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| Number | Title | Issue Date |
| 4933804 | Interference suppression for semi-conducting switching devices An electrical unit such as a lighting dimmer pack incorporating one or more semi-conducting switching devices such as triacs or thyristors, wherein the usual insulated mounting base (18) of the triac (30) is in turn mounted on the unit casing via an elect... | 06/12/1990 |
| 4498043 | Probes for measuring apparatus A contact sensitive probe, especially for coordinate measuring apparatus, comprising a housing having seatings defining a stable rest position for a stylus member projecting from the housing to terminate at a sensing tip, together with a spring for urging... | 02/05/1985 |
| 4437169 | Stage lighting control system A stage lighting control system having a main processor unit and a portable desk controller, wherein a local microprocessor is provided in the portable desk controller to scan the dimmer control contacts in the desk and to transmit changed state control d... | 03/13/1984 |
| 4342091 | Method of determining the coordinates of the center of curvature of the curved surface of a workpiece A method of determining the coordinates of the center of curvature of the curved surface of a workpiece with respect to a predetermined frame of reference the origin of which coincides with the center of relative rotation between the workpiece and a senso... | 07/27/1982 |
| 4334282 | Testing apparatus A method of deriving the value of any one of the commonly used parameters for characterizing surfaces in surface measurement technology includes the steps of computing the autocorrelation function of a signal representing the surface, and selectively util... | 06/08/1982 |
| 4315284 | Thermal scanning devices An optical scanning device is provided of the kind having optical elements which are rotated and/or oscillated to scan incident light across a detector array. By arranging for successive scans of a plurality of rows of detector elements to overlap, each l... | 02/09/1982 |
| 4279685 | Apparatus for use in film splicing Apparatus for use in film splicing comprising a carriage (11) supporting a first film strip (16A) and a first film scraper (18), means (13) whereby the carriage is laterally movable transverse to the length of the first film strip, a laterally fixed secon... | 07/21/1981 |
| 4268865 | Continuous motion flying spot telecine This invention concerns a continuous motion flying spot telecine apparatus of the kind comprising a cathode ray tube for effecting flying spot line-by-line scanning of each frame of a film during its motion through a scanning station, opto-electronic conv... | 05/19/1981 |
| 4266246 | Continuous motion telecine apparatus and method The invention concerns a method of deriving a television signal representing picture information on a cinema film, and a telecine apparatus according to such method. A disadvantage of continuous motion telecine equipment of the kind using a single linear ... | 05/05/1981 |
| 4247207 | Matrix printer An electrostatic matrix printer has a movable print head (1) in which a row of selectively energizable needles (2) is fixed for printing dots on a surface to be printed by selective energization of the needles in response to binary coded electrical signal... | 01/27/1981 |
| 4234240 | Optical scanning system with unwanted reflections controlled This relates generally to optical systems, and one application of the invention is for reducing deleterious effects produced by surface reflections on lenses in thermal imaging systems.... | 11/18/1980 |
| 4227207 | CRT film scanner with compensation for local brightness variations of scanning beam Apparatus for generating color television signals from photographic film by means of a flying spot scanner incorporating a cathode ray tube is provided with a circuit for compensating for differential variations across the color spectrum introduced by var... | 10/07/1980 |
| 4225251 | Electro-mechanical printing apparatus A portable electro-mechanical printer has a platen (1) over which electro-sensitive paper is advanced, relative to a print head (6) having a few row of selectively energizable needles (8) which is movable by an electric motor transmission (18,19,21,24) pa... | 09/30/1980 |
| 4218144 | Measuring instruments 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 p... | 08/19/1980 |
| 4212845 | Analytical apparatus Apparatus for separating a stream of flowing liquid in a conduit into segments separated by gas bubbles of a known or at least controllable size includes a chamber communicating with the interior of the conduit and a duct of smaller cross section than the... | 07/15/1980 |
| 4205337 | Television film scanner 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 ... | 05/27/1980 |
| 4202597 | Optical scanning system with compensation for unwanted image rotation during scanning In optical scanning systems loss in spatial resolution can result in coupling systems incorporating off axis concave mirrors by virtue of image rotation. In such systems compensation can be introduced for this image rotation by inclining the axis of oscil... | 05/13/1980 |
| 4191972 | Flying spot single field scan telecine apparatus In order to avoid the registration problems involved in multiple scanning of each film frame in a continuous motion flying spot telecine, the video information derived from one field scan only of each frame is used to build up the complete television sign... | 03/04/1980 |
| 4184177 | Television apparatus for consecutive frame scanning of continuous motion film The invention concerns a flying spot telecine apparatus wherein the film is driven at constant speed with a film frame rate which is not exactly half the television field frequency, for example at 24 frames per second where the field frequency is 60 field... | 01/15/1980 |
| 4164761 | Telecine apparatus having improved reproduction during panning and tilting scenes This invention relates to a method and apparatus for improving the reproduction of a television picture derived from a cinema film by a telecine apparatus during a period of panning and/or tilting in the scene recorded on the cinema film. The improvement ... | 08/14/1979 |
| 4127869 | Television apparatus In a flying spot telecine apparatus, the horizontal scanning frequency is increased above the standard frequency to permit sequential scanning. The resultant signal is then processed electronically to provide signals suitable for a normal interlaced pictu... | 11/28/1978 |
| 4117472 | Liquid crystal displays 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 ... | 09/26/1978 |
| 4106845 | Infra-red scanner In a high speed optical scanning system using mechanical scanning by a rotating polygon, an afocal telescope system images radiation on to the rotating polygon which effects line scanning. Frame scanning is effected by an angularly reciprocating mirror.... | 08/15/1978 |
| 4107517 | Opto-electric device Apparatus for transmitting an information signal from one to the other of two relatively rotatable members comprises one or a plurality of light sources radiating into a light guide having an output face which extends over a substantial arc of a circle ar... | 08/15/1978 |
| 4088399 | Audio visual apparatus In a dual film-gauge telecine apparatus two optical sound heads are provided in close proximity to the drive capstan. The drive capstan is provided with an annular groove to support one of the optical sound heads. The sound heads comprise a light source a... | 05/09/1978 |
| 4084324 | Measuring instrument 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 ... | 04/18/1978 |
| 4080741 | Measuring apparatus With stylus type measuring instruments for the measurement of surface roughness or form an improved method of setting up employs a reference body having a cylindrical or part-cylindrical surface. By probing the curved reference surface a datum point is es... | 03/28/1978 |
| 4077048 | Optical diffractometers An optical diffractometer is disclosed in which there is provided a television camera system for displaying light patterns derived from the image plane or the transform plane of the diffractometer. The camera system includes a modulating network for provi... | 02/28/1978 |
| 4070762 | Measuring apparatus A roundness measuring instrument of the type having a workpiece table and a pick-up carried on a pick-up mount which is radially adjustable to move the pick-up radially with respect to a fixed axis about which the table is rotatable, in which there is pro... | 01/31/1978 |
| 4064375 | Vacuum stressed polymer film piezoelectric transducer 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 plan... | 12/20/1977 |
| 4060307 | Face plate graticule In an optical display system, information recorded on a face plate or like optical element is injected into a main optical path by means of a standby sight device comprising a lens unit and a flexible fibre optic bundle having a numerical aperture suffici... | 11/29/1977 |
| 4056881 | Method of manufacturing electro-optical cell A method of manufacturing an electro-optical cell in which at least one insulating lamina of adhesive material bonded to at least one spacer element and having an opening defining the limits of the cell is introduced between two cell walls, and the walls ... | 11/08/1977 |
| 4054912 | Film scanner with compensation for film shrinkage The invention is concerned with a means of compensating for film shrinkage in a continuous film motion telecine apparatus. A measure of the film shrinkage is obtained by deriving a signal representing the angular speed of a roller in non-slipping contact ... | 10/18/1977 |
| 4034165 | Transducer with rearwardly disposed damping elements A loudspeaker of the well known conical diaphragm moving coil type is provided with an annular, frusto-conical, cellular damping/deflection element on the magnet or magnet housing thereof. This element interferes with the rearward radiation of sound from ... | 07/05/1977 |
| 4026031 | Surface measurement instruments 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 o... | 05/31/1977 |
| 4020299 | Electro-acoustic transducer diaphragms An electro-acoustic transducer having a sound-generating diaphragm and means for driving the diaphragm in which the diaphragm is provided with perforations filled with damping material to oppose the formation of standing waves in the diaphragm. The perfor... | 04/26/1977 |
| 4015235 | Aircraft parking guidance indicator An optical system for guiding the pilot of a ground-maneuvering aircraft towards a parking bay has, an illuminated target positioned behind a fixed stop aperture along a line of sight of the pilot which is inclined to the direction of approach of the airc... | 03/29/1977 |
| 3992078 | Lens structure An optical objective for the infra-red wave band, comprising front and rear simple positive lens elements each made of Germanium, said elements being axially spaced by a distance S lying between 0.8F and 1.2F, the rear surfaces of said elements being plan... | 11/16/1976 |
| 3989493 | Methods for making a fiber optic display device A display device is formed from a fiber optic bundle by stripping a portion of the sheath from the bundle and thereafter twisting the exposed fibers together, heating the fibers to form a permanent bend therein and then applying a shock to the fibers to u... | 11/02/1976 |
| 3979743 | Displays A liquid crystal analogue display device has a pair of electrodes between which a nematic liquid crystal material is disposed, so that the liquid crystal is switched from a homogeneous to a homeotropic state when the voltage between the electrodes exceeds... | 09/07/1976 |
