Lamp stand with multi-stage light modulation

Details Lamp stand with multi-stage light modulation Lamp stand with multi-stage light modulation

2001-11-14

2002-12-17

Phan, Tho (Department: 2872)

Electric lamp and discharge devices: systems

Condenser in the supply circuit

Resistance in the condenser circuit

C315SDIG004, C315S219000, C315S244000, C315S291000, C315S307000

Reexamination Certificate

active

06495970

ABSTRACT:

BACKGROUND OF THE INVENTION
This invention relates to a lamp stand with multi-stage light modulation, particularly to one having a function of stabilizing multi-stage light modulation and needless to use a specially-made lamp but a common incandescent one for light modulating.
A conventional lamp stand with multi-stage light modulation is provided with a specially made lamp and other circuits, lacking practicability and increasing producing cost.
SUMMARY OF THE INVENTION
The objective of the invention is to offer a lamp stand with multi-stage light modulation provided with only a common incandescent lamp for light modulation, needless to use a specially made lamp and having stability in controlling light modulation.


REFERENCES:
patent: 4288725 (1981-09-01), Morton
patent: 4647820 (1987-03-01), Chermin et al.
patent: 4961029 (1990-10-01), Shimizu et al.
patent: 5343125 (1994-08-01), Bernitz et al.
patent: 5500575 (1996-03-01), Ionescu
patent: 5668444 (1997-09-01), Pacholok
patent: 5949197 (1999-09-01), Kastner

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