Patent US3603974A successfully refreshed from Google Patents.
US3603974A
Expired / Lapsed
US
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High speed photo-optical time recording
Assignee: National Aeronautics and Space Administration
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Filing: 1969-12-31
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Granted: 1971-09-07
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Expires: 1989-12-31
Abstract
Abstract An apparatus for placing a permanent time record on photographic film while being used in a high speed movie camera so as to indicate the exact time each frame of film is exposed. A coded source of timing pulses is fed into an electronic circuit that includes an electroluminescent diode that generates light signals corresponding to the timing pulses. These light signals are placed on the film in the camera.
Inventors
- 👤 Jesse T Copeland Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:55
CPC Classifications
G; G03; G03B; G03B39/00; G03B39/04; G03B15/00; G03B17/00; G03B17/24; G03B17/245; G03B2217/00; G03B2217/24; G03B2217/242; G03B2217/243; G03B2217/246; G03B2217/247
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
164 words
An apparatus for placing a permanent time record on photographic film while being used in a high speed movie camera so as to indicate the exact time each frame of the film is exposed comprising: A. A coded source of serial timing pulses having variable widths representing the time of a particular day, B. an electronic circuit provided for receiving and amplifying said timing pulses, C. an electroluminescent diode having a slit therein for emitting light therefrom when energized, D. said electroluminescent diode being interposed in said circuit for being serially energized by said timing pulses and generating pulses of light corresponding to said variable widths of said timing pulses, and E. said electroluminescent diode being carried in said movie camera closely adjacent the path of said film so that as said film runs in said camera, said electroluminescent diode emits pulses of light to expose a serial timing code represented by exposed film widths identical to said variable widths of said timing pulses.
Claim 2
Independent Claim
164 words
An apparatus for placing a permanent time record on photographic film while being used in a high speed movie camera so as to indicate the exact time each frame of the film is exposed comprising: A. A coded source of serial timing pulses having variable widths representing the time of a particular day, B. an electronic circuit provided for receiving and amplifying said timing pulses, C. an electroluminescent diode having a slit therein for emitting light therefrom when energized, D. said electroluminescent diode being interposed in said circuit for being serially energized by said timing pulses and generating pulses of light corresponding to said variable widths of said timing pulses, and E. said electroluminescent diode being carried in said movie camera closely adjacent the path of said film so that as said film runs in said camera, said electroluminescent diode emits pulses of light to expose a serial timing code represented by exposed film widths identical to said variable widths of said timing pulses.
Claim 3
Dependent Claim
30 words
The apparatus as set forth in claim 5, wherein said electroluminescent diode is mounted on a heat sink for aiding in dissipating heat generated during the operation of said diode.
Claim 4
Dependent Claim
54 words
The apparatus as set forth in claim 5, wherein said electronic circuit includes, A. a solid state three-stage switching amplifier, B. said timing pulses being coupled to an input of the first stage of said three-stage switching amplifier, and C. said electroluminescent diode being coupled to said third stage of said three-stage switching amplifier.
Claim 5
Dependent Claim
77 words
The apparatus as set forth in claim 3, wherein said third stage of said three stage switching amplifier includes, A. a power transistor having an emitter, collector, and base electrode, B. said electroluminescent diode being connected to a circuit containing said emitter and collector of said power transistor, and C. an RC network coupled to said circuit containing said emitter and collector electrodes for tuning said circuit to compensate for the inductive impedance of said electroluminescent diode.
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) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |