-
公开(公告)号：EP0459939B2
公开(公告)日：2003-09-10
申请号：EP91710020.8
申请日：1991-05-27
IPC分类号： G01P15/125 , H01G5/04 , H05K1/16
CPC分类号： G01P15/125 , G01P15/18
-
公开(公告)号：EP0578536B1
公开(公告)日：1998-08-26
申请号：EP93401668.4
申请日：1993-06-29
发明人： Kawaguchi, Eiji, c/o Copal Company Limited , Itoh, Katsuyoshi, c/o Fujitsu Limited , Imamura, Fuminori, c/o Fujitsu Limited
IPC分类号： G11B33/02 , G11B17/04 , G11B15/675
CPC分类号： G11B33/027 , G11B15/675 , G11B17/04 , G11B17/0405
-
公开(公告)号：EP0459939B1
公开(公告)日：1995-04-05
申请号：EP91710020.8
申请日：1991-05-27
IPC分类号： G01P15/125 , H01G5/04 , H05K1/16
CPC分类号： G01P15/125 , G01P15/18
-
公开(公告)号：EP0441709A3
公开(公告)日：1992-01-22
申请号：EP91400295.1
申请日：1991-02-07
发明人： Yoshikawa, Yukio , Ishii, Takeshi , Oyama, Yoshihiro , Sasaki, Tatsuo , Takahashi, Tamotsu , Sato, Shinichi , Moriya, Kazumasa , Shinoda, Ichiro , Itoh, Motohiko , Kashiwazaki, Tomoyuki , Kawai, Hiroaki , Watanabe, Mitsuo
CPC分类号： G06K7/10851 , G06K2207/1018 , H01S5/06825 , H01S5/06835
摘要： A semiconductor laser driving circuit has a semiconductor laser (1) for emitting a laser beam according to a drive power. A photodetector (1b) is provided for effecting photo-electric conversion of the laser beam to output a corresponding electric signal. A monitoring circuit (101) is connected for monitoring the electric signal to output a monitor signal indicative of variation in intensity of the laser beam. A controlling signal (102) is connected for comparing the monitor signal with a given reference signal to output a control signal according to difference therebetween. A powering circuit (103) is operative according to the control signal to apply to the semiconductor laser a drive power effective to eliminate the difference. An abnormality detecting circuit is provided for comparing the monitor signal with a given limit signal which is set defferent from the reference signal to detect any abnormality and output a corresponding signal.
-
公开(公告)号：EP0359670A3
公开(公告)日：1991-07-24
申请号：EP89402525.3
申请日：1989-09-14
发明人： Takagi, Masaaki
CPC分类号： G11B7/09 , G11B7/0932
摘要： Light is condensed on a recording medium (20) by an objective lens (11), and light reflected from the recording medium passes through the objective lens and is split into light along two optical paths (P,5) via a condenser lens (5) and beam splitter (6). A light-receiving surface (7) having an area smaller than that of the irradiation pattern of the returned light when the objective is focused is disposed on the inner side of a focal point on one optical path, and an identical light-receiving surface (8) is disposed on the outer side of a focal point on the other optical path. The arrangement is such that the photoelectric outputs of the two light-receiving surfaces (7,8) coincide when the objective lens (11) is focused. Preferably, the light-receiving surface is divided into four portions by a straight line, which is obtained by projecting the track direction of the recording medium, and a region having line symmetry with respect to the straight line and an area smaller than that of the irradiation pattern when the objective is focused. A tracking error signal of the objective lens (11) is obtained by correcting a difference signal between light-receiving surfaces on the inner side by a low-frequency component of a difference signal between light-receiving surfaces on the outer side.
