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Searching: photography





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Patent # Description
US-4,100,087 Pressure-fixing magnetic developer containing hydrogenated polystyrene binder for electrostatic photography and...
A pressure fixing developer for electrostatic photography comprising a finely divided magnetic material and a binder as effective components and consisting...
US-4,099,880 Method and an apparatus for stereoscopic measurement utilizing a three-dimensional image
A method and apparatus for stereoscopic measurement of an actual value of depth in a subject through its three-dimensional image obtained from two ...
US-4,099,847 Zoom lens system capable of close-up photography
Variable power lenses and correcting lenses are integrally moved a prescribed distance toward an object to be photographed without changing a spacing maintained...
US-4,099,221 Portable ceiling reflector for photography
A reflector assembly that serves as a portable ceiling for reflecting bounce flash to a photographed object. The assembly includes a support rod fastened to a...
US-4,098,783 Dye substituted cyclic 1,3-sulfur-nitrogen compounds as dye image-forming materials in photography
This invention relates to color providing compounds useful as dye image-forming materials in color photographic processes. These compounds comprise a complete...
US-4,096,498 Exposure propriety indicating device for flash-photography
An exposure propriety indicating device for flash-photography constructed with a circuit comprising a film sensitivity signal generating circuit, an aperture...
US-4,093,348 Lens system with frontal aperture stop
An objective lens system particularly adapted for photography with a frontal aperture stop is provided. The lens system includes four lens components including a...
US-4,092,544 X-ray photographic apparatus comprising light source and receiving device arranged to facilitate the alignment...
This invention discloses an X-ray photography device having an X-ray tube associated with a primary diaphragm for defining or limiting the X-ray beam by...
US-4,091,398 Electronic photoflash unit having remote control device transmitter function
Electronic photoflash unit has functions as a remote control device transmitter and as photoflash for flash photography. The photoflash unit decreases the amount...
US-4,091,396 Camera exposure control and indicating circuitry responsive to a signal from a flash device
Camera exposure control circuitry for automatically controlling exposure time or the diaphragm aperture in accordance with scene brightness, is provided with an...
US-4,089,590 Zoom lens barrel having macro-photographing mechanism
A zoom lens barrel having a macro-photographing mechanism including a main barrel carrying a control ring assembly which is divided into a first operating ring...
US-4,087,574 Method of subbing plastic films
A method of subbing plastic films, particularly for use in photography, comprising applying an aqueous subbing composition to a surface thereof, the aqueous...
US-4,087,173 Document photography system
A document photography system photographs the obverse and reverse faces of a moving document by tracking the document with a moving lens. The motion of the lens...
US-4,086,585 System and camera for controlling depth of field in three-dimensional photography
In the exemplary embodiments of the invention disclosed, a system especially adapted for producing stereoscopic pictures in general photography includes a camera...
US-4,086,583 Light source and exposure control device for endoscopic photography
An endoscopic photography system including a side shutter 4 for a light source 3, a camera 5 including means for closing the side shutter 4 before the camera...
US-4,086,582 Exposure control device for a camera
An exposure control device in which the output of a light measuring circuit which produces an electrical signal corresponding to the brightness of an object is...
US-4,085,410 Photoflash mounting automatic light control camera
A camera accommodating film cartridges having structural signals differently configured according to the corresponding film speeds and selectively accepting a...
US-4,084,359 Survey apparatus
A survey system employs a ground-based extendible mast so that survey instruments, such as cameras, mounted at the top of the mast can attain heights comparable...
US-4,083,059 Automatic exposure control system for flash photography
In a camera provided with a day-light exposure range and with a flash exposure range, an automatic exposure control system for controlling the iris of the camera...
US-4,083,058 Flash and camera apparatus having a plurality of flash and daylight operation modes
Flash and camera apparatus integrally incorporating an electronic flashing device for firing a flash discharge tube and a photographic camera device with a fixed...
US-4,082,809 P-Benzoquinone diketals
P-Benzoquinone diketals of the formula ##STR1## wherein R is an alkyl group having from 1 to 4 carbon atoms or a halogen atom, preferably CH.sub.3, Cl or F....
US-4,082,681 Magnetic developer for electrostatic photography and process for preparation thereof
A developer for electrostatic photography comprising as indispensable components a fine powder of a magnetic material and a binder resin, said developer...
US-4,080,504 Novel photographic color coupling compounds
Novel magenta-forming 3-anilino-2-pyrazolin-5-one color couplers for use in silver halide photography are described wherein the anilino group carries an...
US-4,078,932 Hardening developers for silver halide photography
A hardening developer is described which comprises at least one silver halide developing agent and a reaction product of a dialdehyde hardener with an aliphatic...
US-4,077,042 Control means for photoflash photography system
A photoflash photography system includes a camera separably housing individual film cartridges carrying indicia, physical or electrical, representing the...
US-4,076,404 Method of and apparatus for electronic color photography and photosensitive member used for the same
The photosensitive member consists basically of a supporting base, a photoconductive layer and an insulating layer dyed in a desired color for providing a color...
US-4,075,666 Magnetic tape recorder
An arrangement for slow-speed recording of video signals on magnetic tape. Long recording time capacity and economy of tape are achieved by a reduction of tape...
US-4,075,021 Photosensitive material for color photography
The present invention discloses a multi-layer photosensitive material for color photography in which a compound capable of reacting with an oxidation product of...
US-4,073,580 Fade photographing control apparatus for cine camera
A fade photographing controlling apparatus for a cine or movie camera comprises a rotary member adapted for alternate rotation through 180.degree. in a first...
US-4,072,973 Camera signal system for portrait taking
A camera signal system for portrait taking in which a sensory signal alerts animate subjects of photography, such as group-portraiture subjects, at a ...
US-4,072,960 Camera with battery testing device
A camera incorporating a light-meter and a battery-powered lamp for indicng when the level of incident light is so low as to be unsuitable for photography also...
US-4,072,525 Silver halide photographic material containing two-equivalent color coupler
A photographic color coupler in which a hydrogen atom at the coupling position capable of coupling with an oxidation product of an aromatic primary amine...
US-4,072,522 Method of treating photoconductive zinc oxide
Electronic-photography light-sensitive material provided with a light-sensitive material layer suitable for rendering of continuous gradation of tones.
US-4,071,850 Camera lens barrel suitable for flash photography
A camera lens barrel suitable for flash photography, wherein flash guide numbers are marked either on the distance adjusting ring or the diaphragm value...
US-4,070,191 Silver halide emulsion containing colored magenta coupler for photography
A coloured magenta coupler for photography is disclosed which is represented by the following general formula: ##STR1## wherein R is substituted phenyl,...
US-4,068,931 Reflector including light filter for photographic use
A filter supporting structure fitted to a reflector and light source for use in photography is shown for positioning the filter medium between the light source...
US-4,068,245 Exposure control system for flash photography
A flash exposure control system comprising a flash lighting unit, a battery circuit connected to said flash lighting unit to energize said flash lighting unit...
US-4,066,346 Motion picture camera with a built in color conversion filter
The present invention relates to a motion picture camera which includes a color conversion filter for adapting the tungsten type film to the daylight...
US-4,063,092 Selective image area control of x-ray film exposure density
A system for accurately determining the exposure density required for x-ray photography of a particular area of interest is provided. The light received from an...
US-4,062,683 Photographic material containing 3-anilino-5-pyrazolylalkylcarbonate or arylcarbonate couplers
3-Anilino-5-pyrazolyl alkylcarbonates and arylcarbonates are described for use in silver halide color photography as color coupler precursor compounds containing...
US-4,061,498 Photographic material containing 2-acyl-2-pyrazolin-5-on-couplers
2-Acyl-3-pyrazolin-5-one couplers are provided for use in color photography which upon color development form 2-pyrazolin-5-one couplers capable of coupling with...
US-4,057,830 Electronic photography system
A completely electronic system for recording and subsequently displaying still life pictures includes an optical-electronic transducer for generating electronic...
US-4,054,453 Lippmann film with reflective layer
A film for use in Lippmann photography is formed with a photosensitive emulsion on a transparent base and a separable reflective layer adhering to the emulsion....
US-4,053,756 Illumination light-source device for an endoscope or the like
A light source for an endoscope includes a lamp for providing conventional illumination, a cold mirror for condensing the conventional illumination onto a light...
US-4,052,607 Versatile light diffuser
A uniquely configured and constructed light diffuser device which is versatile in the sense that it is easily associated with various light sources ubiquitously...
US-4,052,212 Photographic silver halide emulsion containing 2-equivalent cyan coupler
Cyan couplers of the 2-equivalent type, useful in photography are described. These compounds are characterized in that they have at least one divalent group of...
US-4,052,126 Motion picture camera
A motion picture camera having a film transport mechanism driven by an electric motor having an electronic speed control circuit which may be controlled by the...
US-4,051,494 Photographic camera with built-in strobo flash light device
In a photographic camera provided with a built-in strobo flash light device, the distance from the strobo flash tube to the optical axis of the taking lens of...
US-4,051,493 Flash photographing device
In a flash photographing device which comprises a camera body and a flash gun adapted to be connected to the camera body during photography, there is provided a...
US-4,048,540 Electronic flash unit serving both as transmitter of a remote control and flash unit for flash photography
In an electronic flash unit serving both as the transmitter of a remote control device and a flash unit for flash photography, there is provided a power source,...
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