Patent US3609024A successfully refreshed from Google Patents.
US3609024A
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: 1971-09-28
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Expires: 1989-03-13
Abstract
Abstract A slit exposure device comprising a stationary original holder and a slit for exposure and a movable optical system for directing to the slit the light from the original. This optical system includes a photocopying lens having a reflecting mirror integrally disposed at the rear surface of the lens, a V-shaped reflecting mirror having two reflecting surfaces and a movable reflecting mirror adapted to impinge upon the lens the light from the original, and the V-shaped reflecting mirror and a stationary reflecting mirror to impinge the light emanating from the lens to the slit. The lens moves in the direction normal to and parallel with the original at a speed one-half of that of a photocopying paper while the V-shaped and movable reflecting mirrors move in parallel with the original at speeds one-half and equal to that of the copying paper respectively.
Inventors
- 👤 Shigeru Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:33
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/52; G03B27/522; G03B27/525; G03B27/526
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
262 words
A slit exposure device for copying machines comprising an original holder; a shield plate for a copy paper, said plate including a slit to permit reflected light to be directed onto said copy paper, said slit and said original holder disposed in parallel planes; a movable reflecting mirror disposed in opposed relation to said original holder and adapted to reciprocate parallel to said original holder; a stationary reflecting mirror disposed in opposed relation to said slit; a V-shaped reflecting mirror having two reflecting surfaces extending from an intersection therein for reflecting light with respect to said movable and stationary reflecting mirrors, said V-shaped reflecting mirror mounted to reciprocate parallel to said original holder; a photocopying lens having an optical axis extending through said intersection of said V-shaped reflecting mirror, said optical axis being perpendicular to the parallel planes of said original holder and said plate, said lens having a reflecting mirror formed integrally with the rear face thereof, said lens disposed in a plane which is perpendicular to the optical axis; said lens and said mirrors Arranged in optical relation to each other to form an optical system; and said V-shaped mirror and said lens being movable at a speed onehalf of the speed of said movable mirror in the same direction therewith, said lens further being movable along its optical axis toward said V-shaped mirror at the same speed as the speed of said movable mirror whereby the optical length between said original holder and said lens is always maintained equal to that between said lens and said slit for exposure.
Claim 2
Dependent Claim
262 words
A slit exposure device for copying machines comprising an original holder; a shield plate for a copy paper, said plate including a slit to permit reflected light to be directed onto said copy paper, said slit and said original holder disposed in parallel planes; a movable reflecting mirror disposed in opposed relation to said original holder and adapted to reciprocate parallel to said original holder; a stationary reflecting mirror disposed in opposed relation to said slit; a V-shaped reflecting mirror having two reflecting surfaces extending from an intersection therein for reflecting light with respect to said movable and stationary reflecting mirrors, said V-shaped reflecting mirror mounted to reciprocate parallel to said original holder; a photocopying lens having an optical axis extending through said intersection of said V-shaped reflecting mirror, said optical axis being perpendicular to the parallel planes of said original holder and said plate, said lens having a reflecting mirror formed integrally with the rear face thereof, said lens disposed in a plane which is perpendicular to the optical axis; said lens and said mirrors Arranged in optical relation to each other to form an optical system; and said V-shaped mirror and said lens being movable at a speed onehalf of the speed of said movable mirror in the same direction therewith, said lens further being movable along its optical axis toward said V-shaped mirror at the same speed as the speed of said movable mirror whereby the optical length between said original holder and said lens is always maintained equal to that between said lens and said slit for exposure.
Claim 3
Dependent Claim
90 words
A slit exposure device according to claim 1 in which the reflecting surface of said movable mirror is opposed to the original holder at 45*; said stationary reflecting mirror is opposed to said slit for exposure at 45*; said reflecting surfaces of said V-shaped reflecting mirror are mounted at 45* relative to each other; and the reflecting surface of said movable reflecting mirror is in parallel with one of the reflecting surfaces of said V-shaped reflecting mirror and is at 135* relative to the optical axis of said copying lens.
Claim 4
Dependent Claim
172 words
A slit exposure device according to claim 1 in which said V-shaped reflecting mirror and said movable reflecting mirror are slidably carried by a guide element extending in parallel with said original holder; said lens is slidably carried by a guide member fixed to a mounting member associated with said V-shaped reflecting mirror; a first drive chain is provided for reciprocating said movable reflecting mirror; a second drive chain wrapped over a first pulley mounted on said mounting member of said V-shaped reflecting mirror has its one end fixed to said mounting member and its other end fixed to the machine; and a third drive chain wrapped over a second pulley of said mounting member has its one end fixed to said mounting member and its other end fixed to a supporting member of said lens; whereby said movable reflecting mirror is moved by said first drive chain and said V-shaped reflecting mirror and said lens are moved by said second and third drive chains in cooperation with said first drive chain.
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) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |