US4194834A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unit for reproducing transparent originals, or the like
Assignee: Zelacolor Systems
•
Filing: 1978-06-29
•
Granted: 1980-03-25
•
Expires: 1998-06-29
Abstract
Abstract A compact optical bench type unit for making selected color-component records of color transparencies for use in color printing comprises a light source with a rotary filter disc for directing a beam of selectively colored light through a light condenser which converges the beam through a color diapositive to be reproduced and into the objective of a camera. The condenser, possibly formed of Fresnel lenses, is of large dimensions to accomodate large diapositives, and the camera objective has a relatively short focal length. Chromatic aberration of the condenser is corrected by moving the light source in correspondence with rotation of the filter disc, or by selectively inserting correcting lenses in the beam.
Inventors
- 👤 Emile A. H. Guillaume
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:30
CPC Classifications
G; G03; G03F; G03F3/00; G03F3/04; G03B; G03B27/00; G03B27/32; G03B27/323; G03B27/52; G03B27/54; G03B27/542
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
154 words
A unit for reproducing transparent originals, or the like, comprising: a light generator for producing a beam of light; said light generator comprising a light source; a camera having a film plane; a condenser for directing light to the film plane of said camera; a carrier for supporting an original in the beam of light from said light source; said light source being shaped in the annular form, with said annular source having an axis directed toward said camera objective and said light source directing light from said light generator toward the film plane in said camera; said light source being movably mounted in said unit for enabling shifting of said light source toward and away from said objective, for permitting compensating of the loss of luminosity at the edges of the image due to vignetting of the camera objective and for obtaining also uniform light intensity on the film plane in the camera.
Claim 2
Dependent Claim
154 words
A unit for reproducing transparent originals, or the like, comprising: a light generator for producing a beam of light; said light generator comprising a light source; a camera having a film plane; a condenser for directing light to the film plane of said camera; a carrier for supporting an original in the beam of light from said light source; said light source being shaped in the annular form, with said annular source having an axis directed toward said camera objective and said light source directing light from said light generator toward the film plane in said camera; said light source being movably mounted in said unit for enabling shifting of said light source toward and away from said objective, for permitting compensating of the loss of luminosity at the edges of the image due to vignetting of the camera objective and for obtaining also uniform light intensity on the film plane in the camera.
Claim 3
Dependent Claim
14 words
The unit according to claim 1, wherein said annular source is a tubular lamp.
Claim 4
Dependent Claim
14 words
The unit according to claim 2, wherein said tubular lamp is a discharge tube.
Claim 5
Dependent Claim
32 words
The unit according to claim 1, wherein said light generator further comprises a second light source located at the center of said annular light source and directing light toward said camera objective.
Claim 6
Dependent Claim
38 words
The unit according to claim 1, wherein said light generator includes an outlet for light; an adjustable light generator diaphragm placed so that the light from said light source to said object passes through said light generator diaphragm.
Claim 7
Dependent Claim
17 words
The unit according to claim 5, further comprising filter means placed near to said light generator diaphragm.
Claim 8
Dependent Claim
28 words
The unit according to claim 6, wherein said filter means is placed in front of said light generator diaphragm and between said light generator diaphragm and said objective.
Claim 9
Dependent Claim
27 words
The unit according to claim 5, further comprising an adjustable objective diaphragm near said camera objective; said light generator diaphragm and said objective diaphragm being independently adjustable.
Claim 10
Dependent Claim
34 words
The unit according to either of claims 5, 6, 7, or 8, further comprising a diffusing element placed in front of said light generator diaphragm and between said light generator diaphragm and said objective.
Claim 11
Dependent Claim
26 words
The unit according to claim 1, further comprising light intensity measuring means in said camera for measuring light intensity at various locations at the film plane.
References Cited (Backward Citations)
US3510220A
Cited
US3639054A
Cited
US3829210A
Cited
US3874792A
Cited
US3984849A
Cited
US3854815A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-03-25 | 1983-09-24 | 1984-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-25 | 1987-09-24 | 1988-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-25 | 1991-09-24 | 1992-03-25 | $7700.00 | Window Closed / Lapsed |