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    • 6. 发明授权
    • Displacement detecting device for optical head
    • 光头位移检测装置
    • US5715219A
    • 1998-02-03
    • US651508
    • 1996-05-22
    • Tadashi TakedaKenji FukuiRicardo Musashi OkamotoHiroyuki Wada
    • Tadashi TakedaKenji FukuiRicardo Musashi OkamotoHiroyuki Wada
    • G11B7/09G11B7/13G11B7/135
    • G11B7/094G11B7/131G11B7/1353G11B7/0943
    • A displacement detecting device for optical head is disclosed which is capable of stably generating displacement detecting signals without being affected by fluctuation of wavelength of light emitted from a light source. The displacement detecting device is provided for use in an optical head which comprises a optical sensor for reading information recorded on an optical information recording medium by irradiating the optical information recording medium with light from a light source and detecting reflected light from the irradiated surface of the recording medium as well as detecting focus displacement and track displacement by utilizing diffracted light of the reflected light. The optical sensor is provided with wavelength fluctuation component detector for detecting wavelength fluctuation components in the reflected light. At least one of a focus displacement detecting signal and a track displacement detecting signal is compensated for based on a wavelength fluctuation detecting signal generated by the wavelength fluctuation component detector, thereby enabling the displacement detection to be stably performed without being affected by fluctuation of the wavelength of light emitted from a light source.
    • 公开了一种用于光头的位移检测装置,其能够稳定地产生位移检测信号,而不受来自光源的光的波长的波动的影响。 该位移检测装置用于光学头,该光学头包括光学传感器,该光学传感器用于通过用来自光源的光照射光学信息记录介质并检测来自光源的照射表面的反射光来读取记录在光学信息记录介质上的信息 记录介质以及通过利用反射光的衍射光来检测聚焦位移和轨迹位移。 光学传感器设置有用于检测反射光中的波长波动成分的波长波动成分检测器。 基于由波长波动成分检测器生成的波长波动检测信号,补偿焦点位移检测信号和轨道位移检测信号中的至少一个,从而能够稳定地进行位移检测而不受波长波动的影响 从光源发出的光。
    • 7. 发明授权
    • Photo-detection device used in an optical pickup head for detecting
focusing error signal
    • 用于检测聚焦误差信号的光学拾取头中的光检测装置
    • US5909423A
    • 1999-06-01
    • US441837
    • 1995-05-16
    • Kenji FukuiRicardo Musashi Okamoto
    • Kenji FukuiRicardo Musashi Okamoto
    • G11B7/09G11B7/135G11B7/00
    • G11B7/1353G11B7/0908G11B7/0916
    • There is provided an optical pickup head which can accurately detect a focusing error even when the wavelength of light emitted from a light source varies. A holographic element diffracts a light beam reflected by an optical disk to obtain .+-.1st-order diffracted light beams, and has a diffracting area formed using a Fresnel zone plate, and a light-shading area for shading the reflected light beam. A photo-detector has four-elements light-receiving areas. The photo-detector detects the .+-.1st-order diffracted light beams diffracted by the diffracting area and focused by a convex lens, and converts these light beams into electrical signals. The photo-detector is disposed at substantially the middle point between the focal points of the -1st-order diffracted light beams formed by the convex lens. Since the middle point does not move even when the lasing wavelength of a semiconductor laser diode varies, the photo-detector can obtain stable signals.
    • 提供了即使当从光源发射的光的波长变化时也可以精确地检测聚焦误差的光学拾取头。 全息元件衍射由光盘反射的光束以获得+/- 1次衍射光束,并且具有使用菲涅耳带片形成的衍射区域和用于遮蔽反射光束的遮光区域。 光电检测器具有四个元件的光接收区域。 光检测器检测由衍射区域衍射并由凸透镜聚焦的+/- 1级衍射光束,并将这些光束转换成电信号。 光检测器设置在由凸透镜形成的-1级衍射光束的焦点之间的大致中点处。 由于即使当半导体激光二极管的激光波长变化时,中点也不会移动,所以光电检测器可以获得稳定的信号。