized in that for detecting a foyer. 합초 목표면으로부터의 반사광을 수렴시키는 검출 광학계와, 상기 검출 광학계중에 배치된 홀로그램 소자와, 상기 검출 광학계에 관해서 상기 목표면과 대략 공통 역할인 동일 평면상에 배치된 1쌍의 광검출수단을 포함하고, 상기 광검출수단의 긴길이 방향을 상기 홀로그램 소자에 의한 회절 방향에 대략 따라서 배치하고, 상기 홀로그램 소자는 2개 이상의 영역으로 분할되고 분할된 각각의 영역에 쌍곡선군 또는 보정된 쌍곡선군을 대략 따라서 동상이자 주기적인 광변조율 패턴을 가지며, 상기 홀로그램 소자의 상이한 영역에 의해 회절된 비점회절광속을 서로 분리되고, 상기 홀로그램 소자의 상기한 영역에 의해 회절되고 빔단면 형상이 상보적으로 변화하는 1쌍의 비점회절광속을 1쌍의 상기 광검출수단으로 검출하고, 1쌍의 상기 광검출수단의 출력의 차를 연산하므로서 상기 목표면으로의 합초를 검출하는 것을 특징으로 하는 합초검출기구.A detection optical system for converging the reflected light from the in-focus target surface, a hologram element disposed in the detection optical system, and a pair of light detection means arranged on the same plane with a role substantially in common with the target surface with respect to the detection optical system. And the long length direction of the photodetecting means approximately in accordance with the diffraction direction by the hologram element, wherein the hologram element is divided into two or more regions and the hyperbolic group or the corrected hyperbolic group is roughly divided into each of the divided regions. Thus, 1 having an in-phase and periodic light modulation pattern, wherein the non-point diffraction light beams diffracted by different regions of the hologram element are separated from each other, diffracted by the region of the hologram element, and the beam cross-sectional shape complementarily changes. A pair of non-point diffraction light beams is detected by one pair of the light detecting means, and a pair of light detecting means exits. A focus detection mechanism for detecting the focusing on the target surface while calculating the difference in force. 제2항에 있어서, 상기 홀로그램 소자는 브레이즈화된 홀로그램 소자인 것을 특징으로 하는 합초검출기구.3. The focal detection device according to claim 2, wherein the hologram element is a brazed hologram element. 제1항 내지 제3항에 있어서, 상기 검출 광학계는 상기 목표면으로 광속을 입사시키는 투영 광학계와 공통인 것을 특징으로 하는 합초검출기구.The focus detection mechanism according to any one of claims 1 to 3, wherein the detection optical system is common to a projection optical system for injecting a light beam onto the target surface. 제1항 내지 제3항에 있어서, 상기 검출 광학계는 상기 투영 광학계와 적어도 일부를 독립으로 하고 상기 검출 광학계의 배율을 상기 투영 광하계의 배율과는 상이하게 하는 것을 특징으로 하는 합초검출기구.The focus detection mechanism according to any one of claims 1 to 3, wherein the detection optical system makes at least a part of the projection optical system independent and makes the magnification of the detection optical system different from the magnification of the projection light emission system. 제1항 내지 제3항에 있어서, 상기 검출 광학계는 상기 투영 광학계와 적어도 일부를 독립으로 하고 상기 홀로그램을 제외한 상기 검출 광학계에 상기 홀로그램 소자의 회절 방향에 관한 비점수차를 갖게 하는 것을 특징으로 하는 합초검출기구.4. The focusing method according to any one of claims 1 to 3, wherein the detection optical system makes at least a portion of the projection optical system independent and gives the astigmatism about the diffraction direction of the hologram element to the detection optical system except for the hologram. Detector. 제1항 내지 제6항에 있어서, 상기 광검출수단은 장척인 광검출소자와 상기 고아검출소자의 적어도 일부를 포위하는 다른 광검출소자로 이루어지며 양자의 차의 출력을 상기 광검출수단의 출력으로서 사용하는 것을 특징으로 하는 합초검출기구.7. The light detecting apparatus according to claim 1, wherein the light detecting means comprises a long light detecting element and another light detecting element surrounding at least a portion of the orphan detecting element and uses the output of the difference as the output of the light detecting means. A fodder detection mechanism, characterized in that 제1항 내지 제7항에 기재된 합초검출기구를 포함하여 재생 또는 기록 광빔의 광기록매체면으로의 합초 검출에 사용되는 것을 특징으로 하는 광헤드,An optical head comprising a focus detection mechanism according to any one of claims 1 to 7, which is used to detect focus of a reproduction or recording light beam onto an optical recording medium surface, 제8항에 있어서, 상기 광검출수단의 출력을 사용해서 상기 광기억매체의 기록 피트의 재생을 행하는 것을 특징으로 하는 광헤드.9. The optical head according to claim 8, wherein the output of said photodetecting means is used to reproduce the recording pits of said optical memory medium. 제8항에 있어서, 상기 광검출수단의 앞면에 검광자를 포함하고 상기 광기억매체의 광자기록에 의한 기록 피트의 재생을 행하는 것을 특징으로 하는 광헤드.10. The optical head according to claim 8, wherein an analyzer is provided on the front surface of the photodetecting means and reproduction of the recording pits by photon recording of the optical storage medium is performed. 제8항 내지 제10항에 있어서, 상기 광검출수단을 상기 광기억매체면의 트랙 접선 방향에 대응하는 분할선에 의해 둘로 분할하고 분할된 상기 광검출수단의 출력의 차에 의해서 상기 광빔의 트래킹 오차를 검출하는 것을 특징으로 하는 광헤드.11. The method of claim 8, wherein the light detecting means is divided into two by a dividing line corresponding to the track tangential direction of the surface of the optical storage medium, and the light beam is tracked by the difference in the output of the divided light detecting means. An optical head for detecting an error. 재생 또는 기록광빔의 광기억 매체면으로부터의 반사광을 수렴하는 검출 광학계와, 상기 검출 광학계중의 배치된 홀로그램 소자와, 상기 검출 광학계에 관해서 상기 목표면과 대략 공통역할인 동일 평면상에 배치된 1쌍의 광검출수단군을 포함하고, 1쌍의 상기 광검출수단군의 각각은 각각 2개의 광검출수단의 긴길이 방향을 상기 홀로그램 소자에 의한 회절 방향에 대략 따라서 배치하고, 상기 홀로그램 소자는 상기 광기억매체면의 트랙 접선 방향에 대응하는 분할선에 의해 둘로 분할되고 분할된 각각의 영역에 쌍곡선군 또는 보정된 쌍곡선군을 대략 따라서 동상이자 주기적인 광변조를 패턴을 가지며, 상기 홀로그램 소자가 상이한 영역으로 회절된 비점회절광속은 서로 분리되고, 빔단면형상이 동일 경사 방향으로 변화하고 상기 홀로그램 소자가 상이한 영역으로부터의 2개의 상기 비점회절광속으로 이루어지는 광속군을 비점회절광속군이라 정의했을 때, 빔단면 형상이 상보적으로 변화하는 1쌍의 비점회절광속군을 1쌍의 상기 광검출수단군에 의해 검출하고, 1쌍의 상기 광검출수단군의 각각의 상기 광검출수단의 출력합을 취하고 1쌍의 상기 출력합의 차를 연산하여 상기 목표면으로의 합초를 검출하고, 상기 홀로그램 소자의 동일 영역으로부터 회절된 2개의 상기 비점회절광속을 상기 광검출수단으로 검출해서 합계 출력을 취하여 2개의 상기 합계 출력의 차를 연산하고 상기 광빔의 트래킹 오차를 검출하는 것을 특징으로 하는 광헤드.A detection optical system for converging the reflected light from the optical storage medium surface of the reproduction or recording light beam, a hologram element disposed in the detection optical system, and one disposed on the same plane having a substantially common role with respect to the target surface with respect to the detection optical system; A pair of photodetecting means groups, wherein each of the pair of photodetecting means groups respectively arranges the long length directions of the two photodetecting means substantially along the diffraction direction by the hologram element, and the hologram element comprises the optical memory Each region divided and divided into two by a dividing line corresponding to the track tangential direction of the medium plane has a pattern of in-phase and periodic optical modulation substantially along the hyperbolic group or corrected hyperbolic group, and the hologram element is moved to a different region. The diffracted beam diffraction beams are separated from each other, the beam cross-sectional shape changes in the same oblique direction, and the hologram element When the light beam group consisting of the two non-point diffraction light beams from different areas is defined as the non-point diffraction light beam group, a pair of non-point diffraction light beam groups whose beam cross-sectional shape is complementarily changed by the pair of light detection means groups. Detects, takes the output sum of each of the photodetecting means of the pair of photodetection means, calculates the difference of the pair of the output sums, detects the in-focus to the target surface, and diffracts from the same region of the hologram element And detecting the two non-point diffraction light beams by the light detecting means, taking a total output, calculating a difference between the two total outputs, and detecting a tracking error of the light beam. 