| Patent Number |
Title Of Patent |
Date Issued |
| 5208938 |
Centrifugally operated wiper mechanism for cleaning turret mounted lenses |
May 11, 1993 |
| A wiper mechanism (7), especially suitable for cleaning the curved lens (6) of a multirole turret, comprises a wiper (8) which is acted on centrifugally when the mechanism (7) is operated to cause the wiper (8)to be moved from a "parked" position (dashed outline) to an "operating" po |
| 5193103 |
Digital phase locked loop circuit |
March 9, 1993 |
| An all-digital phase locked loop circuit is described in which a numerically controlled oscillator is driven at a multiple of a required output frequency; a counter is provided to divide the output frequency of the oscillator by the multiple; an analogue to digital converter is provi |
| 5192864 |
Two dimensional display produced by one dimensional scanned emitters |
March 9, 1993 |
| An display arrangement 16 comprises a two dimensional imaging array 3. Each column of the image array 3 is read sequentially by an electronic circuit 11. This energizes a one dimensional LED array 12 in dependence upon the received radiation. A motor 9 rotates a mirrored surface of a pol |
| 5185613 |
Hybrid structures |
February 9, 1993 |
| A hybrid structure comprising a lens 10, an antenna array 8 and a semiconductor microcircuit 2. The antenna array 8 is formed on a surface of the lens 10 or on a surface of a substrate 14 having substantially the same refractive index as the material of the lens 10. Metal bump bonds 6, |
| 5181013 |
Display apparatus |
January 19, 1993 |
| A cathode ray tube is used to address a spatial light modulator. The light used to read the spatial light modulator is preferably passed through an acoustic optical tunable filter to enable the wavelength and intensity to be rapidly controlled to provide, for example, a multicolor displa |
| 5180912 |
Display system with means for variably deflecting an array of optical emitters |
January 19, 1993 |
| An imager comprises a lens 31 focusing radiation onto a sensor array 32, and a chopper comprising sectors which refract radiation in different directions such that an image is microscanned upon the sensor array 32. The chopper 4 is driven by motor 34 which also drives a polygon 37. The |
| 5164848 |
Helmet mounted display |
November 17, 1992 |
| A holographic objective system (3) produces an intermediate real image (4) of information displayed on an electrically addressable spatial light modulator or SLM (1), the real image (4) being collimated by a powered holographic reflector (5) constructed as part of the visor of a helmet |
| 5162911 |
Circuit for adding r.f. signals |
November 10, 1992 |
| The circuit is capable of selectively adding r.f. inputs at A, B dependent on the bias voltage applied to varactor diodes D1, D2. In one bias condition of the diodes and hence one value of capacitance, the reactance between A and B and between the output and point D is equal to the r |
| 5136417 |
Optical system |
August 4, 1992 |
| A scanning thermal imager includes means to compensate for a degree of undesirable asymmetry introduced by an element such as a spherical lens operating in an off axis manner. The means can advantageously include an optical element mounted in the optical path with at least one main face |
| 5130814 |
Video recording and reproducing apparatus including dual offset CCD image arrays |
July 14, 1992 |
| A Television camera uses a pair of CCD imaging sensors (CCDA, CCDB), which are offset by half a pixel horizontally and one television line vertically and a beam splitter for focusing radiation from a scene to be imaged onto both imagers simultaneously. The outputs of the two imagers are |
| 5121702 |
Underwater vehicle |
June 16, 1992 |
| A submarine is provided with a large number of individual fins, some of which are arranged to create a "slot" effect between them. The fins are controlled in a way which is dependent on which of them may be in service at a particular time so that manoeuvreability is substantially unaffec |
| 5108027 |
Flip chip solder bond structure for devices with gold based metallization |
April 28, 1992 |
| A flip-chip solder bonding arrangement including a semiconductor substrate having thereon layers of metallization which have a tendency to interact with a solder material, forming on said layers of metallization a barrier metallization layer which is not reactive with said solder materia |
| 5105107 |
High speed CMOS differential interface circuits |
April 14, 1992 |
| High speed CMOS differential input and output interface circuits comprise input and output means arranged to be controlled by biasing means. The biasing means generates a bias voltage. The output interface has a single ended to differential translator as the input means and an differenti |
| 5081693 |
Thermal imager arrangements |
January 14, 1992 |
| Pictorial data from a thermal imager is applied on a line to a RAM at which a histogram representing the numerical distribution of pixel values is produced. This is applied to a microprocessor which uses the histogram to produce a transform to control the gain and offset of the data outp |
| 5076901 |
Method of manufacturing perovskite lead scandium tantalate |
December 31, 1991 |
| A method is described of manufacturing perovskite lead scandium tantalate comprising the pre-reaction of scandium and tantalum oxides at temperatures between 1000.degree. C. and 1400.degree. C. to form scandium tantalate. The scandium tantalate is then reacted with lead oxide to form |
| 5059781 |
Orientation monitoring apparatus |
October 22, 1991 |
| The orientation of a helmet is monitored by illuminating the cockpit volume by a moving interference pattern produced by three beams. The sensors detect the varying phase to produce outputs which are compared to determine the orientation of the helmet. |
| 5037168 |
Optical waveguides |
August 6, 1991 |
| A smoothing layer is provided between the rough etched sides of a channel in a substrate in which an optical waveguiding material is to be produced. Losses are substantially reduced thereby. For a rectangular or rib waveguide, where the sides of the rib are left rough by etching, a s |
| 5029978 |
Optical phase modulator |
July 9, 1991 |
| An optical phase modulator comprises a body 1 of a matrix material which supports a length of optical fiber 2, the said body including a polymer material having piezoelectric properties and being provided with spaced electrode areas 4 such that the application of an electrical potential |
