Abstract: A mirror arrangement for reflex cameras is provided. A main mirror is pivotably connected to a steering lever, which is rotatable about a rotary spindle, such that the main mirror is pivoted and lowered during transition into the lower position. A secondary mirror is rotatably mounted to a housing via a pivot arm that is arranged pivotably about a rotary spindle that is fixed to the housing. The rotary spindle of the pivot arm is parallel to the rotary spindle of the steering lever. The mirror arrangement further comprises an actuating lever, which is connected to the main mirror and the pivot arm of the secondary mirror. The actuating lever is configured to provide simultaneous movement of the main mirror and of the secondary mirror from the upper position into the lower position and vice versa.

Abstract: A method for determining the current camera aperture (working aperture) of lenses on digital cameras having a viewfinder eyepiece and internal exposure measurement through the lens is wherein a further external exposure measurement is carried out past the lens and the value of the working aperture is determined from a reference table stored in the digital camera from the difference ?BV between the two measured exposure values BV(int) and BV(ext). A digital camera suitable for carrying out the method wherein outside the region covered by the lens tube, the housing of the digital camera has an additional window for a further exposure meter with an upstream optics that is directed onto the subject and serves to restrict the shooting angle, and includes a memory for a reference table for determining the aperture value.

Abstract: A mirror arrangement for reflex cameras, consisting of a main mirror (2), which can pivot in a housing (4), and a pivotable secondary mirror (6), wherein the main mirror (2) is partially transmissive in a central region (5) and the secondary mirror (6) is arranged downstream of this partially transmissive region (5) in the direction of the light and is matched to this region (5) in terms of its size, and wherein, in an upper position, both mirrors (2, 6) are situated in one plane and, in a lower position, the main mirror (2) is aligned at 45° with respect to the upper position and the secondary mirror (6) is aligned such that it is tilted with respect to the main mirror (2), is characterized in that the main mirror (2) is connected in an articulated manner to a steering lever (19), which is rotatable about a rotary spindle (20), such that the main mirror (2) is pivoted and lowered during transition into the lower position, the secondary mirror (6) is connected to a pivot arm (22), which is arranged pivotably

Abstract: An interchangeable lens connects in a prescribed position to a support surface on a camera of a camera system using a locking apparatus. A method and apparatus for identifying interchangeable lenses uses optical radiation. After the locking operation is performed, a defined optical radiation is directed from two or more, preferably six, light transmitters arranged in the support surface to reflecting or absorbing surfaces on the locking apparatus which are assigned to said light transmitters. The radiation returning from the respective reflecting/absorbing surfaces is picked up by light receivers arranged next to the light transmitters in the support surface. A binary coded signal for identifying the interchangeable lens is formed from the output signals of the light receivers.

Abstract: An interchangeable lens (1) with a locking device (2, 2?) for system cameras is described, wherein an orientation marking (4) for mounting the locking device (2, 2?) on the camera is provided at the end of the lens housing (3) facing the camera, and the contact surface (6) of the locking device (2, 2?) has a latching depression (8) at a distance from the orientation marking (4) counter to the direction (7) of rotation of the locking operation and the contact surface (6) contains at least two, preferably six, surface areas (10) which are situated next to one another in an isolated fashion at a distance from the latching depression (8) counter to the direction (7) of rotation within an angle segment of from 100° to 160°, preferably 110° to 150°, and can be detected individually by optical means.

Abstract: A method for determining the current camera aperture (working aperture) of lenses on digital cameras having a viewfinder eyepiece and internal exposure measurement through the lens is wherein a further external exposure measurement is carried out past the lens and the value of the working aperture is determined from a reference table stored in the digital camera from the difference ?BV between the two measured exposure values BV(int) and BV(ext). A digital camera suitable for carrying out the method wherein outside the region covered by the lens tube, the housing of the digital camera has an additional window for a further exposure meter with an upstream optics that is directed onto the subject and serves to restrict the shooting angle, and includes a memory for a reference table for determining the aperture value.

Abstract: A description is given of a method for identifying interchangeable lenses (1) that can be connected with the aid of a locking apparatus (2) in a prescribed position to a support surface (9) on a camera of a camera system, wherein after the locking operation is performed a defined optical radiation is directed from two or more, preferably six light transmitters (18) arranged in the support surface (9) to reflecting or absorbing surfaces (8) on the locking apparatus (2) which are assigned to said light transmitters, the radiation returning from the respective reflecting/absorbing surfaces (8) is picked up by light receivers (19) arranged next to the light transmitters (18) in the support surface (9) and a binary coded signal for identifying the interchangeable lens (1) is formed from the output signals of the light receivers (19). Also described is an apparatus for carrying out the method.

Abstract: An interchangeable lens (1) with a locking device (2, 2?) for system cameras is described, wherein an orientation marking (4) for mounting the locking device (2, 2?) on the camera is provided at the end of the lens housing (3) facing the camera, and the contact surface (6) of the locking device (2, 2?) has a latching depression (8) at a distance from the orientation marking (4) counter to the direction (7) of rotation of the locking operation and the contact surface (6) contains at least two, preferably six, surface areas (10) which are situated next to one another in an isolated fashion at a distance from the latching depression (8) counter to the direction (7) of rotation within an angle segment of from 100° to 160°, preferably 110° to 150°, and can be detected individually by optical means.

Abstract: A shutter for a photographic camera, having a first and a second pretensioned shutter curtain which are respectively retained in the tensioned state by a first and a second pivotably mounted retaining latch (7, 11) in interaction with a first and second curtain latch (3, 4), the first retaining latch (7) being coupled to a camera release for enabling release of the first curtain, and the second retaining latch (11) being coupled to a release device, which is controlled as a function of the release of the first curtain, for enabling release of the second curtain, wherein the first and second retaining latches (7, 11) are respectively assigned first and second movement-releasing active surfaces (9, 10; 13, 14) which are each coupled either to a mechanically controlled or an electronically controlled curtain-release enabling arrangement.

Abstract: A switchable flap valve having at least one valve plate (2, 2a, 2b) disposed for pivoting about a longitudinal axis in a housing part (1) for opening or closing a valve opening (11) provided in the housing part (1) in which a strip element (4, 4a, 4b) is formed on the upper side of the valve plate (2, 2a, 2b) aligned parallel to the longitudinal axis of the valve plate. The surface of the strip element (4, 4a) is inclined toward an adjacent housing wall (20) or toward a second strip (4b) and forms a hollow channel with the housing wall (20) or with the strip (4b). The free longitudinal edge (18) of the strip (4, 4a, 4b) is held in a latch mechanism (7, 8) to maintain the valve plate (2, 2a, 2b) in the closed position.

Abstract: A shutter for a photographic camera, having a first and a second pretensioned shutter curtain which are respectively retained in the tensioned state by a first and a second pivotably mounted retaining latch (7, 11) in interaction with a first and second curtain latch (3, 4), the first retaining latch (7) being coupled to a camera release for enabling release of the first curtain, and the second retaining latch (11) being coupled to a release device, which is controlled as a function of the release of the first curtain, for enabling release of the second curtain, wherein the first and second retaining latches (7, 11) are respectively assigned first and second movement-releasing active surfaces (9, 10; 13, 14) which are each coupled either to a mechanically controlled or an electronically controlled curtain-release enabling arrangement.

Abstract: Screw mechanism having a spindle (1) which is secured in the axial direction and has a spindle axis (1′), and a spindle nut (5) which is connected to a slide (7) which can be driven and is guided in the axial direction, a joint being provided between the spindle nut (5) and the slide (7) in order to compensate for relative transverse movements and tilting between the spindle nut (5) and slide (7), said joint being formed symmetrically to the spindle axis (1′) and having two joint axes which are perpendicular to each other, intersect on the spindle axis (1′) and are assigned at one end to the transverse movement of a bearing plate (6), which is connected to the spindle nut (5), and at the other end to the transverse movement of a bearing plate (8), which is connected to the slide (7), and said joint containing an intermediate plate (9) via which the bearing plates (6, 8) are connected pivotably to each other in order to compensate for any tilting of their joint axes.

Abstract: A switchable flap valve having at least one valve plate (2, 2a, 2b) disposed for pivoting about a longitudinal axis in a housing part (1) for opening or closing a valve opening (11) provided in the housing part (1) in which a strip element (4, 4a, 4b) is formed on the upper side of the valve plate (2, 2a, 2b) aligned parallel to the longitudinal axis of the valve plate, The surface of the strip element (4, 4a) is inclined toward an adjacent housing wall (20) or toward a second strip (4b) and forms a hollow channel with the housing wall (20) or with the strip (4b). The free longitudinal edge (18) of the strip (4, 4a, 4b) is held in a latch mechanism (7, 8) to maintain the valve plate (2, 2a, 2b) in the closed position.

Abstract: A device for exposure metering in photographic cameras including a reflector located in the imaging beam path. The surface of the reflector is provided with a reflecting structure whose size corresponds at least approximately to that of the image recording format. At least one photoelectric receiver records the light intensity of a portion of the image reflected from the reflecting structure. The reflector is pivotally mounted in the camera housing such that during exposure metering the reflector surface is in the vicinity of the film plane of the camera. A limited portion of the reflector is transparent and a photoelectric receiver is set into the backside of the reflector behind the transparent portion.

Abstract: A UV-curable composition suitable for coating polycarbonate molded articles is disclosed. Accordingly the composition containsA) from 10 to 100% by weight of a polysiloxane which contains epoxy groups and is free from OH groups, and optionallyB) from 0 to 90% by weight of compounds other than A) which also contain epoxy groups and are free from OH groups, and/or optionallyC) from 0 to 40% by weight of compounds which are free from epoxy groups but contain hydroxyl groups, where components A)+B)+C) add up to 100% by weight, together withD) from 0.1 to 15% relative to the weight of A+B+C of photoinitiators and optionallyE) from 0 to 0.5% relative to the weight of A+B+C of sensitizers.In accordance with the invention , the composition is applied to the moldings of thermoplastic polycarbonates and then cured.

Abstract: A photographic camera with a driving mechanism for setting of the diaphragm of the camera lens, typically an interchangeable lens unit, having a stopping device which stops the driving mechanism, wherein the focusing error resulting from the inertia of the moving parts are eliminated or reduced to an insignificant value. An armature plate is movably mounted at the side of a stop band opposite magnet poles of an electromagnet of the stopping device, with the stop band between the magnet poles and the plate, the movement of the armature being substantially crosswise to the direction of motion of the stop band. The stop band was very small dimensions, being preferably reduced to a size limited by its mechanical strength. The stop band is directly and fixedly connected to the driving mechanism and the plate bears with a small initial stress against the stop band.

Abstract: The present invention relates to a clear and transparent, scratch-resistant and weather-resistant laminate of high impact strength, consisting of a polycarbonate layer which, on at least one of its surfaces, carries a polyacrylate coating which, on its outer surface, is coated with a scratch-resistant and weather-resistant covering of a hydroxylated fluoropolymer which is cross-linked with methylmelamine and/or polysilicic acid. The present invention also relates to a process for the production of said scratch-resistant laminate.