Patent US3632194A successfully refreshed from Google Patents.
US3632194A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motion picture projector
Assignee: Singer General Precision Inc
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Filing: 1969-12-29
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Granted: 1972-01-04
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Expires: 1989-12-29
Abstract
Abstract Variable speed flickerless motion picture projectors have many uses. This invention comprises a variable speed flickerless motion picture projector which uses a stepping motor to drive the film and a pulsed light source instead of a mechanical shutter and fixed light source. A computer or other programmed system controls the operation of the motor and light source.
Inventors
- 👤 Walter E Myles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:13
CPC Classifications
G; G03; G03B; G03B41/00; G03B41/02; G03B41/14
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
132 words
A variable speed motion picture projector system comprising a film gate adapted to contain a strip of motion picture film for intermittent movement therethrough, means for feeding said film strip to said gate and for retrieving it from said gate, a controllable intermittent source of light, said source emitting light when it is energized, means for intermittently energizing said source of light under the control of an external means, a stepping motor connected to said film feed to drive said film feed when said motor is energized, means for intermittently energizing said motor to move said film through said gate at selectable speeds one frame at a time, and means for controlling the energization of said source of light to energize said source only when said film is stationary in said gate.
Claim 2
Dependent Claim
132 words
A variable speed motion picture projector system comprising a film gate adapted to contain a strip of motion picture film for intermittent movement therethrough, means for feeding said film strip to said gate and for retrieving it from said gate, a controllable intermittent source of light, said source emitting light when it is energized, means for intermittently energizing said source of light under the control of an external means, a stepping motor connected to said film feed to drive said film feed when said motor is energized, means for intermittently energizing said motor to move said film through said gate at selectable speeds one frame at a time, and means for controlling the energization of said source of light to energize said source only when said film is stationary in said gate.
Claim 3
Dependent Claim
75 words
The projector system defined in claim 1 wherein the speed of said motor is controlled by the rate at which said motor is energized, said means for energizing said motor applying pulses to said motor to produce operation thereof, and means for controlling the rate at which said motor energization means applies pulses to said motor to control the speed of operation thereof and the speed at which the film is moved through the gate.
Claim 4
Dependent Claim
127 words
A variable speed motion Picture projector system which compensates for differences in speed by controlling the energization of its projection light, said system comprising a film gate through which motion picture film is adapted to be moved, a film transport means including a pulsed intermittently operating motor first means for applying energization pulses to said motor, a pulsed source of light, second means for applying energization pulses to said source of light, and means for controlling the timing and the rate at which said first and second means apply energization pulses to said motor and said source of light to control the speed of movement of said film through said gate and the time interval during which any frame of said film is illuminated from said source.
Claim 5
Dependent Claim
127 words
A variable speed motion Picture projector system which compensates for differences in speed by controlling the energization of its projection light, said system comprising a film gate through which motion picture film is adapted to be moved, a film transport means including a pulsed intermittently operating motor first means for applying energization pulses to said motor, a pulsed source of light, second means for applying energization pulses to said source of light, and means for controlling the timing and the rate at which said first and second means apply energization pulses to said motor and said source of light to control the speed of movement of said film through said gate and the time interval during which any frame of said film is illuminated from said source.
Claim 6
Dependent Claim
36 words
The system defined in claim 3 wherein the speed of movement of said film through said gate-the frame rate-is proportional to the rate at which energization pulses are applied to said motor by said first means.
Claim 7
Dependent Claim
91 words
The system defined in claim 4 wherein the rate at which said film is illuminated is controlled by the rate at which said second means applies pulses to said source of light, and wherein the amount of light by which each frame of said film is illuminated is controlled by the length of time that said source is energized each time it is energized, the rate of energization of said source being at least sufficient to ensure that the operation of said projector appear to the human eye to be flickerless.
Claim 8
Dependent Claim
64 words
The projector defined in claim 4 wherein said control means further determines the time duration and rate at which pulses are applied by said second means to said source of light, and wherein said control means synchronizes the movement of the film which the energization of said source of light throughout the range of speeds at which said film is driven through said gate.
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) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |