Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2005-01-04
2005-01-04
Le, Que T. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C250S216000
Reexamination Certificate
active
06838661
ABSTRACT:
A torsion oscillator (FIG.1) is stabilized in operation by determining the current resonant frequency (62); in a first procedure, observing the oscillator for change in resonant frequency (64), and then restoring the amplitude and median offset (66) without changing the drive frequency. In an alternative procedure, after determining the resonant frequency (62); setting the drive frequency close to but offset from the current resonant frequency (74), observing the oscillator for change in resonant frequency (76), and the restoring the close offset to the changed resonant frequency (78). By operating slightly off peak, the direction of resonant change is immediately known. The first procedure has less difficulties in implementation, but requires more power.
REFERENCES:
patent: 3803637 (1974-04-01), Martin et al.
patent: 4037231 (1977-07-01), Broyles et al.
patent: 4317611 (1982-03-01), Petersen
patent: 4329637 (1982-05-01), Kotake et al.
patent: 4344677 (1982-08-01), Stuermer et al.
patent: 4630223 (1986-12-01), Schoon
patent: 4762994 (1988-08-01), Byerly et al.
patent: 5157650 (1992-10-01), Ozue et al.
patent: 5543956 (1996-08-01), Nakagawa et al.
patent: 5606447 (1997-02-01), Asada et al.
patent: 5629790 (1997-05-01), Neukermans et al.
patent: 5745294 (1998-04-01), Kudo
patent: 5767666 (1998-06-01), Asada et al.
patent: 5841553 (1998-11-01), Neukermans
patent: 5880765 (1999-03-01), Ueda et al.
patent: 5953103 (1999-09-01), Nakamura
patent: 5959760 (1999-09-01), Yamada et al.
patent: 6069727 (2000-05-01), Cho et al.
patent: 6285383 (2001-09-01), Klement et al.
patent: 6295154 (2001-09-01), Laor et al.
patent: 6411321 (2002-06-01), Tanimoto et al.
patent: WO 8912369 (1989-12-01), None
Texas Instruments Product Review, Multi-Topology Piezoelectric Transformer Controller, Nov. 2001, p. 1-27 and page headed “Important Notice”.
Le Que T.
Lexmark International Inc.
Lexmark International Inc.
LandOfFree
Torsion oscillator stabilization including maintaining the... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Torsion oscillator stabilization including maintaining the..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Torsion oscillator stabilization including maintaining the... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3405455