제12항에 있어서, 상기 광검출수단의 검출 출력을 사용해서 상기 광기억 매체의 광자기록에 의한 기록피트의 재생을 행하는 광헤드.13. The optical head according to claim 12, wherein reproduction of recording pits by photon recording of said optical storage medium is performed by using the detection output of said photodetecting means. 제12항에 있어서, 상기 광검출수단의 앞면에 검광자를 포함하고 상기 광기억매체의 광자기기록에 의한 기록 피트의 재생을 행하는 광헤드.13. The optical head according to claim 12, further comprising an analyzer on the front surface of the light detecting means and reproducing the recording pits by magneto-optical recording of the optical storage medium. 제14항에 있어서, 상기 홀로그램 소자의 상이한 영역으로부터의 상보적인 비점회절광속 끼리 회절광속을 수광하는 2조의 상기 광검출수단의 앞면에 서로의 조에 대해서 투과축의 방위각이 상이한 검광자를 포함하는 것을 특징으로 하는 광헤드.15. The apparatus according to claim 14, characterized in that the front face of the two sets of light detecting means for receiving the diffracted light beams between complementary non-diffraction light beams from different regions of the hologram element includes an analyzer having different azimuth angles of the transmission axis relative to each other. Optical head. 제12항 내지 제15항에 있어서, 상기 광검출수단은 장척인 광검출소자와 상기 광검출소자의 적어도 일부를 포위하는 다른 광검출소자로 이루어지며 양자의 차의 출력을 상기 광검출수단의 출력으로 사용하는 것을 특징으로 하는 광헤드.16. The light detecting apparatus according to claim 12, wherein the light detecting means comprises a long light detecting element and another light detecting element surrounding at least a part of the light detecting element, and uses the output of the difference as the output of the light detecting means. An optical head, characterized in that. 재생 또는 기록광빔의 광기억매체면으로부터의 반사광을 수렴시키는 검출 광학계와, 상기 검출 광학계중에 배치된 홀로그램 소자와, 상기 검출 광학계에 관해서 상기 목표면과 대략 공통 역할인 동일평면상에 배치된 1쌍의 광검출수단을 포함하고, 상기 광검출수단의 긴길이 방향을 상기 홀로그램 소자에 의한 회절방향에 대략 따라서 배치하고, 상기 홀로그램 소자는 상기 광기억매체면의 트랙 접선 방향에 대응하는 분할선으로 둘로 분할되고 분할된 각각의 영역에 쌍곡선군 또는 보정된 쌍곡선군을 대략 따라서 동상이자 주기적인 광변조를 패턴을 가지며 브레이즈화되고, 상기 홀로그램 소자가 상이한 영역으로 회절된 비점회절 광속은 서로 분리되고, 상기 홀로그램 소자의 상이한 영역으로 회절되고, 빔단면 형상이 상보적으로 변화하는 1쌍의 상기 비점회절광속을 1쌍의 상기 광검출수단으로 검출하고, 상기 광검출수단은 장척인 광검출소자와 상기 광검출소자의 적어도 일부를 포위하는 다른 광검출소자로 이루어지며, 상기 장척인 광검출수단의 출력의 차를 연산하므로서 트래킹 오차를 검출하는 것을 특징으로 하는 광헤드.A detection optical system for converging the reflected light from the optical storage medium surface of the reproduction or recording light beam, a hologram element disposed in the detection optical system, and a pair arranged on the same plane having a substantially common role with the target surface with respect to the detection optical system And a photodetecting means, wherein the long length direction of the photodetecting means is disposed substantially along the diffraction direction by the hologram element, and the hologram element is divided into two by a dividing line corresponding to the track tangential direction of the optical memory medium surface. In each segmented and divided region, the non-point diffraction light beams having a pattern of in-phase and periodic light modulation are brazed with the hyperbolic group or the corrected hyperbolic group roughly along the pattern, and the hologram element diffracted into different regions are separated from each other, and A pair of images diffracted into different regions of the hologram element, the beam cross-sectional shape complementarily changing The non-point diffraction light beam is detected by a pair of the light detecting means, and the light detecting means comprises a long light detecting element and another light detecting element surrounding at least a portion of the light detecting element, and the output of the long light detecting means. An optical head characterized by detecting a tracking error by calculating a difference of. 제17항에 있어서, 상기 장척인 광검출소자와 상기 광검출소자의 적어도 일부를 포위하는 상기의 다른 광검출소자의 출력합을 취하고 1쌍의 상기 출력합의 차를 연산하므로서 트래킹 오차를 검출하는 것을 특징으로 하는 광헤드.18. The tracking error is detected by taking the output sum of the long photodetector and the other photodetector surrounding at least a portion of the photodetector and calculating the difference between the pair of output sums. Optical head. 제17항 내지 제18항에 있어서, 상기 광검출수단의 검출 출력을 사용해서 상기 광기억 매체의 기록 피트의 재생을 행하는 것을 특징으로 하는 광헤드.19. The optical head according to any one of claims 17 to 18, wherein the recording pit of the optical storage medium is reproduced using the detection output of the light detecting means. 제17항 내지 제18항에 있어서, 상기 광검출수단의 앞면에 검광자를 포함하고 상기 광기억매체의 광자기 기록에 의한 기록 피트의 재생을 행하는 것을 특징으로 하는 광헤드.19. The optical head according to any one of claims 17 to 18, comprising an analyzer on the front surface of the light detecting means and reproducing the recording pits by magneto-optical recording of the optical storage medium. 제12항 내지 제20항에 있어서, 상기 광변조를 패턴을 각각 다른 각도만큼 회전시키므로서 상기 비점회절광속을 분리하는 것을 특징으로 하는 광헤드.21. The optical head according to any one of claims 12 to 20, wherein the light diffraction beam is separated by rotating the light modulation by different angles. 제12항 내지 제20항에 있어서, 상기 광변조를 패턴을 각각 다른 주기로 하므로서 상기 비점회절광속을 분리하는 것을 특징으로 하는 광헤드.21. The optical head according to any one of claims 12 to 20, wherein the non-point diffraction beams are separated while the light modulation is performed at different periods. 제12항 내지 제22항에 있어서, 상기 검출 광학계는 상기 광빔의 투영 광학계와 공통된 것을 특징으로 하는 광헤드.23. The optical head according to claim 12, wherein the detection optical system is common to the projection optical system of the light beam. 제12항 내지 제22항에 있어서, 상기 검출 광학계는 상기 광빔의 투영 광학계와 적어도 일부를 독립으로 하고 상기 검출 광학계의 배율을 상기 투영 광학계의 배율과는 상이하게 하는 것을 특징으로 하는 광헤드.23. The optical head according to claim 12, wherein the detection optical system makes at least a part of the projection optical system of the light beam independent and makes the magnification of the detection optical system different from the magnification of the projection optical system. 제12항 내지 제22항에 있어서, 상기 검출 광학계는 상기 광속의 투영 광학계와 적어도 일부를 독립으로 하고 상기 홀로그램을 제외한 상기 검출 광학계에 상기 홀로그램 소자의 회절 방향에 관한 비점수차를 갖게 하는 것을 특징으로 하는 광헤드.23. The method according to claims 12 to 22, wherein the detection optical system makes at least a portion of the projection optical system of the luminous flux independent, and gives the astigmatism about the diffraction direction of the hologram element to the detection optical system except the hologram. Optical head. 광기억매체상에 재생 또는 기록광빔을 조사하는 제8항 내지 제10항에 기재된 광헤드와 상기 광헤드의 합초검출결과에 따라서 촛점 맞춤을 행하는 포커싱 수단을 포함하는 것을 특징으로 하는 광기억장치.And a focusing means for focusing the optical head according to claims 8 to 10 for irradiating a reproducing or recording light beam onto the optical storage medium and the result of the focus detection of the optical head. 광기억매체상에 재생 또는 기록 광빔을 조사하는 제11항 내지 제25항에 기재된 광헤드와 상기 광헤드의 합초검출결과에 따라서 촛점 맞춤을 행하는 포커싱 수단과 상기 광헤드의 트래킹 오차의 검출 결과에 따라서 트랙 맞춤을 행하는 트래킹 수단을 포함하는 것을 특징으로 하는 광기억장치.Focusing means for focusing according to the result of focusing detection of the optical head according to claims 11 to 25 for irradiating a reproducing or recording light beam onto the optical storage medium and the detection result of the tracking error of the optical head. And a tracking means for performing track alignment. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019930702028A 1991-11-08 1992-11-06 Focus detecting mechanism and optical head and optical storage using the same KR100191884B1 (en)

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JP91-293329 1991-11-08
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JP8554192 1992-04-07
JP92-85541 1992-04-07
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