US4231643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic film projection dissolve system for arc lamp projectors
Assignee: Bergen Expo Systems Inc
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Filing: 1979-03-30
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Granted: 1980-11-04
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Expires: 1999-03-30
Abstract
Abstract A photographic film projection system includes a plurality of projectors, one of which is an arc lamp projector, and a dissolver instrument whose controlled output power to the arc lamp projector is a phase controlled average a.c. power. The arc lamp projector has a light valve comprising a motor means linearly responsive to average power, for example, a moving iron galvanometer, and a movable means, such as a louvre, positioned between the arc lamp and the film gate.
Inventors
- 👤 Eugene Demick
- 👤 Adrian J. Van Haasteren, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:05
CPC Classifications
G; G03; G03B; G03B23/00; G03B23/18
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
187 words
A system for the projection of photographic film comprising: a plurality of photographic film projectors; a dissolver instrument connected to said projectors and to a source of a.c. power, said dissolver instrument including power control means to regulate by phase control its average output power to said projectors; at least one of said projectors having an arc lamp light source and a film gate and a light valve means positioned between said arc lamp and said film gate; said light valve means attenuating the arc lamp light reaching the film from zero to full intensity and changing such intensity at a controlled rate of speed, said light valve means comprising a motor means connected to said dissolver instrument, said motor means being a rotational motor having a servo feed back loop, the extent of rotation, as distinct from the speed of rotation, of said rotational motor being a function of said average output power, and movement means connected to said motor means and moved thereby at a controlled rate of speed to relatively open, closed and intermediate positions dependent upon the angular position of said rotor means.
Claim 2
Independent Claim
187 words
A system for the projection of photographic film comprising: a plurality of photographic film projectors; a dissolver instrument connected to said projectors and to a source of a.c. power, said dissolver instrument including power control means to regulate by phase control its average output power to said projectors; at least one of said projectors having an arc lamp light source and a film gate and a light valve means positioned between said arc lamp and said film gate; said light valve means attenuating the arc lamp light reaching the film from zero to full intensity and changing such intensity at a controlled rate of speed, said light valve means comprising a motor means connected to said dissolver instrument, said motor means being a rotational motor having a servo feed back loop, the extent of rotation, as distinct from the speed of rotation, of said rotational motor being a function of said average output power, and movement means connected to said motor means and moved thereby at a controlled rate of speed to relatively open, closed and intermediate positions dependent upon the angular position of said rotor means.
Claim 3
Dependent Claim
51 words
A system as in claim 1 wherein said movement means is a louvre comprising an operating bar connected to said rotor means and a parallel plurality of opaque slats which are pivotally linked to said operating bar and moved simultaneously to the same angle by the movement of said operating bar.
Claim 4
Dependent Claim
28 words
A system as in claim 1 wherein said movement means is an iris having overlapping opaque flat members and an external movement ring linked to said motor means.
Claim 5
Dependent Claim
15 words
A system as in claim 1 wherein said arc lamp is a xenon arc lamp.
Claim 6
Dependent Claim
18 words
A system as in claim 1 wherein said power control means includes a triac as its regulating device.
Claim 7
Dependent Claim
15 words
A system as in claim 1 wherein said movement means is a variable density filter.
Claim 8
Dependent Claim
158 words
A high lumen output photographic film slide projector adapted to be connected along with other slide projectors to a dissolver instrument, the output of said dissolver instrument being a phase control of average output power, said projector comprising: an arc lamp light source; a motor driven slide transport mechanism; a film gate in proximity to the slide in said transport mechanism to be projected; a light valve means comprising a motor means connected to said dissolver instrument, said motor means being a rotational motor having a servo feedback loop, the amount of rotation, as distinct from the speed of rotation, of said rotational motor being a function of said average output power, and a movement means connected to said motor means and positioned between said arc lamp and said film gate and moved by said motor means to relatively open, closed and intermediate positions to control the amount of light reaching the film gate from the arc lamp.
Claim 9
Dependent Claim
158 words
A high lumen output photographic film slide projector adapted to be connected along with other slide projectors to a dissolver instrument, the output of said dissolver instrument being a phase control of average output power, said projector comprising: an arc lamp light source; a motor driven slide transport mechanism; a film gate in proximity to the slide in said transport mechanism to be projected; a light valve means comprising a motor means connected to said dissolver instrument, said motor means being a rotational motor having a servo feedback loop, the amount of rotation, as distinct from the speed of rotation, of said rotational motor being a function of said average output power, and a movement means connected to said motor means and positioned between said arc lamp and said film gate and moved by said motor means to relatively open, closed and intermediate positions to control the amount of light reaching the film gate from the arc lamp.
Claim 10
Dependent Claim
54 words
A projector as in claim 7 wherein said movement means is a louvre comprising an operating bar connected to said rotor and a parallel plurality of opaque slats each of which is pivotally linked to said operating bar, said slats being moved simultaneously to the same angle by the movement of said operating bar.
Claim 11
Dependent Claim
26 words
A projector as in claim 7 wherein said movement means is an iris having overlapping opaque flat members and an external ring linked to said rotor.
Claim 12
Dependent Claim
15 words
A projector as in claim 7 wherein said arc lamp is a xenon arc lamp.
Claim 13
Dependent Claim
15 words
A projector as in claim 7 wherein said movement means is a variable density filter.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-04 | 1984-05-05 | 1984-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-04 | 1988-05-05 | 1988-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-04 | 1992-05-05 | 1992-11-04 | $7700.00 | Window Closed / Lapsed |