US3887765A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical line scanning system
Assignee: Ricoh Co Ltd
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Filing: 1974-03-21
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Granted: 1975-06-03
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Expires: 1994-03-21
Abstract
Abstract An image of a line of an original document is projected onto an arc of a rotating scanner drum. A plurality of scanning elements fixed to the drum scan the line by sweeping the arc. A timing disc is fixed to the drum which contains one set of timing marks indicating the angular position of the drum relative to the position on the line being scanned. A separate sensing head is provided for each scanning element to sense the timing marks and produce timing output signals. Each sensing head is adjustable to compensate for manufacturing inaccuracy in the relative position of the associated scanning element relative to the timing marks.
Inventors
- 👤 Katsuo Murahse
- 👤 Kazuyuki Hara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:25
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/04; H04N1/12; H04N1/126; H04N1/129; H04N1/047; H04N1/053; H04N2201/00; H04N2201/04; H04N2201/047; H04N2201/04701; H04N2201/0471; H04N2201/04715; H04N2201/04734; H04N2201/04739
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
171 words
In an optical line scanning system having a rotary scanner body carrying a plurality of scanning elements thereon which are equiangularly spaced about the axis of the scanner body, and an optical system to focus an image of the line on the rotary scanner body so that the image of the line will be swept by the scanning elements upon rotation of the scanner body, the improvement comprising: a timing member rotatable with the scanner body and having one set of timing marks thereon indicating the angular position of the scanner body relative to the position of the line being scanned by the scanning elements; and a plurality of sensing heads arranged adjacent to said timing member to sense said timing marks and produce electrical signals in response thereto; the sensing heads being substantially equiangularly spaced about the circumference of the timing member and the number of said sensing heads being equal to the number of said scanning elements, each of said sensing heads being associated with a respective scanning element.
Claim 2
Dependent Claim
171 words
In an optical line scanning system having a rotary scanner body carrying a plurality of scanning elements thereon which are equiangularly spaced about the axis of the scanner body, and an optical system to focus an image of the line on the rotary scanner body so that the image of the line will be swept by the scanning elements upon rotation of the scanner body, the improvement comprising: a timing member rotatable with the scanner body and having one set of timing marks thereon indicating the angular position of the scanner body relative to the position of the line being scanned by the scanning elements; and a plurality of sensing heads arranged adjacent to said timing member to sense said timing marks and produce electrical signals in response thereto; the sensing heads being substantially equiangularly spaced about the circumference of the timing member and the number of said sensing heads being equal to the number of said scanning elements, each of said sensing heads being associated with a respective scanning element.
Claim 3
Dependent Claim
171 words
In an optical line scanning system having a rotary scanner body carrying a plurality of scanning elements thereon which are equiangularly spaced about the axis of the scanner body, and an optical system to focus an image of the line on the rotary scanner body so that the image of the line will be swept by the scanning elements upon rotation of the scanner body, the improvement comprising: a timing member rotatable with the scanner body and having one set of timing marks thereon indicating the angular position of the scanner body relative to the position of the line being scanned by the scanning elements; and a plurality of sensing heads arranged adjacent to said timing member to sense said timing marks and produce electrical signals in response thereto; the sensing heads being substantially equiangularly spaced about the circumference of the timing member and the number of said sensing heads being equal to the number of said scanning elements, each of said sensing heads being associated with a respective scanning element.
Claim 4
Dependent Claim
171 words
In an optical line scanning system having a rotary scanner body carrying a plurality of scanning elements thereon which are equiangularly spaced about the axis of the scanner body, and an optical system to focus an image of the line on the rotary scanner body so that the image of the line will be swept by the scanning elements upon rotation of the scanner body, the improvement comprising: a timing member rotatable with the scanner body and having one set of timing marks thereon indicating the angular position of the scanner body relative to the position of the line being scanned by the scanning elements; and a plurality of sensing heads arranged adjacent to said timing member to sense said timing marks and produce electrical signals in response thereto; the sensing heads being substantially equiangularly spaced about the circumference of the timing member and the number of said sensing heads being equal to the number of said scanning elements, each of said sensing heads being associated with a respective scanning element.
Claim 5
Dependent Claim
20 words
The improvement according to claim 1, in which said timing member is fixed to the scanner body for rotation therewith.
Claim 6
Dependent Claim
18 words
The improvement according to claim 1, in which said timing member is integral with the rotary scanner body.
Claim 7
Dependent Claim
39 words
The improvement according to claim 1, in which said sensing heads are adjustable relative to the circumference of said timing member to compensate for manufacturing inaccuracy in the relative position of the scanning element relative to said timing marks.
Claim 8
Dependent Claim
86 words
The improvement according to claim 4, in which: said timing marks are provided as variations in optical density on said timing member; and in which each adjustable sensing head comPrises a projector arranged to focus a beam of light onto said timing marks, a width of the light beam being narrow enough to impinge upon only one timing mark, and a receiver comprising a photosensitive element arranged to have the beam of light incident thereupon and generate said electrical signals in response to sensed timing marks.
Claim 9
Dependent Claim
25 words
The improvement according claim 5, in which the optical density of said timing marks is less than that of the remainder of said timing member.
Claim 10
Dependent Claim
53 words
The improvement according to claim 5, in which said projector comprises a first converging optical element to focus the light beam on said timing marks, and said receiver further comprises a second converging optical element arranged between said timing member and said photosensitive element to focus the light beam on said photosensitive element.
Claim 11
Dependent Claim
40 words
The improvement according to claim 7, in which said receiver further comprises a mask arranged between said second converging optical element and said photosensitive element to limit the width of the light beam to be focussed onto the photosensitive element.
Claim 12
Dependent Claim
24 words
The improvement according to claim 7, in which said first and second converging optical elements are lenses, each having at least one convex surface.
Claim 13
Dependent Claim
166 words
An optical line scanning system comprising: a rotary scanner body carrying a plurality of scanning elements thereon which are equiangularly spaced about the axis of the scanner body; an optical system to focus an image of the line on the rotary scanner body so that the image of the line will be swept by the scanning elements upon rotation of the scanner body; a timing member rotatable with the scanner body and having one set of timing marks thereon indicating the angular position of the scanner body relative to the position on the line being scanned by the scanning elements; and a plurality of sensing heads arranged adjacent to said timing member to sense said timing marks and produce electrical signals in response thereto; the sensing heads being substantially equiangularly spaced about the circumference of the timing member and the number of said sensing heads being equal to the number of said scanning elements, each of said sensing heads being associated with a respective scanning element.
Claim 14
Dependent Claim
166 words
An optical line scanning system comprising: a rotary scanner body carrying a plurality of scanning elements thereon which are equiangularly spaced about the axis of the scanner body; an optical system to focus an image of the line on the rotary scanner body so that the image of the line will be swept by the scanning elements upon rotation of the scanner body; a timing member rotatable with the scanner body and having one set of timing marks thereon indicating the angular position of the scanner body relative to the position on the line being scanned by the scanning elements; and a plurality of sensing heads arranged adjacent to said timing member to sense said timing marks and produce electrical signals in response thereto; the sensing heads being substantially equiangularly spaced about the circumference of the timing member and the number of said sensing heads being equal to the number of said scanning elements, each of said sensing heads being associated with a respective scanning element.
Claim 15
Dependent Claim
23 words
An optical line scanning system according to claim 10, in which said timing member is fixed to the scanner body for rotation therewith.
Claim 16
Dependent Claim
39 words
An optical line scanning system according to claim 10, in which the scanner body is a drum, and the image of the line, when focussed on the drum by the optical system, defines substantially an arc of a circle.
Claim 17
Dependent Claim
19 words
An optical line scanning system according to claim 12, in which the timing member is integral with the drum.
Claim 18
Dependent Claim
25 words
An optical line scanning system according to claim 10, in which the timing marks are provided as variations in optical density on the timing member.
Claim 19
Dependent Claim
29 words
An optical line scanning system according to claim 14, in which the optical density of the timing marks is less than that of the remainder of the timing member.
Claim 20
Dependent Claim
42 words
An optical line scanning system according to claim 10, in which said sensing heads are adjustable relative to the circumference of said timing member to compensate for manufacturing inaccuracy in the relative position of the scanning element relative to said timing marks.
Claim 21
Dependent Claim
74 words
An optical line scanning system according to claim 16, in which each of said adjustable sensing heads comprises: a projector arranged to focus a beam of light onto the timing marks, the width of the light beam being narrow enough to impinge upon only one timing mark; and a receiver comprising a photosensitive element arranged to have the beam of light incident thereupon and generate the electrical signals in response to sensed timing marks.
Claim 22
Dependent Claim
84 words
An optical line scanning system according to claim 17, in which the projector comprises a first converging optical element to focus the light beam onto the timing marks, and the receiver coMprises a second converging optical element arranged between the timing member and the photosensitive element to focus the light beam on the photosensitive element, and a mask arranged between the second converging optical element and the photosensitive element to limit the width of the light beam to be focussed onto the photosensitive element.
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) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |