US3733128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic microfilm re-enlarging apparatus
Assignee: Kalle GmbH and Co KG
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Filing: 1971-04-21
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Granted: 1973-05-15
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Expires: 1991-04-21
Abstract
Abstract This invention relates to an electrophotographic microfilm reenlargement apparatus comprising, for optical projection of a negative, an optical system including a plurality of lens means individually insertable into a projection beam and so selected that, with an at least approximately constant projection path, the negative can be projected, at a different enlargement factor for each lens, onto a fixed image plane, and pre-selectable drive means for moving optical elements of the optical system into positions corresponding to each available enlargement factor.
Inventors
- 👤 G Naumann
- 👤 G Marx
- 👤 E Blume
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:39
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/65; G03G15/6517; G03G15/6523; B; B23; B23D; B23D15/00; B23D15/06; B23D15/08; G02; G02B; G02B15/00; G03B; G03B21/00; G03B21/10; G03B21/11; G03B21/118; G03B27/00; G03B27/32; G03B27/52; G03B27/58; G03B27/587; G03B27/588; G03G15/04; G03G15/041; G03G15/22; G03G15/26
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
109 words
An electrophotographic microfilm re-enlargement apparatus comprising, for optical projection of a negative, an optical system including a plurality of commercially available projection lenses individually insertable into a projection beam and so selected that, with an approximately constant projection path, the negative can be projected, at a different enlargement factor for each lens, onto pre-selected locations of a fixed image plane, and pre-selectable drive means for moving optical elements of the optical system into pre-selected positions, the locations in the image plane and the corresponding positions of the movable optical elements being selected in accordance with the focal length of the respective lens whereby the exact enlargement factor is obtained.
Claim 2
Dependent Claim
109 words
An electrophotographic microfilm re-enlargement apparatus comprising, for optical projection of a negative, an optical system including a plurality of commercially available projection lenses individually insertable into a projection beam and so selected that, with an approximately constant projection path, the negative can be projected, at a different enlargement factor for each lens, onto pre-selected locations of a fixed image plane, and pre-selectable drive means for moving optical elements of the optical system into pre-selected positions, the locations in the image plane and the corresponding positions of the movable optical elements being selected in accordance with the focal length of the respective lens whereby the exact enlargement factor is obtained.
Claim 3
Dependent Claim
32 words
An apparatus according to claim 1 including, for control of the drive means for the movable optical elements, induction switch means whereby the said elements can be locked in their set positions.
Claim 4
Dependent Claim
47 words
An apparatus according to claim 2 including, for each movable optical element, a synchronous motor with permanenT magnet, the switching-off of which by a corresponding induction switch means being controllable such that an element employed for locking reaches its locking position with substantially no residual kinetic energy.
Claim 5
Dependent Claim
34 words
An apparatus according to claim 2 in which each drive means is contained in a logic circuit for moving the corresponding optical element from one set position to the other by the shortest route.
Claim 6
Dependent Claim
23 words
An apparatus according to claim 1 in which adjustment of the movable optical elements can give enlargement factors of 7.4, 10.5, and 14.8.
Claim 7
Dependent Claim
45 words
An apparatus according to claim 1 including exposure timer means so connected to means for setting to a particular enlargement factor that upon effecting such a setting the exposure timer is set to a time which varies with the square of the set enlargement factor.
Claim 8
Dependent Claim
31 words
An apparatus according to claim 1 including, in conjunction with the optical system, additional optical element means whereby an image of the negative can be projected on a screen for inspection.
Claim 9
Dependent Claim
40 words
An apparatus according to claim 1 including pre-selectable means for supplying to a cutting means, from one of a plurality of webs of copying material, a sheet of a size suitable to accommodate an image of a pre-selected enlargement factor.
Claim 10
Dependent Claim
80 words
An apparatus according to claim 8 including, for alternative supply of two webs of copying material, withdrawal means comprising a transport roller for each web and a pivoted roller for cooperation with either transport roller to feed one of the webs, and guide means for each web so fed, each guide means including an inlet slot, a confining element, a return element to retract the web from the cutting means, and means for prevention of reverse movement of the material.
Claim 11
Dependent Claim
21 words
An apparatus according to claim 9 in which the inlet slots and confining elements are accommodated in a single structural member.
Claim 12
Dependent Claim
40 words
An apparatus according to claim 1 so arranged that in its passage through a cutting, a charging, an exposure and a development section of the apparatus, the web or a sheet cut therefrom proceeds in a horizontal or near-horizontal plane.
Claim 13
Dependent Claim
33 words
Apparatus according to claim 1 the movable optical elements of which consist of mirror means which deflects by 90* and is movable in the direction of the optical axis of the projection lens.
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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) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |