The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 04, 1991
Filed:
Apr. 21, 1989
Barry N Stone, Hartland, WI (US);
Richard C Rice, Oconomowoc, WI (US);
John E Lorbiecki, Hubertus, WI (US);
Stanley Bernstein, Milwaukee, WI (US);
Camtronics, Ltd., Wukesha, WI (US);
Abstract
A predetermined gradation of film transmittance levels, e.g. a gray scale, provided by a film exposure system is calibrated so as to consistently create an image on photographic film in accordance with the predetermined gradation of film transmittance levels. A light source is responsive to a drive signal, for generating light so that the exposure of different portions of the film to the light can be varied as a function of the drive signal so as to vary the resulting transmittance level of the portions of the film after the exposed portions of film are developed in order that the image can be formed on the film, and a sensing device senses the transmittance level of a developed portion of film exposed to at least one preselected value of light exposure and generates a transmittance level signal representative of the sensed transmittance level. The drive signal is adjusted as a function of the sensed transmittance level so that the range of transmittance levels produced by exposing the film to the light in response to the adjusted drive signal approximates the predetermined gradation of film transmittance levels.