Patent US2647672A successfully refreshed from Google Patents.
US4145136A
Expired / Lapsed
US
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Scanning system for an electrostatic copying apparatus
Assignee: Canon Inc
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Filing: 1975-12-12
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Granted: 1979-03-20
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Expires: 1995-12-12
Abstract
Abstract A copying apparatus having a stationary or movable original to be copied, a lens movable parallel to the original and perpendicular to its optical axis, a photosensitive medium movable parallel to the lens and a flash lamp device for illuminating the entire surface of the original wherein movement of the elements satisfies the condition ##EQU1## where V 1 is the velocity of movement of the photosensitive medium and V 1 ' the velocity of movement of the light image at the surface of the medium.
Inventors
- 👤 Toru Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:30
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/04; G03B; G03B27/00; G03B27/32; G03B27/52; G03B27/522; G03B27/523; G03G15/043; G03G15/0435
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
167 words
A copying apparatus comprising a stationary or movable original holder, flash lamp means for illuminating the entire surface of an original on said holder, a lens movable in a direction perpendicular to its optical axis, a movable photosensitive medium having an image bearing surface for being exposed to a light image of said original projected through said lens, a plurality of fixed corona wires disposed adjacent the surface of the photosensitive medium for charging or discharging the surface of said photosensitive medium simultaneously with the exposure thereof to said light image, and means for establishing relative movement of said lens and photosensitive medium to satisfy the relation: ##EQU3## where V 1 is the velocity of movement of said photosensitive medium and V 1 ' the velocity of movement of the light image at the surface of said photosensitive medium, wherein said photosensitive medium is moved at a rate of at least 1mm. per 0.1mm of corona wire diameter during the time said flash lamp means is activated.
Claim 2
Dependent Claim
167 words
A copying apparatus comprising a stationary or movable original holder, flash lamp means for illuminating the entire surface of an original on said holder, a lens movable in a direction perpendicular to its optical axis, a movable photosensitive medium having an image bearing surface for being exposed to a light image of said original projected through said lens, a plurality of fixed corona wires disposed adjacent the surface of the photosensitive medium for charging or discharging the surface of said photosensitive medium simultaneously with the exposure thereof to said light image, and means for establishing relative movement of said lens and photosensitive medium to satisfy the relation: ##EQU3## where V 1 is the velocity of movement of said photosensitive medium and V 1 ' the velocity of movement of the light image at the surface of said photosensitive medium, wherein said photosensitive medium is moved at a rate of at least 1mm. per 0.1mm of corona wire diameter during the time said flash lamp means is activated.
References Cited (Backward Citations)
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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) | 1982-03-19 | 1982-09-18 | 1983-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-19 | 1986-09-18 | 1987-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-19 | 1990-09-18 | 1991-03-20 | $7700.00 | Window Closed / Lapsed |