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Alkali metal dichromate as memory resistance improver for zinc oxide
photoconductors in electrostatic photography
A process for preparing a photosensitive material for electrostatic photography having an improved memory resistance, which comprises a photoconductive layer on...
Camera with the shutter time control circuit for the flash light
The present invention relates to a shutter time control circuit of the type in which the shutter time is changed over into a predetermined value for flash light...
Device for indicating condition of exposure in an automatic control type
electronic flash unit for flash...
An automatic control type electronic flash unit includes flashlight generator, a metering device for measuring the quantity of light emitted from the flashlight...
Diaphragm control device for flash photography
A diaphragm control device for flash photography is incorporated in a programming electric eye camera including an exposure control circuit and capable of...
X-ray diagnostic generator for the purpose of fluoroscopy and photography
In a fluoroscopic and photographic exposure installation where photographic exposure high voltage is normally automatically derived from the voltage setting...
Zoom lens barrel capable of macro-photography
The disclosure describes a zoom lens barrel capable of macro-photography on which a special switch ring is provided. The switch ring is externally operable and...
Aerial photography camera mount assembly
An assembly for mounting, supporting and releasably holding a vertically positioned aerial photography camera, and an angularly adjustable obliquely positioned...
Carrying pack for photography equipment
A flexible bag has a triangular bottom panel provided with openings at its vertices for receiving the legs of a tripod. Side panels of the bag surround the...
Novel antifogging and/or stabilizing compounds for silver halide
Photographic silver halide material developed in the presence of a novel antifogging or stabilizing compound which is present in the material and/or in the...
Three dimensional camera having lenticular screen moving apparatus
A photographic camera for three dimensional photography. A housing has an opening to the interior for light rays. The photosensitive material is immovably...
Magnetic dry developer for electrostatic photography and process for
A magnetic toner for electrostatic photography consisting essentially of spherical particles of a composition comprising a fine powder of a magnetic material...
Camera for taking three dimensional photographs having screen moving
A photographic camera for three dimensional photography. The photosensitive material is positioned at a fixed location during the exposure cycle of the camera....
Photographic camera for taking three dimensional photographs and method
and apparatus for forming trivision images
A photographic camera for three dimensional photography on fixedly positioned photosensitive material. A screen having a plurality of lenticular elements with...
Liquid developer for use in electrostatic photography comprising natural
resins and natural resin-modified...
A liquid developer for use in electrostatic photography which comprises at least one kind of resin which is substantially insoluble in a carrier liquid...
Optical scanning equipment
Line-scanning equipment, especially for aerial photography of terrestrial scenes, has an infra red scanner which causes the scanning beam to sweep repeatedly...
Indicating devices for use in cameras
A camera adapted for use with a photoflash device, and having structure for manually setting a diaphragm aperture externally of the camera includes: a switch for...
Under-water photographic apparatus
The present invention relates to apparatus for photography under water, and is directed generally to the complete or partial elimination of the fluid-tight...
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...
Method and an apparatus for stereoscopic measurement utilizing a
A method and apparatus for stereoscopic measurement of an actual value of depth in a subject through its three-dimensional image obtained from two ...
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...
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...
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...
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...
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...
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...
Electronic photoflash unit having remote control device transmitter
Electronic photoflash unit has functions as a remote control device transmitter and as photoflash for flash photography. The photoflash unit decreases the amount...
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...
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...
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...
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...
System and camera for controlling depth of field in three-dimensional
In the exemplary embodiments of the invention disclosed, a system especially adapted for producing stereoscopic pictures in general photography includes a camera...
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...
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...
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...
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...
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...
Flash and camera apparatus having a plurality of flash and daylight
Flash and camera apparatus integrally incorporating an electronic flashing device for firing a flash discharge tube and a photographic camera device with a fixed...
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....
Magnetic developer for electrostatic photography and process for
A developer for electrostatic photography comprising as indispensable components a fine powder of a magnetic material and a binder resin, said developer...
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...
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...
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...
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...
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...
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...
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...
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 ...
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...
Silver halide photographic material containing two-equivalent color
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...
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.