Abstract: A film cassette including a base and a cover, two lock and release slides selectively movable for locking the cover to the base in a closed position and for releasing the cover from the base in an open position, and a linkage for linking the two slides together such that when forces arise on the two slides when a jolt is experienced, the forces on the two slides act against one another. In this way, the chance of such forces leading to movement of the two slides is reduced.

Abstract: The exposure control of a photographic copying machine has several detectors which are exposed to surrounding light as well as to original-modulated copying light to transmit first signals which denote the color composition and/or density of originals. The influence of surrounding light upon the first signals is compensated for by discrete circuits which generate and store second signals corresponding to those portions of first signals which are attributable to the influence of surrounding light upon the respective detectors. The second signals are subtracted from first signals during exposure of an original to copying light whereby the resulting third signals denote the color composition and/or density of the original as if the detectors were not exposed to surrounding light.

Abstract: An electrostatic charge is applied to a charge carrier and the latter is thereupon contacted with one side of a sheet-material copy carrier. Thereafter, an original is imaged onto the charge carrier to produce thereon a latent electrostatic image field which penetrates the copy carrier, whereupon the latent image is developed on the copy carrier by contacting the other side thereof with developer material.

Abstract: White couplers which are capable of reacting with color developer oxidation products to form colorless end product with the consumption of four oxidation equivalents and which, therefore have increased absorption capacity for color developer oxidation products correspond to the formula ##STR1## or its tautomeric form, in which R.sup.1 is hydrocarbyl, heterocyclyl attached through a ring carbon, or --CO--R.sup.2R.sup.2 is alkyl, aryl, alkoxy, aminoX is --S-- or --NR.sup.3 --R.sup.3 is hydrogen, same as represented by R.sup.1 or an electron-attaching group.The four-equivalent white couplers may be contained in processing solutions or, in diffusion resistant form, in one or more layers of a colorphotographic material.

Abstract: An electrostatic copier has a rotatable copy drum and a developing unit which can be inserted and removed from the copier in toto. The developing unit is provided with bearing members which at least partly and loosely embrace the shaft of the copy drum.

Abstract: When the user presses the trigger button, a rod is pulled longitudinally by a drive spring in a first direction from a first to a second position triggering the shutter in the process and a coupling thereafter couples the rod to a transport motor which returns the rod in the opposite second direction back to first position, the rod resetting the shutter in the process, the rod when returned to second position becoming decoupled from the motor so that the latter will not oppose the force of the drive spring for the next first-direction movement of the rod. The crank rod is blocked against first-direction movement by two blocking levers, the first initially being in blocking position and the second initially in unblocking position.

Abstract: A lamp of low ozone generation is used as the flash lamp, to minimize the amount of ozone reaching the machine exterior. A first cooling-air passage includes the space surrounding the flash lamp and its reflector and is provided downstream thereof with an activated-carbon filter, from which is discharged a quite hot first cooling-air stream of low volumetric flow rate. A second cooling-air stream emerging from the electronics compartment of the machine is much cooler and cleaner and of high volumetric flow rate. The first and second cooling-air streams are mixed together, to dilute and cool the first, prior to actual discharge to the machine exterior. The mixed air streams are discharged in downwards direction.

Abstract: When the trigger button is depressed, a crank rod is pulled by a biasing spring in a first direction from a first to a second position triggering the shutter in the process, and an associated crankwheel drives a gear segment coupled thereto to an angular position engaging a motor-driven transmission, which latter then drives the gear segment, crankwheel and thereby the crank rod in an opposite second direction back to first position, the crank rod resetting the shutter in the process, whereupon the gear segment reaches an angular position once more disengaged from the film-transport motor.

Abstract: A motor-driven still camera in which all functions associated with making of an exposure and readying the camera for the next exposure are effected by operation of the motor, and a user need exert only the small force required to close a motor-actuating switch in order to initiate the operation of the camera.

Abstract: A motion picture camera wherein the diaphragm is adjusted in automatic response to signals from two outputs of a digital comparator which receives a first set of signals during each revolution of the shutter at a frequency varying as a function of changes of shutter speed and of changes of scene brightness. The comparator further receives a set of reference signals from a digital selector circuit during normal operation of the camera or from a binary counter when the camera is set for making exposures with fade-in, fade-out or lap dissolve. The counter forms part of a program circuit.

Abstract: The invention relates to a cassette for roll film with a spool-less supply chamber for containing the film and a protective paper strip, a take-up chamber with a spool for taking-up the film and the paper strip, a bridge arranged between the two chambers to form a rear contact surface and a guide for the film and means to retain the end of the film in a desired position.

Abstract: The reproducing apparatus, such as a motion-picture film projector, stops recording medium transport in response to interrupt-transport frame markings on the recording medium and reproduces the thusly marked image frames as still images. Interrupt-transport frame markings are provided at the terminal frame of each motion-picture scene on the recording medium, or at each still-shot image frame on the recording medium, or both. The user of the reproducing apparatus can select automatic reproduction of motion-picture scenes interspersed with automatic still reproduction of still shots, and can additionally select automatic still reproduction of the terminal frame of each motion-picture scene.

Abstract: Useful non-diffusible dye-giving compounds for the photographic dye diffusion transfer process are dye sulfonamides derived from enolamines or endiamines or tautomers thereof. The dye-giving compounds are oxidized by developer oxidation products and subsequently split under the conditions of alkaline development to release diffusible dyes. The compounds are of the following formula ##STR1## in which X is a dye moiety and R.sub.1, R.sub.2 and R.sub.3 have meanings given hereinafter.

Abstract: An improvement in the prevention color-fog and staining in color-photographic materials is obtained by the inclusion of acylamino substituted hydroquinones derivatives. The compounds can easily be synthesized do not crystalize from their dispersions and are not oxidized to colored by-products during development.

Abstract: A still-camera film transport system includes a perforation feeler and cooperating perforation-detecting switch generating a perforation signal. A time-delay circuit initiates a time delay upon the commencement of film transport and generates a time-delay-elapsed signal when the time delay has elapsed. The duration of the delay is greater than the time required for the film transport motor to transport film from the last film perforation to the actual end of the film. A shutter-state switch generates a signal indicating whether the shutter is in set or unset state. A motor-control switch is controlled from the output of a logic-circuit stage which receives the above three signals. During normal operation before the last perforation is passed, the perforation signal is used to generate a deenergize-motor signal, but in dependence upon the shutter-state signal.

Abstract: Apparatus for making holes in a web of photosensitive material which is transported in a copying machine has an electromagnet with a reciprocable armature connected to one leg of a U-shaped carrier. The other leg of the carrier supports a material removing tool which penetrates through the web when the electromagnet is energized. The carrier is held against wobbling by a ball bearing which is connected to its one leg and extends with minimal clearance between two parallel guide faces which are machined into a stationary holder for the electromagnet. The holder has a plate-like extension with a hole which receives the tip of the tool subsequent to penetration of such tip through the web. The tool is normally located at one side of the plane of the web, and the extension is located at the other side of such plane.

Abstract: A photographic apparatus which can accept cassettes for high-speed or lower-sensitivity film has a mechanical or electronic switch which automatically deactivates a light-emitting diode which serves to indicate the intensity of scene light as soon as a cassette for high-speed film is properly inserted into the body of the apparatus. Such cassette further causes a filter to move out of register with the light-sensitive resistor which is in circuit with the diode and is exposed to scene light. The diode is also deactivated if the diaphragm is adjusted to furnish an aperture of maximum or minimum size; alternatively, the diode is deactivated only when the body of the apparatus contains high-speed film and the diaphragm is adjusted to furnish an aperture of maximum or minimum size.

Abstract: A still or cinematographic camera has a zoom lens movable between two focal-length settings. An eyelevel viewfinder is provided. Also provided is an actuating arrangement which is coupled with both the zoom lens and with components of the viewfinder so as to change the image are a visible in the viewfinder as it moves the lens from one to the other of the focal-length settings.

Abstract: An arrangement of a photographic camera, preferably an instant-picture print camera having two light reflecting mirrors between the objective and a rectangular film strip. According to this invention, the angular position between the mirrors is adjusted such that at least one section of the path of travel of light rays between the objective and the large mirror assigned to the film strip forms an oblique angle with an edge of the film strip.

Abstract: The user of a motion-picture camera selects between motion-picture and single-exposure operation, and presses a release member to initiate shooting, letting go of it to terminate motion-picture shooting. Each time the user lets go of the release member, an internal device provides an interrupt-transport marking alongside the just exposed film frame, or phase shifted relative thereto. Alternatively, the interrupt-transport marking is provided the next time the user presses the release member. In this way, the terminal frame of each motion-picture scene, and each and every one of the interspersed single-exposure shots, is provided with an interrupt-transport frame marking. Thus, if the film is run through a reproducing apparatus provided with a marking detector, detection of each interrupt-transport marking during motion-picture reproduction causes the terminal frame of each motion-picture scene, and also each one of the still shots, to be persistently reproduced as a still image.