US4415248A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exposure control apparatus
Assignee: Canon Inc
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Filing: 1982-06-09
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Granted: 1983-11-15
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Expires: 2002-06-09
Abstract
Abstract An exposure control apparatus including an electrically operated optical diaphragm. The apparatus is provided with means for detecting a quantity of light coming from an object to be photographed during an exposure control cycle thereof. The detecting means is connected to the electrically operated optical diaphragm device in accordance with an output signal of the detecting means during the exposure control cycle.
Inventors
- 👤 Ryoichi Suzuki
- 👤 Takashi Uchiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:36
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/08; G03B7/081; G03B7/085; G03B7/091; G03B7/095
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
137 words
An exposure control apparatus for a photographic camera having a shutter and an electrically operated optical diaphragm arranged to have the aperture thereof controlled, said apparatus comprising: light measuring means which is arranged to produce, during each exposure control cycle of the camera, an electrical signal corresponding to the brightness of an object to be photographed and instantaneously varying in accordance with the variations of the brightness of the object to be photographed during each exposure control cycle of the camera; and control means coupled to the light measuring means and to said electrically operated optical diaphragm, said control means arranged to instantaneously make the aperture smaller when a light level of an object becomes brighter during an exposure control cycle of the camera and to instantaneously make the aperture larger when the light level becomes darker.
Claim 2
Dependent Claim
137 words
An exposure control apparatus for a photographic camera having a shutter and an electrically operated optical diaphragm arranged to have the aperture thereof controlled, said apparatus comprising: light measuring means which is arranged to produce, during each exposure control cycle of the camera, an electrical signal corresponding to the brightness of an object to be photographed and instantaneously varying in accordance with the variations of the brightness of the object to be photographed during each exposure control cycle of the camera; and control means coupled to the light measuring means and to said electrically operated optical diaphragm, said control means arranged to instantaneously make the aperture smaller when a light level of an object becomes brighter during an exposure control cycle of the camera and to instantaneously make the aperture larger when the light level becomes darker.
Claim 3
Dependent Claim
19 words
An exposure control apparatus according to claim 1, wherein said electrically operated optical diaphragm is formed with transparent ceramic.
Claim 4
Dependent Claim
47 words
An exposure control apparatus according to claim 2, wherein said control means includes means for supplying said transparent ceramic with a voltage of a level corresponding to the electrical signal from the light measuring means for the purpose of varying the light transmissivity of the transparent ceramic.
Claim 5
Dependent Claim
151 words
An exposure control apparatus for an automatic exposure control camera with a shutter speed priority having a shutter and an electrically operated optical diaphragm arranged to have the aperture thereof controlled, said apparatus comprising: light measuring means which is arranged to produce, during each exposure control cycle of the camera, an electrical signal corresponding to the brightness of an object to be photographed, said electrical signal instantaneously varying in accordance with the variations of the brightness of the object to be photographed during each exposure cycle of the camera; and control means coupled to the light measuring means and to said electrically operated optical diaphragm, said control means being arranged to make the aperture of the electrically operated optical diaphragm instantaneously smaller when a light level of the object becomes brighter during an exposure cycle of the camera and to make the aperture instantaneously larger when the light level becomes darker.
Claim 6
Dependent Claim
151 words
An exposure control apparatus for an automatic exposure control camera with a shutter speed priority having a shutter and an electrically operated optical diaphragm arranged to have the aperture thereof controlled, said apparatus comprising: light measuring means which is arranged to produce, during each exposure control cycle of the camera, an electrical signal corresponding to the brightness of an object to be photographed, said electrical signal instantaneously varying in accordance with the variations of the brightness of the object to be photographed during each exposure cycle of the camera; and control means coupled to the light measuring means and to said electrically operated optical diaphragm, said control means being arranged to make the aperture of the electrically operated optical diaphragm instantaneously smaller when a light level of the object becomes brighter during an exposure cycle of the camera and to make the aperture instantaneously larger when the light level becomes darker.
Claim 7
Dependent Claim
19 words
An exposure control apparatus according to claim 4, wherein said electrically operated optical diaphragm is formed with transparent ceramic.
Claim 8
Dependent Claim
47 words
An exposure control apparatus according to claim 5, wherein said control means includes means for supplying said transparent ceramic with a voltage of a level corresponding to the electrical signal from the light emitting means for the purpose of varying the light transmissivity of the transparent ceramic.
Claim 9
Dependent Claim
146 words
An exposure control apparatus for a programmed type camera having a shutter and an electrically operated optical diaphragm arranged to have the aperture thereof controlled, said apparatus comprising: light measuring means which is arranged to produce, during each exposure control cycle of the camera, an electrical signal corresponding to the brightness of an object to be photographed, said electrical signal instantaneously varying in accordance with the variations of the brightness of the object to be photographed during each exposure cycle of the camera; and control means coupled to the light measuring means and to said electrically operated optical diaphragm, said control means being arrayed to make the aperture of said electrically operated optical diaphragm instantaneously smaller when a light level of the object becomes darker during an exposure control cycle of the camera, and to make the aperture larger instantaneously when the light level becomes darker.
Claim 10
Dependent Claim
146 words
An exposure control apparatus for a programmed type camera having a shutter and an electrically operated optical diaphragm arranged to have the aperture thereof controlled, said apparatus comprising: light measuring means which is arranged to produce, during each exposure control cycle of the camera, an electrical signal corresponding to the brightness of an object to be photographed, said electrical signal instantaneously varying in accordance with the variations of the brightness of the object to be photographed during each exposure cycle of the camera; and control means coupled to the light measuring means and to said electrically operated optical diaphragm, said control means being arrayed to make the aperture of said electrically operated optical diaphragm instantaneously smaller when a light level of the object becomes darker during an exposure control cycle of the camera, and to make the aperture larger instantaneously when the light level becomes darker.
Claim 11
Dependent Claim
160 words
An exposure control apparatus for an automatic control type exposure camera with a shutter speed priority having a shutter and an electrically operated optical diaphragm arranged to have the aperture thereof controlled, said apparatus comprising: light measuring means which produces, during each exposure control cycle of the camera, and electrical signal corresponding to the quantity of light which comes from an object to be photographed and passes through said electrically operated diaphragm, said electrical signal instantaneously varying in accordance with the variations of brightness of the object to be photographed during each exposure control cycle of the camera; and control means coupled to the light measuring means and to said electrically operated optical diaphragm, said control means being arranged to make the aperture of said electrically operated optical diaphragm instantaneously smaller when a light level of the object becomes brighter during an exposure cycle of the camera and to make the aperture instantaneously larger when the light level becomes darker.
Claim 12
Dependent Claim
160 words
An exposure control apparatus for an automatic control type exposure camera with a shutter speed priority having a shutter and an electrically operated optical diaphragm arranged to have the aperture thereof controlled, said apparatus comprising: light measuring means which produces, during each exposure control cycle of the camera, and electrical signal corresponding to the quantity of light which comes from an object to be photographed and passes through said electrically operated diaphragm, said electrical signal instantaneously varying in accordance with the variations of brightness of the object to be photographed during each exposure control cycle of the camera; and control means coupled to the light measuring means and to said electrically operated optical diaphragm, said control means being arranged to make the aperture of said electrically operated optical diaphragm instantaneously smaller when a light level of the object becomes brighter during an exposure cycle of the camera and to make the aperture instantaneously larger when the light level becomes darker.
Claim 13
Dependent Claim
158 words
An exposure control apparatus for a photographic camera having a shutter and an electrically operated optical diaphragm arranged to have the aperture thereof controlled, said apparatus comprising: light measuring means which is arranged to receive, during each exposure control cycle of the camera, a reflected light from the film to be exposed and to produce instantaneously an electrical signal corresponding to the brightness of an object to be photographed, said electrical signal instantaneously varying in accordance with the variations of brightness of the object to be photographed during each exposure control cycle of the camera; and control means coupled to the light measuring means and to said electrically operated optical diaphragm, said control means being arranged to make the aperture of said electrically operated optical diaphragm instantaneously smaller when a light level of the object becomes brighter during an exposure control cycle of the camera and to make the aperture instantaneously larger when the light level becomes darker.
Claim 14
Dependent Claim
158 words
An exposure control apparatus for a photographic camera having a shutter and an electrically operated optical diaphragm arranged to have the aperture thereof controlled, said apparatus comprising: light measuring means which is arranged to receive, during each exposure control cycle of the camera, a reflected light from the film to be exposed and to produce instantaneously an electrical signal corresponding to the brightness of an object to be photographed, said electrical signal instantaneously varying in accordance with the variations of brightness of the object to be photographed during each exposure control cycle of the camera; and control means coupled to the light measuring means and to said electrically operated optical diaphragm, said control means being arranged to make the aperture of said electrically operated optical diaphragm instantaneously smaller when a light level of the object becomes brighter during an exposure control cycle of the camera and to make the aperture instantaneously larger when the light level becomes darker.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-11-14 | 1987-05-16 | 1987-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-14 | 1991-05-16 | 1991-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-14 | 1995-05-16 | 1995-11-15 | $7700.00 | Window Closed / Lapsed |