US4229097A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the photographic reproduction of transparent documents
Assignee: Bpifrance Financement SA
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Filing: 1978-05-31
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Granted: 1980-10-21
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Expires: 1998-05-31
Abstract
Abstract The apparatus comprises a principal light source, condenser, lenses, object and image planes movable with respect to one another and an auxiliary light exposure source. The condenser is constituted by two thin stepped lenses between which is arranged a corrector screen for the variations in illumination in the image plane due to the inclination of the useful beam to the axis of the system. This screen operates perpendicularly to its surface, the constituent elements of the source, of the condenser and of the pupil of the lenses used being fixed with respect to one another and movable in a single unit relative to the document to be reproduced according to the focal length of said lens determining the size of the document. The apparatus is useful for the reproduction of transparent documents in black and white or in color.
Inventors
- 👤 Huguette N. Vulmiere
- 👤 Jacques C. Vulmiere
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:22
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/52; G03B27/54; G03B27/545
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
183 words
Apparatus for the photographic reproduction of transparent documents in black and white or in color, of the type comprising a principal light source, colored or uncolored, a condenser, interchangeable objectives, object and image planes movable with respect to one another and an auxiliary light exposure source, wherein said condenser is constituted by two thin stepped lenses, the source being in the object focal plane of the first of said lenses and the pupil of the objective being in the image focal plane of the second lens, a corrector screen arranged between said two lenses for the variations in illumination in the image plane due to the inclination of the useful beam to the axis of the system, this screen being fixed so that its surface is perpendicular to the parallel ray beam, the constituent elements of the source, of the condenser and of the pupil of the objective used being fixed with respect to one another and movable in a single unit relative to the document to be reproduced according to the focal length of said objective determining the size of the document.
Claim 2
Dependent Claim
183 words
Apparatus for the photographic reproduction of transparent documents in black and white or in color, of the type comprising a principal light source, colored or uncolored, a condenser, interchangeable objectives, object and image planes movable with respect to one another and an auxiliary light exposure source, wherein said condenser is constituted by two thin stepped lenses, the source being in the object focal plane of the first of said lenses and the pupil of the objective being in the image focal plane of the second lens, a corrector screen arranged between said two lenses for the variations in illumination in the image plane due to the inclination of the useful beam to the axis of the system, this screen being fixed so that its surface is perpendicular to the parallel ray beam, the constituent elements of the source, of the condenser and of the pupil of the objective used being fixed with respect to one another and movable in a single unit relative to the document to be reproduced according to the focal length of said objective determining the size of the document.
Claim 3
Dependent Claim
66 words
Apparatus according to claim 1, wherein the principal source is a plane source focused in the plane of the pupil of the objective and is constituted by a light source, a disc with plane parallel or plane-concave surfaces wherein one or both faces can be frosted, and against which different diaphragms can be placed, then colored filters and chromatic aberration corrector glasses of the stepped lenses.
Claim 4
Dependent Claim
42 words
Apparatus according to claim 2, wherein said light source is constituted by a spiral pulsed XENON source surrounded by an internally reflecting truncated cone and within which is arranged an externally reflecting cone, the frosted glass being constituted by a divergent lens.
Claim 5
Dependent Claim
46 words
Apparatus according to claim 2, wherein said light source is constituted by a spiral pulsed XENON source with flattened turns parallel to each other and arranged in quincunx in a sectional plane transverse to the turns, the source being housed in a mirror of trough-shaped section.
Claim 6
Dependent Claim
46 words
Apparatus according to claim 2, wherein said light source is constituted by a spiral XENON source behind which is disposed a concave toroidal internally reflecting mirror, the centres of said mirror being slightly shifted with respect to the axis of the spiral constituting the XENON source.
Claim 7
Dependent Claim
34 words
Apparatus according to claim 5, wherein the spiral XENON source is surrounded by a concave spherical internally reflecting mirror, the centre of which being on the axis of the spiral constituting the XENON source.
Claim 8
Dependent Claim
29 words
Apparatus according to claim 1, comprising a correcting device for the chromatism of the thin lenses constituted by a thick glass plate in which a colored screen is mounted.
Claim 9
Dependent Claim
34 words
Apparatus according to claim 1, comprising a correcting device for the chromatism of the thin lenses constituted by a thick plate of suitable dispersion compensating for the chromatism for the whole of the spectrum.
Claim 10
Dependent Claim
21 words
Apparatus according to claim 1, wherein the two thin stepped lenses are identical and operate with a magnification equal to 1.
Claim 11
Dependent Claim
99 words
Apparatus according to claim 1, comprising an auxiliary exposure source constituted by an annular fluorescent source with adjustable luminance without change in its color temperature, housed in a box, in the bottom of which is arranged an element uniformly lighted by said annular fluorescent source, an objective formed by a meniscus producing the image of the lighted element in the average reproduction plane, a tubular screen coaxial with the meniscus interposed between the annular source and said element and an internally reflecting truncated cone to eliminate the cat's-eye effect at the level of the output pupil of the objective.
Claim 12
Dependent Claim
94 words
Apparatus according to claim 1, comprising an auxiliary exposure source constituted by an annular fluorescent source with adjustable luminance without change in its color temperature, housed in a box in the bottom of which is arranged an element uniformly lighted by said annular fluorescent source, an objective formed by a meniscus producing the image of a corrector screen placed against and before a field lens whose focus is coincident with the image of the front pupil of the meniscus, this front pupil being constituted by the small base of an internally reflecting truncated cone.
Claim 13
Dependent Claim
36 words
Apparatus according to claims 10 or 11 wherein the uniformly lighted element is a plane or spherical diffusing white screen, the position of which being adjustable with respect to the axis of the annular fluorescent source.
Claim 14
Dependent Claim
50 words
Apparatus according to claims 10 or 11, wherein the uniformly lighted element is an opaline transparent screen behind which is disposed a white opaque screen with radial degraded comprising in its centre an opening to place a photo-electric cell for the controlling of the intensity of the annular fluorescent source.
Claim 15
Dependent Claim
26 words
Apparatus according to claim 10 or 11 comprising in addition, in the plane of said front pupil, a diaphragm of variable aperture followed by colored screens.
References Cited (Backward Citations)
US4110036A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-10-21 | 1984-04-21 | 1984-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-21 | 1988-04-21 | 1988-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-21 | 1992-04-21 | 1992-10-21 | $7700.00 | Window Closed / Lapsed |