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公开(公告)号：EP0390610B1
公开(公告)日：1998-05-13
申请号：EP90303482.5
申请日：1990-03-30
发明人： Yoshida, Yoshio , Miyake, Takahiro , Nakata, Yasuo , Kurata, Yukio , Ogata, Nobuo , Ueyama, Tetsuo , Sato, Hideaki
CPC分类号： G11B7/1365 , G02B1/118 , G02B5/1809 , G02B5/1814 , G02B5/1866 , G02B27/4261 , G02B27/4272 , G11B7/1353 , G11B11/10543
摘要： An optical element comprises a polarization diffraction element (1) that is provided with diffraction gratings (3,4) that are respectively mounted on different faces of a transparent substrate (2) of a flat plate shape, which grating pitches are equal to each other and approximately equal to the wavelength of an incident light, and which grating lines are parallel; or comprises a phase shifting element or an antireflection element composed by a grating which grating pitch is approximately equal to the wavelength of an incident light (5), formed on a transparent base; or comprises a polarization diffraction element (1) that is provided with a substrate (2) made of a material having an optical anisotropy property, and a grating (3,4), and wherein the thickness of the substrate is set such that the difference that occurs between the phases of the P and S polarizations of a light due to the grating, and the difference that occurs between the phases of the two polarizations when the light propagates through the substrate, and cancel out; or comprises a polarization diffraction unit wherein a diffraction grating which grating pitch is approximately equal to the wavelength of an incident light, is formed on a face of a transparent substrate, and a phase compensating grating which grating lines are substantially orthogonal to the grating lines of the diffraction grating, is formed on the other face of the substrate. An optical pickup device comprises an optical element wherein a grating which grating pitch is approximately equal to the wavelength of an incident light, is formed on a transparent base. An optical pickup device comprises a polarized light detecting unit provided with a diffraction grating which grating pitch is approximately equal to the wavelength of an incident light, that is formed on a transparent substrate, and that splits the incident light into two polarized lights having mutually orthogonal polarizations; a first photodetector that is mounted integrally and virtually in parallel with the substrate, and that receives a zeroth-order diffracted light produced by the diffraction grating; and a second photodetector that is located in the same plane as the first photodetector and mounted integrally with the first photodetector and the substrate, and that receives a first-order diffracted light produced by the diffraction grating. As a result, a simple and inexpensive optical element may be fabricated, and a compact and light optical pickup device may be designed. Furthermore, the access to a magneto-optical recording medium may be performed accurately, and recording signals of high quality may be obtained.
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公开(公告)号：EP0378438B1
公开(公告)日：1995-03-29
申请号：EP90300380.4
申请日：1990-01-12
CPC分类号： G11B7/1381 , G11B7/0903 , G11B7/0916 , G11B7/094 , G11B7/1353
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公开(公告)号：EP0592075A1
公开(公告)日：1994-04-13
申请号：EP93305687.1
申请日：1993-07-20
CPC分类号： G01J4/04 , G02B5/1809 , G02B5/1814 , G02B27/283
摘要： A polarization detector of the present invention includes: a polarization diffraction element (111) having a substrate with two facing surfaces which are placed in parallel with each other, a first diffraction (112) grating formed on one surface of the substrate, and a second diffraction (113) grating formed on the other surface of the substrate, light being incident upon the first diffraction grating, each grating pitch of the first diffraction grating and the second diffraction grating being nearly equal to a wavelength of the incident light; a limiting member for limiting an incident region of the incident light with respect to the polarization diffraction element, formed on a light incident side of the first diffraction grating; a converging lens (120) for respectively converging light transmitted through the first diffraction grating and the second diffraction grating and light diffracted by the first diffraction grating and the second diffraction grating into different beam spots; and a pair of photodetectors (130a,130b) for detecting each optical intensity of the two beam spots converged by the converging lens.
摘要翻译： 本发明的偏振检测器包括：具有彼此平行放置的具有两个相对表面的基板的偏振衍射元件（111），形成在基板的一个表面上的第一衍射（112）光栅，以及第二衍射元件 形成在基板的另一个表面上的衍射（113）光栅，入射到第一衍射光栅上的光，第一衍射光栅和第二衍射光栅的每个光栅间距几乎等于入射光的波长; 用于限制入射光相对于所述偏振衍射元件的入射区域的限制构件，所述入射区域形成在所述第一衍射光栅的光入射侧; 聚光透镜（120），用于分别将透射通过第一衍射光栅和第二衍射光栅的光会聚，并将由第一衍射光栅和第二衍射光栅衍射的光分别会聚到不同的光束点中; 以及一对光检测器（130a，130b），用于检测会聚透镜会聚的两束光束的每个光强度。
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14.发明授权
公开(公告)号：EP0352099B1
公开(公告)日：1993-09-15
申请号：EP89307336.1
申请日：1989-07-19
发明人： Miyake, Tomoyuki , Katayama, Hiroyuki , Nakayama, Junichiro , Miyake, Takahiro , Ohta, Kenji , Kobayashi, Shozo
IPC分类号： G11B11/10
CPC分类号： G11B11/10508
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15.发明公开An optical pickup apparatus and a hologram element used for same 失效Optische Abtastvorrichtung und holographisches Elementdafür。
公开(公告)号：EP0545735A1
公开(公告)日：1993-06-09
申请号：EP92311108.2
申请日：1992-12-04
CPC分类号： G11B7/1353 , G02B5/32 , G11B7/08564 , G11B11/10532 , G11B11/10556
摘要： An optical pickup apparatus including a light emitting source (10), a hologram element (7) for scanning a recording medium (22) with light beams emitted from the light emitting source (10), a hologram lens (8) for focusing the light beams introduced from the hologram element (7) on the recording medium (22), an optical detector (9) for detecting the light beams reflected from the recording medium (22), and a first optical system for directing the light beams reflected from the recording medium (22) to the optical detector (9). The hologram element (7) includes an optical diffraction grating for diffracting the light beams emitted from the light emitting source (10) and a control means for controlling the rotation of the hologram element (7) in a swinging manner. The hologram element (7) can have hologram gratings on both surfaces thereof; one of them has a pattern of straight lines and the other has a pattern of concentric circles to obtain a widened deflection angle.
摘要翻译： 一种光拾取装置，包括发光源（10），用于利用从发光源（10）发射的光束扫描记录介质的全息元件（7），用于聚焦光的全息透镜（8） 从记录介质（22）上的全息元件（7）引入的光束，用于检测从记录介质（22）反射的光束的光学检测器（9），以及用于引导从记录介质 记录介质（22）到光学检测器（9）。 全息元件（7）包括用于衍射从发光源（10）发射的光束的光学衍射光栅和用于以摆动方式控制全息元件（7）的旋转的控制装置。 全息元件（7）可以在其两个表面上具有全息光栅; 其中一个具有直线的图案，另一个具有同心圆的图案以获得加宽的偏转角。
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公开(公告)号：EP0380320A3
公开(公告)日：1991-06-26
申请号：EP90300741.7
申请日：1990-01-24
CPC分类号： G11B7/1353 , G11B7/123
摘要： An optical pickup apparatus for reading out information from an optical disk. The optical pickup apparatus comprises a light source (1) and an optical device (2) having a grating pattern for splitting a light beam from said source into a zero-order diffracted beam and plus and minus first-order diffracted beams. The grating pattern has a centre portion (a) and one or more side portions (b). The efficiency of the centre portion (a) for the zero-order diffracted beam is greater than the efficiency of the side portions (b) for the zero-order diffracted beam.
摘要翻译： 一种用于从光盘读出信息的光学拾取装置。 该光学拾取装置包括光源（1）和具有光栅图案的光学装置（2），光栅图案用于将来自所述光源的光束分成零级衍射光束和正负一级衍射光束。 光栅图案具有中心部分（a）和一个或多个侧部分（b）。 零级衍射光束的中心部分（a）的效率大于零级衍射光束的边缘部分（b）的效率。
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公开(公告)号：EP0340988A3
公开(公告)日：1991-06-26
申请号：EP89304302.6
申请日：1989-04-28
IPC分类号： G06K19/08
CPC分类号： G06K19/10
摘要： A memory card comprising a memory medium on which at least one of the record, reproduction and erasure of information can be conducted. The memory card further comprises an indicating means the state of which can be altered in accordance with the condition whether the memory medium is permitted or not to be subjected to at least one of the record, reproduce and erase of information. An apparatus for processing the memory card comprises a detection means for detecting the state of the indicating means.
