Camera with exposure control mechanism

A camera including an objective lens, a diaphragm, a camera body in which a film is located at the focal plane of said objective lens, a focal plane shutter having a leading member and a trailing member which control the light reaching an image plane of the film to be exposed, the reflectance of the surface of said leading member being substantially equal to that of the surface of the film, means for driving said leading member to initiate an exposure of the film, and an exposure control mechanism, said exposure control mechanism comprising:

• light measuring means for generating an output commensurate with the brightness of an object to be photographed, said light measuring means including photosensitive means disposed in said camera body so as to be capable of receiving scene light having passed through said objective lens and said diaphragm and reflected from the area of the surface of said leading member and the surface of the image plane of the film as said leading member is driven so as to expose the film;
• means for changing the light receiving angle of said photosensitive means, said light receiving angle changing means being movable between a first position in which said light receiving angle changing means is in alignment with the image plane of the film and said photosensitive means and a second position in which said light receiving angle changing means has been withdrawn from said first position, in such a manner that said photosensitive means receives scene light reflected from one of two areas on the surface of said leading member and the surface of said film in dependence upon whether said light receiving angle changing means is in its first position or in its second position, said two areas being different from one another in dimensions;
• switch means for moving said light receiving angle changing means between its first and second positions;
• and,
• means for controlling an exposure in accordance with the output of said light measuring circuit.

A camera including an objective lens, a diaphragm, a camera body in which a film is loaded at the focal plane of the objective lens, a focal plane shutter having a leading member and a trailing member which control the light reaching an image plane of the film to be exposed, the reflectance of the leading member being substantially equal to that of the surface of the film, means for driving the leading member to initiate an exposure of the film, and an exposure control mechanism, the exposure control mechanism comprising:

• light measuring means for generating an output commensurate with the brightness of an object to be photographed, said light measuring means including photosensitive means disposed in the camera body for receiving scene light passing through said objective lens and said diaphragm and reflected from substantially the entire area of both the surface of said leading member and the image plane of the film as said leading member is driven so as to expose the film;
• means for controlling an exposure in accordance with the output of said light measuring means;
• light restricting means for restricting scene light from being received by said photosensitive means, said light restricting means being movably supported on said camera body and positioned in front of said photosensitive means;
• first operable means for moving said light restricting means in front of said photosensitive means in a first direction transversing the scene light advancing to said photosensitive means;
• and,
• second operable means for moving said light restricting means in front of said photosensitive means in a second direction substantially perpendicular to said first direction and transversing the scene light advancing to said photosensitive means;
• whereby the area of the surface of said leading member and the image plane of the film, from which light received by said photosensitive means is reflected, is varied in a two dimensional direction in accordance with the operation of said first and second operable means.

A camera including an objective lens, a diaphragm, a camera body in which a film is located at the focal plane of the objective lens, a focal plane shutter having a leading member and a trailing member which control the light reaching an image plane of the film to be exposed, the reflectance of the leading member being substantially equal to that of the surface of the film, means for driving the leading member to initiate an exposure of the film, and an exposure control mechanism, said exposure control mechanism comprising:

• light measuring means including a plurality of photosensitive means disposed in said camera body to respectively receive scene light passing through said objective lens and said diaphragm and reflected from different portions of the entire area of the surface of said leading member and exposed portions of said film;
• operable means for selectively activating said photosensitive means of said light measuring means, said light measuring means generating an output commensurate with the average value of the outputs of said activated photosensitive means;
• and,
• means for controlling an exposure in dependence upon the output of said light measuring means.

A camera including an objective lens, a diaphragm, a camera body in which a film is loaded at the focal plane of the objective lens, a focal plane shutter having a leading member and a trailing member which control the light reaching an image plane of the film to be exposed, the reflectance of the surface of the leading member being substantially equal to that of the surface of the film, means for driving the leading member to initiate an exposure of the film, and an exposure control mechanism, said exposure control mechanism comprising:

• light measuring means for generating an output commensurate with the brightness of an object to be photographed, said light measuring means including photosensitive means being disposed in said camera body so as to be capable of receiving scene light passing through said objective lens and said diaphragm and reflected from substantially the entire body of both the surface of said leading member and the image plane of the film as said leading member is driven so as to expose the film;
• light restricting means movable from a first position for enabling the scene light reflected from said entire area to be received by said photosensitive means to a second position for permitting only the scene light reflected from a predetermined portion of said entire area to be received by said photosensitive means and said light restricting means also being movable to a third position for enabling only the scene light reflected from another predetermined portion of said entire area to be received by said photosensitive means;
• switch means for moving said light restricting means between its first, second and third positions;
• and,
• means for controlling an exposure in accordance with the output of said light measuring means.

A camera including an objective lens, a diaphragm, a camera body in which a film is loaded at the focal plane of the objective lens, a focal plane shutter having a leading member and a trailing member which control the light reaching an image plane of the film to be exposed, the reflectance of the surface of the leading member being substantially equal to that of the surface of the film, means for driving the leading member to initiate an exposure of the film, and an exposure control mechanism, said exposure control mechanism comprising:

• light measuring means for generating an output commensurate with the brightness of an object to be photographed, said light measuring means including photosensitive means being disposed in said camera body so as to be capable of receiving scene light passing through said objective lens and said diaphragm and reflected from substantially the entire area of both the surface of said leading member and the image plane of the film as said leading member is driven so as to expose the film;
• light restricting means movable from a first position for enabling the scene light reflected from said entire area to be received by said photosensitive means to a second position for permitting only the scene light reflected from a predetermined portion of said entire area to be received by said photosensitive means and said light restricting means including a light blocking member having a central aperture and being positioned in front of said photosensitive means;
• switch means for moving said light restricting means between its said first and second positions, said switch means including means for selectively moving said light blocking member to a position adjacent to said photosensitive means and to a position apart from said photosensitive means with said aperture being aligned with said photosensitive means and said image plane of said film, such that said light blocking member is moved between the position adjacent to said photosensitive means and the position apart from said photosensitive means respectively when said switch means moves said light restricting means between its first position and its second position;
• and,
• means for controlling an exposure in accordance with the output of said light measuring means.