公开(公告)号：WO1989012238A1

公开(公告)日：1989-12-14

申请号：PCT/US1989000406

申请日：1989-02-03

Applicant: HUGHES AIRCRAFT COMPANY

Inventor： HUGHES AIRCRAFT COMPANY ,  HALL, James, T. ,  SMITH, Ronald, T.

IPC: G02B05/28

CPC classification number: C23C16/52 ,  G02B5/289 ,  Y10S359/90

Abstract: A process for forming a single-notch optical filter having a continually and accurately varying periodic profile. An optical medium is coated on a uniform substrate where the homogeneous optical medium produces a rugate filter, so that the profile of the refractive index follows a sinusoidal pattern and Bragg's law. In a preferred embodiment, as the optical medium is coated on the substrate, the depositing film is monitored by optical techniques, and feedback information is provided to a computer driven by a pre-programmed process control algorithm so that real time control of the manufacturing process may be accomplished.

公开(公告)号：WO1989009953A1

公开(公告)日：1989-10-19

申请号：PCT/US1989001260

申请日：1989-03-27

Applicant: HUGHES AIRCRAFT COMPANY

Inventor： HUGHES AIRCRAFT COMPANY ,  EVANS, Daniel, D., Jr.

IPC: G05B19/39

CPC classification number: G05B19/39

Abstract: A digital robotic axis controller which employs a digital processor (37) to apply the inverse of a plant model transfer function to positional information representative of a target path to generate a feed forward position control signal and to combine an error signal with the positional information to generate a feedback control signal. The feed forward and feedback control signals are combined to produce a total position control signal which is supplied to a digital-to-analog converter (27) and then to a plant comprising an amplifier (29), a motor (34) for establishing the actual position of a robotic member (36), and an encoder (35) for deriving the error signal from the motor position. In application, a number of such plants are controlled to achieve a coordinated multidimensional movement with increased accuracy.

公开(公告)号：WO1989009504A1

公开(公告)日：1989-10-05

申请号：PCT/US1989000536

申请日：1989-02-13

Applicant: HUGHES AIRCRAFT COMPANY

Inventor： HUGHES AIRCRAFT COMPANY ,  LAMM, Albert, J. ,  WANG, John, H.S. ,  STOVALL, H., Dean ,  HUI, Kin-Kwok ,  CHIEN, Kuei-Ru

IPC: H01S03/08

CPC classification number: H01S3/107 ,  H01S3/08 ,  H01S3/08072

Abstract: The laser (10) has a crystal modulator (22) located at one end (16) of the laser gain medium (12) opposite the end (14) to which the total reflector or grating (18) is attached. The outcoupler (28) is spaced a predetermined nonzero distance apart from the edge (30) of the crystal (22). The spacing (d) is selected to overcome and compensate for distortions caused by thermal lensing effects in the crystal (22).

公开(公告)号：WO1989008859A1

公开(公告)日：1989-09-21

申请号：PCT/US1989000423

申请日：1989-02-06

Applicant: HUGHES AIRCRAFT COMPANY

Inventor： HUGHES AIRCRAFT COMPANY ,  AHMED, Nazeer ,  TOMLINSON, Roger, R.

IPC: G02B07/00

CPC classification number: G02B7/008 ,  B23Q1/621 ,  B23Q3/183 ,  G02B7/182 ,  Y10T29/4984 ,  Y10T29/49904

Abstract: A method is disclosed for the strain-free mounting of a component, such as a mirror, in a manner that allows differential thermal expansion or contraction to take place without distortion of the component. The mounting method makes use of a linear bearing that is rigid in all directions except one. Such a linear bearing is used at two or more points of support on the circumference of a mounting circle or circles. Relative motion in the linear bearings occurs along a line which is an extension of a radius of the mounting circle. The linear bearings each contain two sets of opposed rolamite mechanisms moving in parallel directions in the perpendicular arms of a "Y"-shaped frame. One of the two cylinders in each of the four rolamite clusters in annular and accepts a roller-bearing mounted shaft, and the four shafts are then rigidly attached to a second frame that rides within the first frame; the rolamite bearing motion occurring between the "Y"-shaped first frame and the second frame, the component being mounted on either frame.

公开(公告)号：WO1989008349A1

公开(公告)日：1989-09-08

申请号：PCT/US1989000660

申请日：1989-02-17

Applicant: HUGHES AIRCRAFT COMPANY

Inventor： HUGHES AIRCRAFT COMPANY ,  ESTES, Earl, M., Jr.

IPC: H02M07/538

CPC classification number: H02P8/12 ,  H02M3/3376 ,  H02M7/538 ,  H02P7/04 ,  Y10T307/615 ,  Y10T307/625 ,  Y10T307/826

Abstract: Two-state, bilateral, single-pole, double-throw, half-bridge power-switching apparatus capable of high speed, high current switching over a duty factor range of 0 % to 100 % includes a single-wire connector (104) to a source (101) of switching signals, a first FET (109) whose gate is connected to the single-wire connector, and a second FET (133) having its gate connected to the drain of the first FET (109) and its source connected to the drain of the first FET (109) through device (138) for preventing, in part, cross-current from the first FET to the second FET to be raised sufficiently high to turn on the second FET. The apparatus also includes a system for delivering on/off signals to the second FET and for holding the second FET on or off in response to switching signals having a duty factor in the range of 0 % to 100 %.

公开(公告)号：WO1989006893A1

公开(公告)日：1989-07-27

申请号：PCT/US1988004601

申请日：1988-12-23

Applicant: HUGHES AIRCRAFT COMPANY

Inventor： HUGHES AIRCRAFT COMPANY ,  TANGONAN, Gregory ,  JONES, Vincent, L. ,  FORREST, Stephen, R.

IPC: H04Q03/52

CPC classification number: H04L49/00

Abstract: An optoelectronic crossbar switch (50) for selectively connecting signals on a plurality of optical fiber channels (52) to a given number of output receivers (78a-h). Each optical fiber channel is split into a different number of optical fibers (56a-h) which are arranged into an array having a plurality of rows and columns.. Each row contains a fiber from each channel. A current summation network (58) is provided for each row and advantageously employs a plurality of selectively activatable detectors (60-74). The detectors are held in their open circuit state via a CMOS multiplexer (80) so as to minimize crosstalk between addressed and nonaddressed detectors. The switch (50) construction also minimizes the number of required components.

公开(公告)号：WO1989006891A1

公开(公告)日：1989-07-27

申请号：PCT/US1988004388

申请日：1988-12-12

Applicant: HUGHES AIRCRAFT COMPANY

Inventor： HUGHES AIRCRAFT COMPANY ,  ZWIRN, Robert ,  THOMAS, Michael

IPC: H04N05/232

CPC classification number: G02B7/365 ,  H04N5/23212

Abstract: A demand auto focus system is driven by scene information only. In a scanned video system as the camera is brought into focus the high frequency content of the video signal will increase. The video signal is passed through a band-pass filter and then rectified in a conditional integrator to generate a control signal whose amplitude indicates to the degree of focus. The control signal is stored and later compared to a control signal derived from a subsequent scanning. Once a significant change in control signal levels is detected a drive signal is sent to the focusing device. If after being driven the subsequent scene has less high frequency content, then a drive signal in the opposite polarity or direction is sent to the focusing device. In this manner the scene is toggled toward optimum focus. When rapid toggling occurs a number of times (three for example), control logic detects this condition which is symptomatic of hunting around optimum focus, and the bidirectional focusing mechanism drive is turned off until such time as the scene becomes so defocused as to reinitiate the focusing sequence.

公开(公告)号：WO1989006081A1

公开(公告)日：1989-06-29

申请号：PCT/US1988004145

申请日：1988-11-21

Applicant: HUGHES AIRCRAFT COMPANY

Inventor： HUGHES AIRCRAFT COMPANY ,  WELKOWSKY, Murray, S.

IPC: H04N05/33

公开(公告)号：WO1989004984A1

公开(公告)日：1989-06-01

申请号：PCT/US1988004134

申请日：1988-11-21

Applicant: HUGHES AIRCRAFT COMPANY

Inventor： HUGHES AIRCRAFT COMPANY ,  MOULIN, Norbert, L.

IPC: G02B06/36

CPC classification number: H01R13/631 ,  G02B6/3843

Abstract: A precision guide assembly (11) comprising a receptacle (13) having an at least part-cylindrical passage (19) with an axis (27), a guide pin (15) sized to be inserted into the passage (19) of the receptacle (13) and having an axis (31). The guide pin (15) has a part-spherical head (33) and an at least part-cylindrical stem (35) joined to the head by a neck (37). The stem (35) and head (33) have substantially the same diameter and a lesser diameter than the diameter of the passage (19) so that the guide pin (15) can be slid into the passage (19). The neck (37) has a cross-sectional dimension less than the diameter of the stem (35) and an inclined surface (39) which is inclined with respect to the axis (31) of the guide pin (15) so that the inclined surface (39) extends radially inwardly as it extends distally.

公开(公告)号：WO1989004233A1

公开(公告)日：1989-05-18

申请号：PCT/US1988003309

申请日：1988-09-26

Applicant: HUGHES AIRCRAFT COMPANY

Inventor： HUGHES AIRCRAFT COMPANY ,  TRUJILLO, Manuel, A.

IPC: B23H09/00

CPC classification number: H01J23/26 ,  H01J23/165 ,  Y10T29/49016

Abstract: A tubular blank (34) from which a slow-wave structure is to be formed is mounted on a mandrel (30) in front of and spaced slightly from an electrode (36) having a predetermined pattern of slots corresponding to areas along the tubular blank (34) from which material is not to be removed. The blank (34) and the electrode (36) are connected to an electrical discharge machine to establish an electrical discharge between the blank (34) and the electrode (36), and the mandrel (30) and the blank (34) carried thereby are simultaneously advanced and rotated past the electrode (36). Portions of the blank (34) adjacent to the non-slotted surface portions of the electrode (36) are removed, while the portions of the blank (34) adjacent to the slots in the electrode (36) are retained.