US3746438A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cine-camera with simultaneous optical sound-recording device
Assignee: KOHKA KK
•
Filing: 1971-08-30
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Granted: 1973-07-17
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Expires: 1991-08-30
Abstract
Abstract In a compact cine-camera with a simultaneous optical soundrecording device, there are provided means for producing a loop locally in the length of a motion picture film and for maintaining the loop at a constant length; means for stabilizing the travel speed of that portion of the loop of film that has passed the film exposing means; an optical sound-recording head with a luminescent diode facing the said stabilizer; and an amplifier means for altering the intensity of the luminance of the diode in accordance with the intensity of the signal of sound to be recorded. The luminant outputs of the diode are projected onto the film strips as they pass the stabilizer to form a sound track on the film. Thus, optical sound-recording is effected on the film simultaneously with the exposure of the film by a compact cine-camera having a simple structure which can be manufactured in a large number at a low cost without requiring any additional complicated equipment.
Inventors
- 👤 M Misawa
- 👤 I Kato
- 👤 Y Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:49
CPC Classifications
G; G03; G03B; G03B31/00; G03B31/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
205 words
A cartridge type cine-camera with an optical simultaneous sound-recording device comprising: a camera housing having a compartment for receiving a film cartridge, driving means mounted on said housing for rotating at least one film reel of said cartridge; film feeding means comprising a film drawing-out sprocket and a film taking-in sprocket, said two sprockets being arranged adjacent said cartridge and being driven coercively for feeding the film wound around the said reel and for forming a loop of the said film and means for maintaining the length of the said loop constant; film exposing means provided within the said loop and including a lens system for focusing the image of the object to be photographed onto the film, a sector vane, a film feeding pawl and a film pressing plate; film speed stabilizing means provided within the said loop for feeding at a constant speed that portion of the film which has passed the film exposing means; optical sound-recording head means having a luminescent diode serving as a luminescing source, and facing the said film speed stabilizing means, and amplifier means for the said diode for controlling the luminance of the said diode in accordance with the sound signal current applied to the amplifier means.
Claim 2
Dependent Claim
205 words
A cartridge type cine-camera with an optical simultaneous sound-recording device comprising: a camera housing having a compartment for receiving a film cartridge, driving means mounted on said housing for rotating at least one film reel of said cartridge; film feeding means comprising a film drawing-out sprocket and a film taking-in sprocket, said two sprockets being arranged adjacent said cartridge and being driven coercively for feeding the film wound around the said reel and for forming a loop of the said film and means for maintaining the length of the said loop constant; film exposing means provided within the said loop and including a lens system for focusing the image of the object to be photographed onto the film, a sector vane, a film feeding pawl and a film pressing plate; film speed stabilizing means provided within the said loop for feeding at a constant speed that portion of the film which has passed the film exposing means; optical sound-recording head means having a luminescent diode serving as a luminescing source, and facing the said film speed stabilizing means, and amplifier means for the said diode for controlling the luminance of the said diode in accordance with the sound signal current applied to the amplifier means.
Claim 3
Dependent Claim
228 words
A cine-camera according to claim 1, in which the said film speed stabilizing means comprises a stabilizing roller which is given a sufficient inertia by a fly wheel, a rotatable control lever adapted to be rendered to a fIrst position and a second position, a guide roller for applying the film sufficiently onto the said film speed stabilizing roller in the said first position of the said control lever, a film guide roller positioned above the said control lever for being positioned close to both of the said two sprockets whenever the said control lever is in its first position, a tension roller for applying a tension to the film in the first position of the said control lever, a lever having at one end thereof a capstan roller adapted to be brought into pressure contact with the said film speed stabilizing roller in the first position of the said control lever, and a holder engaged by the said lever and having a film pressing plate intended for positioning the film at a focusing point of the lens system in the first position of the said control lever, whereby in the second position of the said control lever, the guide roller, the capstan roller, the tension roller and the said pressing plate are released from their cocked state to facilitate the loading of the film on the camera.
Claim 4
Dependent Claim
106 words
A cine-camera according to claim 1, in which the camera further comprises means for releasing the film pressing plate of the said film cartridge, said means comprising a window formed through a partition wall constituting said film-cartridge compartment and arranged to be aligned with the opening of the said cartridge when the latter is loaded on the camera, and pawls extending from the said window of the partition wall towards the opening of the said cartridge loaded within the said compartment, whereby the said film pressing plate of the cartridge is pushed by the said pawls at the time the cartridge is loaded on the camera.
Claim 5
Dependent Claim
108 words
A cine-camera according to claim 1, in which one of the said two sprockets comprises a sprocket wheel engaged by a pin fixed to a base plate of the camera, a sleeve mounted on the said pin in adjacent alignment with the said sprocket wheel, a clutch means mounted on the said sleeve and having two members, a coil spring applied between one of the said clutch members and the said sprocket wheel, a stopper for limiting the movement of the other of the clutch members on the said sleeve, and pawls formed on the respective clutch members so as to mesh with each other to rotate unidirectionally.
Claim 6
Dependent Claim
65 words
A cine-camera according to claim 1, in which the said amplifier for driving the said luminescent diode to perform optical sound-recording has a driving circuit comprising a load resistor connected in series to the said luminescent diode, a DC power source connected to both the said diode and the said load resistor, and a capacitor for applying AC input signal current to the said diode.
Claim 7
Dependent Claim
147 words
A cine-camera according to claim 1, in which the said optical sound-recording head means comprises a cylindrical body, a luminescent diode fixed to one end of the said body in such a way that its luminescing face is directed to face the said stabilizing roller, a first mask having a narrow slit and being provided in the immediate foreground of the said diode, a lens system fixed at a predetermined position within the said body for focusing the image of light of said diode onto the film located on the said stabilizing roller, and a second mask provided at that end of the body located farther from the said one end to which the diode is fixed, said first mask serving to limit the breadth of the said image of light of the diode and said second mask serving to limit the lingitudinal dimension of this image.
Claim 8
Dependent Claim
132 words
A cine-camera according to claim 1, in which the said optical sound-recording head means comprises a cylindrical casing, a luminescent diode fixed to one end of the said casing in such a way that its luminescing face is directed to face the said stabilizing roller, a mask having a sufficiently narrow slit and being positioned in the immediate foreground of the diode, and at least two lenses for focusing the image of the luminescent region of the diode onto the film, the said lenses being of radii and thIcknesses which, respectively are different from each other and being positioned to cross each other, whereby one of the lenses serving to limit the breadth of the said image, while the other of the lenses serving to limit the longitudinal dimension of this image.
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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) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |