An electro-acoustic transducer has a piezo-electric film polymer diaphragm which is stressed to a part spherical surface and the periphery of which is clamped. Electrodes placed over the surface of the diaphragm apply an electric field transverse the plane thereof which causes elongation parallel to ...
An audio-transducer incorporates a diaphragm carrying a current conductor and a plurality of permanent magnets constituting a magnet unit disposed in spaced relationship to the conductor. The magnets are formed of a material consisting of magnetizable particles embedded in a matrix of non-magnetic m ...
A method of determining the coordinates of the center of curvature of the curved surface of a workpiece on a surface measurement instrument of the type having a workpiece table rotatably mounted on a main spindle, and a sensor for contacting the surface of a workpiece mounted on the table. The metho ...
Apparatus for producing television picture signals from motion picture film by scanning the film horizontally at a scanning station while transporting the film continuously past the scanning station is provided with means for accommodating different film sizes, transport speeds and film format by ch ...
A liquid crystal display device comprising a plurality of liquid crystal elements each having a respective pair of electrodes which are connected in matrix formation for control purposes. Electrodes on one side of the elements are connected in "rows" and electrodes on the other side of the elements ...
An anti-reflection multiple layer coating is formed on a transparent substrate by successive deposition of an inner layer, at least three intermediate layers and an outer layer, the optical thicknesses of the inner and outer layers being approximately .lambda. /4 and the overall optical thickness of ...
An optical sensing instrument for detecting specular and/or non-specular reflections of light from a surface under test has a sensor head with a plane face having a semi-circular recess in which are housed a plurality of light sources and a plurality of photodetectors each having an associated lens, ...
A transducer assembly for a flat diaphragm transducer of the type having a non-magnetic diaphragm with a conductor in the form of spaced parallel strips on one face with a cooperating magnet structure comprising a plurality of elongate alternate magnetic poles, which can be readily assembled by unsk ...
A selective beam splitting arrangement having a plurality of reflective and/or transmissive surfaces for separating incident image-forming light into a number of components to provide more than one image also includes a plurality of additional light sources to provide bias illumination of the image ...
A surface measurement apparatus of the type in which a sensor is traversed along a path in contact with or adjacent the surface of a component under test. The sensor has three or more transducers which, in the described embodiment, physically contact the surface under test and produce individual sig ...
