Anti-flicker circuit for automatic turn-on of nightlight
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
May 13, 1986
Grant Date -
N/A
app pub date -
Aug 12, 1983
filing date -
Aug 12, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A second photoelectric element or cell (P2) is mounted in series with a first photoelectric element or cell (P1) of the prior art and in parallel with a portion of a voltage divider of which said first element is a part to shunt out a portion of the divider in response to light from a light load turned on by the operation of said first element incident to an increase in impedance thereof due to ambient darkness. Addition of the second photoelectric cell results in hysteresis of the turn-on/turn-off operating points of the first cell to prevent flicker to the light which is present at or near dusk in lights controlled by the prior art circuits. Mechanically, one cell (P1) is mounted on the side of a collar (21) surrounding the neck of a light bulb (13) outside direct light rays from the filament (23) while cell (P2) is mounted on the collar top in the direct path of light rays from the filament.
First Claim
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International Classification(s)
Cited Art Landscape
Patent Citation Ranking
- 9 Citation Count
- H05B Class
- 0 % this patent is cited more than
- 39 Age