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Continuously Variable Gamma Diazo Films

IP.com Disclosure Number: IPCOM000093596D
Original Publication Date: 1967-Nov-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Dowden, BF: AUTHOR [+2]

Abstract

For certain applications, it is desirable to be able to vary the gamma of a diazotype film. This can be accomplished by formulating the diazo-type film with a sufficiently high concentration of diazo compound to give the film an initial high gamma. When the film is to be used and a certain gamma is desired, the film is first uniformly exposed to burn out a portion of the diazo compound which, in turn, lowers the gamma of the film. The exposure is for a time sufficient to reduce the concentration of the diazo compound such that, after exposure, the film has the desired gamma.

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Continuously Variable Gamma Diazo Films

For certain applications, it is desirable to be able to vary the gamma of a diazotype film. This can be accomplished by formulating the diazo-type film with a sufficiently high concentration of diazo compound to give the film an initial high gamma. When the film is to be used and a certain gamma is desired, the film is first uniformly exposed to burn out a portion of the diazo compound which, in turn, lowers the gamma of the film. The exposure is for a time sufficient to reduce the concentration of the diazo compound such that, after exposure, the film has the desired gamma. To preserve the spatial distribution of the diazo concentration and to prevent burnout at only the surface of the film, the wavelengths of the light for the uniform exposure are such that the extinction coefficient of the diazo compound at those wavelengths is low. Thus, the light is only weakly absorbed by the film during uniform exposure.

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