US3765754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motion picture camera
Assignee: Agfa Gevaert AG
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Filing: 1972-07-25
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Granted: 1973-10-16
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Expires: 1992-07-25
Abstract
Abstract A motion picture camera which has light-admitting openings in the front and bottom walls of its housing. The front opening admits a main light beam which passes through spaced-apart front and rear portions of the picture taking lens. A mirrored rotary shutter can deflect incoming light into a viewfinder or against the photosensitive element of an exposure control. The bottom opening can admit an auxiliary light beam against a first mirror which is movable into and from the path of the main light beam, and a second mirror is mounted on the bottom wall for movement to and from an open position in which it directs the auxiliary light beam against the first mirror. The first mirror is moved into the path of the main light beam in response to movement of the second mirror to the open position. If the first mirror transmits a portion of the main light beam, the foremost film frame can be exposed to light entering by way of both openings when the second mirror assumes its open position.
Inventors
- 👤 A Winkler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:41
CPC Classifications
G; G03; G03B; G03B19/00; G03B19/18
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
175 words
In a photographic apparatus, particularly in a motion picture camera, a combination comprising a housing having first and second light-admitting openings; a first optical system including a picture taking lens registering with said first opening and having a front portion and a rear portion, said rear portion being disposed behind and being spaced apart from said front portion; guide means located behind said rear portion of said picture taking lens and arranged to guide photographic film so as to allow for the placing of successive film frames into register with said rear portion of said picture taking lens; and a second optical system including an optical element movable in said housing between first and second positions in one of which said optical element is located between said front and rear portions of said picture taking lens and deflects into said rear portion at least a part of light which is admitted by way of said second opening while simultaneously intercepting at least a part of light which is admitted by way of said first opening.
Claim 2
Dependent Claim
175 words
In a photographic apparatus, particularly in a motion picture camera, a combination comprising a housing having first and second light-admitting openings; a first optical system including a picture taking lens registering with said first opening and having a front portion and a rear portion, said rear portion being disposed behind and being spaced apart from said front portion; guide means located behind said rear portion of said picture taking lens and arranged to guide photographic film so as to allow for the placing of successive film frames into register with said rear portion of said picture taking lens; and a second optical system including an optical element movable in said housing between first and second positions in one of which said optical element is located between said front and rear portions of said picture taking lens and deflects into said rear portion at least a part of light which is admitted by way of said second opening while simultaneously intercepting at least a part of light which is admitted by way of said first opening.
Claim 3
Dependent Claim
24 words
A combination as defined in claim 1, wherein said optical element is a mirror which is pivotable between said first and second positions thereof.
Claim 4
Dependent Claim
24 words
A combination as defined in claim 1 wherein said optical element is a mirror which is reciprocable between said first and second positions thereof.
Claim 5
Dependent Claim
69 words
A combination as defined in claim 1 wherein said optical element is a partly light-reflecting mirror which in said one position thereof deflects against said rear portion a first part of light entering by way of said second opening and transmits a second part of such light, and further comprising viewfinder means positioned in said housing to receive at least one of said first and second parts of light.
Claim 6
Dependent Claim
73 words
A combination as defined in claim 1, further comprising viewfinder means mounted in said housing and deflecting means for directing light entering by way of said first opening into said viewfinder means, said deflecting means being disposed in said housing between said front and rear portions of said picture taking lens, said optical element being located in said one position thereof between said deflecting means and one portion of said picture taking lens.
Claim 7
Dependent Claim
23 words
A combination as defined in claim 5, further comprising diaphragm means provided in said housing between said portions of said picture taking lens.
Claim 8
Dependent Claim
45 words
A combination as defined in claim 5, wherein said deflecting means comprises a mirror which is movable into and out of the path of light entering said housing by way of said second opening and being deflected by said optical element toward said rear portion.
Claim 9
Dependent Claim
16 words
A combination as defined in claim 5, wherein said deflecting means constitutes an optical correcting means.
Claim 10
Dependent Claim
62 words
A combination as defined in claim 1, wherein said second optical system further comprises a mirror outwardly adjacent to said second opening and movable between a first position in which said mirror directs light against said optical element by way of said second opening and a second position in which said mirror prevents entry of light by way of said second opening.
Claim 11
Dependent Claim
32 words
A combination as defined in claim 9, further comprising motion transmitting means for moving said optical element to said one position in response to movement of said mirror to said first position.
Claim 12
Dependent Claim
18 words
A combination as defined in claim 1, further comprising a flat light-transmitting plate provided in said second opening.
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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |