Piezo-electric drive arrangement for a harmonic drive transmission
Granted: November 13, 2001
Patent Number:
6314835
An apparatus and a method of rotatively empowering a harmonic drive transmission. The steps of the method include arranging a primary and a secondary cup-shaped flexspline co-axially within a rotatable rigid circular spline, and forming pivotable fingers in the secondary flexspline, biasing radially outwardly the pivotable fingers so as to contact and bias radially outwardly the primary flexspline in a sequential manner. The array of teeth between the primary flexspline and the circular…
Video transcoder with bitstream look ahead for rate control and statistical multiplexing
Granted: October 30, 2001
Patent Number:
6310915
A method is provided for transcoding, i.e., decoding, and re-encoding, a previously encoded video signal, to a second encoded representation. A number k>1 of previously encoded pictures of the previously encoded video signal are received in a buffer. Each of the k previously encoded pictures in the buffer is scanned to gather information on each of the k previously encoded pictures. An encoding parameter is allocated to a first one of the k previously encoded pictures which precedes…
Method and apparatus for eliminating noise in analog fiber links
Granted: October 16, 2001
Patent Number:
6304369
An optical transmission system that includes an optical amplifier coupled to the input of an optical modulator having at least two complementary output ports for providing complementary modulated optical output signals can be used such that the relative intensity noise (RIN) associated with the optical amplifier is coupled into the modulated optical output signals as common mode noise and can therefore be eliminated using a differential detection scheme. Removing the RIN associated with…
Small backlash planetary gear assembly
Granted: September 18, 2001
Patent Number:
6290625
A small backlash planetary gear assembly can achieve a large torque capacity while minimizing backlash. The small backlash planetary gear assembly has an assembly housing, an internal gear, a sun gear arranged inside of the internal gear in concentric fashion, a plurality of planet gears meshing with the internal gear and the sun gear, and a carrier rotatably supporting the planet gears. The internal gear includes an annular boss fixed to said assembly housing, a thin wall annular body…
Apparatus and method for broadband feedforward predistortion
Granted: September 4, 2001
Patent Number:
6285252
An amplifying circuit and associated method that outputs a distortion-free signal. The circuit includes an output amplifier driven by two intermediate amplifiers having differing gain factors. The intermediate amplifiers are coupled via an attenuator, a phase shifter, a signal splitter, and signal combiner and produces a predistortion signal that cancels the distortion signal generated from the output amplifier. Another similar amplifying circuit includes an additional combiner and…
Silk hat flexible engagement gear device
Granted: June 26, 2001
Patent Number:
6250179
A silk hat flexible engagement gear device (1) has first and second end plates (2, 3) and an input shaft (4) is rotatably supported, with their ends supported, between the tow end plates. An annular body (61) of a silk hat flexible external gear (6) is disposed on the outer circumference of the input shaft (4). A cross roller bearing (8) and a rigid internal gear (5) which also function as a device housing are arranged on the outer circumference. An cylindrical boss (64) of the flexible…
Gear for wave gear drive
Granted: April 24, 2001
Patent Number:
D440993
Silk hat flexible engagement gear device
Granted: March 20, 2001
Patent Number:
6202508
A flexible engagement gear device (11) has a silk-hat shaped flexible external gear (13) which has a body part (22), a diaphragm (23) and a boss (25). The diaphragm (23) has a plate-shaped part (28), a sectional shape of which, when cut along a plane including a device axial line (11a), is defined at one side by a straight line (232) extending in a radial direction, and at the other side by a first convex circular arc (240), a concave circular arc (250) and a second convex circular arc…
Roll up shade doubled fabric having patterns thereon
Granted: February 20, 2001
Patent Number:
6189592
A roll-up shade is doubled and its ends suspended from a head rail that is mounted above a window. One end is attached to a roller tube and the other end is attached to a stationary tube, with a bight being formed between the tubes. A first sheet is defined from the bight to the roller tube and a second sheet is defined from the bight to the stationary tube. A weighty rod is positioned in the bight to cause the bight to sag away from the head rail, and a shade guide surrounds the rod to…
Cup-type wave gear device
Granted: February 6, 2001
Patent Number:
6182532
A cup-type wave gear device 1 comprises a cup-shaped flexible external gear 4 which has a boss 43 formed at its outer circumferential surface with an external thread 43b. An output shaft 6 is formed on Its end surface with an annular recess whose inner circumferential surface is formed with an internal thread 61. The external thread 43b of the boss 43 is screwed into the internal thread 61 of the output shaft 6. Further, driving pins 8 are used to fasten the boss 43 to the output shaft…
Torque detection mechanism for a flexed meshing type gear drive
Granted: January 9, 2001
Patent Number:
6170340
A cup-shaped flexible external gear 3 of a flexed meshing type gear drive 1 is flexed into an elliptical shape by a wave generator 4. A first torque detection device 6 is disposed on a portion of the external gear 3, for example, on a diaphragm 33 thereof which has a pair of torque detection elements arranged at an angular interval of 90° around a center axis 1a. Likewise, a second torque detection device 7 is also disposed, which has a pair of torque detection elements arranged at…
Flexible meshing type gearing having three-dimensional, non-interactive wide-area intermeshing tooth profile
Granted: January 2, 2001
Patent Number:
6167783
The meshing of the rigid internal gear and the cup-shaped flexible external gear of a flexible meshing type gear device is simulated with racks, similarity transformation is effected on the composite curve consisting of the envelope obtained by axially projecting the movement loci of the rack teeth relative to each other from the tooth trace opening portion to the tooth trace inner extremity in sections perpendicular to the axis and the movement locus in the vicinity of the tooth trace…
Recording and playback of audio-video transport streams
Granted: January 2, 2001
Patent Number:
6169843
A method and apparatus for recording and playback of transport stream packets including multiplexed audio, video and other data streams. The transport streams may be generated in accordance with an MPEG-2 standard. In a record mode, an arrival timestamp is generated for each input transport packet to be recorded in a peripheral storage device. A given arrival timestamp indicates the arrival time of the corresponding transport packet in the recording system. Each of the transport packets…
Planetary gear device
Granted: October 10, 2000
Patent Number:
6129648
A planetary gear device (20) comprises a front-stage side planetary gear mechanism (21) and a rear-stage side planetary gear mechanism (23). The rear-stage side planetary gear mechanism (23) comprises an internal gear (25), a carrier (29) rotatably supported by a pair of main guide bearings (26,27) disposed on both sides of the internal gear (25), a plurality of planetary gears (31) rotatably supported on a plurality of planetary shafts (30) extending between a pair of carrier parts…
Gear for wave gear drive
Granted: September 26, 2000
Patent Number:
D431255
Rotation transmitting device
Granted: September 19, 2000
Patent Number:
6119553
A rotation transmitting device 1 introduces rotation into a vacuum side space 200 via a flexible meshing type gear drive 4 from an atmosphere side space 100. A first spacer 15 is disposed between ball bearings 13 and 14 of a rotation output shaft 5 positioned at the vacuum side, and a magnetic circuit is formed passing from the spacer 15 and through the ball bearing 13, a shaft portion 51 of the rotation output shaft 5 and the ball bearing 14. A magnetic fluid is filled as lubricant for…
AC power passing RF choke with a 15 gauge wire
Granted: September 19, 2000
Patent Number:
6121857
An RF choke for separating or joining an RF signal and an AC power signal on e.g. a CATV transmission line has a large current carrying capacity. The RF choke uses 14 to 16 gauge magnetic wire in order to carry currents as high as 15 amps. In addition, the RF choke has excellent performance as measured by RF frequency response and hum modulation.
Automatic compensation of CNR and OMI in a laser transmitter
Granted: September 19, 2000
Patent Number:
6122302
A laser transmitter used in an optical communication system provides automatic compensation/stabilization of CNR (carrier to noise ratio) and OMI (optical modulation index) in conditions that would have caused these parameters to change if the compensation circuitry was not employed. The compensation circuitry is an open loop that operates in conjunction with a conventional APC (automatic power control) loop. When certain parameters change (i.e., temperature, laser aging, intentional…
Planetary gear device having a backlash adjusting mechanism
Granted: August 8, 2000
Patent Number:
6099432
A planetary gear device 1 comprises a rear-stage planetary gear mechanism 30 having carrier parts 38, 39 constituting a divided-type carrier, wherein axial holes 81-84 of planetary shafts 71-74 fixed on the carriers 38, 39 can be accessed directly from the side of an outer end surface 39c of the output-side carrier part 39, and the both carrier parts 38, 39 can be twisted by gripping these carrier parts by making use of the axial holes, whereby backlash adjustment can be carried out from…
Rigid internal gear of a wave gear drive
Granted: July 4, 2000
Patent Number:
6082222
A rigid internal gear of a wave gear drive is comprise by a tooth-formed member having inner teeth and a circular gear body member, these two members being integrally connected with each other. The tooth-formed member is made of ferrous or copper material having a high strength and wear resistance, while the gear body member is made of lightweight material such as aluminum alloy and the like. These members are connected integrally with each other in a manner that one of these members is…
