US3741636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motion picture projecting device which automatically changes the projection speed
Assignee: Fujifilm Holdings Corp
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Filing: 1971-03-03
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Granted: 1973-06-26
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Expires: 1991-03-03
Abstract
Abstract A motion picture projecting device having a means for sensing film projecting speed signals recorded on the film strip or on a separate magnetic recording tape and including a speed control means for automatically controlling the projection speed in response to the sensed speed signals to enable a reduced length of film per unit time to be used for more efficient use of the film.
Inventors
- 👤 Y Nakayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:04
CPC Classifications
G; G03; G03B; G03B19/00; G03B19/18; G03D; G03D15/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
99 words
A motion picture projecting device comprising means for detecting speed signals contained on a signal track provided on a film to be projected and projection speed control means operatively connected to said detecting means for automatically controlling the projection speed in response to the detected signals, wherein said speed signals comprise a plurality of pulse signals and said speed control means includes a standard pulse generating means and a pulse comparing means for comparing the standard pulses generated by said standard pulse generating means with the pulse signals detected by said detecting means to control the speed of projection.
Claim 2
Dependent Claim
99 words
A motion picture projecting device comprising means for detecting speed signals contained on a signal track provided on a film to be projected and projection speed control means operatively connected to said detecting means for automatically controlling the projection speed in response to the detected signals, wherein said speed signals comprise a plurality of pulse signals and said speed control means includes a standard pulse generating means and a pulse comparing means for comparing the standard pulses generated by said standard pulse generating means with the pulse signals detected by said detecting means to control the speed of projection.
Claim 3
Dependent Claim
29 words
A motion picture projecting device as claimed in claim 1 wherein said standard pulse generating means comprises a tape reproducing device for reproducing signals recorded on a recording tape.
Claim 4
Dependent Claim
127 words
A motion picture device comprising means for detecting speed signals contained on a signal track provided on a film to be projected and projection speed control means operatively connected to said detecting means for automatically controlling the projection speed in response to the detected signals, wherein said signal track comprises two parts, one part being a non-signal generating portion and the other part being a signal generating portion, whereby the speed of projection is changed into two speeds by detecting said two parts of said signal track. 4. A motion picture projecting device as defined in claim 3 wherein said detecting means is operatively connected with a solenoid, said solenoid being mechanically connected with a lever for operating a slow motion projection control on said projecting device.
Claim 5
Dependent Claim
29 words
A motion picture projecting devIce as defined in claim 1 wherein said pulse comparing means comprises a flip-flop circuit for receiving both said standard pulses and said pulse signals.
References Cited (Backward Citations)
US2349941A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |