Electric lamp and discharge devices: systems – Plural load device systems – Electric switch in the supply circuit
Reexamination Certificate
1999-09-30
2001-06-19
Wong, Don (Department: 2821)
Electric lamp and discharge devices: systems
Plural load device systems
Electric switch in the supply circuit
C315S292000, C315S312000, C362S085000, C362S233000, C362S284000, C362S285000
Reexamination Certificate
active
06249092
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a lighting apparatus and more particularly to a profile spotlight or similar lighting apparatus capable of controllably dimming a lighting unit using a discharge lamp.
2. Description of the Background Art
A theater, hall, window display or similar cite is, in many cases, lighted by lighting units using halogen lamps. Metal halide lamps have a higher emission efficiency than halogen lamps and can emit a great quantity of light with small power while radiating a minimum of heat. However, metal halide lamps, which are discharge lamps, are difficult to electrically dim and are not suitable for profile spotlights required to dim a plurality of lighting units in various ways at the same time.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a lighting apparatus capable of dimming a plurality of lighting units using discharge lamps in various ways.
In accordance with the present invention, a lighting apparatus includes a housing accommodating a removable discharge lamp. A shutter mechanism is positioned on the optical path of the discharge lamp in front of the lamp for p physically or mechanically opening or closing the optical path to thereby dim light issuing from the lamp. A lens converges the light passed through the shutter mechanism. A casing accommodates the housing, shutter mechanism and lens. A power supply section feeds electric power to the discharge lamp. A controller is operative in response to a control signal to control the power supply section for setting up or interrupting electric power feed from the power supply section to the discharge lamp, and control the shutter mechanism for dimming the light.
Also, in accordance with the present invention, a lighting apparatus includes a housing accommodating a removable discharge lamp. A first shutter mechanism is positioned on the optical path of the discharge lamp in front of the lamp for physically or mechanically opening or closing the optical path to thereby dim light issuing from the lamp. A lens converges the light passed through the first shutter mechanism. A second shutter mechanism is positioned on the optical path for physically or mechanically opening or closing an optical path on which the light converged by the lens is propagated to thereby dim the light. A casing accommodates the housing, first shutter mechanism, second shutter mechanism and lens. A power supply section feeds electric power to the discharge lamp. A controller is operative in response to a control signal to control the power supply section for setting up or interrupting electric power feed from the power supply section to the discharge lamp, and control at least one the first and second shutter mechanisms to thereby dim the light.
REFERENCES:
patent: 4392187 (1983-07-01), Bornhorst
patent: 5502627 (1996-03-01), Hunt et al.
patent: 5758955 (1998-06-01), Belliveau
patent: 4-3092 (1929-06-01), None
patent: 5542207 (1953-09-01), None
Birch & Stewart Kolasch & Birch, LLP
Coburn Japan Corporation
Lee Wilson
Wong Don
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