Non-lubricated wave gear device
Granted: September 9, 2003
Patent Number:
6615689
A wave gear device does not need to be lubricated. In a cup-shaped wave gear device 1, the inner ring 43 and balls 45 of the wave bearing 42 of the wave generator 4 are made of a ceramic material, while the outer ring 44 of the wave bearing 42 is made of SUJ2 or stainless steel. A DLC coating 302 is formed by a DLC coating process on a rolling surface 48 formed in the inner circumferential surface of the outer ring 44, a DLC coating 303 is formed by a DLC coating process on a rolling…
Optical encoder
Granted: August 26, 2003
Patent Number:
6610975
In an optical linear encoder, light from an LED 2 passes through a moving grating 31 formed in a semiconductor moving plate 3 and is reflected by a reflective grating 41 of a reflective grating plate 4. An image of the reflective grating is detected by photodiodes 32 that are formed in the shape of a grid on the semiconductor moving plate 3. The moving grating 31 and the photodiodes 32 are formed on the same semiconductor substrate with the photodiodes 32 in the form of a grid having a…
Positioning system
Granted: June 24, 2003
Patent Number:
6583738
A positioning system in which a absolute sensor detection signals are communicated to a controller, which is a personal computer, via a PC card. The PC card is provided with sensor connection terminals, a converter for converting sensor detection signals to digital position signals, PC connection terminals, a sensor drive circuit, and a switching circuit. The sensor switching circuit switches sensor connection terminals in accordance with commands from the personal computer, whereby one…
Wave gear drive having a transfer-torque control mechanism
Granted: May 20, 2003
Patent Number:
6564677
A wave gear drive (1) includes an annular rigid internal gear (2), an annular flexible external gear (3) arranged inside of the annular rigid internal gear (2), and a wave generator (4) fitted inside of the annular flexible external gear. The wave generator (4) includes a rigid cam plate (41) having a predetermined outline, and a hub (43) inserted into a fitting hole (42) formed in the center of the rigid cam plate (41). A transfer-torque control mechanism for limiting the torque…
Toroidal core winding method and automatic winding apparatus
Granted: May 6, 2003
Patent Number:
6557793
A toroidal core automatic winding apparatus has a winding ring positioned concentrically around a supply ring. The rings are C-shaped, by virtue of a through-slit on each ring. Wire wound on the supply ring is drawn out towards a toroidal core, via a wire guide on the winding ring. A ring rotation mechanism rotates the supply ring and winding ring in the same direction as that in which the supply ring was rotated when being loaded with the wire, but at mutually different speeds, to wind…
Reference table tilting mechanism
Granted: April 22, 2003
Patent Number:
6550401
A reference table tilting mechanism has a reference table which is supported by a plate spring and is adjusted of its angle of inclination by first and second angle adjusting machines constituted by an eccentric cam mechanism. Angles of inclination of the reference table in first and second directions are detected by first and second inclination angle sensors. Based on the detected angles by these sensors, the respective angle adjusting machines are feed-back controlled to make the angle…
Method of compensating periodic signals in sensor output
Granted: April 1, 2003
Patent Number:
6542842
A method of compensating periodic error signals in sensor output is provided. The method comprises obtaining a sum signal from sensing outputs of M sensor elements (where M is a positive integer), obtaining the amplitude and phase of N frequency components included in the sum signal, and calculating a sensing output gain adjustment coefficient for each sensor output. To ensure that a sum signal level obtained by summing a pre-adjustment output of each sensor element multiplied by the…
Negative deflection flexible meshing type gear device having passing tooth profile with maximized tooth height
Granted: March 4, 2003
Patent Number:
6526849
A flexible meshing type gear device includes a rigid internal gear, a flexible external gear and a wave generator, wherein the flexible external gear includes a cylindrical body and external teeth formed on the outer surface of the cylindrical body. The basic tooth profile of the flexible external gear having a flexing coefficient of smaller than 1 is given the shape of a convex arc, and a normal at the inflection point of the movement locus described by the center of the convex-arc…
Absolute sensor
Granted: February 25, 2003
Patent Number:
6524209
An absolute sensor 1 has a high speed side encoder 13 mounted on a high speed rotational shaft 6, a low speed rotational shaft 11 arranged coaxially with the high speed rotational shaft 6, a planetary gear mechanism 10 for reducing the speed of rotation of the high speed rotational shaft 6 and delivering the rotation of reduced speed to the low speed rotational shaft 11. The planetary gear mechanism 10 has a fixed sun internal gear a, a front stage planetary gear b, a rear stage…
Distributed termination system for two-way hybrid networks
Granted: December 3, 2002
Patent Number:
6490727
In hybrid fiber coaxial cable networks such as used in cable television where two-way digital communications are desired, a distributed termination system is provided. In such a system the home terminals are digital terminals, such as digital set-top boxes or cable modems using bi-directional transmission standards. The functionality of the head end controller in a conventional system is in this system distributed between the head end and the fiber nodes which link the coaxial cable and…
Apparatus and methods of multiplexing data to a communication channel
Granted: December 3, 2002
Patent Number:
6490298
Apparatus and methods for multiplexing data received from a plurality of sources to a communication channel. Each of the sources is assigned to one of at least two scheduling layers based in part upon one or more bit rate characteristics of the sources.
Flexible meshing type gear device having deflection meshing involute tooth profile
Granted: October 22, 2002
Patent Number:
6467375
A flexible meshing type gear device has a rigid internal gear, a flexible external gear disposed inside the internal gear and a wave generator for flexing the external gear into an elliptical shape. One circle of curvature at the point of contact of the involute curve making contact at the meshing center position is made coincident with a tooth profile circle of curvature satisfying the Euler-Savary equation that applies between the tooth profile curvatures at the tooth profile contact…
Multi-function type absolute converter
Granted: October 22, 2002
Patent Number:
6469651
A multi-function type absolute converter comprises a sensor I/O port having a plurality of sensor connection terminals that can be connected to a plurality of absolute sensors, a conversion circuit for converting absolute sensor detection signals input via the sensor connection terminals to digital position signals, a PLD that can perform prescribed processing on the digital position signals thus generated, a host I/O port having output terminals for outputting the digital position…
Digital video compressor with border processor
Granted: October 8, 2002
Patent Number:
6463102
In one embodiment, an edge or border processor modifies the undisplayed edges of an uncompressed video input signal before it is applied to a compression engine. This configuration reduces the number of bits used in the compression process. The undisplayed edges of the video signal are modified either by being turned black, by blurring, or by copying, depending on the application. As an aspect of this embodiment, the edge processing functions are integrated into the compression engine or…
Head rail-mounted actuator for window coverings
Granted: August 13, 2002
Patent Number:
6433498
A mini-blind actuator has a motor and a housing that holds the motor and a dc battery. The rotor of the motor is coupled to the baton of the mini-blind for rotating the baton and thereby opening or closing the slats of the mini-blind. Alternatively, the rotor is coupled to the tilt rod of the blind to rotate the tilt rod and thereby open or close the slats of the mini-blind. A control signal generator generates a control signal for completing the electrical circuit between the battery…
Secure broadband communication
Granted: March 26, 2002
Patent Number:
6363482
A system for secure broadband communication, including: (a) a server device for transmitting data; and (b) a client device including a broadband modem for receiving data, the broadband modem including: (i) a public hardware identification key for being sent to the server device, such that the client device is identified by the public hardware identification key and such that the server device permits transmission to the client device through the broadband modem according to the public…
Skylight assembly with head rail-mounted actuator
Granted: January 15, 2002
Patent Number:
6338377
A skylight assembly with head rail-mounted actuator includes a head rail having a shaft rotatably disposed therein. A battery-powered actuator is also disposed within the head rail and coupled to the shaft. The actuator is remotely operable to cause the shaft to rotate. As the shaft rotates, a collapsible shade connected to the shaft moves between an open configuration, wherein the shade is collapsed to allow sunlight to propagated through the skylight, and a closed configuration,…
Phase regulating apparatus
Granted: November 20, 2001
Patent Number:
6318210
A phase regulating speed reducer(20) in a phase regulating apparatus (100) has first and second cup-shaped wave gear gear drives (30,40). A first wave generator (33) for the first wave gear drive (30) is connected to a phase regulating motor. A first flexible external gear (32) and a second flexible external gear (42) of the second wave gear drive (40) are fixed together by a plurality of fastening bolts (60) so that these external gear are rotated together in a back-to-back state. A…
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…
