Patent US3744901A successfully refreshed from Google Patents.
US3744901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic spot monitor apparatus
Assignee: Eastman Kodak Co
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Filing: 1971-10-07
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Granted: 1973-07-10
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Expires: 1991-10-07
Abstract
Abstract Photographic spot monitor apparatus includes a plurality of spot rings adapted to be selectively positioned in the near focal plane of a film transparency to thereby project the image of the ring onto the print plane defining the area being monitored. The monitoring apparatus positioned adjacent the optical axis of the printer, intercepts oblique light emanating through the spot ring from the film transparency and divides the light so intercepted into its basic color components to facilitate analysis of the color content of the transparency. The monitoring apparatus also includes a plurality of stops corresponding to said plurality of spot rings, each of said stops being selected for use with its corresponding ring.
Inventors
- 👤 J Harter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:05
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/72; G03B27/73
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
223 words
In photographic printing apparatus including a print plane, means for supporting an image bearing film in an object plane, a printing lens suitably positioned between said print plane and said object plane to focus an image of film supported by said film supporting means through the lens onto the print plane and means for illuminating film supported by said film supporting means for projection through the lens along a projection axis onto the print plane, improved monitoring apparatus comprising: spot ring apparatus, including at least one ring adapted to be movably positioned immediately adjacent the object plane of said film supporting means whereby projection of the image of film supported by said film supporting means onto the print plane includes projection of an image of said ring onto said print plane to define the area being monitored; a field lens located with respect to said image bearing film so as to be off the projection axis yet receive light therefrom for forming an image of film supported by said film supporting means in a primary image plane; stop means located in said primary image plane to restrict light passage to that light passing through said ring; and light detecting means for receiving light transmitted from said field lens through the stop means to thereby monitor the ring defined portion of the object plane.
Claim 2
Dependent Claim
223 words
In photographic printing apparatus including a print plane, means for supporting an image bearing film in an object plane, a printing lens suitably positioned between said print plane and said object plane to focus an image of film supported by said film supporting means through the lens onto the print plane and means for illuminating film supported by said film supporting means for projection through the lens along a projection axis onto the print plane, improved monitoring apparatus comprising: spot ring apparatus, including at least one ring adapted to be movably positioned immediately adjacent the object plane of said film supporting means whereby projection of the image of film supported by said film supporting means onto the print plane includes projection of an image of said ring onto said print plane to define the area being monitored; a field lens located with respect to said image bearing film so as to be off the projection axis yet receive light therefrom for forming an image of film supported by said film supporting means in a primary image plane; stop means located in said primary image plane to restrict light passage to that light passing through said ring; and light detecting means for receiving light transmitted from said field lens through the stop means to thereby monitor the ring defined portion of the object plane.
Claim 3
Dependent Claim
65 words
The invention according to claim 1 wherein said spot ring apparatus includes a plurality of rings of different size; said stop means includes a plurality of stops corresponding, respectively, to said plurality of rings; and further including means responsive to the selection of one of said rings being positioned adjacent said object plane to move the corresponding stop into position in said primary image plane.
Claim 4
Dependent Claim
21 words
The invention according to claim 1 further including an objective positioned between said primary image plane and said light detecting means.
Claim 5
Dependent Claim
65 words
The invention according to claim 1 additionally comprising a secondary illumination source adapted to be projected through said stop means and said field lens onto said image bearing film, whereby coincidence of the light so projected with said spot ring is indicative of proper alignment of the apparatus, verifying that said light detecting means is monitoring the area of the object film within said ring.
Claim 6
Dependent Claim
68 words
The invention according to claim 1, wherein said light detecting means comprises: a plurality of photo detectors; a plurality of color selective filters, one positioned proximate each of said photo detectors; and light splitting means adapted to split the incident light into a plurality of components of white light and direct said plurality of components of white light onto a respective one of said plurality of photo detectors.
Claim 7
Dependent Claim
39 words
The invention according to claim 2 wherein eAch of said stop means has positioned adjacent thereto a neutral density filter adapted to compensate for brightness variations resulting from the area differences of each of said plurality of stop means.
References Cited (Backward Citations)
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US3170367A
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US3222983A
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US3588246A
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US3554642A
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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) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |