Abstract: A spiral phase plate, according to one embodiment, for generating a Laguerre Gaussian beam by reflecting an incident beam emitted from a light source, may comprise: a first quadrant area in which the step height increase rate per unit angle decreases progressively in one direction from the point with the lowest step height to the point with the highest step height; and a second quadrant area in which the step height increase rate per unit angle increases progressively in the one direction.

Abstract: A method for evaluating physical properties of a melt-blown plastic resin, and, more specifically, to a novel method for evaluating physical properties are provided. When a particular plastic resin is processed by a melt-blown process, a stretching diameter value after the process of the plastic resin can be accurately derived from a physical property value measured using a specimen of the resin.

Abstract: This invention comprises a sensor (40) having a slit-ray generator (41) and a camera (42), a calibration block (100) for calibrating 3-dimensional coordinate values, a computer (10) for processing 2-dimensional coordinate values of the calibration block (100) and the object (90) to obtain data of 3-dimensional space coordinate and output it to CRT (60), a robot hand (10) for moving the sensor (40) on multiple axes. Therefore, this invention can measure the section profile shape of a tire, etc. accurately and quickly.

Abstract: A robotic hand controls movement of a workpiece relative to three longitudinal axes in response to three control signals and relative to mutually perpendicular rotational axes .alpha. and .beta. in response to two control signals. Two C-shaped holders carry two motors having mutually perpendicular rotating shafts. Each holder includes two parallel flanges connected together by a web. The first motor is mounted on the first holder so its shaft extends between the first holder flanges. A second holder flange is mounted on the first motor shaft between the first holder flanges. The second motor is mounted on the second holder other flange. A carrier for the first holder responds to three of the signals which control movement of the first holder relative to the longitudinal axes.