Photocopying – Contact printing – Light boxes
Patent
1992-08-26
1994-06-28
Grimley, A. T.
Photocopying
Contact printing
Light boxes
346108, 358298, G03G 15048, G03G 1532
Patent
active
053251601
ABSTRACT:
A half tone recording method has the steps of representing one picture element of image information including inputted density information by a matrix composed of K.times.L small pixels where K designates the number of small pixels in a main scanning direction and L designates the number of small pixels in a sub-scanning direction and numbers K and L are integers equal to or greater than one and are not simultaneously set to one; freely selecting a light emitting pulse width of a light source within the one pixel in a divisional pulse unit obtained by dividing a pulse width T with respect to one micro pixel; freely selecting the light intensity of the light source about the divisional pulse at plural values of m kinds; increasing the light intensity about the divisional pulse in a certain micro pixel from a minimum intensity value to a maximum intensity value; and increasing the light intensity from the minimum intensity value about a divisional pulse in the micro pixel adjacent in the sub-scanning direction to the divisional pulse providing the maximum light intensity. A light source device for writing is used in execution of the half tone recording method.
REFERENCES:
patent: 4544264 (1985-10-01), Bassetti et al.
patent: 5144337 (1992-09-01), Imamura et al.
patent: 5144338 (1992-09-01), Sakano
patent: 5162820 (1992-11-01), Yamamoto et al.
Ema Hidetoshi
Imakawa Susumu
Grimley A. T.
Lee Shuk Y.
Ricoh & Company, Ltd.
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