Controller for controlling stoppage-timing of application of vol

Details Controller for controlling stoppage-timing of application of vol Controller for controlling stoppage-timing of application of vol

1997-09-18

2000-05-30

Gray, David M.

Photography

Camera combined with or convertible to diverse art device

396 30, 396276, G03B 1748, G03B 2900, G03B 1750, G03B 7099

Patent

active

060700211

ABSTRACT:
A controller controls a termination time of an application of a voltage to an electro-developing recording medium such that an image can be recorded and developed with optimum contrast. The controller has a power source for applying a voltage to the medium, a transparency sensor for detecting a transparency of the medium, and a differentiator for differentiating a value of the detected transparency. The controller also has a comparator, a determiner, and a stopper. The comparator compares the differentiated value with a predetermined threshold level. The determiner determines whether or not the differentiated value is greater than or equal to the predetermined threshold level. The stopper stops the application of the voltage to the medium when the determiner determines the differentiated value is greater than or equal to the predetermined threshold level.

REFERENCES:
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patent: 5408341 (1995-04-01), Takanashi et al.
patent: 5424156 (1995-06-01), Aoki et al.
patent: 5444509 (1995-08-01), Ohishi
patent: 5514504 (1996-05-01), Iijima et al.
patent: 5555205 (1996-09-01), Okabe
patent: 5631705 (1997-05-01), Tani
patent: 5646927 (1997-07-01), Shimizu et al.
English Language Translation of Japanese Unexamined Patent Publication No. 7-13132.
English Language Translation of Japanese Unexamined Patent Publication No. 6-313894.
English Language Translation of Japanese Unexamined Patent Publication No. 7-72505.

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