US4589748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exposure control device for camera
Assignee: Fujifilm Holdings Corp
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Filing: 1985-06-25
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Granted: 1986-05-20
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Expires: 2005-06-25
Abstract
Abstract An exposure control device for use with a camera provided with two objective lenses having different focal length which are selectively used includes two exposure control elements which are disposed in front of and facing to the two objective lenses, respectively, and simultaneously driven by a drive means. One of the lights passed through the respective exposure control elements which is selected by optical path changing means is allowed to reach a film. The exposure control elements are used either diaphragms which usually allow the admittance of light into the objective lenses or shutters which are usually forced to be in positions where intercepting the optical paths of the objective lenses.
Inventors
- 👤 Hiroshi Ohmura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:42
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/08; G03B9/10; G03B9/14
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
227 words
In a camera having a first objective lens of a relatively long focal length, a second objective lens of a relatively short focal length, said first and second objective lenses being arranged side by side and having parallel optical axes, and means selectively to establish an optical path to a film through either of said first and second lenses; the improvement comprising: a shutter apparatus comprising a mounting plate having openings, said plate being disposed so that said openings are in alignment with the optical axes of said first and second lenses, respectively, a first shutter pivotally mounted on said plate, means displacing said first shutter between two positions wherein said first shutter respectively opens and closes a light path of the first lens; a second shutter pivotally mounted on said plate, means displacing said second shutter between two positions wherein said second shutter respectively opens and closes a light path of the second lens; and means simultaneously displacing said first and second shutters from said closed positions to said open positions, said simultaneous displacing means comprising a driving lever slidably movable in a direction perpendicular to the optical axes of said first and second objective lenses, said driving lever having projection arms which are adapted to abut said first and second shutters, respectively, and a spring urging said projection arms against said first and second shutters.
Claim 2
Dependent Claim
227 words
In a camera having a first objective lens of a relatively long focal length, a second objective lens of a relatively short focal length, said first and second objective lenses being arranged side by side and having parallel optical axes, and means selectively to establish an optical path to a film through either of said first and second lenses; the improvement comprising: a shutter apparatus comprising a mounting plate having openings, said plate being disposed so that said openings are in alignment with the optical axes of said first and second lenses, respectively, a first shutter pivotally mounted on said plate, means displacing said first shutter between two positions wherein said first shutter respectively opens and closes a light path of the first lens; a second shutter pivotally mounted on said plate, means displacing said second shutter between two positions wherein said second shutter respectively opens and closes a light path of the second lens; and means simultaneously displacing said first and second shutters from said closed positions to said open positions, said simultaneous displacing means comprising a driving lever slidably movable in a direction perpendicular to the optical axes of said first and second objective lenses, said driving lever having projection arms which are adapted to abut said first and second shutters, respectively, and a spring urging said projection arms against said first and second shutters.
Claim 3
Dependent Claim
18 words
An apparatus as defined in claim 1, wherein said first and second shutters are arranged side by side.
Claim 4
Dependent Claim
31 words
An apparatus as defined in claim 2, and means disposed on said mounting plate limiting the movement of said first and second shutters so as to set them to proper speeds.
Claim 5
Dependent Claim
27 words
An apparatus as defined in claim 1, and a spring individual to each said first and second shutter for urging its associated shutter toward said closed position.
Claim 6
Dependent Claim
50 words
An apparatus as defined in claim 1, wherein said simultaneous displacing means comprises a retaining lever engaging said driving lever at a position in which said driving lever spring is biased, and a release lever actuating said retaining lever so as to disengage said retaining lever from said driving lever.
Claim 7
Dependent Claim
53 words
An apparatus as defined in claim 4, wherein said limiting means has a first and a second projection, each of which is adapted to intercept said first and second shutters respectively, said first and second projections being displaceable within the range of movement of the said first and second shutters for time control.
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) | 1989-05-19 | 1989-11-18 | 1990-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-19 | 1993-11-18 | 1994-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-19 | 1997-11-18 | 1998-05-20 | $7700.00 | Window Closed / Lapsed |