Abstract: An exposure indicator which is attachable to a hinged glass mask cover frame, the indicator comprising a light emitting diode having one end lead connected in series through a light sensitive cell; a sensitivity-controlling resistance and switch to the appropriate pole of a source of electrical potential, such as a battery, the other pole of the battery being connected to the other end lead of the diode; the switch being arranged so that it is closed when the glass mask frame is closed against the blanket frame on which there is loaded a light-sensitive printing plate, and onto which an activating light is adapted to be directed, whereupon the light-sensitive photo cell is activated (resistance decreased) so that current is allowed to flow from the battery, through the switch and the light-activated silicon controlled rectifier, causing the diode to glow, thus indicating that the material has been exposed, and thereby preventing a second exposure due to the inattentiveness or forgetfulness of the operator.

Abstract: An automatic prereader for exposed and developed frames of a web of spliced-together photographic color films is preceded by a first station and followed by a second station at the first of which groups of successive frames are subjected to a first subjective examination by an attendant and at the second of which some of the frames are subjected to renewed subjective examination by the same attendant. The attendant actuates one or more pushbuttons upon examination of frames at the first station to produce signals which denote improperly oriented frames, frames which were exposed in artificial light and/or frames which are unfit for copying. Such signals are used to modify signals which are furnished by the automatic prereader.

Abstract: A high speed, photographic optical printer, for making duplicates of a master motion picture film, wherein the overall exposure and the color balance of the copy film can be automatically controlled and are continuously adjustable over a wide dynamic range by means of electro-optical modulators, such as PLZT ceramic devices, in the light path between the light source and the copy film, and an electric circuit connected to each electro-optical modulator for controlling their transmissivity. In another embodiment, overall exposure is controlled by controlling the electrical energy applied to a pulsed xenon source that is turned on once for each frame.

Abstract: A frame count cuer for controlling the operation of a continuous photographic film printer either of the continuous motion or incremental motion type. As the "preprint" film and the overlaying "raw stock" are passed through the printer, a signal is generated corresponding to the quantity and direction of travel of the film drawn across the exposure aperture. A counter is incremented or decremented by the signal and provides an integral footage and frame count of the amount of film passing through the printer. The information from a punched scene length tape is used to set a storage unit to the desired scene length and the setting of the storage unit is compared with the counter by a coincidence detector. Upon coincidence, a cue signal is fed from the coincidence detector to the printer light valve control unit. The light valves are preset with the information obtained from a punched paper tape in accordance with the predetermined preferred light level and the hue for the scene to be printed.

Abstract: A printer for exposing photographic material is shown with a printing table horizontally mounted within a cabinet to receive photosensitive material and copy. A transparent plate is pivotably attached to hold the photosensitive material and copy in contact above the table which may be of the vacuum type. The front of the vacuum table may or may not exceed beyond the front of the cabinet. A fixed panel may be provided to support an exposing light above the table, additionally the control panel and shutter mechanism may be part of this fixed panel. A movable plate at least partially opaque to actinic rays may be moved inwardly as the transparent plate is raised. A safelight, viewing or inspection light may be mounted within the cabinet. A lifting and latching handle may be mounted at the front edge of the transparent plate.

Abstract: A contact exposure unit having a transparent contact surface and a liquid development unit having means for preventing leakage of a developer are, respectively, constructed as independent units. The exposure unit and the development unit are adapted to be releasably combined with each other thereby to form a portable copier. Outer housings of the exposure and the development units constitute in combination the housing of the portable copier.

Abstract: A control unit for a photographic film printer for printing motion picture film onto raw stock from a master preprint film. The operation of various functions of the printer such as color changes, fades, and the like, are controlled in accordance with a control tape bearing information for the control of the various components. Various cue signals indicating where the desired controls are to be effective during the printing process are provided by a notch or RF patch system, a separate frame counting system utilizing a separate film address information tape, or an integral frame counting cuing system wherein the film address information is provided on the same control tape with the control information.

Abstract: Method and apparatus for printing photographs comprising a plurality of memories for storing information comprising frame numbers and the number of pictures to be printed for a particular frame number. Means for obtaining the information stored and for printing a predetermined number of copies therefrom are also provided, along with exposure means for exposing the negative.

Abstract: Variation in the width of the shutter opening in a motion picture film copying machine is rapidly effected to control the amount of light passed through the shutter for transmission of the image from the master film onto the blank sensitized film running in registry therewith. Such rapid change in size of the opening in the shutter is effected by presetting the predetermined fixed extent of opening or closing of the opposed shutter halves in advance and shifting these halves to the scheduled predetermined position on signal from a sensor associated with the moving master film strip.

Abstract: This invention relates to a process for automatically changing the illumination intensity of a light source in a copying apparatus in which the transparency of the original is measured with at least one light-sensitive measuring unit and in which, based on the measured transparency, a signal is passed on from this measuring unit for controlling the speed of a drive motor, comprising comparing the signal coming from the light-sensitive measuring unit and passed on for controlling the speed of the drive motor with a predetermined signal corresponding to the highest speed of the drive motor and, if the measured signal requires a higher speed than that of the predetermined signal, the difference of the two signals is formed and the illumination intensity is controlled in correspondence with this difference signal. The invention also relates to an apparatus for performing the process.

Abstract: Three measuring channels in a photographic color printing and enlarging apparatus are utilized for determining the filter values of the primary colors. The exposure time is determined by adjusting and reading the amplification factor of an amplifier which amplifies the signal of a light-voltage transducer containing a photoelectric element, which obtains its input from a measurement of each of the three primary color components in the printing light. The light-sensitive element of the photoelectric element has a characteristic curve which is linearly related to the intensity of illumination and it is preferably a photodiode. The light impinging on the photodiode is modulated by an electromechanical light-chopping device and the measuring signal is controlled by a zero-regulator. The light-sensitive element, the zero-regulated device, the light-chopping device and filter controlling device are miniaturized and fitted into a light-measuring probe.

Abstract: An original bears a pictorial image, or the like. The original is illuminated with first and second light and the image on the original is projected onto a copy carrier. The spatial variation of the intensity of the first light after the first light has been modulated in intensity by the image on the original is detected. The contrast of the image projected onto the copy carrier compared to the contrast of the image on the original is changed by changing the spatial variation of the second light in dependence upon the detected spatial variation of the intensity of the modulated first light.

Abstract: Each correction factor can assume one of a plurality of values and the selected value is to be stored in the printing apparatus. A plurality of input keys is provided, each furnishing a selected value upon activation. Activation of the key applies the input signal signifying the chosen value to the storage inputs of a plurality of storages, one for each correction factor. Further, activation of each key advances a counter by one step. The counter output enables each of the storages in turn.

Abstract: A contact copying device includes first and second plates which are spaced from and substantially parallel with each other, one of the plates having a slot therein. A pair of pickup rollers are provided for feeding superposed films, one of which is unexposed and sensitized, and the other of which includes information thereon which is to be exposed onto the unexposed film. The feed rate of the films past the slot is controlled and varied in accordance with the amount of light required to expose the sensitized film by a source of electromagnetic energy spaced from the slot.

Abstract: An automatic exposure system for a copying machine which includes a scanning optical system having a prescan period, comprising a lamp illumination control to receive light reflected from an original document to be copied, a lamp illumination control circuit and a synchronizing circuit, said control loop being arranged to adjust the illumination provided by the lamp means during the prescan period to maintain the intensity of light being received by an image forming surface from the original document at a predetermined level.

Abstract: An exposure control apparatus for use in photographic printers assigns the originals which are received for printing to groups or sets, for example, according to filmstrip membership, and bases the printing exposure for each such original, at least in part, on characteristics determined for a corresponding set taken as a whole. In a presently preferred apparatus, the exposures for individual frames from a filmstrip are controlled in accordance with the average optical density for the overall filmstrip in selectively weighted combination with individual frame, optical density characteristics.

Abstract: A device for recording a cathode-ray tube image comprising means for detecting temperatures of a thermal developing device and means for controlling either brightness of the cathode-ray tube or light emission time or a combination thereof. The change in developing temperature may be corrected by electrical means. The device provides prints of uniform density.

Abstract: Apparatus for graphic arts plate making suitable for exposing diazo plates and the like. A unit providing an exposure bed with a plurality of lamps close to the negative and plate and operating in the ultraviolet region, and another plurality of lamps in the visible light region with a diffused glass top for a work table and for fixing an exposed plate. Separate control units for each exposure lamp to provide uniform radiation from all lamps to the plate.