Exposure control apparatus

Claim 2

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

An exposure control apparatus according to claim 1, wherein said electrically operated optical diaphragm is formed with transparent ceramic.

Claim 4

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

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

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

An exposure control apparatus according to claim 4, wherein said electrically operated optical diaphragm is formed with transparent ceramic.

Claim 8

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

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

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

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

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

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

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.