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    • 2. 发明专利
    • TWO-DIMENSIONAL LASER DOPPLER SPEEDOMETER
    • JPH02268286A
    • 1990-11-01
    • JP9039089
    • 1989-04-10
    • NIPPON SHEET GLASS CO LTDHIKARI SANGYO GIJUTSU SHINKO K
    • NISHI HISAMI
    • G01S7/48G01S17/58
    • PURPOSE:To simplify an optical system by a method wherein a frequency modulation of luminous fluxes is performed individually and an optical system for generation of reference light is inserted into one luminous flux to let a speed signal radio wave after a detection pass through a band pass filter. CONSTITUTION:An ultrasonic wave deflector 2' and a driver 3' are provided in a beam 5 of laser light divided into two luminous fluxes to generate a primary diffraction light 5' and a half mirror 11 is inserted into an optical path thereof and a light beam separated here is reflected with a mirror 12 to be used as reference light. The detection of light is performed with a photo detector 13. As a result, a signal light passing through a route of 4, 6, 7, 9, 8, 6, 11 and 13 is given a light angle frequency of the formula I. So, DELTAomegaL>>DELTAomegaX1DELTAomegaL>>DELTAomegay is set to make the signal light pass through an illustrated signal processing circuit. Thus, a cross talk component omega3 in a detection current is removed with a bandpass filter 15 centered on DELTAomegaL to obtain a omega2 component alone with respect to a speed component in a direction (y).
    • 4. 发明专利
    • OPTICAL TYPE DEFECT DETECTOR
    • JPS63173940A
    • 1988-07-18
    • JP700087
    • 1987-01-14
    • NIPPON SHEET GLASS CO LTD
    • NISHI HISAMI
    • G01N21/94G01N21/89G01N21/958
    • PURPOSE:To enable detection of a defect at a high detection accuracy while unnecessiating unidirectional mechanical scanning, by interposing a spatial filter using an array of a lens and a photo detection element to compactive an optical system. CONSTITUTION:When no defect exists in an object 10 to be inspected, parallel light 12 is incident into a refractive index distribution type lens 15 of a lens array 14 as it to be focused with a lens 15 on the outer surface of a cover material 19 of an image sensor 16, but not into a photo detection element 18 as being intercepted with a filter light shielding section 20A. On the other hand, when there is a defect such as scratches and foreign matters on the surface of the object 10 being inspected, incident light is scattered by this defect 21 and light beams scattered are incident into the lens 15 at a certain angle to the optical axis thereof. As a result, light is emitted at a position away from the optical axis and incident into the photo detection element 18 of the sensor passing through a light shielding section 20B in the perimeter of a light shielding section 20A of a spatial filter, namely, a transparent cover material 19 of the image sensor without focusing on a focal plane.
    • 5. 发明专利
    • ELEMENT FOR RECORDING AND REPRODUCING OPTICAL INFORMATION
    • JPS60149016A
    • 1985-08-06
    • JP457584
    • 1984-01-13
    • NIPPON SHEET GLASS CO LTD
    • ICHIKAWA HIROYUKINISHI HISAMITOOYAMA MINORU
    • G02B3/00G02B9/02G02B13/24G11B7/085G11B7/09G11B7/12G11B7/135G11B7/1374
    • PURPOSE:To obtain a small-sized and lightweight optical information recording and reproducing element having small aberration and high optical performance by forming a projected curved surface on the incident surface of light flux and a plane surface on its projected surface and constituting the element of a transparent cylindrical body forming the distribution of refractive indexes gradually reduced from the center axis to the periphery. CONSTITUTION:The element 2 is constituted of a transparent cylindrical body consisting of glass, composite resin, etc. and forming the distribution of refractive indexes gradually reduced in the radius direction from the center axis 5 to the periphery. The direction of the end surface of the element 2 is very important and the end surface 2A with a projected curved surface and the plane end surface 2B should be arranged on the light source 1 side and the recording medium 4 side respectively. If the arrangement of these end surfaces are reversed, light rays projected from the element are projected from a refractive surface on the recording medium side with a relatively large angle to its normal line, so that higher aberration is generated on the refractive surface, the correction of spherical aberration may be lacked at the periphery of the element and out-of-axis characteristics are remarkably deteriorated because of the increment of the unsatisfied quantity of sine conditions. When the end surface of the element on the light source side is formed as the projected curved surface and the end surface on the recording medium side is formed as the plane, the light is refracted twice on both the end surfaces of the element, so that the spherical aberration can be suppressed at a low level and the sine conditions can be satisfied.
    • 6. 发明专利
    • One-dimensional lens
    • 一维镜头
    • JPS58219507A
    • 1983-12-21
    • JP10255582
    • 1982-06-15
    • Nippon Sheet Glass Co Ltd
    • NISHI HISAMI
    • G02B9/00G02B3/00
    • G02B3/00
    • PURPOSE:To enable the constitution of a very small one-dimensional lens and the easy adjustment of a focal length, by polishing and finishing at least one side surface of a transparent circular cylindrical body of which the refractive index decreases parabolically from the central axis toward the periphery and is uniform in the axial direction to a plane parallel with the central axis. CONSTITUTION:Both side surfaces of an optical transmission body 1 of which the refractive index decreases parabolically from a central axis 2 toward the periphery and is uniform in the direction of the axis 2 are polished and finished to the planes 4A, 4B in parallel with the axis 2, whereby an incident face and an exit face for light are formed. Such one-dimensional lens 4 can be constituted in a very small size. The parallel rays made incident to the lens 4 from the face 4A emit from the face 4B and focus on a caustic curve 5. The focal length is easily adjusted simply by changing thickness W.
    • 目的:为了使得能够构造非常小的一维透镜并且容易调节焦距,通过抛光和精加工其中折射率从中心轴线抛物线减少的透明圆柱体的至少一个侧表面朝向 周边并且在轴向方向上与平行于中心轴线的平面均匀。 构成:折射率从中心轴2朝向周边抛物线向轴向2方向均匀的光传输体1的两侧面被抛光并平行于平面4A,4B而与 轴2,由此形成入射面和光的出射面。 这种一维透镜4可以以非常小的尺寸构成。 从面4A入射到透镜4的平行光从面4B发射并聚焦在苛性曲线5上。通过改变厚度W容易地调整焦距。
    • 10. 发明专利
    • JPH05290190A
    • 1993-11-05
    • JP8700492
    • 1992-04-08
    • NIPPON SHEET GLASS CO LTD
    • UENO YUJINISHI HISAMI
    • G01B11/24G01N21/88G01N21/93G06K5/00G06T1/00G06T7/00G06F15/62G06F15/70
    • PURPOSE:To properly judge a defect in an object image to be inspected even unless a binary-coding process is properly done by converting an input image signal into a digital signal and performing the binary-coding process, then extracting feature quantities of independent patterns which do not connect with each other in a reference image, and comparing the feature quantities of corresponding patterns of the reference image and image to be inspected. CONSTITUTION:A master image of a reference mark is inputted by using an input device such as a TV camera. Then this image is converted into binary data and the feature quantities of plural independent patterns in the image are calculated and registered together with their positions. When the object image is inspected, an image of a mark to be inspected is inputted by the TV camera and converted into binary data, and the feature quantities of independent patterns are calculated. The feature quantities are compared with the feature quantities of the independent patterns of the master image which are registered in advance and when the both are different, it is judged that the inspected object mark has a defect.