1
Kenneth Foden Russell, Alex Victor Garner: Vacuum stressed polymer film piezoelectric transducer. The Rank Organisation, Brisebois & Kruger, December 20, 1977: US04064375 (49 worldwide citation)

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 ...


2
Willis John Robert, Urquhart Pullen David Ian: Planar voice coil loudspeaker. The Rank Organisation, Brisebois & Kruger, August 13, 1974: US3829623 (37 worldwide citation)

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 ...


3
Graham John Siddall, Michael Antony Player: Surface measurement instruments. The Rank Organisation, Brisebois & Kruger, May 31, 1977: US04026031 (37 worldwide citation)

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 ...


4
John D Millward: Television film scanner. The Rank Organisation, Brisebois & Kruger, May 27, 1980: US04205337 (35 worldwide citation)

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 ...


5
William Gordon Freer, Hugh Andrew Pincherle, William Thomas Moore: Liquid crystal displays. The Rank Organisation, Brisebois & Kruger, September 26, 1978: US04117472 (31 worldwide citation)

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 ...


6
Fawcett John Anthony, Gray William Hugh: Multi-layer anti-reflection coatings using intermediate layers having monotonically graded refractive index. The Rank Organisation, December 19, 1972: US3706485 (31 worldwide citation)

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 ...


7
David J Whitehouse, John Jungles: Measuring instruments. The Rank Organisation, Brisebois & Kruger, August 19, 1980: US04218144 (30 worldwide citation)

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, ...


8
Collinson John Dunn: Electro-acoustic transducers. The Rank Organisation, Brisebois & Kruger, September 3, 1974: US3833771 (24 worldwide citation)

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 ...


9
Cook Gordon Henry, Fawcett John Anthony: Optical beam splitting system. The Rank Organisation, Brisebois & Kruger, September 16, 1975: US3905684 (23 worldwide citation)

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 ...


10
David John Whitehouse: Measuring instrument. The Rank Organisation, Brisebois & Kruger, April 18, 1978: US04084324 (22 worldwide citation)

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 ...