Class 396/119 - Photoelements with different optical path lengths

Subclass of Class 396 - Photography
Definition: Subject matter wherein the photoelement system includes
No. of patents: 39
Last issue date: 02/19/2008

Number	Title	Issue Date
7333182	Range finder and method of reducing signal noise therefrom A range finder includes an optical sensor circuit including optical sensors and an integrator circuit disposed for the optical sensors. It further includes selection switches (MOSFETs), which selectively connect optical sensors to the integrator circuit, non-selecti...	02/19/2008
7262805	Focus detecting system A focus detecting system for determining the focus state of an imaging lens, such as a camera lens, is disclosed. Object light not forming an image for image production is deflected along an optical axis through a relay lens to a focus state detection unit that incl...	08/28/2007
6975810	Focal point detection device and camera A camera comprises a spatial modulation optical filter that is disposed in a viewfinder optical system for subject observation at or near a position optically equivalent to an estimated image forming plane of a photographic optical system and modulates a subject lig...	12/13/2005
6973264	Focal point detection apparatus, focusing system, camera, and focal point detection method First to third liquid crystal filters are arranged at first to third different distances from a predeterminate image formation surface. Light flux passing through the liquid crystal filters is received by a photodiode and converted into an electric signal. A variabl...	12/06/2005
6124921	Method and apparatus for judging an error in reading data recorded in a photographic film A method for judging an occurrence of an error when reading magnetic data obtained by scanning magnetic recording portions provided in conformity with the respective frames of a photographic film F by a magnetic data reader. The method comprises detecting...	09/26/2000
5930054	Lens position control apparatus A lens position control apparatus includes an absolute position detecting part for detecting the absolute position of a lens, a relative position detecting part for detecting the relative position of the lens, a driving part for driving the lens, and a co...	07/27/1999
5822627	Focus state detection device A compact focus state detection device having a plurality of focus state detection areas at the center of and away from the center of the photo field. A first focus state detection optical system has focus state detection areas away from the center of the...	10/13/1998
5659813	Camera with focus detecting device for removing vignetting effects In a camera and an autofocus controlling method thereof, displacement amounts between intensity distributions of light at corresponding first and second areas of an image sensing device are detected, and a plurality of displacement detection signals are g...	08/19/1997
5568249	Phase difference detection type rangefinder and method of measuring subject distance A phase difference detection type rangefinder is provided which calculates a distance value of each subject of two or more subjects at different distances. The rangefinder has a correlation calculation unit for calculating a correlation factor between ima...	10/22/1996
5475429	In-focus sensing device for sensing an in-focus condition using a ratio of frequency components at different positions In an in-focus sensing device for a camera, an optical system directs the luminous flux from the subject. An optoelectric transducer section converts the optical distribution of the luminous fluxes with different optical path lengths passing through the o...	12/12/1995
5432594	Optical distance measurement device using image sensors for determining distance to symmetric objects An optical distance measurement device for determining the distance to a object 5 exhibiting a bilateral symmetry, such as an automobile, includes two optical systems whose optical axes are separated by a lateral distance perpendicular to the axis of symm...	07/11/1995
5402198	Focus detecting apparatus A focus detecting apparatus for detecting the focus of a photo-taking lens comprises a condenser lens disposed near the predetermined image plane of an object formed by the photo-taking lens, and a plurality of focus detection systems. Each of the focus d...	03/28/1995
4994919	Camera for recording television, photographic or cinematographic images, including an automatic focus-setting device A camera for recording television, photographic or cinematographic images includes an automatic focus-setting device. Information for this device is obtained with the aid of two optical paths having different path lengths present in an optical lens system...	02/19/1991
4908504	Focus detecting optical system 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 ac...	03/13/1990
4881799	Varifocal lens device Compensation of a deviation produced in the image forming position of a varifocal lens in consequence of magnification is attained by transforming a compensation amount into a relative amount of movement through arithmetic operation and driving the focusi...	11/21/1989
4833315	Automatic focus detecting device in which two object images formed through different light paths are converted to photoelectric signals Method and apparatus for detecting a focus condition of an optical system forms two images of an object, the images propagating along two different optical paths. The two images are received with a plurality of photosensitive elements. The photosensitive ...	05/23/1989
4640613	Image data comparison circuit for rangefinders In the particular embodiments of the invention disclosed herein, an image data comparison circuit receives digital image signal trains from two light sensor arrays of a rangefinder and compares the signals in the signal trains while they are being shifted...	02/03/1987
4611910	Range finder A range finder wherein a photocurrent in a predetermined number of light receiving elements corresponding to images formed by a first and a second optical devices for receiving light reflected by an object through different light paths on a focal plane, a...	09/16/1986
4600830	Focus detecting device A focus detecting device for optical devices such as cameras and microscopes, which like the human eye, can detect a point of focus in response not only to the contrast of an object but also to differences in hue. The invention provides a device which pro...	07/15/1986
4536073	Apparatus for detecting a condition of sharpest focus A real image of an object is projected by an objective lens to at least a pair of photosensitive elements on opposite side of a prescribed focal plane, wherein use is made of a secondary image forming lens between the objective lens and the pair of photos...	08/20/1985
4506970	Focus detection device A focus detection device is disclosed which has a light path splitting apparatus provided just in front of a diaphragm in the optical path of an image forming optical system and a different optical system from the aforesaid image forming optical system in...	03/26/1985
4491402	Method of focus detection A method of focus detection is disclosed, in which at least two pairs of light receiving element rows are arranged with respect to a photographing lens, and light splitters, each of which wave front splits the light flux from the photographing lens into t...	01/01/1985
4488799	Metering system using a focus detecting optical system There is provided a metering system using a focus detecting optical system characterized in that in a light path formed by an optical system for directing a light beam to focus detecting photoelectric transducer means, metering photoelectric transducer me...	12/18/1984
4472040	Automatic focusing camera This invention relates to a camera capable of automatic focusing by displacing a focusing lens in an interchangeable lens in accordance with a focusing signal obtained from focus detecting elements for receiving the light passing through said interchangea...	09/18/1984
4469939	Distance measuring apparatus A distance measuring apparatus is provided with first and second imaging lenses for distance measurement for forming images of the same object, a first photoelectric device having a light-receiving surface for receiving the first image by the first imagin...	09/04/1984
4466718	Automatic exposure control for automatic-focus cameras When a trigger lever is depressed, both a focus adjuster ring and a control disk commence to rotate in unison, driven by a spring mechanism. Position-sensing switches receive signals indicating which subject-distance setting the focus adjuster ring should...	08/21/1984
4458145	Automatically focussed optical system An automatically focussed optical system in which two arrays of photosensitive detectors have different optical spacings respectively in front of and behind the image plane of the system, and sense different portions of the image. Differences in electrica...	07/03/1984
4453818	Method of automatically adjusting focus conditions A method of automatically adjusting focus conditions of photographic optical system is disclosed. In the method at least a part of optical image formed on a predetermined focal plane by an optical system is projected onto first and second photocell arrays...	06/12/1984
4432622	Focusing-position-detection circuit A focusing position detection circuit provided with a pair of light receiving element arrays respectively disposed in front of and behind a predetermined focusing plane of an optical system, capable of determining the position of the optical system by the...	02/21/1984
4389105	Device for detecting coincident focusing points A device for detecting coincident focusing points for use in the controlling of the focusing of an automatically focusable lens comprises a single array of light receiving transducers for converting the distribution of light intensity of an image applied ...	06/21/1983
4375332	Anti-ghost device for optical distance measuring system In the disclosed optical distance measuring system, a pair of mirrors spaced from each other along a base line direct light coming from a scene along two optical paths onto reflecting surfaces of a prism positioned between them and through a pair of image...	03/01/1983
4352545	Camera focus detecting device An automatic focus detecting device for a camera adapted to be miniaturized and provided in the form of an integrated circuit. Two arrays of light receiving elements or sensors are disposed in two planes parallel to the surface of the film in the camera o...	10/05/1982
4349254	Camera focus detecting device A focus detecting device for a camera in which at least first and second groups of light receiving elements are disposed in planes parallel to each other and to the plane of the film in the camera. The absolute values of the difference between the signals...	09/14/1982
4341447	Infrared camera ranging system A passive infra-red ranging system for a photographic camera or the like includes two infra-red responsive sensors spaced apart a predetermined distance from one another on the camera body. Each sensor includes a plurality of vertically aligned segments w...	07/27/1982
4331399	Focal point coincidence sensing device A focal point detecting device comprises a light-receiving device having a plurality of light-receiving elements which receive incident light coming from two different light paths. In the first step, the light-receiving device receives the incident light ...	05/25/1982
4307947	Focus detecting device for camera A focus detecting device for a camera in which a portion of the light passing through a photographing lens is reflected to a first surface of a plane plate of transparent material. After passing through the plane plate, the beam is split by a half-silvere...	12/29/1981
4251143	Photographic camera with means indicating the state of focus A camera includes a viewfinder, an objective and a manually operated focus adjuster. An optical system located in the path of incoming image light splits the incoming image light beam into two component beams projected into respective first and second foc...	02/17/1981
4240727	Focussing system A first photodetector arrangement comprises three adjoining photodetectors, and a second comprises six. First and second optics, and the two photodetector arrangements, are located immovable on the camera, and the optics project onto the first arrangement...	12/23/1980

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Class 396/119 - Photoelements with different optical path lengths