US4403853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slit exposure device
Assignee: Canon Production Printing Netherlands BV
•
Filing: 1981-07-13
•
Granted: 1983-09-13
•
Expires: 2001-07-13
Abstract
Abstract A slit exposure device movable back and forth in a path parallel to a stationary original for projecting an image of the original in linear portions onto a moving photosensitive element in belt form has a lamp for illuminating the original, an optical system, at least two interconnected belt deflecting rollers and a drive for moving these rollers with the optical system along and parallel to the object plane. At least one of the deflecting rollers deflects the photosensitive element counterclockwise and at least one of them deflects it clockwise from its original direction of movement, and the optical system projects the image in linear portions onto the photosensitive element at a location within the path formed by and between the deflected portions of the photosensitive element.
Inventors
- 👤 Petrus J. P. Hovens
- 👤 Adrianus H. Willemse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:53
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/28; G03G15/283; G03B; G03B27/00; G03B27/32; G03B27/52; G03B27/522; G03B27/525; G03B27/526; G03B27/527
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
134 words
A slit exposure device for projecting an image of an original onto a moving photosensitive belt, comprising a stationary object plane, means for illuminating the original, an optical system movable back and forth in a path parallel to said object plane, at least two interconnected belt deflecting rollers and drive means for moving said rollers along and parallel to the object plane with the optical system, at least one of said rollers deflecting the photosensitive belt counterclockwise from its original direction of movement and at least one of said rollers deflecting the belt in clockwise direction, said optical system being arranged to project the image of an original in linear portions onto the photosensitive belt at a location within the path formed by the portions of the belt on and between said deflecting rollers.
Claim 2
Dependent Claim
134 words
A slit exposure device for projecting an image of an original onto a moving photosensitive belt, comprising a stationary object plane, means for illuminating the original, an optical system movable back and forth in a path parallel to said object plane, at least two interconnected belt deflecting rollers and drive means for moving said rollers along and parallel to the object plane with the optical system, at least one of said rollers deflecting the photosensitive belt counterclockwise from its original direction of movement and at least one of said rollers deflecting the belt in clockwise direction, said optical system being arranged to project the image of an original in linear portions onto the photosensitive belt at a location within the path formed by the portions of the belt on and between said deflecting rollers.
Claim 3
Dependent Claim
57 words
A slit exposure device according to claim 1, said drive means comprising a pulley or a gear coupled by disconnectable clutch means to the shaft of one of said deflecting rollers for rotation therewith and substantially stationary guide means arranged at least largely parallel to said object plane and in non-slipping engagement with said pulley or gear.
Claim 4
Dependent Claim
50 words
A slit exposure device according to claim 2, said drive means comprising a said pulley and said guide means comprising a rope wound about said pulley and having taut leg portions extending in opposite directions from said pulley along a path substantially parallel to the path of said optical system.
Claim 5
Dependent Claim
79 words
A slit exposure device according to claim 1, 2, or 3, said illuminating means, said optical system and said belt deflecting rollers being mounted on a carriage that is movable back and forth in a path parallel to said object plane, said drive means being operative to move said carriage in one direction along said object plane for exposure of an original, and spring means for returning said carriage in the opposite direction upon disconnection of said drive means.
References Cited (Backward Citations)
US3792924A
Cited
US3955888A
Cited
US3947115A
Cited
US3958876A
Cited
US4129373A
Cited
US4183658A
Cited
JPS55135880A
Cited
US4334762A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-09-12 | 1987-03-14 | 1987-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-12 | 1991-03-14 | 1991-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-12 | 1995-03-14 | 1995-09-13 | $7700.00 | Window Closed / Lapsed |