US3768899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple slide projector
Assignee: Empresa Nacional De Optica Sa es
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Filing: 1970-05-04
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Granted: 1973-10-30
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Expires: 1990-05-04
Abstract
Abstract A projector of multiple slides having a light-tight casing with a projector therein. A light source produces a light beam and a condenser system divides the light beam into a plurality of partial beams corresponding to the number of desired photograms. A slide carrier mounts a slide having a plurality of photograms or images. A shutter with means for activating the shutter manually or automatically interrupts the light beams coming from the photograms in a predetermined sequence. Multiple objectives are arranged to correspond to the photograms of the slides so that one objective corresponds to each photogram.
Inventors
- 👤 La Parra L De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:58
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/001
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
306 words
A multiple slide projector for producing animated sensations, superpositions and a mix dissolve of projected images, said projector comprising: a light source for projecting a main light beam; a condenser comprising first and second optical systems for forming a plurality of partial light beams, said first optical system comprising a plurality of lenses having the central optical axes thereof aligned, said second optical system comprising a plurality, corresponding to said plurality of partial light beams, of lens elements positioned in a plane transverse to the path of said light beams, said central optical axes of said plurality of lenses of said first optical system being parallel with the central axis of the optical axes of said lens elements of said second optical system, a slide carrier containing a plurality, equal to said plurality of lens elements, of slides having images, said carrier positioned such that each of said images aligns with the axis of one of said lens elements of said second optical system; a multiple objective comprising a plurality, equal to said plurality of lens elements, of objective lenses, the optical axis of each of said objective lenses aligning with the optical axis of one of said lens elements of said second optical system; a disc-shaped shutter having a sector removed therefrom positioned between said slide carrier and said multiple objective, the central axis of said disc being in alignment with the axis of said first optical system, the size of said sector relative to the total size of said disc-shaped shutter comprising the reciprocal of said plurality of lens elements; and means operatively connected to said shutter for selectively rotating said shutter in a plane transverse to the paths of said projected images to selectively allow said projected images to pass through said sector and to selectively obtain a mix dissolve of said images.
Claim 2
Dependent Claim
306 words
A multiple slide projector for producing animated sensations, superpositions and a mix dissolve of projected images, said projector comprising: a light source for projecting a main light beam; a condenser comprising first and second optical systems for forming a plurality of partial light beams, said first optical system comprising a plurality of lenses having the central optical axes thereof aligned, said second optical system comprising a plurality, corresponding to said plurality of partial light beams, of lens elements positioned in a plane transverse to the path of said light beams, said central optical axes of said plurality of lenses of said first optical system being parallel with the central axis of the optical axes of said lens elements of said second optical system, a slide carrier containing a plurality, equal to said plurality of lens elements, of slides having images, said carrier positioned such that each of said images aligns with the axis of one of said lens elements of said second optical system; a multiple objective comprising a plurality, equal to said plurality of lens elements, of objective lenses, the optical axis of each of said objective lenses aligning with the optical axis of one of said lens elements of said second optical system; a disc-shaped shutter having a sector removed therefrom positioned between said slide carrier and said multiple objective, the central axis of said disc being in alignment with the axis of said first optical system, the size of said sector relative to the total size of said disc-shaped shutter comprising the reciprocal of said plurality of lens elements; and means operatively connected to said shutter for selectively rotating said shutter in a plane transverse to the paths of said projected images to selectively allow said projected images to pass through said sector and to selectively obtain a mix dissolve of said images.
Claim 3
Dependent Claim
52 words
A projector as claimed in claim 1, wherein said lens elements of said second optical system each are circular with peripheral sections thereof removed to form straight edges, the straight edges of adjacent lens elements being flush, and the straight edges of each lens element forming an apex at said central axis.
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) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |