Patent US3897250A successfully refreshed from Google Patents.
US3897250A
Expired / Lapsed
US
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Method and apparatus for exposing a light-sensitive layer
Assignee: Wagner und Cie AG
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Filing: 1973-04-30
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Granted: 1975-07-29
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Expires: 1993-04-30
Abstract
Abstract A method of and apparatus for exposing a light-sensitive layer employed for the manufacture of reproductions of black-and-white or colored patterns, wherein the image of the pattern which has been projected onto a support is taken by means of an electronic camera and stored in a recording carrier. The light-sensitive layer initially is purely optically exposed with the image of the pattern. The light-sensitive layer is also additionally exposed with the stored image for correction of contrast and/or color shade.
Inventors
- 👤 Paul Weishaupt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:44
CPC Classifications
G; G03; G03B; G03B15/00; G03B27/00; G03B27/72; G03B27/727
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
130 words
A METHOD OF EXPOSING A LIGHT-SENSETIVE LAYER EMPLOYED FOR THE MANUFACTURER OF REPRODUCTIONS OF BLACK-AND -WHITE OR COLOUR PATTERNS CONPRISING THE STEPS OF: PROJECTING THE IMAGE OF A PATTERN ONTO A WHITE OR REFLECTIVE SUPPOT SUPPORT, VIEWING THE PROJECTED PATTERN IMAGE ON THE SUPPORT WITH AN ELECTRONIC CAMERA HAVING A VIDEO OUTPUT SIGNAL, STORING THE VIDEO OUTPUT SIGNAL ON A RECORDING CARRIER, OPTICALLY EXPOSING ALL POINTS OA LIGHT-SENSITIVE LAYER WITH THE PATTERN IMAGE USING BROAD-SURFACE ILLUMINATION WHICH PROVIDES A MAJOR PORTION OF THE TOTAL EXPOSURE, ADDITIONALLY EXPOSING THE LIGHT-SENSITIVE LAYER WITH A PROJECTED IMAGE DERIVED FROM THE VIDEO OUTPUT SIGNL STORED ON THE RECORDING CARRIER WHICH PROVIDES A SMALL PORTION OF THE TOTAL EXPOSURE FOR CORRECTING CONTRAST OR COLOR SHADES OR BOTH OF THE PATTERN REPRODUCED ON THE LIGHT-SENSITIVE LAYER.
Claim 2
Independent Claim
130 words
A METHOD OF EXPOSING A LIGHT-SENSETIVE LAYER EMPLOYED FOR THE MANUFACTURER OF REPRODUCTIONS OF BLACK-AND -WHITE OR COLOUR PATTERNS CONPRISING THE STEPS OF: PROJECTING THE IMAGE OF A PATTERN ONTO A WHITE OR REFLECTIVE SUPPOT SUPPORT, VIEWING THE PROJECTED PATTERN IMAGE ON THE SUPPORT WITH AN ELECTRONIC CAMERA HAVING A VIDEO OUTPUT SIGNAL, STORING THE VIDEO OUTPUT SIGNAL ON A RECORDING CARRIER, OPTICALLY EXPOSING ALL POINTS OA LIGHT-SENSITIVE LAYER WITH THE PATTERN IMAGE USING BROAD-SURFACE ILLUMINATION WHICH PROVIDES A MAJOR PORTION OF THE TOTAL EXPOSURE, ADDITIONALLY EXPOSING THE LIGHT-SENSITIVE LAYER WITH A PROJECTED IMAGE DERIVED FROM THE VIDEO OUTPUT SIGNL STORED ON THE RECORDING CARRIER WHICH PROVIDES A SMALL PORTION OF THE TOTAL EXPOSURE FOR CORRECTING CONTRAST OR COLOR SHADES OR BOTH OF THE PATTERN REPRODUCED ON THE LIGHT-SENSITIVE LAYER.
Claim 3
Dependent Claim
37 words
The method as defined in claim 1, including the step of interposing a color filter between the pattern and the electronic camera for color correction during the viewing of the projected pattern image by the electronic camera.
Claim 4
Dependent Claim
32 words
The method as defined in claim 1, including the step of varying the amplitude of the stored video output signal used to additionally expose the light-sensitive layer for carrying out contrast correction.
Claim 5
Dependent Claim
40 words
The method as defined in claim 1, including the step of reversing the polarity of the stored video output signal used to additionally expose the light-sensitive layer for projecting a positive or negative image of the stored video output signal.
Claim 6
Dependent Claim
28 words
The method as defined in claim 1, wherein the additional exposure of the light-sensitive layer occurs simultaneously with the simultaneous optical exposure thereof with the broad surface illumination.
Claim 7
Dependent Claim
28 words
The method as defined in claim 1, wherein the additional exposure of the light-sensitive layer occurs subsequently of the simultaneous optical exposure thereof with the broad surface illumination.
Claim 8
Dependent Claim
45 words
The method as defined in claim 1, including the step of separately storing on the recording carrier a video output signal for each primary color and additionally exposing the light-sensitive layer with projected images derived from the video output signal of each such stored recording.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-28 | 1979-01-27 | 1979-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-28 | 1983-01-27 | 1983-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-28 | 1987-01-27 | 1987-07-29 | $7700.00 | Window Closed / Lapsed |