Abstract In a color image pickup device a banded color filter and a lens screen are interposed between an object to be televised and the photosensitive conversion layer of an image pickup tube to provide a striped color-separated image of the object on the photosensitive layer, with the color filter at a finite distance in front of the lens screen and with the distance from the lens screen to the layer being selected in relation to such finite distance, the pitch of the lens elements making up the lens screen and the pitch of the filter elements of the banded color filter, so that images of the color filter are overlappingly projected on the photosensitive conversion layer for optimum brightness and contrast of the reproduced picture.
Inventors
👤 Setsuo Usui
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-26 00:07
CPC Classifications
H; H04; H04N; H04N23/00; H04N23/10; H04N23/12
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
226 words
In a color image pickup device having image pickup means with a photosensitive conversion layer, a single banded color filter with a plurality of color filter elements of different wavelength band-pass characteristics and which are sequentially arranged in order in a repeating cycle, and a lens screen consisting of a plurality of lens elements, the banded color filter and the lens screen being interposed between an object to be televised and said conversion layer to provide on the latter a striped colorseparated image of the object; the improvement comprising disposing said single color filter at a finite distance x from said lens screen, and disposing said lens screen at a distance ls from said conversion layer which is in accordance with the equation in which, P is the pitch of each of said lens elements of the lens screen, a is the width of said repeating cycle of the color filter elements of said banded color filter, and S is an integer equal to the ratio n/K where n and K are respectively the periodicities of said color filter elements and of said lens elements, whereby many color filter images are overlappingly projected on said conversion layer of the image pickup means. CM,14Color image pickup device according to claim 1, in which S is a positive integer, and said lens elements have a positive focal length.
Claim 2
Dependent Claim
25 words
A color image pickup device according to claim 1, in which S is a negative integer, and said lens elements have a negative focal length.
Claim 3
Dependent Claim
60 words
A color image pickup device according to claim 1, in which S is a negative integer, said lens elements have a negative focal length to project virtual images of said color filter in a plane between said lens screen and said color filter, and further lens means are provided to project real overlapped color filter images on said conversion layer.