Ernst Leitz G.m.b.h.

Ernest Leitz Gmbh

Werner H Holle

Walter Bletz

Knut Heitmann

Ludwig Leitz

Rolf Magel

Apparatus for storing a voltage analogous to an exposure parameter in photographic cameras with an electronic timer and with electric exposure measurement, having the characteristics that an analog-to-digital converter is provided as the storage unit, containing a digital-to-analog converter, the output voltage of which is fed to a comparator wherein this output voltage is compared with the voltage delivered by the exposure meter part. The signal obtained at the comparator output in the case of voltage identity stops the analog-to-digital converter and the voltage remaining at the output of the digital-to-analog converter controls the respective exposure parameter in the camera.

Apparatus for storing a voltage analogous to an exposure parameter in

Exposure control device for a photographic camera wherein, in a part of the exposure control device, electronic means are provided in order to form, from the luminous density of an object, the film sensitivity, and the preselected time, a voltage analogous to a diaphragm setting, and wherein a storage means is provided for storing this value, the improvement comprising the combination of the following features: A. when the camera release is actuated, the diaphragm begins to operate from an initial position corresponding to the maximum diaphragm opening, a diaphragm path meter coupled therewith operating simultaneously with this diaphragm and yielding a value corresponding to the change in aperture; B. means are provided which compare the value produced by the diaphragm path meter with the stored value and, in case of identical values, or compensation of the values, stop the operation of the diaphragm by a stop member; C. furthermore, means are provided which add the remaining difference value between the formed value and the value formed by the diaphragm path meter to the value corresponding to the preselected time; and D. the open time of the shutter is formed by conventional electronic means in correspondence with the value delivered by the time setter, taking the difference value into account.

Exposure control device for photographic cameras

Apparatus for photoelectrically determining the position of at least one focal plane of an image inside an optical instrument comprising an optics for imaging at least one object on at least one spatial frequency filter of an optical image correlator and further comprising a measurement display of the light fluxes filtered through the spatial frequency filter. The apparatus 1-45 for receiving the light fluxes concentrated through optical components 3,4 comprises at least one photoelectric detector system 5, 6, 31, 32. This detector system has at least one row of several detectors 11-15, . . . n, and electrical means 16, 17, 26-28, 33-38 are provided for pairwise interrogation of the photoelectric detectors 11-15, . . . n and also for the analysis of the photoelectric signals generated during the interrogation.

Auto focus with spatial filtering and pairwise interrogation of

An electronic device for storing and indicating illumination parameters and for controlling the exposure time for photographic cameras having an exposure meter and a timer. The exposure meter includes an analog/digital converter with a digital storage part having a plurality of binary stages. These various stages correspond to different intensities of illumination of an object. The timer includes a combination of binary ratio reducers and logic gates and these are adapted to be selected by the analog/digital converter or by manual adjustment. A generator produces impulses which control the timer.

Electronic storage, indicator and exposure time control device for

In an apparatus, an imaging system, at least one optically effective grating and a photoelectric receiver system are employed for determining the relative position of the plane of maximum amplitude of a spatial frequency component in the image of an object. The imaging system produces from light fluxes emanating from the object and traversing different regions of the entrance pupil of the imaging system an image of the object in a first, a second and a third intermediate image plane. The focussing screen mounted in the first plane is used for subjectively observing and focussing the object as well as for transmitting light fluxes to the optically effective grating which defines a given spatial frequency component and which is mounted at least in the vicinity of the second intermediate image plane for commonly modulating and splitting the light fluxes. The photoelectric receiver system generates therefrom electrical output signals used in devices for indicating and adjusting the sharp focussing of the object.

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Wetzlar, Germany

Werner H Holle