Abstract: A method and an apparatus for exposing light-sensitive materials, including a first light beam conducted from a light source with the wavelength &lgr;1 to a first exposure point on the light-sensitive material via an optical system. This system has at least one input end and one output end as well as at least one reflecting or transmitting rotating optical element arranged relatively to the optical output end, wherein at least one additional light source generates an additional light beam with a wavelength &lgr;x which is different from &lgr;1.

Abstract: The invention relates to a method and an apparatus for the analysis and correction of colour casts in a digitally represented image. According to a preferred embodiment, the crominance contents of the image may be transformed by use of a Hough-transformation or the like transformation, wherein the line structures in the carthesic system of co-ordinates for the crominance content is transformed to a representation in a Hough-diagram in the form of a polar system of co-ordinates, since such line structure is hereby transformed into a point structure. The Hough-diagram is examined with a view to finding a cell in the diagram which has the highest value and the cell found is saved. subsequently cells are neutralized in the Hough-diagram within a predetermined angular distance, and the Hough-diagram is re-examined with a view to finding that diagram cell which, following neutralization, has the highest value.

Abstract: A method is described for estimating the bone quality of a vertebrate on the basis of two-dimensional image data comprising information relating to the trabecular structure of at least part of a bone of the vertebrate, the image data being data obtained by exposing at least the part of the bone to electromagnetic radiation, the method comprising subjecting the image data to a statistical analysis comprising deriving features from a parametric estimate of a power spectrum and/or deriving features from a transform similar to a distance transform--but in a number of directions.

Abstract: An apparatus for irradiating a section forming an end portion of a length of a sheet-like material comprising a layer containing a photosensitive substance, where the boundary between said section and the rest of the length of material is defined by a divisional line, said apparatus comprising a supporting device defining a concavely curved, substantially circular cylindrical surface part; means for feeding the section in a first direction and into a first position in which the section is in abutting engagement with the cylindrical surface part and extends peripherally along the cylindrical surface part; irradiating means capable of irradiating at least a major part of said layer of said section containing said photosensitive substance and being adjacent to said divisional line; means for moving the length in a second direction substantially opposite to the first direction to a separating position, and separating means positioned at the separating position for separating the irradiated section from the rest o

Abstract: By using a method of removing silver in the form of sparingly soluble silver salt, especially silver sulfide, from a solution containing another silver compound, such as a silver thiosulfate complex in a photographic fix or rinsing fluid by precipitation, the solution is subjected to electromagnetic irradiation with a wavelength below 375 nm. The irradiated liquid is led through a filter-like means 33 which binds the silver sulfide to its surface as crystalline silver sulfide. As a result, the silver sulfide is precipitated and deposited on the surface of the means as solid silver sulfide which in its turns acts as a catalyst for further precipitation and depositing of solid silver sulfide on the surface of the means. By binding the solid silver sulfide to the surface of the means, the required capacity of a possible subsequent filter is reduced.

Abstract: A method for individual transfer of offset printing plates from a magazine in which the plates are supported at their lower edges and stacked with their respective non-coated sides facing upwards, to a receiving table. The receiving table receives each plate with the non-coated side of the plate facing downwards. The uppermost plate of the stack is gripped by a gripping device engaging the non-coated side of the plate in such a manner that the plate is retained by the gripping means during the transfer to the receiving table.

Abstract: A suction table, especially for an exposure station of an apparatus for producing offset plates, and including an upper suction plate with a plurality of openings, which communicate with a suction means so as to firmly attract an offset plate placed on the suction plate during the exposure. The suction table includes furthermore a conveyor causing an offset plate placed on the suction tabe to move along the upper surface of the suction table, a guide member placed at the upper surface of the suction plate and including a guide surface, which forms an acute angle, preferably an angle of less than 45.degree., with the moving direction of the conveyor means, and an end stop for the front edge of the plate when seen in the moving direction.

Abstract: A contact printer for producing graphic material, such as engraving plates, by exposing a metallic surface by means of a light source emitting ultra-violet light. The light source is situated in a box with a lid which can be tipped up. Inside the box, a vacuum frame is provided which can be tipped down from a horizontal position below the lid to an inclined position for the exposure. The resulting apparatus is very compact, and simultaneously, an almost uniform exposure over the entire metallic surface is achieved.

Abstract: A filter for filtration of fluids includes a filter cloth arranged in a housing with an inlet and an outlet. An acoustic field produced by an acoustic transducer, can act on the filter cloth. The invention the filter cloth is arranged substantially in a pressure node, i.e. a velocity antinode, of the acoustic field. As a result, a relatively inexpensive filter is obtained which is economical to operate due to the long durability of the filter.

Abstract: The ultrasound detector for a thin film includes an ultrasound transmitter and an ultrasound receiver. It is generally known that a plastic film introduced into a sound field attenuates the field to a greater or lesser degree. A sound wave of a frequency of e.g. 40 kHz has a wave length of approximately 9 mm in air. When a plastic film of a thickness of, e.g., 0.50-0.10 mm is introduced, the sound field is typically attenuated with 6-20 dB. The the ultrasound detector is formed as a resonator, and the distance between the transmitter and the receiver corresponds substantially to an integral multiple of one half of a wave length. As a result, the obtained sound field is stronger than previously and the attenuation caused by a plastic film between the transmitter and the receiver is higher than previously. Furthermore, the ultrasound frequency is scanned for taking tolerances, such as changes in temperature and humidity of air into account.

Abstract: An apparatus for scanning a transparent platen including a relatively rigid plate of transparent material. In use, an original document sheet from which data are to be acquired by examination of the document through the plate is retained against the bottom side of the rigid plate of transparent material, by suction, which is applied to the interface between the original document sheet and the plate about the perimeter of the original document sheet, near the outer the edge of the relatively rigid plate. Alternatively, the original may be placed on an exchangeable, elastic support plate of transparent material retained to the relatively rigid plate by suction. Since the support plate is removable, it can be mounted on a light board, thus allowing a digitizer to determine the area to be scanned. The support plate is preferably rather thin so that it can sealingly abut originals of varying thickness.

Abstract: A method of eliminating cushion distortion when adjusting reproduction equipment comprising a picture plane, an objective plane, and an original plane. The cushion distortion results optionally from a glass plate being inserted in the path of the rays. The invention is based on the principle that the direction of light is the same irrespective of the direction in which the light moves. By employing this principle a cushion distorted picture can be reproduced as an undistorted picture if an additional glass plate of a suitable thickness is inserted in the path of the rays. The additional glass plate must, however, be situated on the opposite side of the objective. A glass plate supporting the light-sensitive material is not quite plane either which per se can result in a certain degree of cushion distortion. Such a distortion can also be eliminated by the insertion of an additional glass plate in the path of the rays.

Abstract: A reproduction camera comprising a picture plane, an original plane and an objective plane, whereby the original plane is exposed by means of at least one elongated light source preferably situated below said original plane and optionally scanning at a varying velocity. The light source is turned during the scanning procedure in such a manner that it is directed towards the objective. Preferably, the elongated light source situated below the original plane comprises at least one reflector, at least a portion of said reflector being turnable during the scanning procedure in such a manner that the light reflected is always directed towards the objective. As a result a better utilization of the light is obtained. Preferably, the reflector is shaped in such a manner that a uniform beam is obtained within a predetermined angle, whereby the light source need not be turned during the scanning procedure.

Abstract: A method for obtaining digital data from an original, whereby the original is scanned in longitudinally successive, transversally extending strips by a semiconductor camera comprising a plurality of semiconductor elements arranged in series. The semiconductor camera is guided across the original or across a glass plate covering the original, in a transversely arranged, longitudinally displaceable portal-shaped supporting device. Distance between the original and the camera is maintained by moving the camera directly across the original or the glass plate covering the original, respectively. This method allows an exact adjustment of the distance between the camera and the original, although the intermediate glass plate may not be quite planar.

Abstract: A device for achieving a substantially uniform distribution of the light in the picture plane of a reproduction camera by providing a suitable distribution of the light in the original plane (8), whereby the desired distribution of the light in the original plane is obtained by means of illuminating means comprising adjustable screening members (12). According to the invention the screening members are adjusted by means of a computer in response to the desired enlargement. A light sensor adjacent the picture plane compensates automatically for the influence of the screening members on the main exposure.

Abstract: An area exposure machine for reproduction equipment and comprising an oblong light source (1) and a reflector behind the light source. The reflector is shaped substantially as an involute curve. As a result a uniform exposure of a relatively large area can be achieved, and the distance between the light source (1) and the area to be exposed can be reduced. As reflections towards the light source are avoided the consumption of energy can also be reduced. The reflector is advantageously composed of planar surfaces approximating an involute curve, and each planar surface is advantageously wedge-shaped whereby a more uniform exposure is obtained. The area exposure machine can for instance be used in connection with a contact printing box.

Abstract: A developing tray for feeding a sheet of positive material and a sheet of negative material through a bath of developer, above which bath a lid is mounted for reducing the evaporation of developer, feed rollers being provided at both the input opening and the output opening, and whereby the bottom of the tray is provided with ribs extending substantially in the feed direction of the sheets. The length of the developing tray is primarily determined by the fact that a predetermined developing time is necessary. Furthermore the material in question must be fed through the bath at a predetermined speed in order to ensure a predetermined turbulence in the developer. The bath must therefore be of a certain minimum length. A problem is therefore caused by small sheets unable to reach the rollers at the output opening. The same developing tray also can be used in connection with light sensitive materials of a small size, e.g.

Abstract: A developing tray for feeding a sheet of positive material and a sheet of negative material through a bath of developer. A lid is mounted above the bath for reducing the evaporation of developer. Feed rollers are provided both at the input opening and at the output opening. The bottom of the tray is provided with ribs extending substantially in the feeding direction of the sheets. A wetting roller at the output opening is actuated by the feed rollers and is partly immersed in the developer. The evaporation from the output rollers and the wetting roller thereby provides a cooling compensating for the heat produced by the motor during the developing process. In this way a substantially constant temperature is maintained in the bath without special temperature adjusting devices as the cooling is proportional to the period of operation of the motor.

Abstract: A reproduction camera comprises a supporting frame with an original plane, an objective plane, and a picture plane, the planes being mutually displaceable, and a roll delivering a sheet of light-sensitive material, as well as a conveyor means. According to the invention it is shown how the reproduction camera can be controlled by means of one handle, and according the invention said advantage is obtained by the delivery of a desired length of light-sensitive material from the delivery roll being controlled by means of a first pair of rollers, whereas the transport to the picture plane is controlled by means of an overlying and optionally opaque conveyor band with one or more suction cups. These suction cups are activated in the moment the cutting is performed whereafter the transport to the developer is performed by means of the conveyor band.

Abstract: A suction film holder for a reproduction camera is formed by a flexible cover in the form of a conveyor band. One or more suction cups and a plurality of transverse grooves are provided in connection with the flexible cover. During the exposure of a sheet of light-sensitive material the transverse grooves tightly abut longitudinal grooves along the rim of an underlying glass plate, the grooves in the glass plate being connectable to an evacuation system.According to a particularly preferred embodiment air is blown inwards below the flexible cover upon the exposure. In this manner the time for loosening the flexible cover from the underlying glass plate is reduced to 5-10 secs. The blowing in occurs automatically when the vacuum is removed by means of an inflatable membrane in a box situated parallel to a pressurized valve communicating with the vacuum pump. The membrane is thereby blown up by means of vacuum and blows automatically the air inwards below the flexible cover when the vacuum is removed.