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US3748035A Expired / Lapsed US ⏱️ 0.0 years remaining

Method for sequential illumination in a polychrome process

Assignee: Xerox Corp
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Filing: 1971-12-28
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Granted: 1973-07-24
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Expires: 1991-12-28
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Abstract

Abstract An illumination system is provided for a polychromatic imaging process of the type wherein a polychromatic original is illuminated by light from a continuous spectrum light source and the resultant light image is projected onto a narrow imaging zone which progressively traverses the length of an imaging layer which comprises at least two differently-colored, electrically photosensitive materials which are sensitive to light of predetermined, different wavelengths. A filter member having at least one group of at least two differently colored filters is rotated between a continuous spectrum light source and the imaging layer. The colored filters are selected to reduce or eliminate certain radiation bands which interfere with the production of the best quality image. Transverse speed pattern lines are effectively eliminated by rotating the disc at filter disc rotation/imaging zone speed values of above about 40 cycles/in. At lower ratios the transverse speed pattern lines can be effectively eliminated by bypassing a predetermined amount of unfiltered light.

Inventors

  • 👤 K Mannik

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-07 10:53
CPC Classifications
G; G03; G03G; G03G17/00; G03G17/04; G03G13/00; G03G13/01

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 143 words
In a process of forming a polychromatic image of a polychromatic original wherein the original image is illuminated by light from a continuOus spectrum light source and the resultant light image is projected onto a narrow imaging zone which progressively traverses the length of an imaging layer which is positioned within an electric field in at least the area of the imaging zone and comprises at least two differentlycolored, electrically photosensitive materials which are sensitive to light of predetermined, different wavelengths, the improvement which comprises: cyclically interposing in the path of said light a filter group having filters of at least two different colors, to thereby remove from the light image color components which undesirably sensitize the electrically photosensitive materials, at a filter member rotation/imaging zone speed value of at least 1/i, where i is the width of the imaging zone in inches.
Claim 2
Dependent Claim 143 words
In a process of forming a polychromatic image of a polychromatic original wherein the original image is illuminated by light from a continuOus spectrum light source and the resultant light image is projected onto a narrow imaging zone which progressively traverses the length of an imaging layer which is positioned within an electric field in at least the area of the imaging zone and comprises at least two differentlycolored, electrically photosensitive materials which are sensitive to light of predetermined, different wavelengths, the improvement which comprises: cyclically interposing in the path of said light a filter group having filters of at least two different colors, to thereby remove from the light image color components which undesirably sensitize the electrically photosensitive materials, at a filter member rotation/imaging zone speed value of at least 1/i, where i is the width of the imaging zone in inches.
Claim 3
Dependent Claim 24 words
The process according to claim 1 wherein the color filter elements are angular segments of a disc which is rotated at a predetermin3d speed.
Claim 4
Dependent Claim 26 words
the process according to claim 1 wherein a predetermined amount of illumination from the continuous spectrum light source is caused to bypass the color filter elements.
Claim 5
Dependent Claim 22 words
The process according to claim 1 wherein the filter member rotation/imaging zone speed value is greater than about 40 cycles per inch.
Claim 6
Dependent Claim 22 words
The process according to claim 1 wherein the filter member rotation/imaging zone speed value is greater than about 50 cycles per inch.
Claim 7
Dependent Claim 22 words
The process according to claim 1 wherein the filter member rotation/imaging zone speed value is greater than about 6 cycles per inch.
Claim 8
Dependent Claim 21 words
The process according to claim 1 wherein the filter group comprises filters of the three primary colors red, green and blue.
Claim 9
Dependent Claim 34 words
The process according to claim 3 wherein the color filter elements are angular segments of a disc and light bypass is effected by providing at least one transparent, concentric ring of predetermined radial extent.

References Cited (Backward Citations)

US2960911A Cited
US3282190A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-07-23 1977-01-22 1977-07-24 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-07-23 1981-01-22 1981-07-24 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-07-23 1985-01-22 1985-07-24 $7700.00 Window Closed / Lapsed

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