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| Number | Title | Issue Date |
| 5387973 | Detector apparatus for detecting coherent point-source radiation Detector apparatus includes a diffraction grating (11) having a period such that the incidence of coherent point-source radiation upon it produces a number of spaced self-images of the grating behind it. A Moire grating (12) is placed to coincide with one... | 02/07/1995 |
| 4903276 | Power supply for radio-frequency excited gas laser The power supply includes an oscillator (20) which generates a radio-frequency signal amplified by an amplifier (21). The amplified signal is applied to a laser (22) to initiate and maintain a discharge in the laser gaseous active medium. Power control me... | 02/20/1990 |
| 4779286 | Multiple-fold laser A laser optical cavity extends between two end reflectors (11, 12) and is defined by at least three sections. A number of folding reflectors (14) are provided for directing radiation emerging from one section into the next. An active medium is contained i... | 10/18/1988 |
| 4772798 | Optical scanning apparatus The apparatus comprises a radiation-sensitive detector (17) and optical means for directing radiation from an observed field of view on to the detector. The optical means includes a rotatable support member (10) rotatable about an axis (11) and carrying a... | 09/20/1988 |
| 4768028 | Display control apparatus having a cursor The apparatus includes alignment means (13, 14) for determining the direction of a sight-line (12) extending from an observer (11) to a display surface (10), projection means (15, 16) for projecting an image of a graticule into the sight-line for movement... | 08/30/1988 |
| 4764002 | Balanced optical system An optical element (10) is pivoted for limited rotation about an axis (12). An actuator arm (14) is rotatable by an actuator (13) about an axis (15) and is connected to the optical element by a first link (16). A second link (21) connects the actuator arm... | 08/16/1988 |
| 4760313 | Cathode ray tube display systems A CRT display system providing a raster pattern, possibly for a flat screen CRT, has an oscillator driving a Line counter. The Line counter drives a Field counter and a Line DAC. The Field counter drives a Field DAC. In response, there are generated signa... | 07/26/1988 |
| 4714873 | Microwave noise measuring apparatus Apparatus for measuring the phase noise content of a microwave signal source (10) includes a microwave cavity (22) resonant at a fixed frequency, signal generating means (23) operable to generate a frequency representing the difference between the source ... | 12/22/1987 |
| 4714321 | Optical viewing apparatus The apparatus permits an external target to be viewed along a sight-line by a sensing device and for the projection of a beam of laser radiation (12) towards the target. The apparatus includes a viewing window (10) transparent to radiation at a wavelength... | 12/22/1987 |
| 4702602 | Dither mechanism for ring laser gyroscope A dither mechanism comprises a hub (10) arranged to be fixed to a mounting, and a rim (11) coaxial with the hub and to which the ring laser may be attached. A number of radial spokes (12) interconnect the hub (10) and the rim (11), and each has its point ... | 10/27/1987 |
| 4700456 | Semiconductor device containing bipolar transistor formed by method including three photolithographic steps For a semiconductor device including a bipolar transistor, the emitter, a heavily doped base region surrounding the emitter, and base and collector contact regions, (the collector including a buried layer at an epitaxial layer/substrate interface of the s... | 10/20/1987 |
| 4701745 | Data compression system A data compression system includes an input store (1) for receiving and storing a plurality of bytes of data from an outside source. Data processing means for processing successive bytes of data from the input store includes circuit means (21-25) operable... | 10/20/1987 |
| 4694229 | Servo positioning system A feedback servo positioning system for motor 13 is configured under the control of microprocessor 27 either as a position feedback servo for small displacement demands or an acceleration feedback servo for large displacements. In the latter role, the pro... | 09/15/1987 |
| 4691446 | Three-dimensional position measuring apparatus Apparatus for determining the position of a point movable throughout a measuring volume relative to a set of reference axes includes a probe member (10) having a probe tip (11) defining the position of the movable point. The measuring probe (10) also has ... | 09/08/1987 |
| 4686615 | Power supply circuit A direct-current power supply circuit includes a series-connected switch (TR1) and an inducator (L) connected together with a flywheel diode (D) across an input voltage supply (Vs). A transformer (TX) has a primary winding connected to the indu... | 08/11/1987 |
| 4682086 | Cathode ray tube display systems A CRT display system providing a raster pattern has digital means 30, 31, 32 to drive a DAC 34. In response, there are supplied analogue signals, on a line 37. There are also provided pulse generating means 90 controlled by the digital means, and integrat... | 07/21/1987 |
| 4680012 | Projected imaged weapon training apparatus Apparatus (FIG. 1), for training in the rapid and accurate reaction to a situation confronting one or more trainees 12, 12' in an enclosed room 11, has one wall thereof formed by a screen portion 14 onto which an optical image is back-projected by project... | 07/14/1987 |
| 4680522 | Radiation path axis directing system A radiation path directing system, such as sighting means 10, (FIG. 1) has an imaging detector (not shown) below the apparatus has a field of view centered on a sightline deflected from the vertical axis 22 by mirror 12 rotatable in elevation about axis 1... | 07/14/1987 |
| 4677631 | Gas laser power supply apparatus Power supply apparatus for a gas laser discharge tube (10) having anode and cathode electrodes (11 and 12) comprises a first power supply (13) operable to satisfy the running power requirements of the discharge tube. A second power supply (16) is also pro... | 06/30/1987 |
| 4667296 | Testing the transfer function linearity of analogue input circuits Testing the transfer function linearity of analogue input circuits. The transfer function linearity of an analogue input circuit, such as an analogue-to-digital converter (ADC) 25 is tested by generating two consistently reproducible digital test signals ... | 05/19/1987 |
| 4651951 | Apparatus for the removal of helmet-mounted equipment Apparatus for detaching helmet-mounted equipment (6) from the helmet (4) of a vehicle-mounted user (1) includes a quick-release fastening (8) securing the equipment to the helmet. A removal cord (11) passes from the equipment by way of a guide (10) and is... | 03/24/1987 |
| 4647142 | Method of extending the field of view in a head-up display A method is provided for extending the field of view of a head-up display includes a combiner (31) through which a scene may be viewed by an observer (10), and a display unit (14) having a display surface 13 from which light is directed by a collimating l... | 03/03/1987 |
| 4644302 | Microwave power divider A divider is made from a layer (1) of conducting material carried on an insulating support (2). A first slotline (3) is formed in the conducting layer extending from a first input port (A). A second slotline (5, 6, 7) is formed at right-angles to and spac... | 02/17/1987 |
| 4642542 | Velocity control systems A motor 12 (FIG. 2) is controlled to move at a demanded velocity, input at 29, by sampling the position of the motor at sample intervals, digitally determining the demanded change in position per sample interval, modifying each position sample by the addi... | 02/10/1987 |
| 4641038 | Imaging device A solid state imaging device (FIG. 2) includes an array 10 of photoelectric elements 11 on which an image is formed, and overcomes poor resolution due to insensitive areas 12 between elements by interposing between a focussing lens 13 and the array an opt... | 02/03/1987 |
| 4638454 | Digital data storage apparatus Digital data storage apparatus includes a data store DS having a plurality of multiple-bit word locations, and validity store VS having a lesser plurality of multiple-bit word locations arranged such that each separate bit corresponds to a separate word l... | 01/20/1987 |
| 4636700 | Position servo system A servo system 10 (FIG. 1) for positioning a sighting mirror 11 connected to a pulley 16 comprises a drive motor 13 rigidly connected to a drive pulley 15 in turn coupled by a tensioned drive belt to the pulley 16. Angular position of the motor or pulley ... | 01/13/1987 |
| 4633104 | Bipolar transistor logic circuits A bipolar transistor logic circuit has a hierarchical arrangement of pairs of bipolar transistors, each pair of transistors having their emitters connected together, and the bases of at least some pairs receiving a differential input to the logic circuit.... | 12/30/1986 |
| 4633185 | Chirp signal generator for pulse compression radar A chirp signal generator circuit includes a pulse generator PG for generating a single impulse for application to first surface acoustic wave device SAW. This device produces an output signal comprising several cycles of energy at a predetermined frequenc... | 12/30/1986 |
| 4630111 | Image distortion correction system for electro-optic sensors A system for providing a view of a scene scanned by an electro-optic framing sensor (30) includes control means (36) operable to cause the sensor to scan the scene in a number of frames each of which is viewed at a different viewing angle. Pickoff means (... | 12/16/1986 |
| 4625408 | Measuring apparatus Measuring apparatus for determining the position of a point in a measuring volume relative to a datum point at which three mutually perpendicular axes intersect, includes a probe member supported for movement within that volume. Errors due to rotations ab... | 12/02/1986 |
| 4624527 | Radiation-utilizing measurement system In a radiation-utilizing measurement system including a rotatable reflector, a point source, and a point detector, there being a plane both at right angles to the rotational axis and including the source and the detector, the plane also including the opti... | 11/25/1986 |
| 4619616 | Weapon aim-training apparatus Optical aim-training apparatus 10 (FIG. 1) for a rifle 20, or the like comprises a CRT displaying a target image on a scanned line raster. The rifle is simulated and has photo-detection device 21 contained in a housing 22 located adjacent the barrel 19. T... | 10/28/1986 |
| 4618858 | Information display system having a multiple cell raster scan display An information display system includes a raster-scan display screen DS and an information store IS for storing information to be displayed on the screen. The store has a capacity greater than the maximum amount of information which may be displayed at any... | 10/21/1986 |
| 4617521 | Sample and hold demodulator with feedback for reduced riffle A demodulator circuit comprises an integrator (A1) having its input connected through a first switch (S1) to a summing point (P). A modulated carrier signal to be demodulated is applied to the summing point through an input resistor (R1). A sample-and-hol... | 10/14/1986 |
| 4610758 | Manufacture of printed circuit boards A method of manufacture of a printed circuit board having plated-through holes interconnecting printed conductors formed on each of two external surfaces, includes the step of masking those areas of the external surfaces where solder will subsequently be ... | 09/09/1986 |
| 4601206 | Accelerometer system An inertial platform accelerometer cluster (FIG. 1) comprises a cluster of gyro and accelerometer system triads disposed in a cluster housing 10 to detect motion along and about orthogonal x, y and z axes. The orthogonal accelerometer systems each compris... | 07/22/1986 |
| 4580138 | Measurement-expressing apparatus Measurement-expressing apparatus for monitoring (n) switches, the state of each switch representing the state of a station, has a resistor in parallel with each switch, the (n) resistors having binary related resistances, a constant current is supplied to... | 04/01/1986 |
| 4578603 | Temperature-independent gain control circuit A temperature-independent gain control circuit includes a dual-gate MOSFET having the input signal applied to one gate and a resistance connected to the source. Control means are provided which are responsive to a control voltage to control the voltage be... | 03/25/1986 |
| 4572660 | Photographic film copying apparatus In film copying apparatus (FIG. 3) in which a master film 13 and unexposed copy film 13 are drawn past an exposure gate 12 by a drive sprocket 15, the sprocket teeth 16 have a curved profile which engage with film sprocket holes such that the upper film l... | 02/25/1986 |