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18.发明公开Optical element and optical pickup device comprising it 失效Optisches Element und dieses enthaltende optische Abtasteinrichtung。
公开(公告)号：EP0390610A2
公开(公告)日：1990-10-03
申请号：EP90303482.5
申请日：1990-03-30
发明人： Yoshida, Yoshio , Miyake, Takahiro , Nakata, Yasuo , Kurata, Yukio , Ogata, Nobuo , Ueyama, Tetsuo , Sato, Hideaki
IPC分类号： G02B5/18
CPC分类号： G11B7/1365 , G02B1/118 , G02B5/1809 , G02B5/1814 , G02B5/1866 , G02B27/4261 , G02B27/4272 , G11B7/1353 , G11B11/10543
摘要： An optical element comprises a polarization diffraction element (1) that is provided with diffraction gratings (3,4) that are respectively mounted on different faces of a transparent substrate (2) of a flat plate shape, which grating pitches are equal to each other and approximately equal to the wavelength of an incident light, and which grating lines are parallel; or comprises a phase shifting element or an antireflection element composed by a grating which grating pitch is approximately equal to the wavelength of an incident light (5), formed on a transparent base; or comprises a polarization diffraction element (1) that is provided with a substrate (2) made of a material having an optical anisotropy property, and a grating (3,4), and wherein the thickness of the substrate is set such that the difference that occurs between the phases of the P and S polarizations of a light due to the grating, and the difference that occurs between the phases of the two polarizations when the light propagates through the substrate, and cancel out; or comprises a polarization diffraction unit wherein a diffraction grating which grating pitch is approximately equal to the wavelength of an incident light, is formed on a face of a transparent substrate, and a phase compensating grating which grating lines are substantially orthogonal to the grating lines of the diffraction grating, is formed on the other face of the substrate.
An optical pickup device comprises an optical element wherein a grating which grating pitch is approximately equal to the wavelength of an incident light, is formed on a transparent base. An optical pickup device comprises a polarized light detecting unit provided with a diffraction grating which grating pitch is approximately equal to the wavelength of an incident light, that is formed on a transparent substrate, and that splits the incident light into two polarized lights having mutually orthogonal polarizations; a first photodetector that is mounted integrally and virtually in parallel with the substrate, and that receives a zeroth-order diffracted light produced by the diffraction grating; and a second photodetector that is located in the same plane as the first photodetector and mounted integrally with the first photodetector and the substrate, and that receives a first-order diffracted light produced by the diffraction grating.
As a result, a simple and inexpensive optical element may be fabricated, and a compact and light optical pickup device may be designed. Furthermore, the access to a magneto-optical recording medium may be performed accurately, and recording signals of high quality may be obtained.摘要翻译： 光学元件包括偏振衍射元件（1），该偏振衍射元件（1）设置有分别安装在平板形状的透明基板（2）的不同表面上的衍射光栅（3,4），该光栅间距彼此相等 并且大致等于入射光的波长，哪些光栅线平行; 或包括形成在透明基底上的光栅间距近似等于入射光（5）的波长的由光栅构成的相移元件或抗反射元件; 或包括设置有由具有光学各向异性特性的材料制成的基板（2）的偏振衍射元件（1）和光栅（3,4），并且其中基板的厚度被设定为使得差异 发生在由于光栅引起的光的P和S偏振的相位之间，以及当光传播通过衬底时在两个偏振的相位之间发生的差异，并抵消; 或者包括偏振衍射单元，其中在透明基板的表面上形成光栅间距近似等于入射光的波长的衍射光栅，并且相位补偿光栅的光栅线基本上与 衍射光栅形成在基板的另一面上。 光学拾取装置包括光学元件，其中光栅间距近似等于入射光的波长的光栅形成在透明基底上。 一种光拾取装置，包括：具有衍射光栅的偏振光检测单元，栅格间距近似等于入射光的波长，形成在透明基板上，并将入射光分为两个相互正交的偏振光 极化; 第一光电检测器，其一体地安装并且基本上与基板平行，并且接收由衍射光栅产生的零级衍射光; 以及第二光电检测器，其位于与第一光电检测器相同的平面中并与第一光电检测器和基板一体地安装，并且接收由衍射光栅产生的一级衍射光。 结果，可以制造简单且廉价的光学元件，并且可以设计紧凑且轻便的光学拾取装置。 此外，可以精确地执行对磁光记录介质的访问，并且可以获得高质量的记录信号。
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公开(公告)号：EP0554092B1
公开(公告)日：1998-09-09
申请号：EP93300638.9
申请日：1993-01-28
发明人： Nakata, Yasuo , Yoshida, Yoshio , Miyake, Takahiro , Sato, Hideaki , Kurata, Yukio , Yamamoto, Hiroyuki , Ogata, Nobuo , Kubo, Katsuhiro
IPC分类号： G11B7/135
CPC分类号： G11B7/1353
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20.发明公开Optical element and optical pickup device comprising the same 失效Optischer Bauteil und optischesWiedergabegerätmit dergleichem
公开(公告)号：EP0803868A2
公开(公告)日：1997-10-29
申请号：EP97111248.7
申请日：1990-03-30
发明人： Yoshida, Yoshio , Miyake, Takahiro , Nakata, Yasuo , Kurata, Yukio , Ogata, Nobuo , Ueyama, Tetsuo , Sato, Hideaki
CPC分类号： G11B7/1365 , G02B1/118 , G02B5/1809 , G02B5/1814 , G02B5/1866 , G02B27/4261 , G02B27/4272 , G11B7/1353 , G11B11/10543
摘要： An optical element comprises a polarization diffraction element that is provided with diffraction gratings that are respectively mounted on different faces of a transparent substrate of a flat plate shape, which grating pitches are equal to each other and approximately equal to the wavelength of an incident light, and which grating lines are parallel; or comprises a phase shifting element or an antireflection element composed by a grating which grating pitch is approximately equal to the wavelength of an incident light, formed on a transparent base; or comprises a polarization diffraction element that is provided with a substrate made of a material having an optical anisotropy property, and a grating, and wherein the thickness of the substrate is set such that the difference that occurs between the phases of the P and S polarizations of a light due to the grating, and the difference that occurs between the phases of the two polarizations when the light propagates through the substrate, and cancel out; or comprises a polarization diffraction unit wherein a diffraction grating which grating pitch is approximately equal to the wavelength of an incident light, is formed on a face of a transparent substrate, and a phase compensating grating which grating lines are substantially orthogonal to the grating lines of the diffraction grating, is formed on the other face of the substrate.
An optical pickup device comprises an optical element wherein a grating which grating pitch is approximately equal to the wavelength of an incident light, is formed on a transparent base. An optical pickup device comprises a polarized light detecting unit provided with a diffraction grating which grating pitch is approximately equal to the wavelength of an incident light, that is formed on a transparent substrate, and that splits the incident light into two polarized lights having mutually orthogonal polarizations; a first photodetector that is mounted integrally and virtually in parallel with the substrate, and that receives a zeroth-order diffracted light produced by the diffraction grating; and a second photodetector that is located in the same plane as the first photodetector and mounted integrally with the first photodetector and the substrate, and that receives a first-order diffracted light produced by the diffraction grating.
As a result, a simple and inexpensive optical element may be fabricated, and a compact and light optical pickup device may be designed. Furthermore, the access to a magneto-optical recording medium may be performed accurately, and recording signals of high quality may be obtained.摘要翻译： 光学元件包括具有衍射光栅的偏振衍射元件，衍射光栅分别安装在平板形状的透明基板的不同的表面上，该光栅间距彼此相等并且近似等于入射光的波长， 哪些光栅线是平行的？ 或者包括形成在透明基底上的由光栅构成的相移元件或抗反射元件，光栅间距近似等于入射光的波长; 或包括设置有由具有光学各向异性特性的材料制成的基板的偏振衍射元件和光栅，并且其中基板的厚度设定为使得在P和S偏振的相位之间发生的差异 由于光栅引起的光，以及当光传播通过衬底时在两个偏振的相位之间发生的差异，并且抵消; 或者包括偏振衍射单元，其中在透明基板的表面上形成光栅间距近似等于入射光的波长的衍射光栅，并且相位补偿光栅的光栅线基本上与 衍射光栅形成在基板的另一面上。 光学拾取装置包括光学元件，其中光栅间距近似等于入射光的波长的光栅形成在透明基底上。 一种光拾取装置，包括：具有衍射光栅的偏振光检测单元，栅格间距近似等于入射光的波长，形成在透明基板上，并将入射光分为两个相互正交的偏振光 极化; 第一光电检测器，其一体地安装并且基本上与基板平行，并且接收由衍射光栅产生的零级衍射光; 以及第二光电检测器，其位于与第一光电检测器相同的平面中并与第一光电检测器和基板一体地安装，并且接收由衍射光栅产生的一级衍射光。 结果，可以制造简单且廉价的光学元件，并且可以设计紧凑且轻便的光学拾取装置。 此外，可以精确地执行对磁光记录介质的访问，并且可以获得高质量的记录信号。
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