US3814494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for optically and uniformly scanning a flat surface
Assignee: Hitachi Ltd
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Filing: 1972-09-15
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Granted: 1974-06-04
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Expires: 1992-09-15
Abstract
Abstract A method and apparatus for uniformly scanning a flat surface of a paper sheet wherein the flat surface of the paper sheet is optically uniformly scanned using a light beam reflected by a rotating mirror non-uniformly rotated by means of a link mechanism or cam mechanism without curving the surface of the paper sheet or without effecting any electrical controlling.
Inventors
- 👤 Y Shiragai
- 👤 T Maeno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:41
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/04; H04N1/113; H04N1/1135; G; G06; G06V; G06V10/00; G06V10/10; G06V10/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
116 words
A method for uniformly scanning a flat surface comprising the step of directing a light beam emanating from a point light source at a rotatable flat mirror to thereby direct a light spot to said flat surface, rotating said mirror to move said light spot over said flat surface with an angular velocity defined by the expression d phi /dt v/2l cos2 2 phi where phi represents the angle of rotation of the rotating mirror measured from an initial position, l represents the length of the perpendicular from the center of the rotating mirror to the flat surface to be scanned, and v represents a scanning velocity of a light spot running on the flat surface.
Claim 2
Independent Claim
116 words
A method for uniformly scanning a flat surface comprising the step of directing a light beam emanating from a point light source at a rotatable flat mirror to thereby direct a light spot to said flat surface, rotating said mirror to move said light spot over said flat surface with an angular velocity defined by the expression d phi /dt v/2l cos2 2 phi where phi represents the angle of rotation of the rotating mirror measured from an initial position, l represents the length of the perpendicular from the center of the rotating mirror to the flat surface to be scanned, and v represents a scanning velocity of a light spot running on the flat surface.
Claim 3
Independent Claim
127 words
A device for uniformly scanning a flat surface comprising a first link pivotally mounted for rotation about a first axis, a mirror connected to said first link at said first axis for rotation therewith, a second link pivotally mounted for rotation about a second axis parallel to said first axis and having a portion disposed between said second axis and one end thereof contacting one end of said first link, and a linearly movable slider engaged with said one end of said second link for effecting linear motion of said second link at a constant velocity, the distance between the centers of said first and second axes being equal to the distance from said second axis to the portion of said second link contacting said first link.
Claim 4
Independent Claim
127 words
A device for uniformly scanning a flat surface comprising a first link pivotally mounted for rotation about a first axis, a mirror connected to said first link at said first axis for rotation therewith, a second link pivotally mounted for rotation about a second axis parallel to said first axis and having a portion disposed between said second axis and one end thereof contacting one end of said first link, and a linearly movable slider engaged with said one end of said second link for effecting linear motion of said second link at a constant velocity, the distance between the centers of said first and second axes being equal to the distance from said second axis to the portion of said second link contacting said first link.
Claim 5
Independent Claim
50 words
An apparatus for uniformly scanning a flat surface comprising an arm mounted for rotation about an axis, a flat mirror mounted on said arm at said axis, and a cam engaged with one end of said arm for rotating said arm, said cam having a profile defined by the expression
Claim 6
Independent Claim
50 words
An apparatus for uniformly scanning a flat surface comprising an arm mounted for rotation about an axis, a flat mirror mounted on said arm at said axis, and a cam engaged with one end of said arm for rotating said arm, said cam having a profile defined by the expression
Claim 7
Dependent Claim
30 words
A device as defined in claim 2, further including a spring member interconnecting said first and second links to effect coordinate movement thereof in response to movement of said slider.
Claim 8
Dependent Claim
49 words
A device as defined in claim 4 wherein said slider comprises a piston having a roller mounted thereon in contact with said second link, a cylinder containing a pOrtion of said piston and means for effecting reciprocation of said piston portion in said cylinder to actuate said second link.
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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) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |