US4097134A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Projection device
Assignee: Individual
•
Filing: 1976-02-24
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Granted: 1978-06-27
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Expires: 1996-02-24
Abstract
Abstract A projection device provided with at least two different enlarging projection systems for the projection on a screen of a set of at least two slides provided on one carrier, said slides covering the same area of a plan or map, one slide being more detailed than the other. The device projects the first less detailed slide entirely and the second or next, more detailed slide only in part but on a larger scale. The device comprises further a transparent runner indicating on the first slide the part of the next slide that is projected.
Inventors
- 👤 Hans G. Jerie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:31
CPC Classifications
G; G09; G09B; G09B29/00; G09B29/10; G09B29/102; G09B29/104; G03; G03B; G03B21/00; G03B21/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
237 words
A projection device comprising: a projection screen presenting a surface defining an image projection area; means defining a first area to be occupied by a first diapositive carrying a pictorial representation of a given subject; a first optical system arranged to project an image of the entirety of the first area onto said screen in a manner such that the image fills substantially the entire image projection area; means defining a second area to be occupied by a second diapositive carrying a pictorial representation of the same subject, and to the same scale, as the first diapositive; a second optical system producing a greater magnification than said first optical system and arranged to project an image of a portion constituting a fractional part of the second area onto said screen in a manner such that the image of such portion fills substantially the entire image projection area; and a transparent runner movable parallel to the first and second areas and provided with a window located adjacent the first area and corresponding in size to a portion of the first area, said runner carrying at least part of said second optical system at a location relative to said window such that the location of the portion of the first area which is adjacent said window corresponds to the location of the portion of said second area which said second optical system is arranged to project on said screen.
Claim 2
Dependent Claim
237 words
A projection device comprising: a projection screen presenting a surface defining an image projection area; means defining a first area to be occupied by a first diapositive carrying a pictorial representation of a given subject; a first optical system arranged to project an image of the entirety of the first area onto said screen in a manner such that the image fills substantially the entire image projection area; means defining a second area to be occupied by a second diapositive carrying a pictorial representation of the same subject, and to the same scale, as the first diapositive; a second optical system producing a greater magnification than said first optical system and arranged to project an image of a portion constituting a fractional part of the second area onto said screen in a manner such that the image of such portion fills substantially the entire image projection area; and a transparent runner movable parallel to the first and second areas and provided with a window located adjacent the first area and corresponding in size to a portion of the first area, said runner carrying at least part of said second optical system at a location relative to said window such that the location of the portion of the first area which is adjacent said window corresponds to the location of the portion of said second area which said second optical system is arranged to project on said screen.
Claim 3
Dependent Claim
96 words
An arrangement as defined in claim 1 wherein both of said optical systems are arranged in a manner such that their main axes intersect at the projection screen surface and so that the image of the entire first area and the image of the portion of the second area can be projected onto the same location of the projection screen, and each of said optical systems comprises a respective, individually controllable light source for enabling a selected one of the images to be projected onto said projection screen by switching on one of said light sources.
Claim 4
Dependent Claim
35 words
An arrangement as defined in claim 1 wherein the projection of the image of the portion of said second area is of substantially the same size as that of the image of said first area.
Claim 5
Dependent Claim
59 words
An arrangement as defined in claim 1 wherein said runner is arranged for movement in two mutually transverse directions parallel to said first area, said window is provided with a visible mark, and the projected image of the portion of said second area corresponds to the region surrounding the point of the first area which coincides with the mark.
Claim 6
Dependent Claim
39 words
An arrangement as defined in claim 1 wherein at least one of said optical systems comprises light reflecting means for reflecting light rays in the optical path between the area associated with said optical system and said projection screen.
Claim 7
Dependent Claim
26 words
An arrangement as defined in claim 5 wherein said reflecting means are associated with said second optical system and provide an even number of reflecting surfaces.
Claim 8
Dependent Claim
63 words
An arrangement as defined in claim 1 wherein said means defining a first area and said means defining a second area together comprise a carrier for holding two diapositives each bearing a pictorial representation of the same scene, but with the second diapositive of the pair carrying a representation containing a greater amount of picture detail than the first diapositive of the pair.
Claim 9
Dependent Claim
110 words
An arrangement as defined in claim 1 further comprising means defining at least one further area to be occupied by at least one further diapositive carrying a pictorial representation of the given subject, and at least one further optical system arranged to project an image of a portion of a respective further area onto said screen in a manner such that the image of such portion fills substantially the entire image projection area with each one of the first, second and further diapositives carrying a progressively more detailed representation of the given subject and each of said first, second and further optical systems producing progressively greater degrees of subject magnifications.
References Cited (Backward Citations)
US2130562A
Cited
US2558999A
Cited
CH361415A
Cited
FR1213251A
Cited
US3045541A
Cited
US3319517A
Cited
US3674350A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-26 | 1981-12-26 | 1982-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-26 | 1985-12-26 | 1986-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-26 | 1989-12-26 | 1990-06-27 | $7700.00 | Window Closed / Lapsed |