US3748037A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for illuminating originals in microfilming apparatus
Assignee: Agfa Gevaert AG
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Filing: 1972-04-24
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Granted: 1973-07-24
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Expires: 1992-04-24
Abstract
Abstract A microfilming apparatus wherein a single incandescent lamp illuminates successive increments of a continuously moving stripshaped original in an image plane. The reflected light beam passes through a slit of a diaphragm and is focussed by a lens onto successive frames of a microfilm which moves continuously in the focal plane of the lens. The lamp is adjustable toward and away as well as transversely of the original in the image plane, and the width of the slit increases from its center toward both ends to compensate for the decreasing effective aperture of the lens in a direction from the optical axis toward its periphery as well as for decreasing intensity of light from the center toward the edges of the original. The lens is shielded from the lamp and is located between the two planes intermediate the microfilm and the lamp.
Inventors
- 👤 R Kulterer
- 👤 A Moll
- 👤 W Hofmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:20
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/52; G03B27/522; G03B27/525; G03B27/528
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
238 words
In a microfilming apparatus, a combination comprising means for advancing a strip-shaped original which is to be copied in a predetermined direction along a predetermined path so that successive increments of the original enter and move in and beyond a predetermined image plane; a source of light arranged to illuminate successive increments of the original in said image plane, said source being located substantially centrally of said path so that the intensity of light issuing from said source varies in a direction transversely of said path; a diaphragm extending across the beam of light reflected by successive increments of the original in said plane, said diaphragm having a light-transmitting slit extending transversely of said beam; an optical system located in the beam of reflected light which has passed through said slit to image successive increments of the original into a second plane, the effective aperture of said optical system varying transveRsely of said path and the width of said slit also varying transversely of said path as a function of variation of said effective aperture and as a function of said variation in the intensity of light issuing from said source; means for shielding said optical system from light which issues from said source; and means for transporting a photosensitive material in said second plane so that successive increments of the original in said image plane are imaged onto successive increments of photosensitive material in said second plane.
Claim 2
Dependent Claim
238 words
In a microfilming apparatus, a combination comprising means for advancing a strip-shaped original which is to be copied in a predetermined direction along a predetermined path so that successive increments of the original enter and move in and beyond a predetermined image plane; a source of light arranged to illuminate successive increments of the original in said image plane, said source being located substantially centrally of said path so that the intensity of light issuing from said source varies in a direction transversely of said path; a diaphragm extending across the beam of light reflected by successive increments of the original in said plane, said diaphragm having a light-transmitting slit extending transversely of said beam; an optical system located in the beam of reflected light which has passed through said slit to image successive increments of the original into a second plane, the effective aperture of said optical system varying transveRsely of said path and the width of said slit also varying transversely of said path as a function of variation of said effective aperture and as a function of said variation in the intensity of light issuing from said source; means for shielding said optical system from light which issues from said source; and means for transporting a photosensitive material in said second plane so that successive increments of the original in said image plane are imaged onto successive increments of photosensitive material in said second plane.
Claim 3
Dependent Claim
22 words
A combination as defined in claim 1, further comprising adjusting means actuatable to move said light source transversely of said predetermined path.
Claim 4
Dependent Claim
24 words
A combination as defined in claim 1, further comprising adjusting means actuatable to move said light source toward and away from said predetermined path.
Claim 5
Dependent Claim
16 words
A combination as defined in claim 1 wherein said light source comprises a single incandescent lamp.
Claim 6
Dependent Claim
21 words
A combination as defined in claim 4, wherein said light source is laterally adjacent to the optical axis of said system.
Claim 7
Dependent Claim
21 words
A combination as defined in claim 1, wherein the width of said slit decreases from both ends toward the center thereof.
Claim 8
Dependent Claim
28 words
A combination as defined in claim 1, further comprising means for reflecting some light issuing from said source onto successive increments of the original in said image plane.
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) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |