Abstract: An automatic focusing device for camera is so formed as to attain high precision and rapid automatic focusing even for those photographing lenses whose focal length is variable as in the case of zoom lens.

Abstract: A multi-metering device comprises division of an object field into a plurality of areas and metering said plurality of areas and generating a plurality of photoelectric outputs corresponding to said plurality of areas, a binary circuit for standardizing said plurality of photoelectric outputs by the average output of said plurality of photoelectric outputs, and a classifying circuit for classifying the object field on the basis of said standardized outputs and operating and extracting a proper metering output by the classifying output.

Abstract: Focus detecting device comprises a focus detecting optical system for guiding the light from an object onto a focus detecting plane, focus detecting means for identifying the focusing state from the image of the object formed on the focus detecting plane, means for generating a signal corresponding to the controlled actual F-number of the photographic optical system, means for generating a correction signal corresponding to the displacement of the optimum image plane of the photographing optical system according to the change of the controlled F-number, and means for correcting the output signal of the focus detecting means according to the correction signal.

Abstract: A zoom lens provided with a first group lens having a negative power and a second group lens having a positive power, the first group lens being moved in the direction of the optical axis for focus adjustment, the first group lens and the second group lens being moved in the direction of the optical axis for zooming, includes means for detecting the focused condition of the zoom lens to an object, the detecting means including optical means for receiving a light beam from the object which is discrete from a light beam incident on the zoom lens, and means for making an output signal representative of the focused condition from the light beam passed through the optical means, and means for integrally supporting the detecting means and the first group lens for conjoint movement in the direction of the optical axis.

Abstract: A lens barrel includes an imaging optical system for forming an image of an object on a predetermined imaging plane through a diaphragm corresponding to a predetermined aperture value. The lens barrel is mountable to a camera body and capable, when mounted to the camera body, of making the diaphragm respond to the exposure operation of the camera. The lens barrel includes an interlocking member displaceable in response to the exposure operation, means provided in the imaging optical system for stopping down the diaphragm during the exposure operation on the basis of the predetermined aperture value in response to the displacement, and control means for moving the imaging optical system on the basis of the positional relation between the image of the object and the imaging plane and for stopping the movement during the exposure operation in response to the displacement.

Abstract: An exposure control device of a camera comprises first metering means for effecting metering while dividing an object into a plurality of metering areas and for generating a first metering output determining the exposure of the entire object on the basis of a plurality of photoelectric outputs corresponding to said areas, second metering means for generating a second metering output corresponding to the object light passed through the aperture of a phototaking lens, first operational means for generating a first operation output including information on the difference between the first metering output and the second metering output, second operational means for synthesizing the second metering output during the stop-down of said aperture and the first operation output and generating a second operation output, and blocking means for blocking the stop-down when the second operation output and an output corresponding to a preset shutter speed assume a predetermined relation.

Abstract: In a focus detecting device in a single lens reflex camera including a main reflecting mirror capable of partly transmitting incident light therethrough disposed in a light-passing shaft formed by a mirror box provided between an objective lens and a film surface to direct a light beam passed through the objective lens to a viewfinder optical system, and an auxiliary reflecting mirror for reflecting the light transmitted through the main reflecting mirror toward a predetermined wall surface of the mirror box lying at a location opposed to the viewfinder optical system with the main reflecting mirror interposed therebetween, there are provided reflecting means having first and second reflecting surfaces for separating the light reflected by the auxiliary reflecting mirror into two mutually opposed directions substantially orthogonal to the optical axis of the objective lens along said predetermined wall surface, first and second photoelectric converter means provided on the optical paths of the light beams sep

Abstract: A metering device for metering an object field by dividing it into a plurality of areas and producing a plurality of metering outputs corresponding to the brightnesses of said areas includes means for extracting from the plurality of metering outputs a plurality of reference outputs different in level from one another, means for evaluating the level of at least one of the reference outputs, and means responsive to the evaluating means to select and put out one of the reference outputs.

Abstract: A focus detecting device has an objective lens, a pair of re-imaging lenses for receiving the light imaged by the objective lens to form a first and a second image, respectively, a pair of focus detecting photoelectric converters disposed near the focal planes of the pair of re-imaging lenses, respectively, the pair of photoelectric converters being adapted to produce photoelectric outputs corresponding to the position changes of the first and second images caused on the photoelectric converters by movement of the objective lens in the direction of the optical axis, and detecting means for receiving the outputs from the pair of photoelectric converters and detecting whether or not the objective lens is in its in-focus condition. The pair of re-imaging lenses are provided so that the F-number thereof in a direction perpendicular to the direction of movement of the images is smaller than the F-number thereof in the direction of movement of the images position-changed on the photoelectric converters.

Abstract: In a focus detecting device wherein, from an object light passed through an image forming optical system, a first image and a second image are formed by a pair of re-imaging optical systems and the in-focus condition of the image forming optical system with respect to an object is detected from the variations in position of the first and second images with respect to a pair of photoelectric converters disposed on or near the focal planes of the pair of re-imaging optical systems, there is provided shield means for shielding, substantially symmetrically with respect to the optic axis of the image forming optical system, part of light beams forming the first and second images formed on the pair of photoelectric converters by the image forming optical system and the pair of re-imaging optical systems.

Abstract: In a focus detecting device for a camera in which, from an object light passed through a focus plate removably provided on the image formation plane of a phototaking lens, a first image and a second image are formed by a pair of re-imaging optical systems with the in-focus condition of said phototaking lens with respect to an object is detected from the variations in position of said first and second images with respect to a pair of photoelectric converters disposed on or near the focal planes of said re-imaging optical systems, said focus plate being provided with a field lens, there are provided means for shielding, substantially symmetrically with respect to the optic axis of said phototaking lens, part of light beams forming said first and second images formed on said pair of photoelectric converters by said phototaking lens and said pair of re-imaging optical systems, and means for driving said shield means in response to the mounting of said focus plate onto the camera.

Abstract: An automatic focusing device in a camera comprises drive means for moving a picture-taking lens in the direction of the optic axis so that the picture-taking lens can be focused to an object from the shortest distance to infinity, detector means having photoelectric converter means and adapted to emit a focus position signal when the image formation plane of the object by the picture-taking lens is not coincident with an optimal focusing plane and to emit a focusing signal when the image formation plane is substantially coincident with the optimal focusing plane, a shutter release operating button displaceable between a first operating position and a second operating position and adapted, when displaced to the second operating position, to release the shutter of the camera, trigger means adapted to emit an operating signal when the shutter release operating button is displaced to the first operating position, and means for controlling the drive means such that the picture-taking lens is moved in response to a

Abstract: An exposure display device for a camera including a metering device for effecting metering while dividing a phototaking picture plane into a plurality of areas and for emitting a plurality of photoelectric conversion signals corresponding to those areas and processing circuitry for operating and emitting a proper exposure signal from the output signals of the metering device comprises comparing circuitry for comparing the plurality of photoelectric conversion signals with the proper exposure signal and emitting the result of the comparison, and a display device for displaying the comparison results emitted by the comparing circuitry while causing the comparison result to correspond to the divided areas.

Abstract: An improved exposure control apparatus for camera comprises a metering circuit, exposure operational circuit, correction value calculating circuit and correction operational circuit. The metering circuit meters a plural number of divisional sections of the field of an object and generates a plural number of photoelectric outputs corresponding to the respective sections of the field. The exposure operational circuit calculates an exposure value from the plural number of photoelectric outputs. The correction value calculating circuit calculates correction values for correcting the distribution characteristics of said photometric outputs relative to the distribution characteristics of illumination on the focal plane of the photographing lens of the camera at the time of photographing, the correction values corresponding to the sections of the field respectively.

Abstract: This specification discloses a reflecting mirror device in a single lens reflex camera for receiving light passed through the picture-taking lens of the camera during finder observation, the reflecting mirror device reflecting said light and directing it to a finder optical system, while, at the same time, passing therethrough part of said light and directing it to the light-receiving portion of a metering system. The reflecting mirror device has a number of pin-holes irregularly arranged on the reflecting surface thereof.

Abstract: A large aperture ratio interchangeable lens for a single lens reflex camera comprises a lens body, a preset aperture ring provided for rotation with respect to the lens body, a first signal member operatively associated with the preset aperture ring to transmit a corrected difference signal (f-f.sub.O -.DELTA.f) to the camera body, and a second signal member for transmitting a corrected open value signal (f.sub.O +.DELTA.f) to the camera body.

Abstract: A metering device of a camera comprises a first photoelectric device provided with a light-receiving surface divided into a plurality of light-receiving portions each having a predetermined configuration, a second photoelectric device provided with a light-receiving surface divided into a plurality of light-receiving portions having configurations corresponding to the plurality of light-receiving portions of the first photoelectric device, and optical means for forming an object field image on the light-receiving surfaces of the first and second photoelectric devices so that metering areas metered by the light-receiving surfaces of the first and second photoelectric devices partly overlap each other on a phototaking picture and that the entire phototaking picture is substantially covered by the metering areas.

Abstract: In an objective lens removably mountable with respect to a camera housing and having a diaphragm member forming an aperture and diaphragm driving means displaceable to stop down the diaphragm member in a range over which the area of the aperture is from maximum to minimum, the housing having a metering circuit for measuring the light transmitted through the lens when the aperture is maximum, diaphragm correcting means are provided on at least one of the diaphragm driving means and the diaphragm member to impart a correction of the stop down step number corresponding to the difference between a theoretical metering output calculated from the open F-value of the lens and the brightness of an object and the actual metering output of the metering circuit, to the relation between the variation in area of the aperture and the displacement of the diaphragm driving means.

Abstract: A diaphragm mechanism of a photographic lens comprises a plurality of diaphragm blades defining an aperture opening, a stop-down lever, transmission means for transmitting the movement of the stop-down lever to the diaphragm blades to displace them and determine the aperture opening, and cam means for controlling the amount of displacement of the diaphragm blades for the amount of movement of the stop-down lever.

Abstract: An automatic diaphragm aperture control device used with a camera having an objective lens, a diaphragm having a diaphragm aperture, a shutter mechanism and a shutter speed selecting mechanism.