| 5028108 |
Bipolar transistor including optical waveguide |
July 2, 1991 |
| An optical device comprises a heterojunction bipolar transistor which includes a light guiding layer to which the base contact is made. A ridge is included adjacent to the light guiding layer and acts as the emitter or collector of the transistor, the ridge also defining the lateral exte |
| 5027120 |
Delta-sigma converter with bandpass filter for noise reduction in receivers |
June 25, 1991 |
| Analogue signals are converted to digital data by use of a Sigma-Delta modulator including a pair of bandpass filters and a feedback loop including a digital to analogue converter. The tendency of such a circuit to instability is reduced or eliminated by making small variations in the |
| 5022628 |
Mounting for machinery |
June 11, 1991 |
| The engine and other machinery within a marine vessel is mounted on a raft which is relatively flimsy compared with conventional constructions. The raft is supported by electromagnets, the current to which is controlled so as to avoid vibration and flexing which would otherwise take plac |
| 5021791 |
Radar systems |
June 4, 1991 |
| A radar system comprises a radar carrier frequency oscillator for producing a radar carrier signal, a receiver including a mixer for producing Doppler signals, a Doppler filter bank and an alarm circuit, including a series of Doppler bins, having an alarm threshold level. The radar syste |
| 5021657 |
Thermal imager |
June 4, 1991 |
| A thermal imager employs an intermediate field stop (8) which is preferably placed at an intermediate image plane (P) in front of a cryogenically cooled detector (1) mounted on a substrate (2). Radiation gathered by a telescope is directed onto the detector through an aperture (9) in the |
| 5014342 |
Communication system employing a nine channel pattern allocation to eliminate interference |
May 7, 1991 |
| In a communication system having a plurality of base stations for communication with mobile terminals, each station is allocated one of nine communication channels. The allocation is arranged such that adjacent channels are spaced further apart than non-adjacent channels so as to eli |
| 4998226 |
Hydrophone |
March 5, 1991 |
| Inertially insensitive optical fibre hydrophones are described, utilizing materials and configurations to obtain acceleration balanced designs suitable for underwater applications where acceleration is a problem. Balancing and/or insensitivity is obtained both in longitudinal and axi |
| 4993794 |
Integrated optic waveguide with bend |
February 19, 1991 |
| An integrated optic device includes a waveguide which is curved and includes a section at the bend which is capable of supporting more than one waveguide mode at the opearting frequency. This enables bend angles of greater than 5.degree. be to accommodated without excessive power losses. |
| 4958895 |
Optical waveguides |
September 25, 1990 |
| A thin film optical waveguide made of a polymeric waveguiding film supported on a substrate, the film being made of a homopolymer of vinylpyridine or of a derivative or vinylpyridine in which the pyridine heterocyclic nucleus is substituted. Alternatively, a copolymer containing a ma |
| 4956873 |
Image processing apparatus |
September 11, 1990 |
| In order to correct the swathe related banding effect often seen on swathe-scanned imagers a vertical smoothing function separates out artifact detail from the idealized image and derives, from this, proportional corrections for each channel within a swathe. In cases where the artifa |
| 4952809 |
Imaging system |
August 28, 1990 |
| An infra-red imaging system is operable selectively in wide and narrow field of view modes. Radiation from the object is imaged onto an infra-red CCD staring focal plane array (SFPA) which provides an output representing the image. In the narrow field of view mode, operative on detection |
| 4952018 |
Optical in line filters |
August 28, 1990 |
| An optical in-line filter comprises a first waveguide whose output end is coupled to a second, narrower waveguide such that light from the first waveguide of a predetermined waveband or wavebands only is passed to the second waveguide light of other wavebands emerging elsewhere from the |
| 4950056 |
Optical system |
August 21, 1990 |
| Catadioptric optical systems are generally arranged to view a fixed large field of view. Apparatus for steering a field of view includes a pair of Risley prisms, which are disc shaped prisms having a generally shallow wedge like side cross-section, arranged in the path of the incoming |
| 4933555 |
Thermal imager |
June 12, 1990 |
| A thermal imager including a cryogenically cooled detector element array and a scanning element has an optical system with a field of view limited by a field stop (2). A retroreflective region (6) is provided on part of the field stop to act as a temperature reference by allowing the det |
| 4921318 |
Lens systems |
May 1, 1990 |
| A lens system for imaging infra-red radiation comprises two elements, one of Zinc Selenide and the other of either Zinc Sulfide or Cesium Bromide (5). Lens configurations are shown which allow imaging at a common image plane over at least both the 3-5 .mu.m and 8-12 .mu.m optical waveban |
| 4920418 |
Imaging system having a swing-driven image sensor |
April 24, 1990 |
| An imaging system, which improves the optical revolution and reduces optical alias of a solid state imager comprises a lens and a modulating element, which alters incident radiation in such a manner as to displace the image by fractions of a pixel between adjacent fields by either me |
| 4868657 |
System for image production by variable scanning |
September 19, 1989 |
| A video imaging system comprising: a detector with an odd number of elements for the simultaneous scanning of a swath consisting of a corresponding odd number of parallel horizontal image lines; a variable vertical scanning device for causing the detector to scan the image repeatedly |
| 4835606 |
Swathe scanned imager |
May 30, 1989 |
| Scanning imagers often comprise a plurality of detector elements which may be scanned in swathes to produce an image. To match the offsets or sensitivities of such elements the mean values of the channels adjacent each swathe boundary are compared, and an error signal produced which is |
