US3782811A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filmstrip projector with synchronized sound
Assignee: Bell and Howell Co
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Filing: 1972-01-13
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Granted: 1974-01-01
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Expires: 1992-01-13
Abstract
Abstract A control apparatus for a film strip projector provided with synchronized audio accompaniment. A recorder having a control track provides actuation signals for control of the projector motor. In response to a control signal from the recorder control track the projector motor is actuated and maintained energized through an operational movement corresponding to the advance of one film frame after which it is deactivated in ancicipation of a subsequent control signal.
Inventors
- 👤 F Badalich
- 👤 R Watterlohn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:09
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/14; G03B21/32; G03B21/43; G03B23/00; G03B23/08; G03B23/12; G03B31/00; G03B31/04; G03B31/06; G03B35/00; G03B35/18; G03B35/24
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
115 words
In combination with a filmstrip projector including a light source, a power source, a motor driving a filmstrip and means for projecting an image provided by the filmstrip at a projection screen the improvement comprising: a recorder having a control track providing a control signal for the actuation of said motor; means for starting said motor in response to said control signal; switch means coupled to said motor for maintaining said motor operational through a predetermined movement corresponding to the advance of one film frame; and an oscillator coupled to the recording head and to said starting means for recording a control signal in the audio track of the recorder and simultaneously advancing said film.
Claim 2
Dependent Claim
115 words
In combination with a filmstrip projector including a light source, a power source, a motor driving a filmstrip and means for projecting an image provided by the filmstrip at a projection screen the improvement comprising: a recorder having a control track providing a control signal for the actuation of said motor; means for starting said motor in response to said control signal; switch means coupled to said motor for maintaining said motor operational through a predetermined movement corresponding to the advance of one film frame; and an oscillator coupled to the recording head and to said starting means for recording a control signal in the audio track of the recorder and simultaneously advancing said film.
Claim 3
Dependent Claim
35 words
The apparatus of claim 1 which further includes a multi-vibrator connected to said oscillator for control thereof so that upon activation of said multi-vibrator said oscillator will be turned on for a predetermined time period.
Claim 4
Dependent Claim
114 words
In combination with a filmstrip projector including a light source, a power source, a motor driving a filmstrip and means for projecting an image provided by the filmstrip at a projection screen the improvement comprising: a recorder having a control track providing a control signal for the actuation of said motor; a first switch means for actuating said motor in response to said control signal wherein said motor is initially actuated through a movement less than a predetermined movement; and a second switch means coupled to said motor and responsive to said initial actuation of said motor for maintaining said motor operational and enabling the continuing actuation of said motor through said predetermined movement.
Claim 5
Dependent Claim
114 words
In combination with a filmstrip projector including a light source, a power source, a motor driving a filmstrip and means for projecting an image provided by the filmstrip at a projection screen the improvement comprising: a recorder having a control track providing a control signal for the actuation of said motor; a first switch means for actuating said motor in response to said control signal wherein said motor is initially actuated through a movement less than a predetermined movement; and a second switch means coupled to said motor and responsive to said initial actuation of said motor for maintaining said motor operational and enabling the continuing actuation of said motor through said predetermined movement.
Claim 6
Dependent Claim
52 words
The apparatus of claim 3 wherein said first switch means comprises: a relay coil energizable in response to said control signal; and a first normally open switch wheRein said first switch is closed only when said relay coil is energized and wherein said motor is actuated when said first switch is closed.
Claim 7
Dependent Claim
47 words
The apparatus of claim 4 wherein said second switch means comprises: a second normally open switch connected in parallel with said first switch; and a cam means coupled to said motor for closing said second switch and for maintaining said second switch closed for a predetermined time.
Claim 8
Dependent Claim
24 words
The apparatus of claim 3 wherein said starting means includes a noise filter for removing spurious responses produced by said transducer head during playback.
Claim 9
Dependent Claim
29 words
The apparatus of claim 6 wherein said starting means includes a pulse former receiving said control signals and providing an output pulse in response thereto having a predetermined shape.
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) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |