Flicker suppression device in electronic equipment

Details Flicker suppression device in electronic equipment Flicker suppression device in electronic equipment

1998-12-15

2001-05-29

Pendegrass, Joan (Department: 2852)

Electrophotography

Control of electrophotography process

Control of fixing

C219S497000

Reexamination Certificate

active

06240263

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a flicker suppression device in an image record apparatus being an electronic equipment such as a copy machine, a printer or the like having a fixing heater.
2. Related Background Art
In a conventional image record apparatus, for example, in a copy machine having a main heater and a sub heater as fixing heaters, the main heater is lighted (turned on) for, e.g., 240 ms (microsecond) and the sub heater is lighted for, e.g., 160 ms every time a detected temperature of a fixing roller becomes lower than a target temperature.
Since a lighting time of the fixing heater is constant (i.e., not varied) in a standby state and also in a copy-sequence state, the fluctuation of power to be supplied to the fixing heater frequently repeats as shown in FIG.
5
. Therefore, voltage change frequently repeats in a power supplying path connected to the fixing heater in the standby state and also in the copy-sequence state. For this reason, a brightness flicker phenomenon is generated in an illumination equipment, a television or the like which is connected to a power supplying system identical with that of the fixing heater. This situation sometimes has brought unpleasant feeling called as a “flicker” for human eyes. It is desirable to decrease the flicker.
SUMMARY OF THE INVENTION
An object of the present invention is to provide flicker suppression device and method which solve the above-described problem and can decrease a brightness flicker in an illumination equipment, a television or the like connected to a power supplying system identical with that of a fixing heater.
Another object of the present invention is to provide the flicker suppression device and method which independently control main and sub heaters to decrease the flicker in an equipment on standby as much as possible.
Still another object of the present invention is to provide the flicker suppression device and method which decrease the flicker by minimizing the number of power change times in the standby state.
Still another object of the present invention is to provide an image formation apparatus and a control method thereof which decrease the flicker by changing each lighting time of the heater according to an operation condition of the image formation apparatus.
Other objects of the present invention will become apparent from the following description based on the accompanying drawings and the appended claims.


REFERENCES:
patent: 4268943 (1981-05-01), Watanabe et al.
patent: 4317270 (1982-03-01), Watanabe et al.
patent: 5532799 (1996-07-01), Watanabe et al.
patent: 5608508 (1997-03-01), Kumagai et al.
patent: 5747213 (1998-05-01), Okado et al.
patent: 5758228 (1998-05-01), Hirose et al.
patent: 5811764 (1998-09-01), Hirst
patent: 5937230 (1999-08-01), Iwase et al.
patent: 0 811 893 (1997-12-01), None
patent: 0 905 582 (1999-03-01), None
patent: 7-114296 (1995-05-01), None
patent: 9-197895 (1997-07-01), None

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