초록 ▼

An electronic lighting device for simulating a flame, particularly a candle flame. In the preferred embodiment a set of three vertically spaced lamps are enclosed in a translucent bulb and are controlled by a signal generator circuit which independently turns three lamps on and off in a manner which

An electronic lighting device for simulating a flame, particularly a candle flame. In the preferred embodiment a set of three vertically spaced lamps are enclosed in a translucent bulb and are controlled by a signal generator circuit which independently turns three lamps on and off in a manner which simulates both the illumination distribution and the gas turbulence in a natural flame. The circuit includes a multistage static shift register which is used in a feedback mode to produce three mutually delayed pseudo-random pulse trains. One pulse train is used directly to control the uppermost lamp. The other pulse trains are combined with assymetric long-duty-cycle and short-duty-cycle clock signals. The resulting combined signals are used to drive the lower and middle lamps, respectively. The net result is that the lowermost lamp is brightest and flickers only dimly; the middle lamp is of intermediate brightness and appears to flicker more distinctly; and the upper lamp is on half the time and off half the time, on average, with the average brightness being less than either of the lower lamps and the flickering effect being more pronounced than that of either the lower or middle lamps.

대표청구항 ▼

An electronic lighting apparatus for simulating a flame, comprising a plurality of electric lamps arranged vertically in spaced apart relationship, and control signal generator means for generating respective control signals for turning said lamps on and off in a manner so as to simulate both the il

An electronic lighting apparatus for simulating a flame, comprising a plurality of electric lamps arranged vertically in spaced apart relationship, and control signal generator means for generating respective control signals for turning said lamps on and off in a manner so as to simulate both the illumination intensity distribution and the gas turbulence of a natural flame, said control signals operating to turn said lamps on and off in a random sequence, with the average proportion of time during which said lamps are turned on progressively increasing toward the lowermost of said plurality of lamps so as to obtain an average illumination intensity which progressively increases toward the lowermost of said plurality of lamps, and with the average duration of the intermittent periods during which said lamps are turned off decreasing progressively toward the lowermost of said plurality of lamps, whereby a flickering effect is obtained which is progressively more pronounced toward the uppermost of said plurality of lamps, thereby simulating the gas turbulence distribution of a natural flame.