Abstract: A document reading apparatus comprising a document table, a reading section disposed above the document table for reading a document, e.g. an opened book, placed on the document table, and a linear light source for emitting light to the opened book at an angle thereto. The reading section includes a sensor for detecting an image of the light emitted to the book. This image displays a brightness distribution over surfaces of the opened book including curvatures adjacent the joint. The brightness distribution is used as a reference for rectifying an image signal corresponding to the opened book when the document image is reproduced.

Abstract: A focus condition detecting device which eliminates a wasteful operation thereof to obtain optical results of detection in a shortest period of time and wherein it can be discriminated correctly depending upon data read from a lens regarding an exit pupil of the lens whether or not detection of a focus condition is possible. The device comprises an optical means which forms a plurality of pairs of light images from beams of light from pairs of areas of an exit pupil plane of an interchangeable lens. Relative displacements between the light images are detected by a plurality of focus condition detecting means. Data regarding optical characteristics of the lens are read from the lens, and in accordance with the data thus read, those ones of the focus condition detecting means for which detection of a focus condition is possible are selected from an optical relationship between the optical means and the exit pupil of the lens.

Abstract: An image sensor system for sensing an image of an object includes a plurality of image sensor arrays. Each array comprises photoelectric converting elements arranged to receive the object image and accumulation cells coupled to each photoelectric converting element for accumulating charges produced from the photoelectric converting element. A buffer memory cells are coupled respectively to the accumulation cells for temporarily storing the accumulated charges shifted from the accumulation cells in response to the completion of the charge accumulation in each array. A shift register is provided to receive accumulated charges from the buffer memory cells in every one of the arrays after all the arrays complete the charge accumulation. The accumulated charges stored in the shift register are then sequentially outputted.

Abstract: An aperture value determining apparatus in taking photographs with flash light in accordance with the present invention receives a full open aperture value of a taking lens employed, information in association with object distance, information in association with film speed, a guide number of a flash apparatus and information in association with shutter speed, measures brightness of an object to be photographed, determines an exposure controlling value based on the information of film speed and on the brightness, calculates a maximum aperture value enabling proper photographing operation with flash light based on the information of the object distance, the information of film speed and the guide number, and sets prescribed aperture value larger than the full open aperture value. The aperture value is determined based on the magnitude of the prescribed aperture value in association with the maximum aperture value, the information of the shutter speed and on the exposure value.

Abstract: An optical system for detecting focusing condition comprises a pair of image re-forming lenses and an aperture mask. The image re-forming lenses are configured with a pair of plano-convex lenses having equal radius of curvature R and an equal axial thickness T. R is nearly equal to T (R.apprxeq.T). The aperture mask has apertures corresponding to the respective plano-convex lenses and is attached closely to the flat surfaces of the plano-convex lenses. Comatic aberrations for the respective light fluxes passing through the apertures become nearly same, and therefore point images formed by the respective light fluxes also become nearly same. Consequently, high accuracy of focusing condition detection is established.

Abstract: Brightness of a central area in a scene to be photographed and brightness of a peripheral area around the central area are measured, and the brightnesses of respective areas are outputted as first and second values. When the second value is larger than the first value, the first value is corrected by a value which has no relation with the respective measured values. Consequently, a proper controlling brightness value is provided for controlling the exposure.

Abstract: A camera with an automatic focusing device has an objective lens mounted on a camera. An image formed by the objective lens is divided into a plurality of zones. In each zone, a brightness distribution is obtained so as to detect a rough focusing condition in each zone, thereby producing a plurality of rough focusing condition data. Based on the result of the rough focusing condition data, one zone is selected. Furthermore, a precise focusing condition is detected in the selected zone based on the light contained in the selected zone, so as produce a precise focusing condition data. Based on the precise focusing condition data obtained from the selected zone, the objective lens is driven to an infocus condition.

Abstract: According to this invention, a camera system has a camera body and a first and second lenses exchangeable to the camera body. The first lens comprises a device for outputting first data which indicates the first lens belongs to a first lens type. The second lens comprises a device for outputting second data which indicates the second lens belongs to a second lens type and third data with respect to the characteristic of the second lens.

Abstract: A focus detecting device which comprises an objective lens for forming an image of an object, a condenser lens, located behind a predetermined focal plane of the objective lens, for converging the light passed through the objective lens, a pair of image re-forming lenses, located behind the condenser lens, for re-forming a pair of secondary images of the image formed by the objective lens on an off-axial region of the objective lens located at a position far from the optical axis thereof, a light direction changing device, located nearby the condenser lens, for changing the direction along which light bundles forming the secondary images passes towards the optical axis, and a light receiving device for receiving the pair of the secondary images formed by the secondary image forming means to produce a light intensity distribution signal representing the light intensity distribution of the secondary images, a focus condition calculating device for calculating a focus condition of the objective lens by means of

Abstract: A solid state image sensor drive apparatus in accordance with the present invention enables a solid state image sensor to start integration of photoelectric current in response to an integration clear signal so that electric charges are accumulated to a prescribed level and transferred to a shift register. The accumulated electric charges transferred to the shift register are read out successively based on a transfer signal so that it is supplied to a microcomputer performing various operations. At this time, if a request for interruption is inputted from a load to the microcomputer, the transfer signal supplied to the shift register is stopped and the content of the shift register is not supplied to the microcomputer. When the interruption processing in the microcomputer is completed, the transfer signal is supplied again to the shift register so that transfer of data from the shift register to the microcomputer is restarted.

Abstract: In the present apparatus, a field mask is arranged at the predetermined focal plane of a photographic lens of a camera. This mask is formed with central rectangular opening horizontally and a pair of side rectangular openings vertically extending. Light bundles passed through these rectangular openings are subjected to condensation by passing through respective condenser lenses. At a downstream, there is provided a re-imaging plate which is formed with corresponding three pairs of re-imaging lenses. All these re-imaging lenses are made into plano-convex shape having one and the same radius of curvature and molded solid with the substrate board of said re-imaging plate into a solid one piece.

Abstract: An image sensor system for sensing an image of an object includes a plurality of image sensor arrays. Each array comprises photoelectric converting elements arranged to receive the object image and accumulation cells coupled to each photoelectric converting element for accumulating charges produced from the photoelectric converting element. A buffer memory cells are coupled respectively to the accumulation cells for temporarily storing the accumulated charges shifted from the accumulation cells in response to the completion of the charge accumulation in each array. A shift register is provided to receive accumulated charges from the buffer memory cells in every one of the arrays after all the arrays complete the charge accumulation. The accumulated charges stored in the shift register are then sequentially outputted.

Abstract: A light measuring device for an exposure measurement at open aperture, lens-interchangeable photographic camera of a type capable of measuring the brightness of a target object to be photographed through a photo-taking lens assembly for the determination of an exposure amount, which device comprises a reading circuit for reading, from an interchangeable lens assembly, data associated with an exit pupil of the interchangeable lens assembly and data associated with the full aperture value of the interchangeable lens assembly, and a correcting circuit for calculating a correction value for a measured light value on the basis of the data read out by the reading circuit, for the purpose of exposure correction.

Abstract: A focus detection apparatus of a camera comprising a plurality of focus condition detecting units, each of which includes at least a pair of re-imaging lens forming a pair of secondary images using a pair of light rays passed through a photo-taking lens and a condenser lens, and a CCD (charge-coupled device) line sensor receiving the images and detecting a focus condition of the photo-taking lens. All of the focus detection areas defined by each of the focus condition detecting units are located parallel one another and overlaps partially at least one other focus detection area in a perpendicular direction to a direction in which all of the focus detection areas extend. Therefore, there is no space, where the focus condition cannot be detected, among the focus detection areas in the parallel direction in which all of the focus detection areas extend.

Abstract: An automatic focusing divice for a camera is disclosed. The automatic focusing device has sensing means for sensing light intensity distributions within narrow and wide areas of a field of view of an objective lens, respectively and can be operated in either operation mode of one-shot AF mode and continuous AF mode. When the one-shot AF mode is designated, said narrow area which is narrower than said wide area is automatically selected for focus condition detection and, when the continuous AF mode is designated, said wide area is automatically selected.

Abstract: A camera with a multi-zone focus detecting device has an objective lens mounted on a camera. An image formed by the objective lens is divided into a plurality of zones. In each zone, a focusing condition is detected based on the image formed by the objective lens so as to produce a plurality of focusing condition data. Based on the result of the focusing conditions, one zone is selected. Furthermore, a light which has passed through the objective lens is measured separately in each zone so as to produce a plurality of measured light data. Based on a focusing condition data obtained from the selected zone, the objective lens is driven to an infocus condition. When the objective lens is driven to the infocus condition, a measured light data obtained from the selected zone is used for calculating exposure data with which the exposure is controlled.

Abstract: A focus condition detecting system for a cata-dioptric lens wherein it can be judged correctly whether or not detection of a focus condition is possible, and a cata-dioptric lens for use with the focus condition detecting system. The system comprises a focus condition detecting means for detecting a relative displacement between a pair of images of light formed by a pair of optical means from beams of light from a pair of different areas of a plane of an exit pupil of a cata-dioptric lens to detect a focus condition of the lens. Data regarding outer and inner radii of an exit pupil or some other peculiar data are fixedly stored in the lens. The data are successively forwarded to a camera body, and depending upon the data, it is judged whether optically accurate detection of a focus condition is possible from a combination of the optical means and the lens. When the judgment is affirmative, the detecting means is rendered operative.

Abstract: In a camera having an automatic focus detection device of active type, an auxiliary light source to project light to the object for the purpose of automatic focus detection is shared to a self-timer indicator.

Abstract: A focus detecting optical system is disclosed which includes an objective lens for forming an image of an object, a plurality of focus detecting blocks, and a focus condition calculating device for calculating a focus condition of the objective lens in accordance with the light intensity distribution signals produced by the plurality of the focus detecting blocks. Each of the focus detecting blocks includes a condenser lens located nearby a predetermined focal plane of the objective lens, a pair of image re-forming lenses located behind the condenser lens for reforming a pair of secondary images of the image formed by the objective lens, a mask plate having a pair of apertures through which light fluxes forming the secondary images pass and a light receiving unit for receiving the pair of the secondary images formed by the pair of image re-forming lenses to produce a light intensity distribution signal representative of the light intensity distribution of the secondary images.

Abstract: A focus condition detecting device which eliminates a wasteful operation thereof to obtain optical results of detection in a shortest period of time and wherein it can be discriminated correctly depending upon data read from a lens regarding an exit pupil of the lens whether or not detection of a focus condition is possible. The device comprises an optical means which forms a plurality of pairs of light images from beams of light from pairs of areas of an exit pupil plane of an interchangeable lens. Relative displacements between the light images are detected by a plurality of focus condition detecting means. Data regarding optical characteristics of the lens are read from the lens, and in accordance with the data thus read, those ones of the focus condition detecting means for which detection of a focus condition is possible are selected from an optical relationship between the optical means and the exit pupil of the lens.