US3583809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for obtaining orthophotoplans
Assignee: Optique Et Di Mecanique S F O
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Filing: 1969-07-29
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Granted: 1971-06-08
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Expires: 1989-07-29
Abstract
Abstract Apparatus for obtaining colored orthophotoplans comprises two white light projectors providing convergent beams projecting corresponding portions of a stereoscopic pair of color photographic transparencies onto a table disposed at an adjustable distance from the projectors and carrying a colorsensitive surface. A reference mark is disposed a small distance from the table and can be brought into the zone of convergence of the projector beams. A stereoscopic observation system allows the reference mark and projected images to be observed, such system including means for periodically and alternately obturating the beams in synchronism with alternate masking of the fields of view of an observer''s eyes. A periodic masking means allows only one of the beams to reach the sensitive surface at a time whilst permitting observation of the projected images and reference mark at all times. A movable screen covers the sensitive surface and has a slot disposable at the zone of convergence of the beams. Various embodiments of masking means are envisaged for periodically uncovering the slot, namely a reciprocable thin sheet, a rotatable apertured shutter in the form of a closed loop and a rotatable disc with opaque and transparent regions.
Inventors
- 👤 Bernard Louis Yves Dubuisson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:51
CPC Classifications
G; G01; G01C; G01C11/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
261 words
Apparatus for obtaining orthophotoplans, comprising: two white light projectors providing convergent beams of light; means for mounting a stereoscopic pair of color transparencies in said projectors for projection by said convergent beams of light; a table spaced from said projectors onto which said convergent beams project images of portion of the transparencies corresponding to a given portion of the subject of the photograph; means for adjusting the distance of said table from said projectors; a movable reference mark carried by said table a short, constant distance from said table; the arrangement being such that, for each subject portion projected, the reference mark is placed in the zone of convergence of the beams and the positions of the transparencies relative to the beams substantially correspond to their positions relative to the beams coming from the subject portion concerned during photographing; means for stereoscopically observing said reference mark and the projected images; first interceptor means in said stereoscopic observation means for periodically and alternately intercepting the projector beams; and second interceptor means in said stereoscopic observation means for alternately masking the fields of view of the eyes of an observer looking at the table in synchronism with said means for periodically and alternately intercepting the projector beams; wherein the improvement comprises: a color-sensitive surface situated on said table; and periodic masking means disposed adjacent said table operative to allow only the beam from one of said projectors to reach said color-sensitive surface whilst permitting constant simultaneous observation of said reference mark and of the images projected by the bEams from said two projectors.
Claim 2
Dependent Claim
261 words
Apparatus for obtaining orthophotoplans, comprising: two white light projectors providing convergent beams of light; means for mounting a stereoscopic pair of color transparencies in said projectors for projection by said convergent beams of light; a table spaced from said projectors onto which said convergent beams project images of portion of the transparencies corresponding to a given portion of the subject of the photograph; means for adjusting the distance of said table from said projectors; a movable reference mark carried by said table a short, constant distance from said table; the arrangement being such that, for each subject portion projected, the reference mark is placed in the zone of convergence of the beams and the positions of the transparencies relative to the beams substantially correspond to their positions relative to the beams coming from the subject portion concerned during photographing; means for stereoscopically observing said reference mark and the projected images; first interceptor means in said stereoscopic observation means for periodically and alternately intercepting the projector beams; and second interceptor means in said stereoscopic observation means for alternately masking the fields of view of the eyes of an observer looking at the table in synchronism with said means for periodically and alternately intercepting the projector beams; wherein the improvement comprises: a color-sensitive surface situated on said table; and periodic masking means disposed adjacent said table operative to allow only the beam from one of said projectors to reach said color-sensitive surface whilst permitting constant simultaneous observation of said reference mark and of the images projected by the bEams from said two projectors.
Claim 3
Dependent Claim
70 words
Apparatus as claimed in claim 1, wherein the respective periods during which said first interceptor means intercept the beams from said two projectors are equal; said periodic masking means being such that, during a first period, it intercepts that beam which is not intercepted by said first interceptor means and, during a second period, it allows that beam not intercepted by said first interceptor means to reach said color-sensitive surface.
Claim 4
Dependent Claim
112 words
Apparatus as claimed in claim 1, wherein the periods during which a first beam from one of said projectors is intercepted by said first interceptor means are twice as long as the periods during which a second beam from the other of said projectors is intercepted; said masking means being such that, during a first period, it intercepts the first beam which is not intercepted by said first interceptor means, during a second period, it intercepts the second beam which is not intercepted by said first interceptor means and, during a third period, it allows the second beam which is not intercepted by said first interceptor means to reach the sensitive surface.
Claim 5
Dependent Claim
59 words
Apparatus as claimed in claim 2, further comprising: a movable screen arranged to cover said sensitive surface and formed with a slot which, for each subject portion projected, can be placed in the zone of convergence of said beams; and a reference mark near the slot on the front face of said screen which is directed toward the observer.
Claim 6
Dependent Claim
72 words
Apparatus as claimed in claim 4, wherein said periodic masking means comprises: a thin sheet having that face which is directed toward the observer of a color which enables the observer to see the images projected onto it; and means for reciprocating said sheet in a direction in a plane adjacent to the front face of said movable screen, so that said sheet periodically masks the slot without covering said reference mark.
Claim 7
Dependent Claim
93 words
Apparatus as claimed in claim 4, wherein said periodic masking means comprises: a rotatable shutter in the form of a close loop which passes through two parallel planes in the vicinity of the front face of said movable screen and which is provided with windows separated by opaque portions of a color which permits the observer to see the images projected thereon; means for rotating said shutter; a transparent plate suspended over said shutter; and a reference mark disposed on said transparent plate in the proximity of the slot in said movable screen.
Claim 8
Dependent Claim
107 words
Apparatus as claimed in claim 4, wherein said periodic masking means comprises: a rotatable disc having an opaque sector and a transparent sector and disposed adjacent the front face of said movable screen, the opaque sector being of a color such that the observer can see the images projected thereon; means for rotating said disc so that it sweeps over the slot in said movable screen; and a reference mark near the slot on the movable screen on that face of said disc which is directed towards the observer, said mark being in the form of a circle centered on the axis of rotation of said disc.
Claim 9
Dependent Claim
126 words
Apparatus as claimed in claim 3, further comprising: a movable screen arranged to cover said sensitive surface and formed with a slot which, for each subject portion projected, can be placed in the zone of convergence of said beams; and a reference mark near the slot on the front face of said screen which is directed towards the observer; and wherein said periodic masking means comprises: a thin sheet having that face which is directed towards the observer of a color which enables the observer to see the images projected onto it; and means for reciprocating said sheet in a direction in a plane adjacent to the front face of said movable screen, so that said sheet periodically masks the slot without covering said reference mark.
Claim 10
Dependent Claim
147 words
Apparatus as claimed in claim 3, further comprising: a movable screen arranged to cover said sensitive surface and formed with a slot which, for each subject portion projected, can be placed in the zone oF convergence of said beams; and a reference mark near the slot on the front face of said screen which is directed towards the observer; and wherein said periodic masking means comprises: a rotatable shutter in the form of a closed loop which passes through two parallel planes in the vicinity of the front face of said movable screen and which is provided with windows separated by opaque portions of a color which permits the observer to see the images projected thereon; means for rotating said shutter; a transparent plate suspended over said shutter; and a reference mark disposed on said transparent plate in the proximity of the slot in said movable screen.
Claim 11
Dependent Claim
150 words
Apparatus as claimed in claim 3, further comprising: a movable screen arranged to cover said sensitive surface and formed with a slot which, for each subject portion projected, can be placed in the zone of convergence of said beams; and a reference mark near the slot on the front face of said screen which is directed towards the observer; and wherein said periodic masking means comprises: a rotatable disc having an opaque sector and a transparent sector and disposed adjacent the front face of said movable screen, the opaque sector being of a color such that the observer can see the images projected thereon; means for rotating said disc so that it sweeps over the slot in said movable screen, on that face of said disc which is directed towards the observer, said mark being in the form of a circle centered on the axis of rotation of said disc.
References Cited (Backward Citations)
US3486820A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |