Photocopying – Projection printing and copying cameras – Illumination systems or details
Patent
1994-08-05
1995-10-31
Adams, Russell E.
Photocopying
Projection printing and copying cameras
Illumination systems or details
355 41, G03B 2780
Patent
active
054634458
ABSTRACT:
A method for measuring image density of a color original in advance for adjusting exposure with which an image of the color original is to be printed on a photosensitive material which includes the steps of: conveying a negative film to a photometering stage provided with an opening through which light passes; irradiating light onto an image recorded on the negative film on the stage; making light having passed through each pixel of the image incident onto a spectral filter having a plurality of interference filter sections each of which transmits light of a different wavelength, and which are arrayed in a conveying direction of the negative film; and photometering each light wave having passed through respective interference filter sections of a spectral filter by means of a photometer. The spectral filter is optically arranged such that light waves which pass through respective divisions of the opening divided into units of pixel rows, are made incident onto different interference filter sections. After completion of the aforementioned photometering steps, the negative film is moved forward successively by a pixel row, each light wave having passed through the respective interference filter sections of the spectral filter is measured so as to photometer the light having passed through respective pixels on the negative film for various wavelengths.
REFERENCES:
patent: 4509854 (1985-04-01), Pearson
patent: 4951084 (1990-08-01), von Stein et al.
patent: 5162841 (1992-11-01), Terashita
English Language Abstract of Japanese Patent Application Laid-Open No. 3-230146, Takaaki Terashita, Oct. 14, 1991, p. 1296.
Adams Russell E.
Fuji Photo Film Co. , Ltd.
Malley D. P.
McKenna Peter A.
Turner Richard C.
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