公开(公告)号：US4458144A

公开(公告)日：1984-07-03

申请号：US279100

申请日：1981-06-30

申请人： Charles Reilly ,  Leonard Laub ,  Dennis Rose

发明人： Charles Reilly ,  Leonard Laub ,  Dennis Rose

IPC分类号： G02B7/28 ,  G11B7/09 ,  G11B7/135 ,  G01J1/36

CPC分类号： G11B7/0909 ,  G11B7/1378

摘要： Apparatus for reading information stored in a track pattern on a radiation reflecting record comprises a source of radiation such as a laser for supplying at least a reading beam, an objective lens assembly for passing the reading beam to the record and for controllably focusing the reading beam at a plane of focus, a photodetector array disposed in an optical path with the lens assembly for sensing at least the recorded information and focusing errors, and an astigmatic element disposed in the optical path for producing an astigmatic image of the reading beam in which the photodetector array comprises a unitary data photodetector disposed for impingement thereon of a zero order reading beam component for sensing the recorded information, and a quadrant photodetector array adjacent to the unitary data photodetector and including separated sectors disposed along orthogonal axes for sensing relative differences of the astigmatic image along the orthogonal axes to provide at least focus error correction signals to the objective lens assembly.

摘要翻译： 用于读取在辐射反射记录上以轨道图案存储的信息的设备包括用于至少提供读取光束的用于提供至少读取光束的激光源，用于将读取光束传递到记录并用于可控地聚焦读取光束 在焦点平面处，设置在光路中的光检测器阵列与用于感测至少记录的信息和聚焦误差的透镜组件以及设置在光路中的散光元件以产生读取光束的像散图像，其中 光电检测器阵列包括一个单一的数据光电检测器，设置成用于检测记录的信息的零级读取光束分量，以及与单一数据光电检测器相邻的象限光电检测器阵列，并且包括沿着正交轴设置的分离的扇区，用于感测散光的相对差异 图像沿着正交轴提供至少焦点e 对物镜组件的反射校正信号。

公开(公告)号：US4451729A

公开(公告)日：1984-05-29

申请号：US394804

申请日：1982-07-02

申请人： Tadao Takagi ,  Nobuo Okabe

发明人： Tadao Takagi ,  Nobuo Okabe

IPC分类号： G03B13/36 ,  G02B7/28 ,  G02B7/34 ,  G03B3/10 ,  G03B13/34 ,  G01J1/36

CPC分类号： G02B7/34

摘要： A device for automatically focusing an objective lens includes detecting means capable of detecting the positional relation of the objective lens with respect to an in-focus position at which an image of an object is formed on a predetermined focal plane, means including an electric motor and moving the objective lens toward the in-focus position by the motor, and means for controlling the driving of the motor in response to the detecting means. The control means includes a power supply circuit means for connecting the motor to a power source, a braking circuit means for short-circuiting the two terminals of the motor, and means for alternately operating the power supply circuit means and the braking circuit means to thereby decelerate the revolution of the motor when the objective lens is within a predetermined range near the in-focus position.

摘要翻译： 用于自动聚焦物镜的装置包括能够检测物镜相对于在预定焦平面上形成物体的图像的对焦位置的位置关系的检测装置，包括电动机的装置和 通过马达将物镜朝向对焦位置移动，以及用于响应于检测装置控制马达的驱动的装置。 控制装置包括用于将电动机连接到电源的电源电路装置，用于短路电动机的两个端子的制动电路装置，以及用于交替地操作电源电路装置和制动电路装置的装置，从而 当物镜在对焦位置附近的预定范围内时，减速马达的旋转。

公开(公告)号：US4394569A

公开(公告)日：1983-07-19

申请号：US218132

申请日：1980-12-19

申请人： Kazuo Nakamura

发明人： Kazuo Nakamura

IPC分类号： G03B13/36 ,  G02B7/30 ,  G02B7/34 ,  G02B27/16 ,  G01J1/36

CPC分类号： G02B27/16 ,  G02B7/305

摘要： An automatic focusing device and method for a camera in which the distance and direction to the focused position of a focusing lens of the camera are quickly determined after which the lens is moved directly to the focused position without the necessity of carrying out calculations as the lens is moved. Images of an object being viewed through the lens are projected onto first and second sensor groups. The outputs of the sensor groups are digitized then calculations are performed to determine the distance and direction to the position of correct focus. The lens is then moved to the focused position directly in accordance with the computed values.

摘要翻译： 一种用于相机的自动对焦装置和方法，其中快速确定与相机的聚焦透镜的聚焦位置的距离和方向，之后透镜直接移动到聚焦位置，而不需要进行计算作为透镜 被移动 通过透镜观看的物体的图像被投影到第一和第二传感器组上。 传感器组的输出被数字化，然后执行计算以确定与正确焦点位置的距离和方向。 然后根据计算值将透镜直接移动到聚焦位置。

公开(公告)号：US4357533A

公开(公告)日：1982-11-02

申请号：US168812

申请日：1980-07-14

申请人： John S. Winslow

发明人： John S. Winslow

IPC分类号： G02B7/28 ,  G02B27/40 ,  G11B7/085 ,  G11B7/09 ,  G01J1/36

CPC分类号： G11B7/0912 ,  G02B27/40

摘要： Electro-optical focus detection apparatus for providing a signal indicative of the magnitude and polarity of focus error in a light beam impinging on a surface, such as a recording surface in a recording or playback system. The detector includes a beam splitter for dividing the beam reflected from the recording surface into two reflected beams of equal power, and includes an aperture placed in the path of the two reflected beams. The first reflected beam converges at a focal point before encountering the aperture and the second reflected beam converges at a focal point after encountering the aperture, both beams thereafter impinging upon separate photodetector elements. The aperture reduces the light incident on the photodetectors from both reflected beams, and the apparatus is so configured that the powers of the reflected beams incident on the photodetector elements are identical when the original beam is in focus on the recording surface. When the original beam moves out of focus with the recording surface, both focal points of the reflected beams move in the same direction, to provide an increase in the light falling on one of the photodetector elements and a decrease in light falling on the other, such that the differential output derived from the photodetector elements provides a signal indicative of the magnitude and polarity of the focus error.

摘要翻译： 电光焦点检测装置，用于提供指示入射在诸如记录或播放系统中的记录表面的表面上的光束中的聚焦误差的大小和极性的信号。 检测器包括用于将从记录表面反射的光束分成两个相等功率的反射光束的分束器，并且包括放置在两个反射光束的路径中的孔。 第一反射光束在遇到光圈之前聚焦在焦点处，并且第二反射光束在遇到光圈之后会聚在焦点处，两个光束之后撞击到分开的光电探测器元件上。 孔径减小了从两个反射光束入射到光电检测器上的光，并且该装置被配置为当原始光束聚焦在记录表面上时入射到光电探测器元件上的反射光束的功率是相同的。 当原始光束与记录表面移动离焦时，反射光束的两个焦点沿相同的方向移动，以增加落在一个光电检测器元件上的光的增加和另一个上的光的减少， 使得从光电检测器元件导出的差分输出提供指示聚焦误差的大小和极性的信号。

公开(公告)号：US4287413A

公开(公告)日：1981-09-01

申请号：US48421

申请日：1979-06-14

申请人： Hitoshi Kanamaru

发明人： Hitoshi Kanamaru

IPC分类号： G06K7/015 ,  G02B7/28 ,  G05D3/14 ,  G11B7/09 ,  G01J1/36

CPC分类号： G11B7/0909 ,  G02B7/28 ,  G05D3/14

摘要： A focus servo apparatus for an optical information reading system is disclosed, which includes an optical system for a light from an information carrying surface of a recording medium composed of a condenser lens, a cylindrical lens and a light receiving element. A subsystem is employed for maintaining light illuminating focussed on the information carrying surface in response to an output of the light receiving element. The distance between the cylindrical lens and the light receiving element is larger than the focus distance of the lenticular lens.

摘要翻译： 公开了一种用于光信息读取系统的聚焦伺服装置，其包括用于由聚光透镜，柱面透镜和光接收元件组成的记录介质的信息承载表面的光的光学系统。 子系统用于响应于光接收元件的输出而保持聚焦在信息承载表面上的光照。 柱面透镜和受光元件之间的距离大于双凸透镜的焦距。

公开(公告)号：US4283142A

公开(公告)日：1981-08-11

申请号：US108461

申请日：1979-12-31

申请人： Hubert De Steur ,  Chris Vandenbossche ,  Guido Heyneman

发明人： Hubert De Steur ,  Chris Vandenbossche ,  Guido Heyneman

IPC分类号： G01N21/27 ,  G01J1/36 ,  G01J3/08 ,  G01J3/42

CPC分类号： G01J1/36

摘要： A two beam alternating light colorimeter is disclosed wherein a light beam passing through a lens system having a shutter is periodically deflected by a pivoting mirror. In a first non-deflecting position of the pivotable mirror a first measuring beam is created which passes through a first measuring cell and is guided to a common photo cell. In a second deflecting position of the mirror a second measuring beam is created which is guided through a second measuring cell to the same photo cell. Signals from the photo cell are connected through a controlled switching element to an analog memory. A computing circuit is provided which connects to an output of the analog memory and also to the photo cell. The switching element connects the first measuring signal to the analog memory when the mirror is in a non-deflecting position and opens when the mirror is in a deflecting position. The computing circuit compares the signals corresponding to the first and second measuring beams.

摘要翻译： 公开了一种双光束交替光色度计，其中通过具有快门的透镜系统的光束由枢转反射镜周期性地偏转。 在可枢转镜的第一非偏转位置中，产生通过第一测量池并被引导到公共光电池的第一测量光束。 在反射镜的第二偏转位置中，产生第二测量光束，其被引导通过第二测量单元到相同的光电池。 来自光电池的信号通过受控的开关元件连接到模拟存储器。 提供了一种连接到模拟存储器的输出端以及光电池的计算电路。 当反射镜处于非偏转位置时，开关元件将第一测量信号连接到模拟存储器，并且当反射镜处于偏转位置时打开。 计算电路比较对应于第一和第二测量光束的信号。

公开(公告)号：US4273998A

公开(公告)日：1981-06-16

申请号：US49862

申请日：1979-06-18

申请人： Hitoshi Kanamaru

发明人： Hitoshi Kanamaru

IPC分类号： G06K7/015 ,  G02B7/28 ,  G11B7/09 ,  G01J1/36

CPC分类号： G11B7/0903 ,  G11B7/0909 ,  G11B7/1378

摘要： A servo unit in an optical information reading device having a lens for focussing an irradiation light beam on the record surface of a disk. A movable mirror positions the focal point of the irradiation light beam formed on the track of the disk. A cylindrical lens is arranged so that the central axis of the cylinder forms a 45.degree. angle with the track direction of the disk to allow a light beam from the record surface to pass through the cylindrical lens. A focussing light receiver having four separate light receiving units is arranged on two orthogonal straight lines. The focussing light receiver receives a focus controlling light beam passed through the cylindrical lens at a distance twice as long as the focal distance of the cylindrical lens. A pair of tracking light receiving elements are provided on both sides of the focussing light receiver such that the light receiving surfaces are flush with the light receiving surface of the focussing light receiver and arranged linearly to receive a pair of tracking controlling light beams. The focal point of the irradiation light beam formed by said focussing lens is positioned on the record surface in response to an output of the focussing light receiver. The movable mirror is adjusted so that the focal point is positioned on the track in response to outputs of the pair of tracking light receiving elements and the focussing light receiver is arranged so that one of the two straight lines coincides with the central line of the cylinder of the cylindrical lens.

摘要翻译： 光信息读取装置中的伺服单元，其具有用于将照射光束聚焦在盘的记录表面上的透镜。 可移动镜定位形成在盘的轨道上的照射光束的焦点。 圆柱形透镜被布置成使得圆筒的中心轴线与盘的轨道方向形成45度角，以允许来自记录表面的光束通过柱面透镜。 具有四个分开的光接收单元的聚焦光接收器布置在两条正交的直线上。 聚焦光接收器以与柱面透镜的焦距相同的距离接收通过柱面透镜的聚焦控制光束。 一对跟踪光接收元件设置在聚焦光接收器的两侧，使得光接收表面与聚焦光接收器的光接收表面齐平并且线性布置以接收一对跟踪控制光束。 由所述聚焦透镜形成的照射光束的焦点响应于聚焦光接收器的输出位于记录表面上。 调整可移动镜，使得焦点响应于一对跟踪光接收元件的输出而位于轨道上，并且聚焦光接收器被布置成使得两条直线中的一条直线与圆柱体的中心线重合 的柱面透镜。

公开(公告)号：US4250376A

公开(公告)日：1981-02-10

申请号：US58964

申请日：1979-07-20

申请人： James D. Joseph ,  Dennis J. Wilwerding

发明人： James D. Joseph ,  Dennis J. Wilwerding

IPC分类号： G02B7/30 ,  G01J1/36

CPC分类号： G02B7/30

摘要： Apparatus for determining the direction a lens should be moved in order to provide a proper focus of a remote object on a predetermined plane. A plurality of radiation detectors are positioned to receive radiation in first and second patterns from the object and to produce signals in accordance therewith. A first group of radiation detectors, produces signals indicative of the radiation received on the first pattern while a second group of radiation detectors produces signals indicative of the radiation received, in the second pattern. The two patterns coincide at the proper focus but at other than the proper focus position, the two patterns are spaced from one another in a direction which depends upon the direction the lens should be moved to achieve proper focus. The absolute value of the difference between the signal from a first detector in the first pattern and the signal from a first detector in the second pattern is compared with the absolute value of the difference between the signal from a second detector in the first pattern and the signal from a second detector in the second pattern. The result is summed over a predetermined range and a characteristic of the summed value is indicative of the direction the lens should be moved for proper focus.

摘要翻译： 用于确定透镜应该被移动的方向以便在预定平面上提供远程物体的适当对焦的装置。 定位多个辐射检测器以接收来自物体的第一和第二图案中的辐射并根据其产生信号。 第一组辐射检测器产生指示在第一图案上接收的辐射的信号，而第二组辐射探测器以第二图案产生指示所接收的辐射的信号。 两个图案在适当的焦点处重合，但是除了适当的对焦位置之外，两个图案在取决于透镜应该被移动的方向以实现适当的聚焦的方向上彼此间隔开。 将来自第一图案的第一检测器的信号与第二图案中的来自第一检测器的信号之间的差的绝对值与来自第一图案中的第二检测器的信号与第一图案的信号的绝对值 来自第二图案中的第二检测器的信号。 结果在预定范围内相加，并且相加值的特征表示透镜应该被移动以便正确聚焦的方向。

公开(公告)号：US4249073A

公开(公告)日：1981-02-03

申请号：US16595

申请日：1979-03-01

申请人： Norman L. Stauffer ,  Dennis J. Wilwerding

发明人： Norman L. Stauffer ,  Dennis J. Wilwerding

IPC分类号： G03B13/36 ,  G01C3/32 ,  G02B7/34 ,  G01J1/36

CPC分类号： G01C3/32 ,  G02B7/34

摘要： A method and apparatus for determining the direction the taking lens of a camera should be moved in order to provide a proper focus condition. A plurality of radiant energy detectors are positioned to receive energy from a scene being viewed and a first group of such detectors produces a first output signal pattern while a second group of such detectors produces a second output signal pattern. The two patterns coincide at the desired focus position but move with respect to one another in a first or opposite direction depending upon the focus condition. The slope of one or both of the patterns at predetermined positions is multiplied by the difference in value from the outputs of the detectors to create values which are summed. The sign of the summed values is representative of the direction the taking lens must be moved to bring the patterns into coincidence at the desired focus position.

摘要翻译： 用于确定摄像机拍摄镜头的方向应移动的方法和装置，以便提供适当的对焦条件。 定位多个辐射能量检测器以从正在观看的场景接收能量，并且第一组这样的检测器产生第一输出信号模式，而第二组这样的检测器产生第二输出信号模式。 两个图案在期望的焦点位置处重合，但是根据焦点条件在第一或相反方向上相对于彼此移动。 在预定位置处的一个或两个图案的斜率乘以与检测器的输出值的差值，以创建相加的值。 总和值的符号代表拍摄镜头必须移动以使图案在所需焦点位置重合的方向。

公开(公告)号：US4247762A

公开(公告)日：1981-01-27

申请号：US965361

申请日：1978-11-30

申请人： Dennis J. Wilwerding

发明人： Dennis J. Wilwerding

IPC分类号： G02B7/30 ,  G01J1/36

CPC分类号： G02B7/305

摘要： An improved automatic focus system wherein circuitry is provided to inhibit the focusing function when the scene being viewed provides too little contrast for satisfactory operation.

摘要翻译： 一种改进的自动对焦系统，其中提供电路以在被观看的场景对令人满意的操作提供太小的对比度时抑制聚焦功能。