Patent US3606535A successfully refreshed from Google Patents.
US3606535A
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Device for rectifying uneven distribution of illumination intensity in a slit exposure mechanism
Assignee: Ricoh Co Ltd
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Filing: 1969-02-14
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Granted: 1971-09-20
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Expires: 1989-02-14
Abstract
Abstract A SLIT EXPOSURE PHOTO-COPYING DEVICE HAVING AN OPTICAL SYSTEM WITH TWO REFLECTING MIRRORS JOINED AT A RIGHT ANGLE FOR PROJECTING AN IMAGE ALONG A PATH PARALLEL TO THE PARALLEL PLANES OF THE DOCUMENT TO BE COPIED AND THE PHOTOSENSITIVE SURFACE. A CONTOURED SHIELD PLATE IS INSERTED INTO THE SYSTEM AT THE JOINT OF THE MIRRORS IN ORDER TO RECTIFY THE UNEVEN DISTRIBUTION OF ILLUMINATION INTENSITY OF LIGHT REFLECTED FROM THE DOCUMENT TO THE PHOTOSENSITIVE SURFACE.
Inventors
- 👤 Yutaka Koizumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:17
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/52; G03B27/522; G03B27/525; G03B27/526; G03B27/527
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |