US3722989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control device for motor driven motion picture camera
Assignee: Minolta Co Ltd
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Filing: 1971-06-30
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Granted: 1973-03-27
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Expires: 1991-06-30
Abstract
Abstract A motion picture camera is provided with controls for selectively taking motion picture sequences or still shots. The exposure of the still shots may be selected by controlling the open period of the shutter. In this way bulb exposures may be made.
Inventors
- 👤 Y Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:00
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/08; G03B9/10; G03B21/00; G03B21/14; G03B21/32; G03B21/50
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
260 words
A control device for a motor driven motion picture camera having a drive motor, a shutter blade, and a shutter driving shaft driven by said motor, a combination comprising: a plate member secured to said driving shaft for rotating therewith and having first and second stoppers; a first stop lever being biased to engage with said first stopper and stop said driving shaft at the position where said shutter blade is closed; a second stop lever being biased to engage with said second stopper and stop said driving shaft at the position where said shutter blade is opened; electromagnetic means for disengaging said first stop lever from said first stopper and holding the first stop lever at a retired position; an intermediate member for allowing said second stop lever to engage said second stopper only when said first stop lever is at the retired position; an exposure selecting member settable to a first position for restraining said second stop lever at a retired position and a second position for allowing the operation of the second stop lever; a first energizing circuit for energizing said driving motor; a second energizing circuit for energizing the electromagnetic coils, including a first and a second switch connected in series with each other, said first switch being closed with the camera being operated and said second switch being closed for continuous shooting and for bulb exposure and opened for single frame shooting; and a third energizing circuit for energizing said electromagnetic coil for a short time, and connected in parallel with said second energizing circuit.
Claim 2
Dependent Claim
260 words
A control device for a motor driven motion picture camera having a drive motor, a shutter blade, and a shutter driving shaft driven by said motor, a combination comprising: a plate member secured to said driving shaft for rotating therewith and having first and second stoppers; a first stop lever being biased to engage with said first stopper and stop said driving shaft at the position where said shutter blade is closed; a second stop lever being biased to engage with said second stopper and stop said driving shaft at the position where said shutter blade is opened; electromagnetic means for disengaging said first stop lever from said first stopper and holding the first stop lever at a retired position; an intermediate member for allowing said second stop lever to engage said second stopper only when said first stop lever is at the retired position; an exposure selecting member settable to a first position for restraining said second stop lever at a retired position and a second position for allowing the operation of the second stop lever; a first energizing circuit for energizing said driving motor; a second energizing circuit for energizing the electromagnetic coils, including a first and a second switch connected in series with each other, said first switch being closed with the camera being operated and said second switch being closed for continuous shooting and for bulb exposure and opened for single frame shooting; and a third energizing circuit for energizing said electromagnetic coil for a short time, and connected in parallel with said second energizing circuit.
Claim 3
Dependent Claim
26 words
A control device as set forth in claim 1, wherein said third energizing circuit includes a capacitor, discharge current of which runs through said electromagnetic coil.
Claim 4
Dependent Claim
74 words
A control device as set forth in claim 2, wherein said first energizing circuit includes third and forth switches connected in series with each other, said third switch being adapted to be opened to open the first energizing circuit with said first stop lever engaging with said first stopper, and said fourth switch being adapted to be opened to open said first energizing circuit with said second stop lever engaging with said second stopper.
Claim 5
Dependent Claim
53 words
A control device as set forth in claim 3, wherein said electromagnetic means includes a first and a second electromagnetic coil connected in series with each other, said second energizing circuit being connected to both end terminals of the series connection of said coils, and said capacitor being connectable across the second coil.
Claim 6
Dependent Claim
55 words
A control device as set forth in claim 4, wherein said plate member is a disk having two notches as said stoppers formed on the periphery thereof, each of said stop levers being slidable on a side face of the disk with the associated switch closed until the associated lever engages with the appropriate notch.
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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |