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| Number | Title | Issue Date |
| 7202949 | Binocular spectrometer A direct-view handheld binocular spectrometer for use in a variety of educational settings. The device comprises a holographic transmission diffraction grating and a uniquely curved quantitative wavelength scale for viewing visible-wavelength spectra with both eyes ... | 04/10/2007 |
| 7061684 | Finder optical system and camera provided with the same An observation optical system of the present invention comprises an image erect optical system and an eyepiece optical system for observing an object image. The eyepiece optical system comprises a positive single lens having double convex surfaces and a negative men... | 06/13/2006 |
| 7046925 | Superimpose-plate for view finder A superimpose-plate is put on a focusing glass, on which a subject image obtained through the photographing optical system is formed. The superimpose-plate and the focusing glass are provided in an incident opening of a hollow pentagonal mirror. The superimpose-plat... | 05/16/2006 |
| 6941069 | Light-projecting device A light-projecting device comprises an ocular optical system facing an emergent opening of a hollow pentagonal mirror. A superimpose-plate is provided in an incident opening of the hollow pentagonal mirror so that a subject image obtained through a photographing opt... | 09/06/2005 |
| 6516152 | Focusing screen for use in camera A focusing screen for use in a camera has a diffusive surface having a plurality of random pattern cells of one or a plurality of types arranged two-dimensionally so as to form a macroscopically flat surface. The random pattern cells are each composed of ... | 02/04/2003 |
| 5946505 | Finder system for a single lens reflex camera A finder system for a single lens reflex camera includes a focusing screen having a split prism, a penta roof mirror and an eyepiece lens system. The penta roof mirror has a hollow housing made of plastic material in the shape of a pentagonal prism whose ... | 08/31/1999 |
| 5909597 | Viewfinder of a camera A viewfinder of a camera having a multi-point type auto-focus function, in which a photographing lens can be focused on one of a plurality of objects in a plurality of focus detection zones within the field of view, when viewed through a viewfinder, inclu... | 06/01/1999 |
| 5839004 | Device and method for facilitating the focusing of a camera A device and a method for facilitating the focusing of a camera during a so-called tilt operation, in which an image plane/focusing plane of a camera is angled relative the optical axis of an objective lens or vice versa, in order to obtain an inclined pl... | 11/17/1998 |
| 5270758 | Waist level finder optical system A waist level finder optical system comprising, in order from the object side: an objective lens system for finder comprising a first lens unit having positive refractive power and a second lens unit having negative refractive power; a reflecting member f... | 12/14/1993 |
| 4757372 | SLR zoom camera A compact SLR camera embodies a zoom taking lens and a diagonal reflecting member along the axis of the taking lens that diverts the optical ray path coming through the lens element forwardly thereof to a viewing screen. The reflecting member is movable a... | 07/12/1988 |
| 4755840 | Reflex apparatus for the viewing of the ground-glass plate of a photographic camera The apparatus includes a casing, in which a reflector is mounted, which casing is attached on the one hand to a supporting frame and on the other hand via a bellows to the frame. The supporting frame is intended to be slipped onto the ground-glass plate o... | 07/05/1988 |
| 4707103 | Optical system of variable magnification An optical system of variable magnification including an image forming lens system having at least one optical member axially movable for varying the image magnification, and a light beam splitting device in the optical path of the lens system, the optica... | 11/17/1987 |
| 4573781 | Viewfinder having two image planes In the disclosed finder, a half transparent surface positioned behind a photographic lens splits off part of the light passing through the photographic lens to a first image plane at a position equivalent to a focal plane of the photographic lens. At leas... | 03/04/1986 |
| 4565433 | Viewfinder for camera In the disclosed viewfinder for a camera, the light passing through the photographic lens is reflected an even number of times, focused on a first image plane at a position equivalent to a prescribed focal plane of the photographic lens, and then further ... | 01/21/1986 |
| 4365883 | Focusing screen holding device A focusing screen holding device for a single-lens reflex camera including a focusing screen, a focusing screen holding frame including focusing adjusting screws, a focusing screen retaining spring, and a hinge on one leaf of which the focusing screen ret... | 12/28/1982 |
| 4357086 | Focus detecting optical device of a single lens reflex camera This specification discloses a focus detecting optical device for photoelectrically effecting focus delection by the use of two restricted light beams passed through different areas in the pupil of a phototaking lens in a single lens reflex camera includi... | 11/02/1982 |
| 4346973 | Focusing screen interchanging device in single lens reflex camera In a single lens reflex camera a focusing screen is removably attached with a focusing screen fitting member unitarily formed therewith for fitting the focusing screen in the camera body with a spring being provided therebetween to form a focusing screen ... | 08/31/1982 |
| 4338010 | Focusing screen mounting device A focusing screen mounting device for a camera which has a high stability and a minimum number of components to reduce the number of steps of adjustment needed during assembly. The focusing screen mounting device includes a focusing screen holder which is... | 07/06/1982 |
| 4251158 | Albada finder incorporating a range finder An albada finder incorporating a range finder comprising a first negative lens component, a second thick negative lens component and a third positive lens component, said second lens component being split into two elements along a plane inclined with rega... | 02/17/1981 |
| 4208115 | Viewfinder system with focusing screen A focusing screen of a viewfinder system for a photographic camera is designed as a liquid crystal cell having two transparent bodies which lie opposite one another with plane surfaces at a short distance from each other, these plane surfaces carrying ele... | 06/17/1980 |
| 4187016 | Viewfinder focusing screen supporting apparatus for single-lens reflex camera A finder screen-supporting apparatus for a single-lens reflex camera with an interchangeable focusing screen, comprises a screen support frame attachable to the camera body and directly supporting the focusing screen by four ends thereof, and a spring mem... | 02/05/1980 |
| 4124858 | Photographic camera having independent viewfinder and reflex focusing system A photographic camera apparatus of the type having distinct viewing-focusing and exposure operational modes is provided with a simple, independent, single window optical viewing apparatus suitable for aiming a camera to frame a relatively large format pic... | 11/07/1978 |
| 4121234 | Focusing and projection screen An optica image forming screen which comprises a multiplicity of light-transmitting elements in a matrix of light-absorbing elements so that light incident upon the elements at an angle greater than a predetermined angle will be internally absorbed by the... | 10/17/1978 |
| 4097881 | Focussing apparatus for cameras A focussing apparatus is disclosed comprising a mask plate disposed in the path of light to a camera rangefinder and having a plurality of apertures of like configuration which are offset from the optical axis of the rangefinder. Light passing through the... | 06/27/1978 |
| 4081807 | Reflex mirror for single lens reflex camera A reflex mirror 2, 2' for an SLR camera includes a fully reflective, elliptical area 2a, 2a' whose center coincides with the optical axis, and a surrounding, elliptical, semi-transparent area 2b, 2b'. The remaining area 2c, 2c' of the mirror is fully refl... | 03/28/1978 |
| 4081809 | Viewfinder system for a large camera Large camera viewfinder system in which an eyepiece is positioned at an upper rear portion of the camera, to permit eye-level viewing and free adjustment of camera attitude and a viewfinder objective lens assembly which has the same focal length as and is... | 03/28/1978 |
| 4072971 | Focus adjustment and determination means Focus adjustment and determination means wherein viewfinder and taking optical systems are positioned in close proximity and are displaced simultaneously by amounts proportional to their focal lengths.... | 02/07/1978 |
| 4063261 | View finder optical system A view finder optical system suitable for use in a single or twin lens reflex camera, using an image erecting-and-reflecting optical element. This optical element functions to change the image to be photographed appearing on the focusing plate of the came... | 12/13/1977 |
| 4027327 | View finder for reflex camera A holographic lens which functions to converge light passing therethrough is located on a plane equivalent to the focal plane of a taking lens of a reflex camera. An image of the object is formed on the holographic lens and viewed in enlarged scale throug... | 05/31/1977 |
| 3995294 | Camera viewing adapter An adapter for a reflex camera formed by an adjustable image reflector that is positionable on the camera with respect to its view finder.... | 11/30/1976 |
| 3971051 | Focusing screen The invention is a focusing screen with an integral split image rangefinder located substantially away from the geometric center of the focusing screen. Such an arrangement improves photographic image acuity and it encourages better photographic compositi... | 07/20/1976 |
