Patent US3792262A successfully refreshed from Google Patents.
US3792262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scanning initiation position detecting device
Assignee: Ricoh Co Ltd
•
Filing: 1972-11-22
•
Granted: 1974-02-12
•
Expires: 1992-11-22
Abstract
Abstract A device comprising a light source disposed on the upper or under side of a slit formed in an original support table and vertically spaced apart therefrom, and two photoelectric transducer elements disposed on the other side of the slit and vertically spaced apart therefrom, the transducer elements being arranged such that light from the same portion of the light source is incident upon them and one of them serving as a detecting element while the other serves as a reference element. As an original is fed to the original supply table, the position at which scanning of the original is initiated is detected accurately and positively irrespective of variations in the types of originals and irregularities in the intensity of light from the light source.
Inventors
- 👤 M Ogawa
- 👤 Y Satake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:18
CPC Classifications
B; B65; B65H; B65H7/00; B65H7/02; B65H7/14; G; G01; G01P; G01P13/00; H; H04; H04N; H04N1/00; H04N1/00567; H04N1/0057; H04N1/04; H04N1/047; H04N2201/00; H04N2201/04; H04N2201/047; H04N2201/04701; H04N2201/0471; H04N2201/04712; H04N2201/04732; H04N2201/04737
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
277 words
A scanning initiation position detecting device adapted for use with an original sheet scanning device for scanning various types of original sheets varying from one another in light transmitting property, said device comprising: a. an elongated light source disposed on one side of a path of travel of an original sheet, b. a photoelectric transducer element serving as a detection element and having a light introducing portion disposed opposite said light source with respect to the path of travel of the original sheet and juxtaposed to one predetermined portion of said light source, said light introducing portion of said first-mentioned photoelectric transducer element being disposed and adapted to receive light transmitted from said predetermined portion of said light source along a light path intersecting said path of travel when there is no original sheet on the path of travel such that occlusion of said light path by an original sheet on the path of travel reduces the light received by said first-mentioned photoelectric transducer element; c. a photoelectric transducer element serving as a reference element and having a light introducing portion disposed outside said path of travel and juxtaposed to said one predetermined portion of said light source, said light introducing portion of said last-mentioned photoelectric transducer element being adapted to receive light direct from said predetermined portion of said light source; and d. detection signal producing means for comparing the output of said photoelectric transducer element serving as a reference element with the output of said photoelectric transducer element serving as a detection element and producing a detection signal in response to a change in the relative magnitude of the outputs of the twO phototransducer elements.
Claim 2
Dependent Claim
277 words
A scanning initiation position detecting device adapted for use with an original sheet scanning device for scanning various types of original sheets varying from one another in light transmitting property, said device comprising: a. an elongated light source disposed on one side of a path of travel of an original sheet, b. a photoelectric transducer element serving as a detection element and having a light introducing portion disposed opposite said light source with respect to the path of travel of the original sheet and juxtaposed to one predetermined portion of said light source, said light introducing portion of said first-mentioned photoelectric transducer element being disposed and adapted to receive light transmitted from said predetermined portion of said light source along a light path intersecting said path of travel when there is no original sheet on the path of travel such that occlusion of said light path by an original sheet on the path of travel reduces the light received by said first-mentioned photoelectric transducer element; c. a photoelectric transducer element serving as a reference element and having a light introducing portion disposed outside said path of travel and juxtaposed to said one predetermined portion of said light source, said light introducing portion of said last-mentioned photoelectric transducer element being adapted to receive light direct from said predetermined portion of said light source; and d. detection signal producing means for comparing the output of said photoelectric transducer element serving as a reference element with the output of said photoelectric transducer element serving as a detection element and producing a detection signal in response to a change in the relative magnitude of the outputs of the twO phototransducer elements.
Claim 3
Dependent Claim
54 words
A device as set forth in claim 1 wherein said light introducing portion of said phototransducer element serving as a reference element and said light introducing portion of said phototransducer element serving as a detection element face directions which are disposed substantially at right angles to the direction of movement of the original sheet.
