Photocopying – Contact printing – Light boxes
Patent
1990-03-09
1991-02-05
Braun, Fred L.
Photocopying
Contact printing
Light boxes
118645, 355327, G03G 2100, G03G 1501
Patent
active
049909606
ABSTRACT:
Disclosed are a method of and a device for measuring different kinds of photosensitive toners each being sensitive to light with a different range of wavelengths and contained in a photosensitive toner mixture which is used for forming a color image by a single exposure and developing operation. One or more than one kind of light is selected from the different kinds of light having wavelengths to which the respective kinds of toners are sensitive, so as to be projected to the photosensitive toner mixture, so that one or more kinds of photosensitive toners sensitive to the projected light are discharged. The one or more kinds of discharged photosensitive toners are separated from the one or more kinds of charged photosensitive toners, and the amount of the charged photosensitive toners is measured. On the basis of the amount of each kind of photosensitive toner that is not sensitive to the projected light, the density of that photosensitive toner, or other photosensitive toners are determined.
REFERENCES:
patent: 3754821 (1973-08-01), Whited
patent: 4082061 (1978-04-01), Fraser
patent: 4113371 (1978-09-01), Fraser et al.
patent: 4506973 (1985-03-01), Ernst
Braun Fred L.
Mita Industrial Co. Ltd.
Royer William J.
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