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    • 3. 发明授权
    • Optical device having a light emitter and a photosensor on the same
optical axis
    • 在同一光轴上具有光发射器和光传感器的光学装置
    • US5679947A
    • 1997-10-21
    • US613858
    • 1996-03-11
    • Masato DoiHironobu NaruiOsamu MatsudaKenji Sahara
    • Masato DoiHironobu NaruiOsamu MatsudaKenji Sahara
    • G11B11/10G11B7/12G11B7/125G11B7/13G11B11/105H01S5/026H01S5/18H01J3/14
    • G11B7/127G11B11/10545G11B7/123G11B7/133H01S5/0262H01S5/18
    • An optical device structure can be simplified and miniaturized on the whole. A fabrication of optical device can be simplified and the optical device can be improved in reliability. The optical device can increase its output, operate a light emitting light source with a reduced power and reduce a power consumption by increasing a quantity of reflected-back light to a photosensor device, i.e., a quantity of photosensed light. An optical device includes a light emitting section (1), a radiated section (2), a converging means (3) and a photosensor section (4). Light emitted from the light emitting section (1) is converged and radiated on the radiated section (2) by the converging means (3). Reflected-back light (L.sub.R) reflected from the radiated section (2) is converged and the photosensor section (4) is disposed near a confocal of the converging means (3) concerning reflected-back light from the radiated section (2). Light emitted from the light emitting section (1) is passed through a path of the same axis and photosensed by the photosensor section (4) as shown by a one-dot chain line (a) representing the optical axis before and after the emitted light is reflected by the radiated section (2).
    • 光学装置结构整体上可以简化和小型化。 可以简化光学器件的制造,并且可以提高光学器件的可靠性。 光学装置可以增加其输出,通过增加向光电传感器装置的反射光量(即一定数量的光照射)来降低功率来操作发光光源并降低功率消耗。 光学装置包括发光部分(1),辐射部分(2),会聚装置(3)和光电传感器部分(4)。 从发光部(1)发射的光通过会聚装置(3)会聚并辐射在辐射部(2)上。 从辐射部分(2)反射的反射光(LR)会聚,并且光电传感器部分(4)设置在会聚装置(3)的共焦点附近,涉及来自辐射部分(2)的反射光。 从光发射部分(1)发射的光通过相同轴线的路径并由光电传感器部分(4)照射,如在发射光之前和之后的表示光轴的单点划线(a)所示 被辐射部分(2)反射。
    • 9. 发明授权
    • Optical device which detects reflected light with a push-pull method
without dividing the reflected light
    • 利用推挽方式检测反射光而不分光反射光的光学装置
    • US5703863A
    • 1997-12-30
    • US603872
    • 1996-02-22
    • Masato DoiHironobu NaruiTakashi Nakao
    • Masato DoiHironobu NaruiTakashi Nakao
    • G11B11/10G11B7/00G11B7/004G11B7/09G11B7/12G11B11/105
    • G11B7/0901G11B7/123
    • An optical device comprises a light-emitting portion (4), a converging means (3), and a light-receiving portion (5), wherein light (L.sub.F) emitted from the light-emitting portion (4) is converged and irradiated by the converging means (3) on an irradiated portion (2) and returned light (L.sub.R) reflected from the irradiated portion (2) also is converged by the converging means (3), the light-receiving portion (5) is disposed near a confocal position of returned light (L.sub.R) from the irradiated portion (2) of the converging means (2), light (L.sub.F) emitted from the light-emitting portion (4) is passed through a light path of the same axis and received by the light-receiving portion (5) before and after it is reflected on the irradiated portion (2), and the light-receiving portion (5) detects a signal based on a push-pull method. In the optical device such as an optical pickup, the number of optical components can be reduced, and alignment required to adjust optical components of the optical device for proper interrelationship can be simplified. Thus, the optical device can be simplified and miniaturized. Also, a tracking servo signal can be stably detected by utilizing push-pull method.
    • 光学装置包括发光部分(4),会聚装置(3)和光接收部分(5),其中从发光部分(4)发射的光(LF)被会聚和照射 照射部分(2)上的会聚装置(3)和从照射部分(2)反射的返回光(LR)也被会聚装置(3)会聚,光接收部分(5)靠近一个 从会聚装置(2)的照射部分(2)返回的光(LR)的共焦点位置,从发光部分(4)发射的光(LF)通过相同轴线的光路并被 光接收部分(5)在其照射部分(2)之前和之后被反射,并且光接收部分(5)基于推挽方法检测信号。 在诸如光学拾取器的光学装置中,可以减少光学部件的数量,并且可以简化为了适当的相互关系而调整光学装置的光学部件所需的对准。 因此,光学装置可以被简化和小型化。 此外,通过利用推挽方法可以稳定地检测跟踪伺服信号。