US3575509A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slit exposure device
Assignee: Ricoh Co Ltd
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Filing: 1969-03-13
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Granted: 1971-04-20
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Expires: 1989-03-13
Abstract
Abstract A slit exposure device comprising an original document holder and an exposure slit both of which are held stationary and a movable optical system for directing light from the original document through the exposure slit to a photosensitive recording surface which is moved in a plane parallel to the plane of the document holder. The optical system comprises a fixed reflecting mirror adjacent the exposure slit over which the photosensitive recording surface is moved in synchronism with a scanning mirror. Cross-shaped mirrors and a unitary lens-mirror move in synchronism with the scanning mirror but at a speed one-half that of the scanning mirror, the unitary lens-mirror moving both perpendicular to and in the same direction as that of the scanning mirror and cross-shaped mirrors.
Inventors
- 👤 Shigeru Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:04
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/52; G03B27/522; G03B27/525; G03B27/526
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
262 words
A slit exposure device comprising: a photocopying lens having a reflecting mirror disposed integrally at the rear surface of said lens; a cross-shaped reflecting mirror having two reflecting surfaces directed toward said lens at right angles relative to an imaginary plane containing the optical axis of said lens, side edges of said reflecting surfaces in contact with said imaginary plane being inclined at 45* to said optical axis and the intersecting point of said side edges being coincident with said optical axis, a stationary and movable reflecting mirror disposed on the opposite sides of said cross-shaped reflecting mirror and inclined at 45* in the opposed directions with each other relative to a straight line passing through said intersecting point and at right angle relative to said imaginary plane, a slit held stationarily upon a plane in parallel with said imaginary plane and in opposed relation with said stationary reflecting mirror, an original holder held stationarily in a plane parallel with said imaginary plane at a position spaced-apart from said lens by an optical length equal to that between said slit and said lens; and means for moving said lens and said cross-shaped reflecting mirror at a speed one-half that of a photocopying paper moving across and in contact with said slit in the same direction with that of said photocopying paper and concurrently moving said lens along its optical axis at a speed one-half that of said photocopying paper while moving said movable reflecting mirror at a speed equal to that of said photocopying paper in the same direction of said paper.
Claim 2
Dependent Claim
262 words
A slit exposure device comprising: a photocopying lens having a reflecting mirror disposed integrally at the rear surface of said lens; a cross-shaped reflecting mirror having two reflecting surfaces directed toward said lens at right angles relative to an imaginary plane containing the optical axis of said lens, side edges of said reflecting surfaces in contact with said imaginary plane being inclined at 45* to said optical axis and the intersecting point of said side edges being coincident with said optical axis, a stationary and movable reflecting mirror disposed on the opposite sides of said cross-shaped reflecting mirror and inclined at 45* in the opposed directions with each other relative to a straight line passing through said intersecting point and at right angle relative to said imaginary plane, a slit held stationarily upon a plane in parallel with said imaginary plane and in opposed relation with said stationary reflecting mirror, an original holder held stationarily in a plane parallel with said imaginary plane at a position spaced-apart from said lens by an optical length equal to that between said slit and said lens; and means for moving said lens and said cross-shaped reflecting mirror at a speed one-half that of a photocopying paper moving across and in contact with said slit in the same direction with that of said photocopying paper and concurrently moving said lens along its optical axis at a speed one-half that of said photocopying paper while moving said movable reflecting mirror at a speed equal to that of said photocopying paper in the same direction of said paper.
References Cited (Backward Citations)
US3330181A
Cited
US3508825A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |