US4614423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable magnification copying apparatus
Assignee: Sharp Corp
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Filing: 1985-06-06
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Granted: 1986-09-30
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Expires: 2005-06-06
Abstract
Abstract An improved variable magnification copying apparatus which is provided with a function for controlling the lens position after completion of a copying operation so as to prevent occurrence of erroneous copying, with a consequent reduction of time required for the copying and simultaneous improvement of the operating efficiency.
Inventors
- 👤 Shoichiro Yoshiura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:12
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/50; G03G15/04; G03G15/041
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
143 words
A variable magnification copying apparatus having a function for detecting or inputting original document sizes so as to effect copying at converted magnifications by shifting lens positions according to the set copying magnifications, the improvement comprising a memory means for storing the detected or inputted original document size, an original document size comparing means for comparing the original document size previously stored with the original document size to be copied at present, a lens position returning means for returning the lens to a position corresponding to an equal size magnification copying in the case where there is a difference between the original document size previously stored and the original document size to be copied at present upon the comparison, and means for maintaining the previous copying magnification by releasing functions of said original document size comparing means and said lens position returning means.
Claim 2
Dependent Claim
143 words
A variable magnification copying apparatus having a function for detecting or inputting original document sizes so as to effect copying at converted magnifications by shifting lens positions according to the set copying magnifications, the improvement comprising a memory means for storing the detected or inputted original document size, an original document size comparing means for comparing the original document size previously stored with the original document size to be copied at present, a lens position returning means for returning the lens to a position corresponding to an equal size magnification copying in the case where there is a difference between the original document size previously stored and the original document size to be copied at present upon the comparison, and means for maintaining the previous copying magnification by releasing functions of said original document size comparing means and said lens position returning means.
Claim 3
Dependent Claim
35 words
A variable magnification copying apparatus as claimed in claim 1, wherein said memory means is an original document size memory area MA provided at a portion of a random access memory RAM of a micro-computer.
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) | 1989-09-29 | 1990-03-31 | 1990-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-29 | 1994-03-31 | 1994-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-29 | 1998-03-31 | 1998-09-30 | $7700.00 | Window Closed / Lapsed |