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US5705327A
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Color negative films with non-linear characteristic curve shape for telecine transfer applications
Assignee: Eastman Kodak Co
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Filing: 1996-09-16
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Granted: 1998-01-06
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Expires: 2016-09-16
Abstract
Abstract Color negative photographic films having red, green and blue color sensitive records, wherein the ratio of the toe area contrast to the mid-scale contrast for each of the red, green and blue color records is less than or equal to 0.80, and either at least two color records having a toe-area contrast less than or equal to 0.42 or a mid-scale contrast less than or equal to 0.55, or the film having a speed rating of ISO 200 or greater. The mid-scale contrast for a color record is defined as the slope of a straight line connecting a point C and and a point D on the characteristic curve of Status M density versus log Exposure for the color record, where points C and D are located by defining a point A on the characteristic curve at a density level 0.1 above minimum density, a point B is located on the characteristic curve at an exposure value +1.0 Log Exposure beyond point A, and points C and D are located at exposure values -0.45 log Exposure and +0.45 log Exposure with respect to point B, respectively. The toe-area contrast is the slope of a straight line connecting a point E and a point F on the characteristic curve, where point E is located at (mid-scale contrast)/6 density units above minimum density, and point F is located at 0.3 log Exposure higher in exposure on the characteristic curve than point E. Use of such a color negative films are particularly advantageous in making telecine transfers.
Inventors
- 👤 John Charles Brewer
- 👤 John Tyler Keech
- 👤 John Frank Sawyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:22
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/3041
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
237 words
An unexposed color negative photographic film comprising red, green and blue color sensitive silver halide emulsion records, wherein the ratio of the toe-area contrast to the mid-scale contrast for each of the red, green and blue color records is less than or equal to 0.80, and at least two of the color records have a mid-scale contrast less than or equal to 0.55 or a toe-area contrast less than or equal to 0.42, wherein (a) the mid-scale contrast for a color record is defined as the slope of a straight line connecting a point C and and a point D on the characteristic curve of Status M density versus log Exposure for the color record, where points C and D are located by defining a point A on the characteristic curve at a density level 0.1 above minimum density, a point B is located on the characteristic curve at an exposure value +1.0 Log Exposure beyond point A, and points C and D are located at exposure values -0.45 log Exposure and +0.45 log Exposure with respect to point B, respectively, and (b) the toe-area contrast is the slope of a straight line connecting a point E and a point F on the characteristic curve, where point E is located at (mid-scale contrast)/6 density units above minimum density, and point F is located at 0.3 log Exposure higher in exposure on the characteristic curve than point E.
Claim 2
Dependent Claim
237 words
An unexposed color negative photographic film comprising red, green and blue color sensitive silver halide emulsion records, wherein the ratio of the toe-area contrast to the mid-scale contrast for each of the red, green and blue color records is less than or equal to 0.80, and at least two of the color records have a mid-scale contrast less than or equal to 0.55 or a toe-area contrast less than or equal to 0.42, wherein (a) the mid-scale contrast for a color record is defined as the slope of a straight line connecting a point C and and a point D on the characteristic curve of Status M density versus log Exposure for the color record, where points C and D are located by defining a point A on the characteristic curve at a density level 0.1 above minimum density, a point B is located on the characteristic curve at an exposure value +1.0 Log Exposure beyond point A, and points C and D are located at exposure values -0.45 log Exposure and +0.45 log Exposure with respect to point B, respectively, and (b) the toe-area contrast is the slope of a straight line connecting a point E and a point F on the characteristic curve, where point E is located at (mid-scale contrast)/6 density units above minimum density, and point F is located at 0.3 log Exposure higher in exposure on the characteristic curve than point E.
Claim 3
Dependent Claim
40 words
An unexposed color negative photographic film according to claim 1 wherein each of the red, green and blue color records has a mid-scale contrast less than or equal to 0.55 or a toe-area contrast less than or equal to 0.42.
Claim 4
Dependent Claim
219 words
An unexposed color negative photographic film comprising red, green and blue color sensitive silver halide emulsion records and having a rated film speed of 200 ISO or greater, wherein the ratio of the toe-area contrast to the mid-scale contrast for each of the red, green and blue color records is less than or equal to 0.80, wherein (a) the mid-scale contrast for a color record is defined as the slope of a straight line connecting a point C and a point D on the characteristic curve of Status M density versus log Exposure for the color record, where points C and D are located by defining a point A on the characteristic curve at a density level 0.1 above minimum density, a point B is located on the characteristic curve at an exposure value +1.0 Log Exposure beyond point A, and points C and D are located at exposure values -0.45 log Exposure and +0.45 log Exposure with respect to point B, respectively, and (b) the toe-area contrast is the slope of a straight line connecting a point E and a point F on the characteristic curve, where point E is located at (mid-scale contrast)/6 density units above minimum density, and point F is located at 0.3 log Exposure higher in exposure on the characteristic curve than point E.
Claim 5
Dependent Claim
219 words
An unexposed color negative photographic film comprising red, green and blue color sensitive silver halide emulsion records and having a rated film speed of 200 ISO or greater, wherein the ratio of the toe-area contrast to the mid-scale contrast for each of the red, green and blue color records is less than or equal to 0.80, wherein (a) the mid-scale contrast for a color record is defined as the slope of a straight line connecting a point C and a point D on the characteristic curve of Status M density versus log Exposure for the color record, where points C and D are located by defining a point A on the characteristic curve at a density level 0.1 above minimum density, a point B is located on the characteristic curve at an exposure value +1.0 Log Exposure beyond point A, and points C and D are located at exposure values -0.45 log Exposure and +0.45 log Exposure with respect to point B, respectively, and (b) the toe-area contrast is the slope of a straight line connecting a point E and a point F on the characteristic curve, where point E is located at (mid-scale contrast)/6 density units above minimum density, and point F is located at 0.3 log Exposure higher in exposure on the characteristic curve than point E.
Claim 6
Dependent Claim
38 words
An unexposed color negative photographic film according to claim 3 wherein at least two of the color records have a mid-scale contrast less than or equal to 0.55 or a toe-area contrast less than or equal to 0.42.
Claim 7
Dependent Claim
40 words
An unexposed color negative photographic film according to claim 4, wherein each of the red, green and blue color records has a mid-scale contrast less than or equal to 0.55 or a toe-area contrast less than or equal to 0.42.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-01-05 | 2001-07-07 | 2002-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-01-05 | 2005-07-07 | 2006-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-01-05 | 2009-07-07 | 2010-01-06 | $7700.00 | Window Closed / Lapsed |