Eye-protection device having dual high voltage switching

Details Eye-protection device having dual high voltage switching Eye-protection device having dual high voltage switching

2005-01-11

2005-01-11

Luu, Thanh X. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C349S014000, C250S201100

Reexamination Certificate

active

06841772

ABSTRACT:
An auto darkening eye protection device comprising a shutter assembly and a control circuit. The shutter assembly is adjustable between a clear state and a dark state. The control circuit comprises a sensing circuit, a weld detect circuit, and a delivery circuit. The sensing circuit senses incident light and provides an output indicative of the incident light. The weld detect circuit receives the output of the sensing circuit, and enables a dark state drive signal to be delivered to the shutter assembly. The delivery circuit outputs the dark state drive signal to the shutter assembly to switch the shutter assembly from the clear state to the dark state upon enablement by the weld detect circuit. The dark state drive signal includes a high voltage pulse followed by a stable AC waveform. The high voltage pulse is formed by a positive voltage signal and a negative voltage signal.

REFERENCES:
patent: 2423320 (1947-07-01), Hurley
patent: 2548230 (1951-04-01), Molyneux
patent: 2761048 (1956-08-01), Herrick et al.
patent: 3137784 (1964-06-01), Kasemann
patent: 3159844 (1964-12-01), Haboush
patent: 3245315 (1966-04-01), Marks et al.
patent: 3575491 (1971-04-01), Heilmeier
patent: 3731986 (1973-05-01), Fergason
patent: 3873804 (1975-03-01), Gordon
patent: 3881808 (1975-05-01), Gurtler et al.
patent: 3881809 (1975-05-01), Fergason et al.
patent: 3890628 (1975-06-01), Gurtler
patent: 3918796 (1975-11-01), Fergason
patent: 3967881 (1976-07-01), Moriyama et al.
patent: 4039803 (1977-08-01), Harsch
patent: 4071912 (1978-02-01), Budmiger
patent: RE29684 (1978-06-01), Gordon
patent: 4155122 (1979-05-01), Budmiger
patent: 4237557 (1980-12-01), Gordon
patent: 4240709 (1980-12-01), Hornell
patent: 4279474 (1981-07-01), Belgorod
patent: 4328490 (1982-05-01), Usuba et al.
patent: 4385806 (1983-05-01), Fergason
patent: 4435047 (1984-03-01), Fergason
patent: 4436376 (1984-03-01), Fergason
patent: 4540243 (1985-09-01), Fergason
patent: 4556289 (1985-12-01), Fergason
patent: 4560239 (1985-12-01), Katz
patent: 4582396 (1986-04-01), Bos et al.
patent: 4664479 (1987-05-01), Hiroshi
patent: RE32521 (1987-10-01), Fergason
patent: 4710694 (1987-12-01), Sutphin et al.
patent: 4728173 (1988-03-01), Toth
patent: 4759608 (1988-07-01), Yang
patent: 4813766 (1989-03-01), Keene et al.
patent: 4821292 (1989-04-01), Childress
patent: 4863244 (1989-09-01), Fuerthbauer et al.
patent: 4877310 (1989-10-01), Seachman et al.
patent: 4901074 (1990-02-01), Sinn et al.
patent: 4928181 (1990-05-01), Harward
patent: 5015086 (1991-05-01), Okaue et al.
patent: 5074647 (1991-12-01), Fergason et al.
patent: 5113270 (1992-05-01), Fergason
patent: 5184156 (1993-02-01), Black et al.
patent: 5208688 (1993-05-01), Fergason et al.
patent: 5248880 (1993-09-01), Fergason
patent: 5252817 (1993-10-01), Fergason et al.
patent: 5347383 (1994-09-01), Fergason
patent: 5377032 (1994-12-01), Fergason et al.
patent: 5420502 (1995-05-01), Schweitzer, Jr.
patent: 5519522 (1996-05-01), Fergason
patent: 5671035 (1997-09-01), Barnes
patent: 5751258 (1998-05-01), Fergason et al.
patent: 6067129 (2000-05-01), Fergason
patent: 6070264 (2000-06-01), Hamilton et al.
patent: 6614409 (2003-09-01), Bae
patent: DT 2315308 (1973-10-01), None
patent: 0157744 (1985-09-01), None
patent: 0335056 (1989-04-01), None
patent: 0349665 (1990-10-01), None
patent: 2530-039 (1984-01-01), None
patent: 325586 (1930-02-01), None
patent: 59-92276 (1980-07-01), None
patent: 59-111102 (1984-06-01), None
patent: SW 73127334 (1977-07-01), None
patent: SW 7608690-9 (1979-02-01), None
patent: WO 9014809 (1990-12-01), None

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