Claim 4
Dependent Claim
43 words
A device set forth in claim 1 wherein said photo-transducer element serving as a reference element and said photoelectric transducer element serving as a detection element are disposed on the same side with respect to the direction of movement of the original sheet.
Claim 5
Dependent Claim
36 words
A device as set forth in claim 1 including means defining a slit across which said path of travel extends, and wherein light from said light source is incident on the original sheet through said slit.
Claim 6
Dependent Claim
22 words
A device as set forth in claim 4 wherein said slit-defining means comprises an original support table, said slit splitting said table.
Claim 7
Dependent Claim
40 words
A device as set forth in claim 4 wherein said slit-defining means comprises a transparent member bearing a coat of opaque material, a portion of the transparent body being uncovered with the coat of opaque material to constitute the slit.
Claim 8
Dependent Claim
24 words
A device as set forth in claim 1 wherein said light source serves concurrently as a light source for read-out of an original sheet.
Claim 9
Dependent Claim
292 words
In apparatus for initiating scanning of an original sheet advancing along a defined path of travel, in combination, a. means for defining a path of travel for an original sheet; b. an elongated light source for illuminating a portion of the path of travel; c. first phototransducer means for producing an electrical output proportional to the level of light received thereby, disposed to receive light radiating from a predetermined portion of said light source along a light path extending through said path of travel in the absence of an original sheet in said path of travel such that arrival of an original sheet in position for initiation of scanning in said path of travel occludes said light path and thus reduces the level of light received by said first phototransducer means, as compared with the level of light received thereby absent an original sheet in said path of travel; d. second phototransducer means for producing an electrical output proportional to the level of light received thereby, disposed to receive light radiating from the same predetermined portion of said light source along a second light path that is not occluded by an original sheet arriving in scanning-initiation position as aforesaid so that arrival of an original sheet in said scanning-initiation position does not reduce the level of light received by said second phototransducer means; e. means for receiving and comparing the outputs of said first and second phototransducer means and for producing a control signal representative of a change in the relative magnitude of said outputs as representative of arrival of an original sheet in said scanning initiation position; and f. means for scanning an original sheet in said path of travel in response to production of a signal by said signal-producing means.
Claim 10
Dependent Claim
292 words
In apparatus for initiating scanning of an original sheet advancing along a defined path of travel, in combination, a. means for defining a path of travel for an original sheet; b. an elongated light source for illuminating a portion of the path of travel; c. first phototransducer means for producing an electrical output proportional to the level of light received thereby, disposed to receive light radiating from a predetermined portion of said light source along a light path extending through said path of travel in the absence of an original sheet in said path of travel such that arrival of an original sheet in position for initiation of scanning in said path of travel occludes said light path and thus reduces the level of light received by said first phototransducer means, as compared with the level of light received thereby absent an original sheet in said path of travel; d. second phototransducer means for producing an electrical output proportional to the level of light received thereby, disposed to receive light radiating from the same predetermined portion of said light source along a second light path that is not occluded by an original sheet arriving in scanning-initiation position as aforesaid so that arrival of an original sheet in said scanning-initiation position does not reduce the level of light received by said second phototransducer means; e. means for receiving and comparing the outputs of said first and second phototransducer means and for producing a control signal representative of a change in the relative magnitude of said outputs as representative of arrival of an original sheet in said scanning initiation position; and f. means for scanning an original sheet in said path of travel in response to production of a signal by said signal-producing means.
Claim 11
Dependent Claim
34 words
Apparatus as defined in claim 8, wherein said first and second phototransducer means are disposed and adapted to produce outputs of identical magnitude when there is no original sheet in said path of travel.
Claim 12
Dependent Claim
136 words
Apparatus as defined in claim 8, further including a table for supporting an original sheet advancing along said path of travel, and having formed therein a light-transmissive slit extending transversely of said path of travel, wherein said light source is an extended light source disposed on one side of said table in parallel relation to said slit for directing light therethrough, and wherein said first and second phototransducer means are disposed on the other side of said table and oriented for scanning the same predetermined portion of said light source through sAid slit in such respective positions that light from said predetermined portion of said light source radiates to said first phototransducer means through said path of travel and to said second phototransducer means through a portion of said slit external to said path of travel.
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) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |