摘要:
A cassette for light-sensitive photographic material which is to be transferred between the cassette and a copying apparatus having one or more doors which can be opened and closed. The cassette has a housing provided with an open side which can be closed by a removable cover, and it also has a wall provided with a slot connectable to an opening of the copying apparatus. A pair of rollers is mounted inwardly adjacent the slot and at least one of these can move towards and away from the other roller between one position in which the rollers define a gap for passage of the photographic material and another position in which the rollers bear upon each other and form a seal against the entry of light from the slot into the cassette. An arrangement is provided which automatically moves the movable roller into the sealing position in response to placement of the cover on the open side and another arrangement automatically moves the movable roller to the gap-defining position in response to closing of the door or doors of the copying apparatus to which the cassette is connected.
摘要:
A photographic processor wherein parallel webs consisting of photosensitive material and/or other material and having identical or different widths are transported lengthwise through one or more liquid baths each of which receives identical quantities of replenishment chemicals at a frequency which insures that the activity of the baths remains unchanged. The device which feeds replenishment chemicals is controlled by a circuit having two inputs one of which receives first signals at a frequency corresponding to the rate of transport of unit lengths of the webs through the bath or baths and the other of which receives cyclically second signals, one for each photosensitive web and each persisting for a period of time which is proportional to the width of the respective photosensitive web. The control circuit causes the feeding device to admit a predetermined quantity of replenishment chemicals in response to the generation of each first signal during the persistence of a second signal. First signals are generated on closing of a microswitch which is actuated by a loop former associated with one of the webs and moving up and down at a frequency which is proportional to the speed of the corresponding web. Second signals are generated by a photoelectric cell which is moved at a constant speed back and forth transversely of the paths of webs and whose transducer reacts only to light which is reflected by a photosensitive web.
摘要:
A camera has two or more different photographic lenses which are mounted for displacement transverse to the optical axis of the camera, so that each lens can be moved into and out of an operative picture-taking position. An arrangement is provided which imparts to at least one of these lenses a component of movement in direction longitudinally of the optical axis in automatic response to the movement of this lens to said picture-taking position.
摘要:
The strip of originals to be copied is transported, prior to copying, through an evaluation station. There, the originals are evaluated with respect to density, color, copiability, or the like. A discrete strip-shaped information carrier is connected to the strip of originals and runs along the length of the strip of originals. The connection is effected either upstream of the evaluation station or at the evaluation station. Information derived from the evaluations performed at the evaluation station is entered upon the information carrier alongside the associated ones of the originals.
摘要:
A still camera has a housing adapted to hold a roll of film having a succession of frames. An openable shutter is provided on the housing alignable with the film and a takeup wheel in the housing is connectable to the roll of film and rotatable to wind the film up and displace the frames one-by-one past the shutter. A film-advance slide is displaceable on the housing between a pulled-out position projecting from the housing and a pushed-in position fitting snugly with the housing. A transmission and a one-way coupling are provided in the housing between the slide and the take-up wheel so that the take-up wheel is rotated to wind up the film only on displacement of the slide from the pushed-in position to the pulled-out position. Furthermore, a frame-sensing mechanism in the camera arrests displacement of the slide or a portion of the slide in the direction toward the pulled-out position when a fresh frame is properly aligned with the shutter.
摘要:
Copolymers of methylacrylate/alkyl acrylate or methyl methacrylate/alkyl methacrylate are used as a binder for UV-sensitive recording materials, preferably recording materials which contain substances which are capable of discoloration.
摘要:
The strip of originals is transported through an evaluating station where the originals are evaluated with respect to density, color, copiability, or the like. Information indicative of the results of these evaluations is manually entered upon a strip-shaped first information carrier in spatial coordination with the originals of the strip. Thereafter, at another location, the information on the first information carrier is transferred to a second information carrier. The strip of evaluated originals is then transported to a copying apparatus and there copied in accordance with the information on the second information carrier. The strip of originals itself can be utilized as the second information carrier.
摘要:
An adapter effects delayed firing of an electronic flash unit in response to activation of a photographic camera of the type provided with a striking member which otherwise serves to effect firing of impact-fired flash bulbs. The adapter includes a housing configurated to be mounted on such a camera with a predetermined position relative to the striking member of such camera. Inside the housing an inertial body is mounted for swinging movement about a predetermined axis. A biasing arrangement urges the inertial body in a predetermined direction. A synchronizing switch device is activatable by the inertial body when the latter assumes a predetermined activating position, for effecting firing of an electronic flash unit. The inertial body is so located relative to the mounting portion of the housing as to be set into motion against the force of the biasing arrangement by the striking force of a striking member on a camera to which the adapter is connected. When so set in motion the inertial body describes a predetermined path of movement in which it reaches the activating position.
摘要:
A light-sensitive photographic silver halide material containing hompolymers or copolymers of 1,3-dihydroxy-2-methylene-propane or derivatives thereof which have an advantageous stabilising effect on the photographic properties of the silver halide emulsion layers.
摘要:
An enlarger for vesicular-image negatives comprises a light source, a condenser for illuminating the vesicular-image negative and an enlarging lens. Diffuser discs differing from one another in their diffusion characteristics are introduced between the vesicular-image negative and the condenser. In this way, the optical density and hence the gradation of the vesicular-image can be varied within wide limits.