摘要翻译： 光通过物镜（11）会聚在记录介质（20）上，并且从记录介质反射的光通过物镜并且经由聚光透镜（5）沿着两个光路（P，5）分离成光 ）和分束器（6）。 当物镜聚焦时，面积小于返回光的照射图案面积的光接收面（7）设置在一个光路上的焦点的内侧上，并且相同的光接收面（ 8）设置在另一光路上的焦点的外侧上。 当物镜（11）聚焦时，两个光接收表面（7,8）的光电输出一致。 优选地，光接收表面通过投影记录介质的轨道方向而获得的直线和相对于直线具有线对称性的区域以及小于该直线的区域被划分为四个部分 当目标集中时的照射模式。 物镜（11）的跟踪误差信号是通过将外侧的光接收表面之间的差信号的低频分量校正内侧的光接收表面之间的差信号而获得的。
-
公开(公告)号：EP0323320A3
公开(公告)日：1990-05-30
申请号：EP88403276.4
申请日：1988-12-21
CPC分类号： G11B7/1353 , G11B7/09
摘要： An optical head (200) usable also for an WORM-type optical disk device includes a diffracting optical system (7, 8) which is located on the optical path of a light beam and which diffracts the light beam so as to produce at least three diffracted light beams, and three light-receiving elements which receive the reflected light beams of the three diffracted light beams from the surface of an optical disk. The diffracting optical system is arranged so as to establish a positional relationship in which the three or more diffracted light beams do not lie on a single straight line in the cross-sectional distribution thereof. Among the three diffracted light beams, one lying at the foremost or rearmost position in the forward rotating direction of the optical disk is employed for generating a focusing servo signal or for reading or writing data, and the remaining two are employed for generating a tracking servo signal.
-
公开(公告)号：EP0359670A2
公开(公告)日：1990-03-21
申请号：EP89402525.3
申请日：1989-09-14
发明人： Takagi, Masaaki
CPC分类号： G11B7/09 , G11B7/0932
摘要： Light is condensed on a recording medium (20) by an objective lens (11), and light reflected from the recording medium passes through the objective lens and is split into light along two optical paths (P,5) via a condenser lens (5) and beam splitter (6). A light-receiving surface (7) having an area smaller than that of the irradiation pattern of the returned light when the objective is focused is disposed on the inner side of a focal point on one optical path, and an identical light-receiving surface (8) is disposed on the outer side of a focal point on the other optical path. The arrangement is such that the photoelectric outputs of the two light-receiving surfaces (7,8) coincide when the objective lens (11) is focused. Preferably, the light-receiving surface is divided into four portions by a straight line, which is obtained by projecting the track direction of the recording medium, and a region having line symmetry with respect to the straight line and an area smaller than that of the irradiation pattern when the objective is focused. A tracking error signal of the objective lens (11) is obtained by correcting a difference signal between light-receiving surfaces on the inner side by a low-frequency component of a difference signal between light-receiving surfaces on the outer side.
摘要翻译： 光通过物镜（11）在记录媒体（20）上聚光，从记录介质反射的光经过物镜，经由聚光透镜（5）分离成沿着两条光路（P，5）的光 ）和分束器（6）。 当物镜被聚焦时，具有小于返回光的照射图案的面积的光接收表面（7）设置在一个光路上的焦点的内侧，以及相同的光接收表面 8）设置在另一光路上的焦点的外侧。 该布置使得当物镜（11）被聚焦时，两个光接收表面（7,8）的光电输出重合。 优选地，光接收表面通过投影记录介质的轨道方向获得的直线和相对于直线具有线对称性的区域和小于 当目标集中时的照射模式。 通过在外侧的光接收表面之间的差信号的低频分量校正内侧的光接收表面之间的差信号来获得物镜（11）的跟踪误差信号。
-
公开(公告)号：EP0591550A1
公开(公告)日：1994-04-13
申请号：EP93908115.4
申请日：1993-04-20
CPC分类号： G01D5/34792 , G01D5/2497 , H03M1/26
摘要： An absolute encoder comprises a moving member in which track groups (T₂ and T₁) consisting of a plurality of slit patterns bit-coded in accordance with digital code representing an absolute address such as a binary-coded quaternary code are parallelly arranged in a form from higher bits to lower bits; a light source for illuminating the member; photodetecting elements (1 and 2) which output detection signals (A₀⁺ + to A₃⁻) for each track by receiving the illuminated light through the slit patterns; and processing means for processing the detected signals to generate bit reproducing signals (P₀ to P₃) and read the absolute addresses of the moving member by decoding. This processing means is provided with operating means (3 to 20) for generating the high order bit reproducing signals (P₂ and P₃) which are synchronized with the rising or falling of the low order bit reproducing signal (P₀) by operating the low order detection signals (A₀⁺ to A₀⁻) obtained from the lower bit track (T₁) and the high order detection signals (A₂⁺ to A₃⁻) obtained from the higher order bit track (T₂). If the number of the tracks is increased, it is necessary to provide an arrangement in which the light which illuminates the lower order bit track is received through a magnifying optical system and at the same time, the light which illuminates the track on the high order bit side is received directly.
摘要翻译： 一种绝对式编码器包括一个移动部件，其中由按照代表绝对地址的数字代码比特编码的多个狭缝图案组成的轨道组（T 2和T 1）以二进制编码的四元代码的形式从 高位到低位; 用于照亮构件的光源; 光检测元件（1和2），它通过狭缝图案接收照明光而输出用于每个光道的检测信号（A 0 + +到A 3 - ）; 和处理装置，用于处理检测到的信号以产生位重放信号（P 0到P 3）并通过解码读取移动部件的绝对地址。 该处理装置配备有操作装置（3至20），用于通过操作低阶检测器（3）产生与低阶位重放信号（P 0）的上升或下降同步的高阶位重放信号（P 2和P 3） 从较低位轨道（T 1）获得的信号（A 0+至A 0 - ）和从较高位轨道（T 2）获得的高阶检测信号（A 2 +至A 3- - ）。 如果轨道的数量增加，则有必要提供一种配置，其中通过放大光学系统接收照射低阶位轨道的光，同时，照射高阶轨道的光 位侧直接接收。
-
公开(公告)号：EP0323289B1
公开(公告)日：1992-09-30
申请号：EP88403062.8
申请日：1988-12-02
CPC分类号： G11B5/4886 , G11B17/32
-
10.发明公开Capacitive acceleration sensor with free diaphragm 失效Kapazitiver Beschleunigungsaufnehmer mit freier Membran。
公开(公告)号：EP0459939A1
公开(公告)日：1991-12-04
申请号：EP91710020.8
申请日：1991-05-27
IPC分类号： G01P15/125 , H01G5/04 , H05K1/16
CPC分类号： G01P15/125 , G01P15/18
摘要： The acceleration sensor has a first stationary substrate (1) having a stationary electrode (17u) and a second stationary substrate (2) having another stationary electrode (30 ℓ) and being opposed to the first stationary substrate (1) with a given spacing. An electrically conductive diaphragm (3) is disposed in the spacing and has a central segment (26) fixed in the spacing through the pair of stationary substrates (1, 2) and a peripheral segment (25m) surrounding around and extending resiliently from the central segment (26) to undergo displacement in the spacing relative to the stationary electrodes (17u, 30 ℓ) in response to an external acceleration force. The peripheral segment (25m) and the opposed stationary electrodes (17u, 30 ℓ) form variable capacitors effective to produce a capacitance change in response to the displacement of the peripheral segment (25m) to detect the external acceleration force.
摘要翻译： 加速度传感器具有具有固定电极（17u）的第一固定基板（1）和具有另一个固定电极（30l）的第二固定基板（2），并以给定的间隔与第一固定基板（1）相对。 导电隔膜（3）以间隔设置，并且具有通过一对固定基板（1,2）以间隔固定的中心段（26）和周边段（25m），周边段（25m）围绕中心段 （26）相对于固定电极（17u，30l）以相对于外部加速力的间隔发生位移。 外围段（25m）和相对的固定电极（17u，30l）形成可变电容器，其有效地响应于外围段（25m）的位移产生电容变化，以检测外部加速力。
-
-
-
-
-
-
-
-
-
搜索结果
22 条记录 (耗时 0.012 秒)
