Abstract:
An integrated dynamic semiconductor memory has memory cells which are provided in a matrix-like memory cell array and are combined to form units with column lines and row lines. The integrated dynamic semiconductor memory has a decoder for selecting one of the column lines and a sense amplifier which is jointly allocated to all the memory cells in a selected column line. The sense amplifier is connected to a data signal line for the purpose of further processing a data signal from an addressed memory cell. The decoder for selecting one of the column lines and the sense amplifier are provided at the edge and on opposite sides of the memory cell array. By separating the control for selection of the column lines and of the data output path, successive steps in the process of read access can be controlled in a self-adjusting manner by the respective preceding signal.
Abstract:
A dynamic semiconductor memory device of the random access type having an initialization circuit which controls the switch-on operation of the semiconductor memory device and of its circuit components. The initialization circuit supplies a supply voltage stable signal once the supply voltage has been stabilized after the switching-on of the semiconductor memory device. The initialization circuit has an advance detector circuit, which detects a predetermined level state of an externally applied clock control signal chronologically before the supply voltage stable signal is generated and, as a reaction to this, supplies a first enable signal for unlatching the control circuit provided for the proper operation of the semiconductor memory device.
Abstract:
The invention relates to a device for measuring the thickness of thin layers in the low micrometer range, having a measuring probe at an end region of a supporting arm, the measuring pole of which probe can be placed on the surface of the layer, having a damping device at the lower end region of the supporting arm, having a bearing device for the supporting arm and having a drive device, which operates using magnetic forces, for the supporting arm, the bearing device comprising a torsion-spring, the two ends of which are each fastened, transversely to the pivot plane, to their own bearing block (32, 33), and the pivoting movement lying at least essentially in the Hooke's range of the torsion-spring (31), and the damping device operating on the principle of eddy-current damping.
Abstract:
A long arm bears a probe at its end and is arranged in such a way that it can swivel by small angular amounts. This low-mass and slowly movable system is protected by a protective device from which it emerges only partly during the measuring operation. A lowering device which both decouples and entrains, interacts with a damping element. An article to be measured is pushed onto the protective device, an actuating device is pressed and the probe slowly emerges from the protective device and ultimately rests in a defined manner and with adequately low force on a layer of the article.
Abstract:
A deflecting mirror is in the optical path between a monocular microscope for viewing the region of a layer on which an X-ray beam falls, and the region of a layer, the thickness of which is measured according to the X-ray fluroescence principle. The mirror is in an apparatus that has an X-ray beam generator which emits an X-ray beam along a longitudinal geometrical axis, a table device arranged to support the layer, a diaphragm device of a material which absorbs X-rays, having an aperture which is in the longitudinal geometrical axis, and a light source which can be directed onto the region for the layer. The mirror is composed of glass and has a hole at 45.degree. to the plane of the mirror. The longitudinal geometrical axis of the X-ray beam passes through the hole.
Abstract:
The circuit arrangement generates square-wave signals whose recurrence frequency coincides with the recurrence frequency of input signals supplied to it and whose duty cycle is constant, irrespective of the recurrence frequency. The circuit arrangement contains a flip-flop set by each input signal and reset by reset signals. The square-wave signals are emitted at the output of the flip-flop. A first integrator circuit of relatively great time constant is discharged or charged when the flip-flop is set or reset, respectively. Another integrator circuit is charged whenever the flip-flop is set. The instantaneous voltages at outputs of integrator circuits are compared with each other, and when they are the same the comparator generates the reset signal. In addition, the second integrator circuit is discharged, and renewed charging is prevented as long as the flip-flop is reset.
Abstract:
An electro-magnetic thickness measuring probe has a pot core which has a central bore, a pot chamber coaxial to the central bore accommodating a winding, and a pot rim. A pole-piece has one end fixed into the central bore and a free front-face with a coaxial recess machined therein such that an outer shell remains around the recess. A hard-metal pin is seated in the recess and has a front-face forming a crowned contact surface which stands a little proud of the pot rim. A coaxial annular disk made of highly permeable magnetic material has an outer edge in contact with the pot rim, a non-magnetic slot, and an intrados-radius surface having a diameter greater than the diameter of the pole-piece but significantly smaller than the diameter of the pot chamber. The intrados-radius surface lies close to the front-face of the pole-piece, whereby the magnetic resistance between the intrados-radius surface and the outer shell is significantly greater than the magnetic resistance between the intrados-radius surface and the free front-face when the measuring probe is set down on a surface.
Abstract:
The apparatus measures the thickness of thin layers according to the X-ray fluorescence principle. It has an X-ray beam generator which emits an X-ray beam along a longitudinal geometrical axis, a table device arranged to support a layer which is to be measured, a diaphragm device of a material which absorbs X-rays completely, having a through-aperture which is moveable into the longitudinal geometrical axis, a light source for visible light which can be directed onto the region for the layer, a monocular microscope arrangement for viewing the region of the layer on which the X-ray beam falls, and a deflecting mirror in the optical path between the monocular microscope arrangement and the region of the layer. The diaphragm device is composed of a glass which is transparent to visible light, and has several through-bores therein of different cross-sectional geometry. Means are provided for guiding the diaphragm device in a manner such that one of the through-bores can be at all times, in line with the longitudinal geometrical axis of the X-ray beam. The deflecting mirror is composed of a material which, in practical terms, does not absorb X-rays, and the longitudinal geometrical axis of the X-ray beam passes through it. The monocular microscope arrangement forms sharp images of both the diaphragm device and the region of the layer. An aiming device is provided in the monocular microscope arrangement, having an aiming point intersecting the longitudinal geometrical axis of the X-ray beam, in the optical-path direction, at the point where the longitudinal geometrical axis of the X-ray beam passes through the deflecting mirror.
Abstract:
An empty belt clip and empty cartridge casing discharge arrangement for use with a machine cannon which can, for example, be mounted in the gun turret of an armored vehicle. The arrangement includes a cradle and built-in gun barrel which is pivotally mounted in a gun mount about an axis which is parallel to the longitudinal axis of the gun barrel for control purposes. An alternate ammunition belt feeder is also pivotally mounted in the gun mount about a second axis which is also parallel to the longitudinal axis of the gun barrel and is adapted to assume an upper or lower operative position or a middle SAFETY position. The alternate ammunition belt feeder has an upper and lower outlet for empty belt clips. An upper and lower discharge duct are mounted in the arrangement so that their respective inlets confront the upper and lower outlets of the alternate ammunition belt feeder. A middle duct serves to receive the empty cartridge casings from the cradle. Means are respectively mounted in the inlet regions of the upper and lower discharge ducts to be actuated by the empty belt clips which are being discharged in dependence to the positional shift of the alternate ammunition belt feeder.