Communications: electrical – Continuously variable indicating – With particular transmitter
Patent
1994-09-23
1996-07-09
Swarthout, Brent A.
Communications: electrical
Continuously variable indicating
With particular transmitter
324660, 324662, G08C 1910
Patent
active
055348599
ABSTRACT:
The capacitance sensor (1) comprises a linear or curvilinear array of electrodes (10) connected to means generating on these electrodes (10) a spatially periodic electric potential pattern shifting by increments along said array. Electrodes (10) are disconnected in turn to act as momentarily receiving electrodes (10R), also according to a spatially periodic pattern, shifting by the same increments. Both patterns shift alternately, i.e. the shifts of one pattern taking place between the shifts of the other. A linear or curvilinear scale (2), with a periodic pattern of electrodes (20) or dielectric or conducting relief, facing the sensor, will thus create a periodic fluctuation of the signal coupled on the momentarily receiving electrodes. The relative position between scale (2) and sensor (1) may then be accurately determined by evaluating the phase, after demodulation, of said signal. As the sensor may be integrated on a semiconductor die and the scale may be very narrow, extreme miniaturization and low cost is given. (FIGS. 1a and 1b)
REFERENCES:
patent: Re34741 (1994-09-01), Andermo
patent: 1674729 (1928-06-01), Ledwinka
patent: 2674729 (1954-04-01), Carter
patent: 3342935 (1967-09-01), Leifer et al.
patent: 3857092 (1974-12-01), Meyer
patent: 4477810 (1984-10-01), Tanaka et al.
patent: 4543526 (1985-09-01), Burckhardt et al.
patent: 4733235 (1988-03-01), Baer et al.
patent: 4810951 (1989-03-01), Meyer
patent: 4841225 (1989-06-01), Meyer
patent: 4878013 (1989-10-01), Andermo
patent: 4879508 (1989-11-01), Andermo
patent: 4879552 (1989-11-01), Arai et al.
patent: 4882539 (1989-11-01), Meyer
patent: 4893071 (1990-01-01), Miller
patent: 4959615 (1990-09-01), Andermo
patent: 5049824 (1991-09-01), Suzuki et al.
patent: 5053715 (1991-10-01), Andermo
patent: 5068653 (1991-11-01), Klinger et al.
patent: 5172039 (1992-12-01), Owens
patent: 5237284 (1993-08-01), Van Der Valk
patent: 5239307 (1993-08-01), Andermo
patent: 5293131 (1994-03-01), Semones et al.
patent: 5304937 (1994-04-01), Meyer
patent: 5394096 (1995-02-01), Meyer
patent: 5451940 (1995-09-01), Schneider et al.
patent: 5461320 (1995-10-01), Strack et al.
Edwards, Jr. Timothy
Swarthout Brent A.
LandOfFree
Instrument for measuring lengths or angles does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Instrument for measuring lengths or angles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Instrument for measuring lengths or angles will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1870150