US3753613A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motion picture camera with adjustable shutter means
Assignee: Robert Bosch GmbH
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Filing: 1972-02-24
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Granted: 1973-08-21
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Expires: 1992-02-24
Abstract
Abstract A motion picture camera wherein a rotary shutter is movable between first and second angular positions in which its blade respectively overlies and is out of register with the lightadmitting aperture. An adjustable first pulse generator is provided to effect movements of the shutter from the first to the second position at preselected intervals to thereby start exposure with long exposure times. A second pulse generator is activated when the shutter assumes its second position and effects a movement of the shutter back to the first position with a delay which is a function of scene brightness but is invariably shorter than a preselected interval. The two pulse generators control a two-way switch which can cause an electromagnet to disengage an intercepting lever from the shutter whereby the lever starts the motor which rotates the shutter from the first to the second position when the switch is actuated by the first pulse generator and from the second to the first position when the switch is actuated by the second pulse generator.
Inventors
- 👤 W Schirmer
- 👤 H Reinsch
- 👤 G Kuhne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:06
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/08; G03B9/10; G03B21/00; G03B21/14; G03B21/32
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
141 words
In a motion picture camera for the making of exposures with relatively short exposure times of predetermined duration and longer exposure times of variable length, a combination comprising means defining a light-admitting aperture; a shutter having blade means and being movable between and beyond first and second positions in which said blade means respectively overlies and is out of register with said aperture; drive means for said shutter; first pulse generator means actuatable to effect movement of said shutter from said first to said second position at predetermined first intervals; and second pulse generator means actuatable to effect movements of said shutter from said second position back to said first position at variable second intervals each of which is shorter than one of said first intervals so that said shutter reassumes said first position prior to elapse of each first interval.
Claim 2
Dependent Claim
141 words
In a motion picture camera for the making of exposures with relatively short exposure times of predetermined duration and longer exposure times of variable length, a combination comprising means defining a light-admitting aperture; a shutter having blade means and being movable between and beyond first and second positions in which said blade means respectively overlies and is out of register with said aperture; drive means for said shutter; first pulse generator means actuatable to effect movement of said shutter from said first to said second position at predetermined first intervals; and second pulse generator means actuatable to effect movements of said shutter from said second position back to said first position at variable second intervals each of which is shorter than one of said first intervals so that said shutter reassumes said first position prior to elapse of each first interval.
Claim 3
Dependent Claim
23 words
A combination as defined in claim 1, further comprising means for actuating said first pulse generator means at the will of the user.
Claim 4
Dependent Claim
34 words
A combination as defined in claim 1, wherein said second pulse generator means includes exposure control means having photosensitive means for determining the length of said second intervAls as a function of scene brightness.
Claim 5
Dependent Claim
47 words
A combination as defined in claim 3, further comprising means for actuating said second pulse generator means in response to movement of said shutter to said second position so that each of said second intervals begins when said blade means is out of register with said aperture.
Claim 6
Dependent Claim
106 words
A combination as defined in claim 4, further comprising intercepting means movable between operative and inoperative positions in which a portion thereof respectively extends into and is withdrawn from the path of movement of a portion of said shutter so that the shutter is arrested in response to movement of said interceptiong means to said operative position and said drive means is free to move said shutter in response to movement of said interceptiong means to said inoperative position, said second pulse generator means further comprising means for effecting a movement of said intercepting means to said inoperative position after the elapse of said second intervals.
Claim 7
Dependent Claim
50 words
A combination as defined in claim 1, further comprising intercepting means movable to and from an operative position in which a portion thereof arrests said shutter to one of said first and second positions, and displacing means including electromagnet means energizable to move said intercepting means from said operative position.
Claim 8
Dependent Claim
32 words
A combination as defined in claim 6, wherein said first and second pulse generator means are respectively arranged to energize said electromagnet means after the elapse of said first and second intervals.
Claim 9
Dependent Claim
131 words
A combination as defined in claim 1, further comprising control means for respectively arresting said shutter in said second and first positions upon actuation of said first and second pulse generator means, said control means comprising multi-way switch means having a portion movable from a first to a second position to thereby complete a first circuit until said shutter reaches said second position, said portion of said switch means being further movable from said second to said first position to thereby complete a second circuit until said shutter reaches said first position, said first and second pulse generator means respectively comprising first and second moving means for respectively moving said portion of said switch means to said second and first positions after elapse of each of said first and second intervals.
Claim 10
Dependent Claim
31 words
A combination as defined in claim 8, wherein said circuits include common means for releasing said shutter to the action of said drive means in response to completion of either circuit.
Claim 11
Dependent Claim
19 words
A combination as defined in claim 1, further comprising adjustment means for varying the length of said first intervals.
Claim 12
Dependent Claim
28 words
A combination as defined in claim 1, further comprising means for starting said drive means in response to each actuation of said first and second pulse generator means.
Claim 13
Dependent Claim
42 words
A combination as defined in claim 1, further comprising means for arresting said drive means in response to completion of each movement of said shutter to said second and first positions thereof on actuation of said first and second pulse generator means.
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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |