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    VARIABLE FOCAL LENGTH LENS SYSTEM WITH OPTICAL POWER MONITORING
    1.
    发明公开
    VARIABLE FOCAL LENGTH LENS SYSTEM WITH OPTICAL POWER MONITORING 审中-公开

    公开(公告)号：EP3462236A1

    公开(公告)日：2019-04-03

    申请号：EP18197601.0

    申请日：2018-09-28

    申请人： Mitutoyo Corporation

    发明人： GLADNICK, Paul Gerard ,  BRYLL, Robert Kamil

    IPC分类号： G03B13/36 ,  G03B43/00 ,  G02B21/36 ,  G01N21/00 ,  G02B27/16 ,  G02B7/28 ,  G02B21/00

    摘要： A variable focal length (VFL) lens system is provided including a VFL lens, a VFL lens controller, an objective lens, a camera and an optical power monitoring configuration. During a standard workpiece imaging mode, the objective lens transmits workpiece light along an imaging optical path through the VFL lens to the camera, which provides a corresponding workpiece image exposure. During an optical power monitoring mode, the optical power monitoring configuration produces a monitored beam pattern which travels along at least a portion of the imaging optical path through the VFL lens to the camera, which provides a monitoring image exposure. Different monitoring image exposures are acquired at different phase timings of the periodic modulation of the VFL lens, and a dimension of the monitored beam pattern is measured in each monitoring image exposure as related to an optical power of the VFL lens at the corresponding phase timing.

    Focusing error detecting apparatus
    5.
    发明公开
    Focusing error detecting apparatus 失效
    Detektorvorrichtung zur Messung der Abweichung der Scharfeinstellung。

    公开(公告)号：EP0351675A2

    公开(公告)日：1990-01-24

    申请号：EP89112505.6

    申请日：1989-07-07

    申请人： MITSUBISHI DENKI KABUSHIKI KAISHA

    发明人： Seya, Masatomo Mitsubishi Denki K.K. ,  Tadokoro, Michihiro Mitsubishi Denki K.K. ,  Okada, Kazuo Mitsubishi Denki K.K.

    IPC分类号： G02B7/09 ,  G02B27/16 ,  G11B7/09 ,  G02B7/28

    CPC分类号： G11B7/1381 ,  G02B27/16 ,  G11B7/0908 ,  G11B7/0916 ,  G11B7/13

    摘要： A focusing error detecting apparatus comprises an objective lens system (5) for focusing a ray flux on a surface (2) of an optical recording disk (1), two photo detectors (13a, 13b), an optical means (4, 5, 6) including the lens system (5) and a beam splitter (6), for focusing a ray flux reflected from the optical recording disk (1) so that the ray flux comes to the middle of a space formed between the two photo detectors (13a, 13b) when the focal point is formed on the optical recording disk, a combination of two interruption/deflection elements (26a, 26b) and a control device (31) for switching the ray flux transmitted from the optical recording disk (1) at the two positions which correspond to said two photo detectors, two sampling/hol­ding circuits (29, 30) respectively hold differences of output of the two photo detectors (13a, 13b) in correspon­dence to the switching operations of the interruption/de­flection elements (26a, 26b) and the control device (31), and a subtracting circuit (28) for outputting a focusing error signal (S f ) on the basis of the outputs of the samp­ling/holding circuits (29, 30).

    摘要翻译： 聚焦误差检测装置包括用于将光线通量聚焦在光记录盘（1）的表面（2）上的物镜系统（5），两个光检测器（13a，13b），光学装置（4,5） 6），包括透镜系统（5）和分束器（6），用于聚焦从光记录盘（1）反射的光线，使得光线通量到达形成在两个光电检测器之间的空间的中间 当在光记录盘上形成焦点时，两个中断/偏转元件（26a，26b）和用于切换从光记录盘（1）传输的光线通量的控制装置（31）的组合， 在对应于所述两个光电检测器的两个位置处，两个采样/保持电路（29,30）分别对应于中断/偏转元件的切换操作保持两个光电检测器（13a，13b）的输出的差异（ 26a，26b）和控制装置（31），以及减法电路 （28），用于基于采样/保持电路（29,30）的输出输出聚焦误差信号（Sf）。

    Focus detector
    6.
    发明公开
    Focus detector 失效
    Fokusdetektor。

    公开(公告)号：EP0259148A2

    公开(公告)日：1988-03-09

    申请号：EP87307745.7

    申请日：1987-09-02

    申请人： CANON KABUSHIKI KAISHA ,  CANON DENSHI KABUSHIKI KAISHA

    发明人： Matsui, Hiroshi ,  Koyama, Osamu ,  Yano, Hideaki ,  Nakamura, Yasuo

    IPC分类号： G11B7/09 ,  G02B7/28 ,  G02B27/16

    CPC分类号： G11B7/1381 ,  G02B27/16 ,  G11B7/0908 ,  G11B7/0916

    摘要： A focus detector which comprises as follows:

    means (1 to 4) for irradiating a focused light beam to a surface (5) to be examined;
    an optical element (7) located in a vicinity of a focus point of a detection light beam formed by the irradiation light beam reflected by or passed through the surface and refocused;
    said optical element splitting a portion of the detection light beam only when the irradiation light beam is not in an in-focus state on the surface; and means (10) for receiving the light beam split by said optical element so as to detect a focus error signal.

    摘要翻译： 一种聚焦检测器，包括：用于将聚焦光束照射到被检查表面（5）的装置（1至4）; 光学元件（7），其位于由被所述表面反射或通过所述表面并被重新聚焦的所述照射光束形成的检测光束的焦点附近; 所述光学元件仅在所述照射光束在所述表面上不处于聚焦状态时分离所述检测光束的一部分; 以及用于接收由所述光学元件分割的光束以便检测聚焦误差信号的装置（10）。

    DYNAMIC FOCUSING HEAD MOUNTED DISPLAY
    7.
    发明公开
    DYNAMIC FOCUSING HEAD MOUNTED DISPLAY 审中-公开

    公开(公告)号：EP4167020A1

    公开(公告)日：2023-04-19

    申请号：EP22211674.1

    申请日：2016-10-28

    申请人： e-Vision Smart Optics Inc.

    发明人： VAN HEUGTEN, Anthony

    IPC分类号： G02B27/40 ,  G02B7/04 ,  G02B27/01 ,  G02B27/10 ,  G02B27/16

    摘要： A conventional head-mounted display (HMDs) can display a virtual image at a fixed focus (e.g., infinite focus). If the user looks at an object that appears closer than the virtual image, then accommodation by the user's eyes will cause the virtual image to appear blurry. The HMDs disclosed herein include a dynamic electro-active focusing element that changes the focus of the virtual image to account for accommodation by the user. This dynamic electro-active focusing element may include a curved layer of electro-active material, such as nematic or bi-stable (e.g., cholesteric) liquid crystal, disposed between a static concave mirror and a convex surface on a beam splitter or other optical element. Changing the refractive index of the electro-active material causes the focus of the dynamic electro-active focusing element, making it possible to shift the virtual image's focus in as the user's eyes change focus.

    OPTICAL SYSTEM FOR FORMING NON-CIRCULAR IMAGE OF LIKEWISE-SHAPED LIGHT SOURCE ON WORKPIECE LOCATED IN WAIST OF LASER BEAM
    10.
    发明公开
    OPTICAL SYSTEM FOR FORMING NON-CIRCULAR IMAGE OF LIKEWISE-SHAPED LIGHT SOURCE ON WORKPIECE LOCATED IN WAIST OF LASER BEAM 审中-公开
    光学系统，用于生产非圆形形状也光源的图像上的工作放在激光束的中间部分

    公开(公告)号：EP2855076A2

    公开(公告)日：2015-04-08

    申请号：EP13837131.5

    申请日：2013-05-29

    申请人： IPG Photonics Corporation

    发明人： ERBATOV, Timur

    IPC分类号： B23K26/06 ,  G02B27/16 ,  H01S3/10

    CPC分类号： G02B13/0005 ,  G02B6/4296 ,  G02B27/0927 ,  G02B27/0955 ,  H01S3/005

    摘要： An optical system for forming a final image of a non-circular light source on a workpiece with a desired non-circular cross-section and desired size B includes a plurality of spaced leases. The plurality of lenses are arranged with spaced upstream and downstream lenses which are configured to transmit the beam emitted by the light source. The optical system is configured with an F-theta lens spaced downstream from the downstream lens and converging the beam incident thereon so that the beam has a final waist. The F-theta and downstream lenses are spaced apart so that -, wherein F4 a positive focal length of the downstream lens, Fth is the negative focus of the F-theta lens, B is the desired size of the final image, and A is a size of a preliminary noncircular image of the source different from the desired size B.